Re: [Neo4j] Neo4j-Scala Wrapper 0.1.0 released
I've made an dirty hack how a traversal (query) DSL could look like in Scala. I pushed the code to herehttps://github.com/FaKod/neo4j-scala/blob/ScalaTraverserHack/examples/eu/fakod/examples/TheMatrixTraversalHack.scala . The query uses a collections of nodes (nodeMap is a HashMap mapping Strings to Node instances): val startNodes = nodeMap(Neo) :: nodeMap(Morpheus) :: nodeMap(Trinity) :: Nil The Traverser can be started by calling method start on this list of nodes: startNodes.start[Matrix](_.name.length 3)(--(CODED_BY) -- (KNOWS) --) - start takes type parameters. In This case its the case class Matrix(defined by case class Matrix(name: String, profession: String)) used while creating the nodes (a neo4j-scala feature). - The Term (_.name.length 3) is basically the returnable evaluator, which dereferences the name parameter of the Matrix instance and checks its length. - The Term (--(CODED_BY) -- (KNOWS) --) evaluates to the relationship type and direction array (as parameterlist to call method traverse) The return of the call is a List of Matrix instances. Its possible to use Scala collection API to apply operations on this. Like sorting: startNodes.start[Matrix](_.name.length 3)(--(CODED_BY) -- (KNOWS) --) sortWith (_.name _.name) The length of all names: startNodes.start[Matrix](_.name.length 3)(--(KNOWS) --).map(_.name).foldLeft(0)(_ + _.length) Append all names: startNodes.start[Matrix](_.name.length 3)(--(CODED_BY) -- (KNOWS) --).map(_.name).foldLeft()(_ + _) The Output of the Github examples herehttps://github.com/FaKod/neo4j-scala/blob/ScalaTraverserHack/examples/eu/fakod/examples/TheMatrixTraversalHack.scalais: Relations CODED_BY and KNOWS, sorted by name: List(Matrix(Agent Smith,Program), Matrix(Cypher,Hacker), Matrix(Morpheus,Hacker), Matrix(The Architect,Whatever), Matrix(Trinity,Hacker)) Relations KNOWS, length of all names: 32 Relations CODED_BY and KNOWS, all names appended: TrinityMorpheusCypherAgent SmithThe Architect This is really a hack. It should be possible to get rid most of the relation parentheses and to run the traverser multithreaded automatically for every node. I hope this is helpful :-) Christopher On Fri, Nov 18, 2011 at 3:16 PM, Christopher Schmidt fakod...@googlemail.com wrote: Hi Andres, worries is the wrong term. I think a query language has its use case and its absolutely necessary for Neo4j. It maps common use cases to a powerful language. But using it programmatically is something different. Thats what I mean with abstraction (in the sense of software development). It is a different language, with a different semantic used in a compiled language (Java or Scala); and this is not a natural fit. Do I have something in mind: No - no concrete examples. But obviously the traverser api with return and stop evaluators is too generic (together with the lack of common result list operations, like sort, filter etc). In case of Scala it should be possible (using the powerful collection api) to create a DSL for complex queries and aggregation of results (that is able to support multi core processing as well, which is a important feature imho). I will try to invest some time. Maybe I can get to an example... On Thu, Nov 17, 2011 at 2:44 PM, Andres Taylor andres.tay...@neotechnology.com wrote: On Thu, Nov 17, 2011 at 1:21 PM, Christopher Schmidt fakod...@googlemail.com wrote: Cypher has some similarities to SQL as a special query language. And to be honest, I think using it programmatically will cause the same symtoms as SQL with respect to runtime errors, type safety, abstraction etc. I understand your worries about runtime errors and type safety. I'd love to know what you mean by abstraction etc. Do you have any concrete examples in mind? Andrés ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Christopher twitter: @fakod blog: http://blog.fakod.eu -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Neo4j-Scala Wrapper 0.1.0 released
Peter, I think its not possible because [ and ] are reserved for Scalas
type declarations.
The String (fe. KNOWS) is implicitly converted
into DynamicRelationshipType.withName(KNOWS).
What would be possible to get something like this (which is actually just a
change of method names):
start - KNOWS - end
Regarding the Cypher language:
Its an interpreted language, so it is possible to define a completely free
syntax. In case of Scala, all we are doing has to be fit into the language
syntax, although it looks like a freely designed DSL. Cypher has some
similarities to SQL as a special query language. And to be honest, I think
using it programmatically will cause the same symtoms as SQL with respect
to runtime errors, type safety, abstraction etc.
Nevertheless, it would be interesting to create a nearly Cypher compilable
DSL, which includes type safety and transparent DAO or Case Class mapping.
Something like:
case class User(name:String)
val nodes = createNode(User(name1)) :: createNode(User(name2))
:: createNode(User(name3)) :: Nil
. . .
for (f - START nodes MATCH user-friend-follower WHERE follower.name =~
/S.*/ RETURN follower)
println(User Follower: + f.name)
This would be basically the same idea JPA tries with its criteria api. But
that will be hard work :-)
Christopher
On Wednesday, November 16, 2011, Peter Neubauer wrote:
Chstopher,
this looks really cool! I notice the similarity to the cypher syntax
in the ASCII art part of the notation. Do you think there is a chance
to make it even more similar to that so you could actually write
start -[:KNOWS]- intermediary - [KNOWS] - end
instead of
start -- KNOWS -- intermediary -- KNOWS -- end ? Would be
quite cool to be closely in line with
http://docs.neo4j.org/chunked/snapshot/cypher-query-lang.html, maybe
we could even use this for a modifying cypher in the future ...
Cheers,
/peter neubauer
GTalk: neubauer.peter
Skype peter.neubauer
Phone +46 704 106975
LinkedIn http://www.linkedin.com/in/neubauer
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http://www.neo4j.org - NOSQL for the Enterprise.
http://startupbootcamp.org/- Öresund - Innovation happens HERE.
On Wed, Nov 16, 2011 at 6:36 AM, Christopher Schmidt
fakod...@googlemail.com wrote:
Hi all,
I released version 0.1.0 of the Neo4j Scala Wrapper neo4j-scala (base is
neo4j-scala by jawher).
Main features are
- simple Traits for the wrapper itself, GraphDatabaseService provider,
index provider and batch insertion
- transaction wrapping:
withTx {...}
- natural usage of relations:
start -- KNOWS -- intermediary -- KNOWS -- end
- setting and getting properties:
node(foo) = bar
node[String](foo) match {
case Some(x) = println(x)
case None = println(aww)
}
- easy CaseClass to/from Node/Relation properties marshaling
withTx {
implicit neo =
// create new Node with Case Class Test
val node1 = createNode(Test(Something, 1, 2, 3.3, 10, true))
// or using Option[T] (returning Some[T] if possible)
val nodeOption: Option[Test] = node.toCC[Test]
// create new relation with Case Class Test
node1 -- foo -- node2 Test(other, 0, 1, 1.3, 1, false)
}
- transparent batch processing (simply replace 2 traits to use the same
code for batch- and non batch processing)
For now I am using a simple Github Maven repository.
Neo4j-scala should be usable with the following POM settings:
repositories
repository
idfakod-releases/id
urlhttps://raw.github.com/FaKod/fakod-mvn-repo/master/releases
/url
/repository
/repositories
dependencies
dependency
groupIdorg.neo4j/groupId
artifactIdneo4j-scala/artifactId
version0.1.0/version
/dependency
/dependencies
The Sources are hosted on Github:
https://github.com/FaKod/neo4j-scala/tree/0.1.0
A simple Matrix example GIST is here:
https://gist.github.com/1331556
Enjoy...
PS: Maybe you are using Neo4j Server via Jersey? So sjersey-client may be
interesting for you as well: see @
Githubhttps://github.com/FaKod/sjersey-client/tree/0.1.0 and
this example https://gist.github.com/1366334.
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
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--
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blog: http://blog.fakod.eu
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[Neo4j] Neo4j-Scala Wrapper 0.1.0 released
Hi all,
I released version 0.1.0 of the Neo4j Scala Wrapper neo4j-scala (base is
neo4j-scala by jawher).
Main features are
- simple Traits for the wrapper itself, GraphDatabaseService provider,
index provider and batch insertion
- transaction wrapping:
withTx {...}
- natural usage of relations:
start -- KNOWS -- intermediary -- KNOWS -- end
- setting and getting properties:
node(foo) = bar
node[String](foo) match {
case Some(x) = println(x)
case None = println(aww)
}
- easy CaseClass to/from Node/Relation properties marshaling
withTx {
implicit neo =
// create new Node with Case Class Test
val node1 = createNode(Test(Something, 1, 2, 3.3, 10, true))
// or using Option[T] (returning Some[T] if possible)
val nodeOption: Option[Test] = node.toCC[Test]
// create new relation with Case Class Test
node1 -- foo -- node2 Test(other, 0, 1, 1.3, 1, false)
}
- transparent batch processing (simply replace 2 traits to use the same
code for batch- and non batch processing)
For now I am using a simple Github Maven repository.
Neo4j-scala should be usable with the following POM settings:
repositories
repository
idfakod-releases/id
urlhttps://raw.github.com/FaKod/fakod-mvn-repo/master/releases
/url
/repository
/repositories
dependencies
dependency
groupIdorg.neo4j/groupId
artifactIdneo4j-scala/artifactId
version0.1.0/version
/dependency
/dependencies
The Sources are hosted on Github:
https://github.com/FaKod/neo4j-scala/tree/0.1.0
A simple Matrix example GIST is here:
https://gist.github.com/1331556
Enjoy...
PS: Maybe you are using Neo4j Server via Jersey? So sjersey-client may be
interesting for you as well: see @
Githubhttps://github.com/FaKod/sjersey-client/tree/0.1.0 and
this example https://gist.github.com/1366334.
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
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Re: [Neo4j] Batch Inserter, Node Property error
Send a pull request (https://github.com/neo4j/community/pull/73)
On Mon, Oct 24, 2011 at 6:38 AM, Christopher Schmidt
fakod...@googlemail.com wrote:
Hi all,
I am writing a Scala wrapper for the batch insertion interfaces. While
doing so, I have the problem that properties are not written to DB.
I wrote a little test case for Java, same error. The code below prints out:
2 has property keys [2, 1]
2 has property keys []
Am I doing something wrong?
Regards Christopher
PS: Neo4j version 1.5-SNAPSHOT
public class JavaMain {
public static void main(String[] args) {
String path = /tmp/temp-neo-batch-test;
BatchInserter inserter = new BatchInserterImpl(path);
BatchInserterIndexProvider provider = new
LuceneBatchInserterIndexProvider(inserter);
String name = users;
BatchInserterIndex index = provider.nodeIndex(name,
LuceneIndexImplementation.EXACT_CONFIG);
GraphDatabaseService gds = inserter.getGraphDbService();
Node myNode = gds.createNode();
long id = myNode.getId();
myNode.setProperty(1, one);
myNode.setProperty(2, two);
index.flush();
System.out.println(myNode.getId() + has property keys +
myNode.getPropertyKeys());
provider.shutdown();
inserter.shutdown();
GraphDatabaseService db = new EmbeddedGraphDatabase(path);
Node node1 = db.getNodeById(id);
System.out.println(node1.getId() + has property keys +
node1.getPropertyKeys());
db.shutdown();
}
}
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
--
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twitter: @fakod
blog: http://blog.fakod.eu
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[Neo4j] Batch Inserter, Node Property error
Hi all,
I am writing a Scala wrapper for the batch insertion interfaces. While doing
so, I have the problem that properties are not written to DB.
I wrote a little test case for Java, same error. The code below prints out:
2 has property keys [2, 1]
2 has property keys []
Am I doing something wrong?
Regards Christopher
PS: Neo4j version 1.5-SNAPSHOT
public class JavaMain {
public static void main(String[] args) {
String path = /tmp/temp-neo-batch-test;
BatchInserter inserter = new BatchInserterImpl(path);
BatchInserterIndexProvider provider = new
LuceneBatchInserterIndexProvider(inserter);
String name = users;
BatchInserterIndex index = provider.nodeIndex(name,
LuceneIndexImplementation.EXACT_CONFIG);
GraphDatabaseService gds = inserter.getGraphDbService();
Node myNode = gds.createNode();
long id = myNode.getId();
myNode.setProperty(1, one);
myNode.setProperty(2, two);
index.flush();
System.out.println(myNode.getId() + has property keys +
myNode.getPropertyKeys());
provider.shutdown();
inserter.shutdown();
GraphDatabaseService db = new EmbeddedGraphDatabase(path);
Node node1 = db.getNodeById(id);
System.out.println(node1.getId() + has property keys +
node1.getPropertyKeys());
db.shutdown();
}
}
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
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Re: [Neo4j] neo4j-scala improvements
Hi Peter, I updated both pom.xml to use Neo4j 1.5-SNAPSHOT Let me know if I can help. Christopher On Tue, Sep 27, 2011 at 2:11 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Building it right now ... Maybe we can set it up against Neo4j 1.5-SNAPSHOT and put it on our build server to start with? Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/- Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Wed, Sep 21, 2011 at 4:29 PM, Christopher Schmidt fakod...@googlemail.com wrote: Hi all I did... - Split it up to Neo4j Scala, which is mainly the old available neo4j-scala version. A little refactored and enhanced with Case Class to Node properties marshaling and some Traits for graph service provider handling (- https://github.com/FaKod/neo4j-scala) - Neo4j Spatial Scala with some spatial convenience methods (- https://github.com/FaKod/neo4j-spatial-scala) - I updated both READMEs to reflect the current state - lowered both version numbers to 0.1.0-SNAPSHOT (the old where 0.9.9... too high I think) - Updated Scala to 2.9.1 and Neo4j to the last available Neo4j Spatial compatible version (1.4.1) - started to add some more Specs2 test cases (still far away from enough) Should be a good starting point for playing, testing and discussing various design and DSL decisions :-) Cheers Christopher On Mon, Sep 12, 2011 at 9:17 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Awesome Christopher, let us know when things are stabilizing, so we can start to put the scala bindings onto the build server and run regular tests against Neo4j master! Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/- Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Mon, Sep 12, 2011 at 9:03 PM, Christopher Schmidt fakod...@googlemail.com wrote: OK. I will - use my forked neo4j-scala repository for the Neo4j part - push the spatial part into my neo4j-spatial-scala repository which will have a dependancy to neo4j-scala. On Mon, Sep 12, 2011 at 9:58 AM, Anders Nawroth and...@neotechnology.comwrote: Hi! So far Neo4j and Neo4j Spatial don't share the same release cycle, so it makes sense to split the scala wrapper in two projects. /anders On 09/12/2011 06:14 AM, Christopher Schmidt wrote: Yes - thats possible. I think to have a repo would ease the usage of neo4j-scala. The next days (hope there is enough time) I will clean up and document the sources so that they are easier to understand. Next would be to update to the current versions of Neo4j, Neo4j Spatial and Scala. Actual, neo4j-scala includes the spatial wrapper as well, do you think it is necessary to split it into two projects (neo4j-scala and neo4j-spatial-scala)? On Fri, Sep 9, 2011 at 3:21 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Very cool Christopher! We are testing to pull in some of the bindings for Neo4j into the manual - would it be possible, when things stabilize, to pull in the Scala bindings to the Neo4j repo. build them and start documenting some test cases so we can put them into there, too? Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/- Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Fri, Sep 9, 2011 at 8:10 AM, Christopher Schmidt fakod...@googlemail.com wrote: Neo4j Scala (https://github.com/FaKod/neo4j-scala) has got some improvements - Scala (non nested) Case Class de- serialization to or from a Neo4j Node (see example) - index convenience methods (see example) - create and get Relation Objects, like val relation = start -- foo -- end; It's still alpha, but worth to look at :-) case class Test(s: String, i: Int, ji: java.lang.Integer, d: Double, l: Long, b: Boolean) object
Re: [Neo4j] neo4j-scala improvements
Hi all
I did...
- Split it up to Neo4j Scala, which is mainly the old available neo4j-scala
version. A little refactored and enhanced with Case Class to Node
properties marshaling and some Traits for graph service provider handling
(- https://github.com/FaKod/neo4j-scala)
- Neo4j Spatial Scala with some spatial convenience methods (-
https://github.com/FaKod/neo4j-spatial-scala)
- I updated both READMEs to reflect the current state
- lowered both version numbers to 0.1.0-SNAPSHOT (the old where 0.9.9... too
high I think)
- Updated Scala to 2.9.1 and Neo4j to the last available Neo4j Spatial
compatible version (1.4.1)
- started to add some more Specs2 test cases (still far away from enough)
Should be a good starting point for playing, testing and discussing various
design and DSL decisions :-)
Cheers Christopher
On Mon, Sep 12, 2011 at 9:17 PM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Awesome Christopher,
let us know when things are stabilizing, so we can start to put the
scala bindings onto the build server and run regular tests against
Neo4j master!
Cheers,
/peter neubauer
GTalk: neubauer.peter
Skype peter.neubauer
Phone +46 704 106975
LinkedIn http://www.linkedin.com/in/neubauer
Twitter http://twitter.com/peterneubauer
http://www.neo4j.org - Your high performance graph database.
http://startupbootcamp.org/- Öresund - Innovation happens HERE.
http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
On Mon, Sep 12, 2011 at 9:03 PM, Christopher Schmidt
fakod...@googlemail.com wrote:
OK. I will
- use my forked neo4j-scala repository for the Neo4j part
- push the spatial part into my neo4j-spatial-scala repository which will
have a dependancy to neo4j-scala.
On Mon, Sep 12, 2011 at 9:58 AM, Anders Nawroth
and...@neotechnology.comwrote:
Hi!
So far Neo4j and Neo4j Spatial don't share the same release cycle, so it
makes sense to split the scala wrapper in two projects.
/anders
On 09/12/2011 06:14 AM, Christopher Schmidt wrote:
Yes - thats possible. I think to have a repo would ease the usage of
neo4j-scala.
The next days (hope there is enough time) I will clean up and document
the
sources so that they are easier to understand.
Next would be to update to the current versions of Neo4j, Neo4j
Spatial
and
Scala.
Actual, neo4j-scala includes the spatial wrapper as well, do you think
it
is necessary to split it into two projects (neo4j-scala and
neo4j-spatial-scala)?
On Fri, Sep 9, 2011 at 3:21 PM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Very cool Christopher!
We are testing to pull in some of the bindings for Neo4j into the
manual - would it be possible, when things stabilize, to pull in the
Scala bindings to the Neo4j repo. build them and start documenting
some test cases so we can put them into there, too?
Cheers,
/peter neubauer
GTalk: neubauer.peter
Skype peter.neubauer
Phone +46 704 106975
LinkedIn http://www.linkedin.com/in/neubauer
Twitter http://twitter.com/peterneubauer
http://www.neo4j.org - Your high performance graph
database.
http://startupbootcamp.org/- Öresund - Innovation happens HERE.
http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing
party.
On Fri, Sep 9, 2011 at 8:10 AM, Christopher Schmidt
fakod...@googlemail.com wrote:
Neo4j Scala (https://github.com/FaKod/neo4j-scala) has got some
improvements
- Scala (non nested) Case Class de- serialization to or from a Neo4j
Node
(see example)
- index convenience methods (see example)
- create and get Relation Objects, like val relation = start --
foo
--
end;
It's still alpha, but worth to look at :-)
case class Test(s: String, i: Int, ji: java.lang.Integer, d: Double,
l:
Long, b: Boolean)
object DeSerializingSpec extends Specification with Neo4jWrapper
with
EmbeddedGraphDatabaseServiceProvider {
def neo4jStoreDir = /tmp/temp-neo-test
Node should {
be serializable in {
var o = Test(This is a String, 1, 2, 3.3, 10, true)
var node: Node = null
withTx {
implicit neo =
node = createNode(o)
}
var oo = deSerialize[Test](node)
oo must beEqual(o)
}
}
}
object IndexTestSpec extends Specification with Neo4jWrapper with
EmbeddedGraphDatabaseServiceProvider with Neo4jIndexProvider {
def neo4jStoreDir = /tmp/temp-neo-index-test
override def NodeIndexConfig = (MyTestIndex, Map(provider -
lucene,
type - fulltext)) :: Nil
Neo4jIndexProvider should {
use the fulltext search index in {
val nodeIndex = getNodeIndex(MyTestIndex).get
withSpatialTx {
implicit db =
val theMatrix
Re: [Neo4j] neo4j-scala improvements
OK. I will
- use my forked neo4j-scala repository for the Neo4j part
- push the spatial part into my neo4j-spatial-scala repository which will
have a dependancy to neo4j-scala.
On Mon, Sep 12, 2011 at 9:58 AM, Anders Nawroth and...@neotechnology.comwrote:
Hi!
So far Neo4j and Neo4j Spatial don't share the same release cycle, so it
makes sense to split the scala wrapper in two projects.
/anders
On 09/12/2011 06:14 AM, Christopher Schmidt wrote:
Yes - thats possible. I think to have a repo would ease the usage of
neo4j-scala.
The next days (hope there is enough time) I will clean up and document
the
sources so that they are easier to understand.
Next would be to update to the current versions of Neo4j, Neo4j Spatial
and
Scala.
Actual, neo4j-scala includes the spatial wrapper as well, do you think it
is necessary to split it into two projects (neo4j-scala and
neo4j-spatial-scala)?
On Fri, Sep 9, 2011 at 3:21 PM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Very cool Christopher!
We are testing to pull in some of the bindings for Neo4j into the
manual - would it be possible, when things stabilize, to pull in the
Scala bindings to the Neo4j repo. build them and start documenting
some test cases so we can put them into there, too?
Cheers,
/peter neubauer
GTalk: neubauer.peter
Skype peter.neubauer
Phone +46 704 106975
LinkedIn http://www.linkedin.com/in/neubauer
Twitter http://twitter.com/peterneubauer
http://www.neo4j.org - Your high performance graph
database.
http://startupbootcamp.org/- Öresund - Innovation happens HERE.
http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
On Fri, Sep 9, 2011 at 8:10 AM, Christopher Schmidt
fakod...@googlemail.com wrote:
Neo4j Scala (https://github.com/FaKod/neo4j-scala) has got some
improvements
- Scala (non nested) Case Class de- serialization to or from a Neo4j
Node
(see example)
- index convenience methods (see example)
- create and get Relation Objects, like val relation = start -- foo
--
end;
It's still alpha, but worth to look at :-)
case class Test(s: String, i: Int, ji: java.lang.Integer, d: Double, l:
Long, b: Boolean)
object DeSerializingSpec extends Specification with Neo4jWrapper with
EmbeddedGraphDatabaseServiceProvider {
def neo4jStoreDir = /tmp/temp-neo-test
Node should {
be serializable in {
var o = Test(This is a String, 1, 2, 3.3, 10, true)
var node: Node = null
withTx {
implicit neo =
node = createNode(o)
}
var oo = deSerialize[Test](node)
oo must beEqual(o)
}
}
}
object IndexTestSpec extends Specification with Neo4jWrapper with
EmbeddedGraphDatabaseServiceProvider with Neo4jIndexProvider {
def neo4jStoreDir = /tmp/temp-neo-index-test
override def NodeIndexConfig = (MyTestIndex, Map(provider -
lucene,
type - fulltext)) :: Nil
Neo4jIndexProvider should {
use the fulltext search index in {
val nodeIndex = getNodeIndex(MyTestIndex).get
withSpatialTx {
implicit db =
val theMatrix = createNode
val theMatrixReloaded = createNode
// add to index
nodeIndex += (theMatrix, title, The Matrix)
nodeIndex += (theMatrixReloaded, title, The Matrix
Reloaded)
val found = nodeIndex.query(title, reloAdEd)
found.size must beGreaterThanOrEqualTo(1)
// remove from index
nodeIndex -= theMatrix
nodeIndex -= theMatrixReloaded
}
}
}
}
--
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Re: [Neo4j] neo4j-scala improvements
Yes - thats possible. I think to have a repo would ease the usage of
neo4j-scala.
The next days (hope there is enough time) I will clean up and document the
sources so that they are easier to understand.
Next would be to update to the current versions of Neo4j, Neo4j Spatial and
Scala.
Actual, neo4j-scala includes the spatial wrapper as well, do you think it
is necessary to split it into two projects (neo4j-scala and
neo4j-spatial-scala)?
On Fri, Sep 9, 2011 at 3:21 PM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Very cool Christopher!
We are testing to pull in some of the bindings for Neo4j into the
manual - would it be possible, when things stabilize, to pull in the
Scala bindings to the Neo4j repo. build them and start documenting
some test cases so we can put them into there, too?
Cheers,
/peter neubauer
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On Fri, Sep 9, 2011 at 8:10 AM, Christopher Schmidt
fakod...@googlemail.com wrote:
Neo4j Scala (https://github.com/FaKod/neo4j-scala) has got some
improvements
- Scala (non nested) Case Class de- serialization to or from a Neo4j Node
(see example)
- index convenience methods (see example)
- create and get Relation Objects, like val relation = start -- foo
--
end ;
It's still alpha, but worth to look at :-)
case class Test(s: String, i: Int, ji: java.lang.Integer, d: Double, l:
Long, b: Boolean)
object DeSerializingSpec extends Specification with Neo4jWrapper with
EmbeddedGraphDatabaseServiceProvider {
def neo4jStoreDir = /tmp/temp-neo-test
Node should {
be serializable in {
var o = Test(This is a String, 1, 2, 3.3, 10, true)
var node: Node = null
withTx {
implicit neo =
node = createNode(o)
}
var oo = deSerialize[Test](node)
oo must beEqual(o)
}
}
}
object IndexTestSpec extends Specification with Neo4jWrapper with
EmbeddedGraphDatabaseServiceProvider with Neo4jIndexProvider {
def neo4jStoreDir = /tmp/temp-neo-index-test
override def NodeIndexConfig = (MyTestIndex, Map(provider -
lucene,
type - fulltext)) :: Nil
Neo4jIndexProvider should {
use the fulltext search index in {
val nodeIndex = getNodeIndex(MyTestIndex).get
withSpatialTx {
implicit db =
val theMatrix = createNode
val theMatrixReloaded = createNode
// add to index
nodeIndex += (theMatrix, title, The Matrix)
nodeIndex += (theMatrixReloaded, title, The Matrix Reloaded)
val found = nodeIndex.query(title, reloAdEd)
found.size must beGreaterThanOrEqualTo(1)
// remove from index
nodeIndex -= theMatrix
nodeIndex -= theMatrixReloaded
}
}
}
}
--
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[Neo4j] Java PaaS with Neo4j (slightly off topic)
Hi all, I am using (the embedded version of) Neo4j together with a webapplication (WAR file for Tomcat). Does anyone know a PaaS provider (like CloudBees) that allow a local file storage? (This would be a simple solution beside implementing the Neo4j Server REST interface and f.e. using a Neo4j Heroku Addon) -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Neo4j Spatial and gtype property
Hi all, is it allowed to use the gtype-property to get the geometry type numbers? (Which are defined in org.neo4j.gis.spatial.Constants) -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j Spatial and gtype property
So best is to use SpatialDatabaseRecord.getGeometry()? Christopher On Wed, Jul 27, 2011 at 10:50 PM, Craig Taverner cr...@amanzi.com wrote: Actually we do allow multiple geometry types in the same layer, but some actions, like export to shapely, will fail. We even test for this in TestDynamicLayers. You can use the gtype if you want, but it is specific to some GeometryEncoders, and might change in future releases. It would be better to get the layers geometry encoder and use that. On Jul 27, 2011 6:04 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Christopher, What do you mean by allowing to use? Yes, these properties are used to store the Geometry Type for a Layer and for geometry nodes. Sadly, you cannot have more than one Geometry in Layers due to the limitations of e.g. the GeoTools stack. Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://startupbootcamp.org/- Öresund - Innovation happens HERE. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Wed, Jul 27, 2011 at 4:07 AM, Christopher Schmidt fakod...@googlemail.com wrote: Hi all, is it allowed to use the gtype-property to get the geometry type numbers? (Which are defined in org.neo4j.gis.spatial.Constants) -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] neo4j-spatial roadmap/stability
Hi Neo4j... I am working for the largest German speaking travel and holiday portal. Currently we are using a relatively simple MySQL based spatial distance functionality. We plan to enhance this by something which is capable of a flexible set of spatial queries. We will evaluate Neo4j-Spatial for that and benchmark it against PostGIS/PostGreSQL. I found some Roadmap descriptions in the Neo4j Wiki ( http://wiki.neo4j.org/content/Neo4j_Spatial_Project_Plan), but I am not sure that these are still valid. Craig said (somewhere) that Neo4j Spatial is still alpha (I hope that this means that only the interfaces are still unstable). And I know that neo4j-spatial is an open source project where there is no Neo Technology responsibility. Can you drop a few words about the Spatial roadmap, its stability and planned licensing (all based on using it on a high volume web site)? Thanks -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Lake Constance Hackathon (South of Germany)
Hi all, we will do a Hackathon in Friedrichshafen and we have some ideas for Neo4j projects as well (see http://lcgtug.mixxt.de/networks/wiki/index.graphdb_project_proposals). So who ever is located at Lake Constance in Germany and is interested in Neo4j (-Spatial) is invited to attend :-) More Infos are here: http://lcgtug.mixxt.de/ -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] free slides for Neo4j Introduction
Thx Jim, it's good to see that there is a free tutorial available. Hopefully the next step we'll take... Christopher On Thu, Apr 28, 2011 at 12:48 AM, Jim Webber j...@neotechnology.com wrote: Hi Chris, The Neo4j tutorial that Ian Robinson and I are working on has a (PowerPoint) slide deck associated with it. See: https://github.com/jimwebber/neo4j-tutorial Jim ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Neo4j/Spatial and Scala
Hi all,
I am evaluating the advantages of using Neo4j and its spatial extension. For
testing I have extended (forked) the neo4j-scala with some spatial
convenience methods. So that something written in Java like:
SpatialDatabaseService db = new SpatialDatabaseService( graphDb() );
EditableLayer layer = (EditableLayer) db.getOrCreateEditableLayer( test );
SpatialDatabaseRecord record = layer.add(
layer.getGeometryFactory().createPoint(new Coordinate( 15.3, 56.2 ) ) );
Will be converted to:
class Neo4jTest extends Neo4jSpatialWrapper with
EmbeddedGraphDatabaseServiceProvider with SpatialDatabaseServiceProvider {
def neo4jStoreDir = NEO4J_STORE_DIR
withLayer(getOrCreateEditableLayer(test)) {
implicit layer =
val myRecord = add newPoint ((15.3, 56.2))
}
}
Please refer the github (https://github.com/FaKod/neo4j-scala) Readme or the
test cases for more examples .
Since we will try (if we have enough time) to extend Neo4j Scala, I would
love to get some comments from some of the Scala enthusiasts in this list
(hope there are any ;-). Now or later, here or to my email adress.
What do you think? Does it help? Is it OK how we use the Traits or
the implicits? How should we do POPO to Node serialization? With annotations
like those in jo4neo?
Regards
--
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[Neo4j] 1.3.M03 version conflict?
Hi, I am playing with Neo4j Spatial and Neo4j for Scala with the following versions (using Maven): scala.version2.8.1/scala.version neo4j.version1.3.M03/neo4j.version neo4j.shell.version1.1/neo4j.shell.version neo4j.spatial.version0.5-SNAPSHOT/neo4j.spatial.version Running the tests I get the following exception Caused by: java.lang.NoSuchMethodError: org.neo4j.kernel.impl.transaction.xaframework.XaContainer.create(Ljava/lang/String;Lorg/neo4j/kernel/impl/transaction/xaframework/XaCommandFactory;Lorg/neo4j/kernel/impl/transaction/xaframework/XaTransactionFactory;Ljava/util/Map;)Lorg/neo4j/kernel/impl/transaction/xaframework/XaContainer; at org.neo4j.index.lucene.LuceneDataSource.init(LuceneDataSource.java:126) The pom I am using is here: https://github.com/FaKod/neo4j-scala/blob/master/pom.xml Seems to be a version conflict. Is it my fault? Thanks -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] 1.3.M03 version conflict?
Yes - I overlooked that there is a shell version 1.3.M03. Thanks :-) On Tue, Mar 15, 2011 at 6:45 PM, Anders Nawroth and...@neotechnology.comwrote: Hi! It's the shell version, it should be 1.3.M03. /anders 2011-03-15 18:13, Christopher Schmidt skrev: Hi, I am playing with Neo4j Spatial and Neo4j for Scala with the following versions (using Maven): scala.version2.8.1/scala.version neo4j.version1.3.M03/neo4j.version neo4j.shell.version1.1/neo4j.shell.version neo4j.spatial.version0.5-SNAPSHOT/neo4j.spatial.version Running the tests I get the following exception Caused by: java.lang.NoSuchMethodError: org.neo4j.kernel.impl.transaction.xaframework.XaContainer.create(Ljava/lang/String;Lorg/neo4j/kernel/impl/transaction/xaframework/XaCommandFactory;Lorg/neo4j/kernel/impl/transaction/xaframework/XaTransactionFactory;Ljava/util/Map;)Lorg/neo4j/kernel/impl/transaction/xaframework/XaContainer; at org.neo4j.index.lucene.LuceneDataSource.init(LuceneDataSource.java:126) The pom I am using is here: https://github.com/FaKod/neo4j-scala/blob/master/pom.xml Seems to be a version conflict. Is it my fault? Thanks ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j REST API and JAXB
I see ...
You can use
val anyRef = /index/node.GET[AnyRef]
in this case anyRef.toString returns:
{index2={template=
http://localhost:7474/db/data/index/node/index2/{key}/{value},
provider=lucene, type=fulltext}, my_nodes={template=
http://localhost:7474/db/data/index/node/my_nodes/{key}/{value},
provider=lucene, type=exact}}
this is the most simple solution.
If you know some properties and want to ignore others, you can put
the JsonIgnoreProperties annotation to the class, like:
@JsonIgnoreProperties(ignoreUnknown = true)
case class GetIndex(@BeanProperty var my_nodes: MyNodes) {
def this() = this (null)
}
case class MyNodes(. . .)
This would simply ignore the index2 object.
I will check that in to github.
However, the best thing would be to be as predictable as possible, f.e using
an anonymous array:
[
{
name : index2,
template :
http://localhost:7474/db/data/index/node/index2/{key}/{value};,
provider : lucene,
type : fulltext
},
{
name : my_nodes,
template :
http://localhost:7474/db/data/index/node/my_nodes/{key}/{value};,
provider : lucene,
type : exact
}
]
Something like that...
Christopher
On Sat, Jan 1, 2011 at 11:01 PM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Yeah,
that sounds good. However, in the Index listing case, there is no
top-level key to pass into the class, sine alrady the root-level index
names are unpredictable. Is that possible to cover, too? In the
extensions case, there is at least the extensions handle to pass in,
even if we don't know the type of the value ...
Cheers,
/peter neubauer
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On Sat, Jan 1, 2011 at 10:57 PM, Christopher Schmidt
fakod...@googlemail.com wrote:
Same as GET http://localhost:7474/db/data/ where I can not predict the
extensions parameter. I used the simple data binding (see
herehttp://wiki.fasterxml.com/JacksonDataBinding).
Means that the parameter is of type Any
case class GetRoot( . . . @BeanProperty var extensions:Any) {
. . .
}
Jackson fills it with a LinkedHashMapString,Object. F.e. if the
returned
JSON is
{
. . .
extensions : {
GetAll : {
get_all_nodes :
http://localhost:7474/db/data/ext/GetAll/graphdb/get_all_nodes;,
getAllRelationships :
http://localhost:7474/db/data/ext/GetAll/graphdb/getAllRelationships;
}
}
}
the LinkedHashMap.toString prints:
{GetAll={get_all_nodes=
http://localhost:7474/db/data/ext/GetAll/graphdb/get_all_nodes,
getAllRelationships=
http://localhost:7474/db/data/ext/GetAll/graphdb/getAllRelationships}}
I don't know if there is a better way...
Christopher
On Sat, Jan 1, 2011 at 10:20 PM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Christopher,
my problem is with the names of the index representations being able
to contain whatever, so the Scala case class can't assume a parameter
name. look at the result of an index creation and listing:
curl -X POST -H Accept:application/json -HContent-Type:application/jon
-d '{name:index2,
config:{type:fulltext,provider:lucene}}'
http://localhost:7474/db/data/index/node
{
template :
http://localhost:7474/db/data/index/node/index2/{key}/{value};,
provider : lucene,
type : fulltext
}
$curl http://localhost:7474/db/data/index/node
{ index2 : {
template :
http://localhost:7474/db/data/index/node/index2/{key}/{value};,
provider : lucene,
type : fulltext
},
fulltext : {
template :
http://localhost:7474/db/data/index/node/fulltext/{key}/{value};,
provider : lucene,
type : fulltext
}
}
How do I code this to be a map of Index classes in SJersey?
Cheers,
/peter neubauer
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On Sat, Jan 1, 2011 at 8:43 PM, Christopher Schmidt
fakod...@googlemail.com wrote:
Happy new year Peter,
I did that already in my repo and added as well an example to use
polymorphic *node classes* (using Scala's case classes, see
here
https://github.com/FaKod/SJersey/blob/master/src/test/scala/org/sjersey/test/json/polymorphic/Animal.scala
).
Christopher
On Sat, Jan 1, 2011 at 9:59 AM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Christopher,
Happy New Year! I tried to fork and adapt the code to reflect the
updated
Re: [Neo4j] Neo4j REST API and JAXB
Happy new year Peter,
I did that already in my repo and added as well an example to use
polymorphic *node classes* (using Scala's case classes, see
herehttps://github.com/FaKod/SJersey/blob/master/src/test/scala/org/sjersey/test/json/polymorphic/Animal.scala
).
Christopher
On Sat, Jan 1, 2011 at 9:59 AM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Christopher,
Happy New Year! I tried to fork and adapt the code to reflect the
updated REST API, but the variable index listing under
/db/data/index/node is too hard for my Scala skillz ... Feel free to
pull, diff and correct :)
/Peter
On Wednesday, December 29, 2010, Christopher Schmidt
fakod...@googlemail.com wrote:
I am answering my own thread here, just in case someone is interested...
I solved my unmarshaling issue with Neo4j REST, JAXB and Jersey with
using
the Jackson JSON processor (http://jackson.codehaus.org/) instead of
Jersey
JSON.
This makes it easy to write a POPO representation of Neo4j's REST
*objects*.
I implemented some of them (in Scala), see here:
https://github.com/FaKod/SJersey/tree/master/src/test/scala/org/sjersey/test/json/neo4jstuff
The usage is rather simple. I tested it with a *specs* test class here:
https://github.com/FaKod/SJersey/blob/master/src/test/scala/org/sjersey/test/AccessTest.scala
Although some idea files are checked in, it should be able to check it
out
with maven2 (pom.xml).
I have written a blog post about this POC
here
http://blog.fakod.eu/2010/12/10/yet-another-trya-rest-client-with-jersey-and-scala/
,
as I said: Just in case someone is interested to use Scala, Jersey and
the
Neo4j REST server ;)
Christopher
On Wed, Dec 8, 2010 at 4:09 PM, Christopher Schmidt
fakod...@googlemail.com
wrote:
I have a little spare time ;-) and I try to create a/another very
smart
REST client DSL in Scala.
For testing and test data I am using the Neo4j Server from here:
http://blog.neo4j.org/2010/04/neo4j-rest-server-part1-get-it-going.html
Client library is Jersey, JSON marshaling and unmarshaling lib is JAXB.
The
current client Scala code is:
rest {
implicit s =
val traversalPath = node/3/traverse/path.POST[JSONArray] =
PathRequest(order = depth first, max_depth = 4, uniqueness = node
path)
println(Array length: + traversalPath.length) // prints 2
}
The above JSONArray works fine, but if I use Java objects
(as XmlRootElement) I get unmarshaling exceptions. It would be helpful
If
there is someone out there who already created some JAXB objects for
Neo4j...
Christopher
On Wed, Dec 8, 2010 at 3:56 PM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Christopher,
are you trying to build your own server, or are you using Neo4j Server?
The REST API is now part of the server component, we are right now
defining a mechanism to mount your own server extensions without
breaking the REST hypermedia of the existing API.
What are you trying to do?
Cheers,
/peter neubauer
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database.
http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing
party.
On Wed, Dec 8, 2010 at 3:52 PM, Christopher Schmidt
fakod...@googlemail.com wrote:
Hi all, is anyone using the REST interface and JAXB?
I have some problems with the traversal response of POST call to
/node/3/traverse/path which returns:
[ {
start : http://localhost:/node/3;,
nodes : [ http://localhost:/node/3;,
http://localhost:/node/1;
],
length : 1,
relationships : [ http://localhost:/relationship/6; ],
end : http://localhost:/node/1;
}, {
start : http://localhost:/node/3;,
nodes : [ http://localhost:/node/3;,
http://localhost:/node/2;
],
length : 1,
relationships : [ http://localhost:/relationship/2; ],
end : http://localhost:/node/2;
--
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Re: [Neo4j] Neo4j REST API and JAXB
Same as GET http://localhost:7474/db/data/ where I can not predict the
extensions parameter. I used the simple data binding (see
herehttp://wiki.fasterxml.com/JacksonDataBinding).
Means that the parameter is of type Any
case class GetRoot( . . . @BeanProperty var extensions:Any) {
. . .
}
Jackson fills it with a LinkedHashMapString,Object. F.e. if the returned
JSON is
{
. . .
extensions : {
GetAll : {
get_all_nodes :
http://localhost:7474/db/data/ext/GetAll/graphdb/get_all_nodes;,
getAllRelationships :
http://localhost:7474/db/data/ext/GetAll/graphdb/getAllRelationships;
}
}
}
the LinkedHashMap.toString prints:
{GetAll={get_all_nodes=
http://localhost:7474/db/data/ext/GetAll/graphdb/get_all_nodes,
getAllRelationships=
http://localhost:7474/db/data/ext/GetAll/graphdb/getAllRelationships}}
I don't know if there is a better way...
Christopher
On Sat, Jan 1, 2011 at 10:20 PM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Christopher,
my problem is with the names of the index representations being able
to contain whatever, so the Scala case class can't assume a parameter
name. look at the result of an index creation and listing:
curl -X POST -H Accept:application/json -HContent-Type:application/jon
-d '{name:index2,
config:{type:fulltext,provider:lucene}}'
http://localhost:7474/db/data/index/node
{
template :
http://localhost:7474/db/data/index/node/index2/{key}/{value};,
provider : lucene,
type : fulltext
}
$curl http://localhost:7474/db/data/index/node
{ index2 : {
template :
http://localhost:7474/db/data/index/node/index2/{key}/{value};,
provider : lucene,
type : fulltext
},
fulltext : {
template :
http://localhost:7474/db/data/index/node/fulltext/{key}/{value};,
provider : lucene,
type : fulltext
}
}
How do I code this to be a map of Index classes in SJersey?
Cheers,
/peter neubauer
GTalk: neubauer.peter
Skype peter.neubauer
Phone +46 704 106975
LinkedIn http://www.linkedin.com/in/neubauer
Twitter http://twitter.com/peterneubauer
http://www.neo4j.org - Your high performance graph database.
http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
On Sat, Jan 1, 2011 at 8:43 PM, Christopher Schmidt
fakod...@googlemail.com wrote:
Happy new year Peter,
I did that already in my repo and added as well an example to use
polymorphic *node classes* (using Scala's case classes, see
here
https://github.com/FaKod/SJersey/blob/master/src/test/scala/org/sjersey/test/json/polymorphic/Animal.scala
).
Christopher
On Sat, Jan 1, 2011 at 9:59 AM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Christopher,
Happy New Year! I tried to fork and adapt the code to reflect the
updated REST API, but the variable index listing under
/db/data/index/node is too hard for my Scala skillz ... Feel free to
pull, diff and correct :)
/Peter
On Wednesday, December 29, 2010, Christopher Schmidt
fakod...@googlemail.com wrote:
I am answering my own thread here, just in case someone is
interested...
I solved my unmarshaling issue with Neo4j REST, JAXB and Jersey with
using
the Jackson JSON processor (http://jackson.codehaus.org/) instead of
Jersey
JSON.
This makes it easy to write a POPO representation of Neo4j's REST
*objects*.
I implemented some of them (in Scala), see here:
https://github.com/FaKod/SJersey/tree/master/src/test/scala/org/sjersey/test/json/neo4jstuff
The usage is rather simple. I tested it with a *specs* test class
here:
https://github.com/FaKod/SJersey/blob/master/src/test/scala/org/sjersey/test/AccessTest.scala
Although some idea files are checked in, it should be able to check it
out
with maven2 (pom.xml).
I have written a blog post about this POC
here
http://blog.fakod.eu/2010/12/10/yet-another-trya-rest-client-with-jersey-and-scala/
,
as I said: Just in case someone is interested to use Scala, Jersey and
the
Neo4j REST server ;)
Christopher
On Wed, Dec 8, 2010 at 4:09 PM, Christopher Schmidt
fakod...@googlemail.com
wrote:
I have a little spare time ;-) and I try to create a/another very
smart
REST client DSL in Scala.
For testing and test data I am using the Neo4j Server from here:
http://blog.neo4j.org/2010/04/neo4j-rest-server-part1-get-it-going.html
Client library is Jersey, JSON marshaling and unmarshaling lib is
JAXB.
The
current client Scala code is:
rest {
implicit s =
val traversalPath = node/3/traverse/path.POST[JSONArray] =
PathRequest(order = depth first, max_depth = 4, uniqueness = node
path)
println(Array length: + traversalPath.length) // prints 2
}
The above JSONArray works fine, but if I use Java objects
(as XmlRootElement) I get unmarshaling exceptions. It would be
helpful
Re: [Neo4j] Neo4j REST API and JAXB
Hi Jim, all I can say is, that I was not able to unmarshal the anonymous
array containing a anonymous object returned from a POST to traverse/path.
All I got was a ArrayOutOfBounds exception (I used the
maven jersey-json dependency). Maybe just an issue with the combination of
Jersey and JAXB.
Normally this code should work:
GenericTypeCollectionTraverse genericType = new
GenericTypeCollectionTraverse() {};
CollectionTraverse ja = webResource.path(node/3/traverse/path)
.accept(MediaType.APPLICATION_JSON)
.type(MediaType.APPLICATION_JSON)
.post(genericType, {\order\:\depth first\, \max
depth\: 1});
for this JAXB Entity:
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement
public class Traverse {
public String start;
. . .
}
And I did not get any answer from the Jersey users list.
Java.net is currently down once again :-( so I can not post the link to my
question.
Christopher
On Thu, Dec 30, 2010 at 5:15 PM, Jim Webber j...@neotechnology.com wrote:
Hi Christoper, Peter,
I wonder if this is some horrid coupling creeping in since AFAIK we also
use Jackson for JSON production. Perhaps its own eccentricities are escaping
our service boundary.
Anyone know if Jackson is/isn't very compliant?
Jim
On 29 Dec 2010, at 23:41, Peter Neubauer wrote:
Very cool Christopher,
Tis looks like a perfect way to test the server. As we are considering
using more scale in at least our testing, we really should look into
this for easing web testing to start with! I guess Andres and Andreas
will be all over this after New Year :)
/Peter
On Wednesday, December 29, 2010, Christopher Schmidt
fakod...@googlemail.com wrote:
I am answering my own thread here, just in case someone is interested...
I solved my unmarshaling issue with Neo4j REST, JAXB and Jersey with
using
the Jackson JSON processor (http://jackson.codehaus.org/) instead of
Jersey
JSON.
This makes it easy to write a POPO representation of Neo4j's REST
*objects*.
I implemented some of them (in Scala), see here:
https://github.com/FaKod/SJersey/tree/master/src/test/scala/org/sjersey/test/json/neo4jstuff
The usage is rather simple. I tested it with a *specs* test class here:
https://github.com/FaKod/SJersey/blob/master/src/test/scala/org/sjersey/test/AccessTest.scala
Although some idea files are checked in, it should be able to check it
out
with maven2 (pom.xml).
I have written a blog post about this POC
here
http://blog.fakod.eu/2010/12/10/yet-another-trya-rest-client-with-jersey-and-scala/
,
as I said: Just in case someone is interested to use Scala, Jersey and
the
Neo4j REST server ;)
Christopher
On Wed, Dec 8, 2010 at 4:09 PM, Christopher Schmidt
fakod...@googlemail.com
wrote:
I have a little spare time ;-) and I try to create a/another very
smart
REST client DSL in Scala.
For testing and test data I am using the Neo4j Server from here:
http://blog.neo4j.org/2010/04/neo4j-rest-server-part1-get-it-going.html
Client library is Jersey, JSON marshaling and unmarshaling lib is JAXB.
The
current client Scala code is:
rest {
implicit s =
val traversalPath = node/3/traverse/path.POST[JSONArray] =
PathRequest(order = depth first, max_depth = 4, uniqueness = node
path)
println(Array length: + traversalPath.length) // prints 2
}
The above JSONArray works fine, but if I use Java objects
(as XmlRootElement) I get unmarshaling exceptions. It would be helpful
If
there is someone out there who already created some JAXB objects for
Neo4j...
Christopher
On Wed, Dec 8, 2010 at 3:56 PM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Christopher,
are you trying to build your own server, or are you using Neo4j
Server?
The REST API is now part of the server component, we are right now
defining a mechanism to mount your own server extensions without
breaking the REST hypermedia of the existing API.
What are you trying to do?
Cheers,
/peter neubauer
GTalk: neubauer.peter
Skype peter.neubauer
Phone +46 704 106975
LinkedIn http://www.linkedin.com/in/neubauer
Twitter http://twitter.com/peterneubauer
http://www.neo4j.org - Your high performance graph
database.
http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing
party.
On Wed, Dec 8, 2010 at 3:52 PM, Christopher Schmidt
fakod...@googlemail.com wrote:
Hi all, is anyone using the REST interface and JAXB?
I have some problems with the traversal response of POST call to
/node/3/traverse/path which returns:
[ {
start : http://localhost:/node/3;,
nodes : [ http://localhost:/node/3;,
http://localhost:/node/1;
],
length : 1,
relationships : [ http://localhost:/relationship/6; ],
end : http://localhost:/node/1;
}, {
start : http
Re: [Neo4j] Neo4j REST API and JAXB
I am answering my own thread here, just in case someone is interested...
I solved my unmarshaling issue with Neo4j REST, JAXB and Jersey with using
the Jackson JSON processor (http://jackson.codehaus.org/) instead of Jersey
JSON.
This makes it easy to write a POPO representation of Neo4j's REST *objects*.
I implemented some of them (in Scala), see here:
https://github.com/FaKod/SJersey/tree/master/src/test/scala/org/sjersey/test/json/neo4jstuff
The usage is rather simple. I tested it with a *specs* test class here:
https://github.com/FaKod/SJersey/blob/master/src/test/scala/org/sjersey/test/AccessTest.scala
Although some idea files are checked in, it should be able to check it out
with maven2 (pom.xml).
I have written a blog post about this POC
herehttp://blog.fakod.eu/2010/12/10/yet-another-trya-rest-client-with-jersey-and-scala/,
as I said: Just in case someone is interested to use Scala, Jersey and the
Neo4j REST server ;)
Christopher
On Wed, Dec 8, 2010 at 4:09 PM, Christopher Schmidt fakod...@googlemail.com
wrote:
I have a little spare time ;-) and I try to create a/another very smart
REST client DSL in Scala.
For testing and test data I am using the Neo4j Server from here:
http://blog.neo4j.org/2010/04/neo4j-rest-server-part1-get-it-going.html
Client library is Jersey, JSON marshaling and unmarshaling lib is JAXB. The
current client Scala code is:
rest {
implicit s =
val traversalPath = node/3/traverse/path.POST[JSONArray] =
PathRequest(order = depth first, max_depth = 4, uniqueness = node path)
println(Array length: + traversalPath.length) // prints 2
}
The above JSONArray works fine, but if I use Java objects
(as XmlRootElement) I get unmarshaling exceptions. It would be helpful If
there is someone out there who already created some JAXB objects for
Neo4j...
Christopher
On Wed, Dec 8, 2010 at 3:56 PM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Christopher,
are you trying to build your own server, or are you using Neo4j Server?
The REST API is now part of the server component, we are right now
defining a mechanism to mount your own server extensions without
breaking the REST hypermedia of the existing API.
What are you trying to do?
Cheers,
/peter neubauer
GTalk: neubauer.peter
Skype peter.neubauer
Phone +46 704 106975
LinkedIn http://www.linkedin.com/in/neubauer
Twitter http://twitter.com/peterneubauer
http://www.neo4j.org - Your high performance graph
database.
http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
On Wed, Dec 8, 2010 at 3:52 PM, Christopher Schmidt
fakod...@googlemail.com wrote:
Hi all, is anyone using the REST interface and JAXB?
I have some problems with the traversal response of POST call to
/node/3/traverse/path which returns:
[ {
start : http://localhost:/node/3;,
nodes : [ http://localhost:/node/3;,
http://localhost:/node/1;
],
length : 1,
relationships : [ http://localhost:/relationship/6; ],
end : http://localhost:/node/1;
}, {
start : http://localhost:/node/3;,
nodes : [ http://localhost:/node/3;,
http://localhost:/node/2;
],
length : 1,
relationships : [ http://localhost:/relationship/2; ],
end : http://localhost:/node/2;
} ]
Does anyone know how to define the JAXB objects?
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
___
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___
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--
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twitter: @fakod
blog: http://blog.fakod.eu
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
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Re: [Neo4j] Transaction and REST API
I written a couple of REST services and clients over the past years and it is always a subject of discussions: How to map transactions with a stateless RESTful service? We always did it like Neo4j, every REST call is a implicit transaction. If this is not sufficient we implemented BULK or combined calls for bulk deletions or creations etc. But the question is: Is it really impossible to implement transactions? We can use - the session context with invalidating a session or timeout is a rollback (this will be expensive...) - or POSTing a new transaction returning a Trx ID, subsequent write or update operations are containing a transaction ID - using custom HTTP header - (whatever) All this violates the stateless paradigm. But the reality of the Web is: we do have HTTP sessions, cookies, baskets etc. And scalability is a question of server implementation, isn't it? What do you think? On Mon, Dec 20, 2010 at 12:28 PM, Jim Webber j...@neotechnology.com wrote: Hi Ido, Those make good sense. And I think I have some reasonable RESTful approaches in mind for tackling them which don't need transactions (using Ian Robinson's typed links to forms approach here). 1. Bulk create of nodes and relations: - PUT a set of nodes and relations to the server, relative to some node, or to the graph itself. - Work needed: define a graph format (e.g. using JSON) to describe nodes and relations. 2. Remove relations: - GET a removal form (optional, will be cacheable for a long time anyway) - Populate the removal form with the nodes to be deleted, POST it to the server - Server responds with the URI of a (transient) resource that represents all the nodes and relations you previously specified. - DELETE the transient resource - Work needed: design a removal form (effectively a deletion manifest), a little processing logic on the server side 3. Clone subgraphs - Use a form to select a start node, terminating condition (e.g. depth), POST its URI to the cloning URI with a traversal description (or just something as simple as a termination condition for a df/bf search) which itself is created by filling in a form. - Work needed: a clone algorithm for the server; form that allows us to describe the graph for the clone; URI to POST back the form to the graph. OK, so there's some substantial work to be done here. But there's a positive point to take away from this. In the latest milestone release we have a Plugin mechanism where end users are able to extend the behaviour of graphs/nodes in order to implement all these kinds of domain specific things. Right now as we're testing the new Plugin stuff, I'm going to implement a simple clone subgraph plugin. I'll post the code and the wire-level HTTP here when I'm done so you can see how you might implement similar stuff for your domain (the code will also be in SVN under examples/server-extension). Jim PS - It occurs to me though, that if 3rd party plugins become very popular, we could over time bring them into core and take some responsibility for them. Perhaps. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Neo4j REST API and JAXB
Thx Jim, I updated to V1.2.M05 I had to change port and base URI. Is this http://components.neo4j.org/neo4j-rest is still valid? Christopher PS: Bought your REST book yesterday ;-) Nice to have you here. On Thu, Dec 9, 2010 at 5:21 AM, Jim Webber j...@neotechnology.com wrote: Hi Christopher, Although I can't immediately give you a solution to your JAXB question, I can give you another minor problem :-) The REST api is now merged with the Neo4j server and all current and future work is happening on the server component. It shouldn't involve any code changes for you, but can you switch to server to host your DB just so I know you're on the latest version? Jim PS - There might be a config change needed, the default port changed to 7474 compared to the old, deprecated REST api. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Neo4j REST API and JAXB
Hi all, is anyone using the REST interface and JAXB?
I have some problems with the traversal response of POST call to
/node/3/traverse/path which returns:
[ {
start : http://localhost:/node/3;,
nodes : [ http://localhost:/node/3;, http://localhost:/node/1;
],
length : 1,
relationships : [ http://localhost:/relationship/6; ],
end : http://localhost:/node/1;
}, {
start : http://localhost:/node/3;,
nodes : [ http://localhost:/node/3;, http://localhost:/node/2;
],
length : 1,
relationships : [ http://localhost:/relationship/2; ],
end : http://localhost:/node/2;
} ]
Does anyone know how to define the JAXB objects?
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
___
Neo4j mailing list
User@lists.neo4j.org
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Re: [Neo4j] Neo4j REST API and JAXB
I have a little spare time ;-) and I try to create a/another very smart
REST client DSL in Scala.
For testing and test data I am using the Neo4j Server from here:
http://blog.neo4j.org/2010/04/neo4j-rest-server-part1-get-it-going.html
Client library is Jersey, JSON marshaling and unmarshaling lib is JAXB. The
current client Scala code is:
rest {
implicit s =
val traversalPath = node/3/traverse/path.POST[JSONArray] =
PathRequest(order = depth first, max_depth = 4, uniqueness = node path)
println(Array length: + traversalPath.length) // prints 2
}
The above JSONArray works fine, but if I use Java objects
(as XmlRootElement) I get unmarshaling exceptions. It would be helpful If
there is someone out there who already created some JAXB objects for
Neo4j...
Christopher
On Wed, Dec 8, 2010 at 3:56 PM, Peter Neubauer
peter.neuba...@neotechnology.com wrote:
Christopher,
are you trying to build your own server, or are you using Neo4j Server?
The REST API is now part of the server component, we are right now
defining a mechanism to mount your own server extensions without
breaking the REST hypermedia of the existing API.
What are you trying to do?
Cheers,
/peter neubauer
GTalk: neubauer.peter
Skype peter.neubauer
Phone +46 704 106975
LinkedIn http://www.linkedin.com/in/neubauer
Twitter http://twitter.com/peterneubauer
http://www.neo4j.org - Your high performance graph database.
http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party.
On Wed, Dec 8, 2010 at 3:52 PM, Christopher Schmidt
fakod...@googlemail.com wrote:
Hi all, is anyone using the REST interface and JAXB?
I have some problems with the traversal response of POST call to
/node/3/traverse/path which returns:
[ {
start : http://localhost:/node/3;,
nodes : [ http://localhost:/node/3;,
http://localhost:/node/1;
],
length : 1,
relationships : [ http://localhost:/relationship/6; ],
end : http://localhost:/node/1;
}, {
start : http://localhost:/node/3;,
nodes : [ http://localhost:/node/3;,
http://localhost:/node/2;
],
length : 1,
relationships : [ http://localhost:/relationship/2; ],
end : http://localhost:/node/2;
} ]
Does anyone know how to define the JAXB objects?
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
___
Neo4j mailing list
User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
___
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User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
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Re: [Neo4j] Neo4j REST API and JAXB
Hi Ivan, there is only one JAXB object here:
https://github.com/ept/neo4j-scala-template/blob/master/src/main/scala/com/example/models/Moo.scala
But thanks anyway :-)
BTW: For this Rest GET index call:
rest {
implicit s =
val index = /index.GET[GetIndex]
}
the following JAXB objects do work fine:
@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement
class GetIndex {
var node:Array[Node] = _
}
@XmlAccessorType(XmlAccessType.FIELD)
class Node {
var template:String = _
var `type`:String = _
}
The returned JSON object to unmarshal is:
{
node : [ {
template : http://localhost:/index/node/{key}/{value};,
type : lookup
} ]
}
On Wed, Dec 8, 2010 at 4:08 PM, ivan Brusic i...@brusic.com wrote:
I have not tried it, but the scala-template project uses JAXB:
https://github.com/ept/neo4j-scala-template
The project contains a few working examples of Scala + JAXB. Perhaps it
will provide some further insights.
--
Ivan
On Wed, Dec 8, 2010 at 9:52 AM, Christopher Schmidt
fakod...@googlemail.com
wrote:
Hi all, is anyone using the REST interface and JAXB?
I have some problems with the traversal response of POST call to
/node/3/traverse/path which returns:
[ {
start : http://localhost:/node/3;,
nodes : [ http://localhost:/node/3;,
http://localhost:/node/1
],
length : 1,
relationships : [ http://localhost:/relationship/6; ],
end : http://localhost:/node/1;
}, {
start : http://localhost:/node/3;,
nodes : [ http://localhost:/node/3;,
http://localhost:/node/2
],
length : 1,
relationships : [ http://localhost:/relationship/2; ],
end : http://localhost:/node/2;
} ]
Does anyone know how to define the JAXB objects?
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
___
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User@lists.neo4j.org
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https://lists.neo4j.org/mailman/listinfo/user
--
Christopher
twitter: @fakod
blog: http://blog.fakod.eu
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Re: [Neo4j] [SPAM] Re: REST Server API
Yes - URIs are opaque. But f.e. the Jersey Client API explicitly supports
adding query parameters to a WebResource object. So I think it would be a
good idea to support that. For me a URI (in a sense of a path) should define
a resource and should not be dependent of an internal state (what it's the
case if we append query parameter to an URI). Nevertheless I know that query
parameter do belong to an URI, so it's more a personal thing.
I have nothing against JSON. It's a really simple, non type safe way to
handle objects, but simplicity can be an advantage. It is fast and I can use
it with Jersey and with JavaScript very easy, all what I need is already
there.
I am very curios about how it will feel to get a complete graph from the
Neo4j Rest server using a sequence of REST calls with jQuery/native
JavaScript (the little project I am doing in my spare time)
Christopher
On Thu, Nov 18, 2010 at 3:42 PM, Rick Bullotta
rick.bullo...@burningskysoftware.com wrote:
There is nothing fundamentally wrong with JSON (o.k. maybe a *few* things),
but with the right structures, it or any format can be completely
self-describing. I have found that including a bit of additional metadata
in
the content helps IMMENSELY for both loosely-coupled and tightly-coupled
applications. The more it self-describes the content, the better.
Jim, now that you're on the Neo team, I would like to show you the
(domain-specific) REST API we've put around Neo for our application
sometime. Might stimulate some thoughts on your work and provide us some
valuable feedback as well.
We were planning to do a demo for Peter team sometime next week, so LMK
if
you're interested and your availability off-list.
Cheers,
Rick
-Original Message-
From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org]
On
Behalf Of Jim Webber
Sent: Thursday, November 18, 2010 9:04 AM
To: Neo4j user discussions
Subject: [SPAM] Re: [Neo4j] REST Server API
Hi Christopher,
Yes I know what you mean, the {} are part of the JAX-RS specification.
They're part of the URI template specification. JAX-RS uses these URI
templates.
The Neo4j Rest server uses HTTP and JSON thats true, but it violates IMHO
some of the REST principles. I think that a technical interface should
contain, if the content is a link, a well formed URI. I know that a
String
like GET /node/123/relationships/{dir}/{-list||types} means that there
are optional parameter or something like this. Thats OK for a description
in
a Wiki page but not in a returned JSON object.
It's OK for both, but I agree that in general I prefer fully formed URIs.
We'll need to tweak the response representations to include this.
The String GET /node/123/relationships/out/KNOWSLOVES is used as a
query parameter. If it is used as a parameter for a query it should be a
URL-query parameter.
Not necessarily. URIs are opaque, it's only because you're a smart human
that you can infer something from a string like that, but a machine can't.
Using POST /node/123/traverse/{returnType} I can traverse though the
nodes, where returnType is the definition of the kind of objects I want
to
have returned. In the basic REST sense POST is a Insert method where a
newly
created ressource will be returned in the Location tag of a HTTP Header.
For
me this POST is a GET as well, maybe with some query parameter.
Agree with you on that - a traversal is a query and so should be a GET.
There was a thread on that a while back if I remember correctly. The API
will change in future iterations, this would be one of the changes I'd
favour.
If you want to distinguish the returned Types, maybe it is a good idea to
use custom mime types for node, path and relation, if you want to use the
same URI for all.
I don't like creating custom mime types, but at the same time I don't like
JSON (because it's not a hypermedia format, it doesn't understand links).
My
preference would be to use Clojure data structures (once the Clojure guys
have embedded the URI abstraction in the core), and create a standard media
type based on Clojure - but I am a dreamer.
In the meantime, I suspect we're stuck with this non-standard use of JSON.
Jim
PS - Bring on the controversial comments about the REST API, they're good
possible requirements for us.
PPS - I wrote a book about some of this REST stuff with Savas Parastatidis
and Ian Robinson. See: http://restinpractice.com
And to be clear, I like this interface very much :-)
Christopher
On Thu, Nov 18, 2010 at 9:53 AM, Jim Webber j...@neotechnology.com
wrote:
Hi Christopher,
http://localhost:/node/1/relationships/in/{-list||types}
This is a URI template, inviting you to replace the {...} with values of
your own. In this case it's giving you the opportunity to provide a list
of
ampersand separated types.
Now I believe this URI template syntax is out of date compared to the
current
[Neo4j] REST Server API
Hi all, I am checking out the Neo4j REST Server.
I put in the MATRIX examples and used curl -H Accept:application/json -H
Content-Type:application/json -X POST -d '{order:depth first}'
http://localhost:/node/3/traverse/node; to traverse the relations.
While doing that I have seen that the server returns something like
...
traverse : http://localhost:/node/1/traverse/{returnType};,
incoming_typed_relationships :
http://localhost:/node/1/relationships/in/{-list||types}
...
I have some problems to understand the {} values. IMO these are kind of
usage hints, which should not be part of a technical interface.
Isn't it better to place a normal URI there? Or from where does that come
from?
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Christopher
twitter: @fakod
blog: http://blog.fakod.eu
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Re: [Neo4j] REST Server API
Hi Jim,
Yes I know what you mean, the {} are part of the JAX-RS specification.
I hope that I am not too controversy :-)
The Neo4j Rest server uses HTTP and JSON thats true, but it violates IMHO
some of the REST principles. I think that a technical interface should
contain, if the content is a link, a well formed URI. I know that a String
like GET /node/123/relationships/{dir}/{-list||types} means that there
are optional parameter or something like this. Thats OK for a description in
a Wiki page but not in a returned JSON object.
The String GET /node/123/relationships/out/KNOWSLOVES is used as a
query parameter. If it is used as a parameter for a query it should be a
URL-query parameter.
Using POST /node/123/traverse/{returnType} I can traverse though the
nodes, where returnType is the definition of the kind of objects I want to
have returned. In the basic REST sense POST is a Insert method where a newly
created ressource will be returned in the Location tag of a HTTP Header. For
me this POST is a GET as well, maybe with some query parameter.
If you want to distinguish the returned Types, maybe it is a good idea to
use custom mime types for node, path and relation, if you want to use the
same URI for all.
And to be clear, I like this interface very much :-)
Christopher
On Thu, Nov 18, 2010 at 9:53 AM, Jim Webber j...@neotechnology.com wrote:
Hi Christopher,
http://localhost:/node/1/relationships/in/{-list||types}
This is a URI template, inviting you to replace the {...} with values of
your own. In this case it's giving you the opportunity to provide a list of
ampersand separated types.
Now I believe this URI template syntax is out of date compared to the
current spec, but I'll have to validate that.
Perhaps it's even worth thinking about designing this out of the REST API
as we move forwards with Neo4j server. Hmmm
Jim
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Re: [Neo4j] Spatial search using Lucene-spatial?
Hi, I think Lucene provides a simple way to do distance queries. The limit is, that you can use only points (and a circle to define a distance). No interception with lines, polylines or stuff like that is possible. If you do not need it - fine... BTW: There is currently a discussion about changing lucenes spatial implementation. See http://www.mail-archive.com/d...@lucene.apache.org/msg03593.html and http://www.mail-archive.com/d...@lucene.apache.org/msg09654.html. Mainly due to the sinusoidal projection. (and if you are interested, I did Mikes spatial example with Lucene 3.0.2 and in Scala http://blog.fakod.eu/2010/11/02/spatial-lucene-example-in-scala/) -- Christopher twitter: @fakod blog: http://blog.fakod.eu On Sat, Nov 13, 2010 at 11:05 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Hi there, I just tried the examples for searching spatial with Lucene at http://develop.nydi.ch/2010/10/lucene-spatial-example/ I am wondering if this still fits into the current Lucene framework integration, so we could add spatial indexing for simple Nodes with lat/lon properties into the existing index component, or simply have another (spatial) index backed by neo4j-lucene-index and exposed through the index framework? This is not on the level of Neo4j Spatial, but it would give a simple geo-lookup boundary for nodes or relationships. Is the support for adding the required Lucene spatial document fields already exposed so this could be added without bigger modifications to existing code? WDYT? Cheers, /peter neubauer GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Neo4j REST Server with path prefix
Hi all, how can I setup the REST server to use a standard url path prefix? E. g. http://localhost:/MyPathPrefix/node/0/relationshipshttp://localhost:/node/0/relationships -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Graph visualization
I think that the most tricky thing will be the algorithm, that places the nodes and associations in a 3D space. Christopher Am 2010 10 12 11:08 schrieb Andreas Kollegger andreas.kolleg...@neotechnology.com: That would be super cool. 3D could be beautiful, and possibly allow more interesting visualizations of a graph. In addition to an overview of the scene, it would be fun to play with 1st person and 3rd person views of the current node. What would be an easy proof-of-concept? /Andreas On Oct 12, 2010, at 1:19 AM, Andrew Andkjar wrote: I have not seen one in my Internet travels, h... ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Graph visualization
Great. Seems that this in general has something to do with: http://en.wikipedia.org/wiki/Force-based_algorithms_(graph_drawing) Check out these examples: http://code.google.com/p/webglsamples/ working with dev version of Chrome. Flying through a 3D graph would be really fancy :) Am 2010 10 12 12:44 schrieb Andreas Kollegger andreas.kolleg...@neotechnology.com: Googling around for force directed layout java reveals Graphael, which might be an option -- http://graphael.cs.arizona.edu/ On Oct 12, 2010, at 12:24 PM, Alex Averbuch wrote: Hey, igraph already supports 3D layouts an... ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Graph visualization
Mathieu, I saw your screenshots - awesome. Do you have any experience with HTML5/WebGL? The advantage would be that the model could be completely created and rendered in a Browser (simply using the REST interface). This is, of course, heavy JavaScript programming :) Christopher On Tuesday, October 12, 2010, Mathieu Bastian mathieu.bast...@gmail.com wrote: Hi, I'm Gephi main developer and I would like to inform you that we have have some common aims. We would like to build a standard WebGL library for large graph visualization on the web. You can find more informations on the Gephi wiki: http://wiki.gephi.org/index.php/Specification_-_Graph_Visualization_on_the_web And, you may not be aware but you're about to release the Neo4j plug-in for Gephi. It is described here: http://gephi.org/2010/gsoc-2010-mid-term-adding-support-for-neo4j-in-gephi/ And for 3D layouts, I think they are difficult to use. I prefer when a representation is 2D and I can explore it like a geographical map. 3D is fancy but if you have more than 100 elements on screen, users get lost. For force-directed layout implementations in Java, I recommend to look into Gephi, Cytoscape or JUNG source code. Hope this helps, Mathieu On Tue, Oct 12, 2010 at 1:32 PM, Christopher Schmidt fakod...@googlemail.com wrote: Great. Seems that this in general has something to do with: http://en.wikipedia.org/wiki/Force-based_algorithms_(graph_drawing)http://en.wikipedia.org/wiki/Force-based_algorithms_%28graph_drawing%29 Check out these examples: http://code.google.com/p/webglsamples/ working with dev version of Chrome. Flying through a 3D graph would be really fancy :) Am 2010 10 12 12:44 schrieb Andreas Kollegger andreas.kolleg...@neotechnology.com: Googling around for force directed layout java reveals Graphael, which might be an option -- http://graphael.cs.arizona.edu/ On Oct 12, 2010, at 12:24 PM, Alex Averbuch wrote: Hey, igraph already supports 3D layouts an... ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Christopher twitter: @fakod blog: http://blog.fakod.eu ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
