Re: [Neo4j] How to create a pipe (User Defined Step), which returns a set of Vertices for each of input Vertex
Hi All,
I am sorry for my previous email, I made a mistake and chose a wrong mailing
list (neo4j instead of gremlin mailing list).
Best Regards,
Wojtek
Dnia 18 października 2011 9:59 skarab77 napisał(a):
> I need a pipe, which returns a set of vertices for an input Vertex (wrapped
> in User Defined Step). I use blueprints pipes with Neo4j. My current code is:
>
> import org.junit.Test
> import com.tinkerpop.blueprints.pgm.Graph
> import com.tinkerpop.blueprints.pgm.Vertex
> import com.tinkerpop.blueprints.pgm.impls.neo4j.Neo4jVertex
> import com.tinkerpop.blueprints.pgm.impls.tg.TinkerGraphFactory
> import com.tinkerpop.gremlin.Gremlin
> import com.tinkerpop.pipes.AbstractPipe
> import com.tinkerpop.pipes.Pipe
>
> class MyUDSTest {
>
> public static class MyPipe extends AbstractPipe> {
>
> @Override
> protected Iterable processNextStart() throws
> NoSuchElementException {
> def v = this.starts.next();
>
> def nodes = [v, v, v].iterator;
>
> return new Iterable() {
> @Override
> public Iterator iterator() {
> return new Iterator() {
> @Override
> public boolean hasNext() {
> return nodes.hasNext();
> }
>
> @Override
> public Vertex next() {
> return new Neo4jVertex(nodes.next(), graph);
> }
>
> @Override
> public void remove() {
> throw new UnsupportedOperationException();
>
> }
> };
> }
> };
> }
>
> }
>
> @Test
> public void testUDS()
> {
> Gremlin.load();
> Graph g;
> Gremlin.defineStep('myPipe',[Vertex,Pipe], { new MyPipe() })
>
> g = TinkerGraphFactory.createTinkerGraph()
> println "$g"
> def result = []
> g.v(1).myPipe.filter{true} >> result
>
> result.each {
> println "$it"
> }
>
> }
>
> }
>
> However it does not work property in the gremlin expression:
>
> Gremlin.defineStep('myPipe',[Vertex,Pipe], { new MyPipe() })
> ...
> def result = [];
> g.v(1).myPipe >> result
>
> result.each
> {
> println it
> }
>
> prints out: neo4j.MyUDSTest$MyPipe$1@49aacd5f. I would expect that I will get
> a list of vertices. Could anybody help me with this pipe?
>
>
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[Neo4j] How to create a pipe (User Defined Step), which returns a set of Vertices for each of input Vertex
I need a pipe, which returns a set of vertices for an input Vertex (wrapped in
User Defined Step). I use blueprints pipes with Neo4j. My current code is:
import org.junit.Test
import com.tinkerpop.blueprints.pgm.Graph
import com.tinkerpop.blueprints.pgm.Vertex
import com.tinkerpop.blueprints.pgm.impls.neo4j.Neo4jVertex
import com.tinkerpop.blueprints.pgm.impls.tg.TinkerGraphFactory
import com.tinkerpop.gremlin.Gremlin
import com.tinkerpop.pipes.AbstractPipe
import com.tinkerpop.pipes.Pipe
class MyUDSTest {
public static class MyPipe extends AbstractPipe> {
@Override
protected Iterable processNextStart() throws NoSuchElementException
{
def v = this.starts.next();
def nodes = [v, v, v].iterator;
return new Iterable() {
@Override
public Iterator iterator() {
return new Iterator() {
@Override
public boolean hasNext() {
return nodes.hasNext();
}
@Override
public Vertex next() {
return new Neo4jVertex(nodes.next(), graph);
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
};
}
}
@Test
public void testUDS()
{
Gremlin.load();
Graph g;
Gremlin.defineStep('myPipe',[Vertex,Pipe], { new MyPipe() })
g = TinkerGraphFactory.createTinkerGraph()
println "$g"
def result = []
g.v(1).myPipe.filter{true} >> result
result.each {
println "$it"
}
}
}
However it does not work property in the gremlin expression:
Gremlin.defineStep('myPipe',[Vertex,Pipe], { new MyPipe() })
...
def result = [];
g.v(1).myPipe >> result
result.each
{
println it
}
prints out: neo4j.MyUDSTest$MyPipe$1@49aacd5f. I would expect that I will get a
list of vertices. Could anybody help me with this pipe?
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[Neo4j] TransactionFailureException
Hi, I have the following problem: when my program crash in the middle of the transaction, I am not able to start my neo4j embedded store again. I get the following exception. Exception in thread "main" org.neo4j.graphdb.TransactionFailureException: Unable to start TM, no active tx log file found but found either tm_tx_log.1 or tm_tx_log.2 file, please set one of them as active or remove them. at org.neo4j.kernel.impl.transaction.TxManager.init(TxManager.java:175) at org.neo4j.kernel.impl.transaction.TxModule.start(TxModule.java:96) at org.neo4j.kernel.GraphDbInstance.start(GraphDbInstance.java:161) at org.neo4j.kernel.EmbeddedGraphDbImpl.(EmbeddedGraphDbImpl.java:190) at org.neo4j.kernel.EmbeddedGraphDatabase.(EmbeddedGraphDatabase.java:80) at org.neo4j.kernel.EmbeddedGraphDatabase.(EmbeddedGraphDatabase.java:64) My settings are: Neo4j 1.4.1 (1.5M1) Community Version, Windows 7 64bit, JDK 1.6.27 32bit. The file tm_tx_log.1 is empty. My code is following the neo4j guideline: //http://wiki.neo4j.org/content/Transactions and I have also registered shutdownHook to close Neo4j in case of an error. Best Regards, Wojtek ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Relationship[3] exist but relationship type[2] not found.
Hi All, I have get the following exception: Exception in thread "AWT-EventQueue-0" org.neo4j.graphdb.NotFoundException: Relationship[1451488] exist but relationship type[2] not found. at org.neo4j.kernel.impl.core.NodeManager.getRelForProxy(NodeManager.java:566) at org.neo4j.kernel.impl.core.RelationshipProxy.getType(RelationshipProxy.java:75) >From this post >(http://neo4j-community-discussions.438527.n3.nabble.com/Neo-NotFoundException-Question-td717235.html) > I have learned that it can indicate that my neo4j instance is in the >inconsistency state. Is it possible to fix this issue, is it possible to add >somehow the missing relationship type? Best Regards, Wojtek ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
