I would not use a Runtime shutdown hook from within Tomcat. I would
use a ServletContextListener (override the contextInitialized and
contextDestroyed events), and create singletons for the
GraphDatabaseService/LuceneIndex when the webapp initializes, and
shut them down when the webapp is destroyed. You can only have a
single instance of the GraphDatabaseService active at a time.
Those changes should get you working.
Rick
-------- Original Message --------
Subject: Re: [Neo] Connecting to Neo4j DB from ActionScript
From: Amir Hossein Jadidinejad <amir.jad...@yahoo.com>
Date: Sat, April 10, 2010 2:48 pm
To: Neo user discussions <user@lists.neo4j.org>
Cc: rick.bullo...@burningskysoftware.com
Hi,
After a lot of try/miss attempts, finally I've created both the server
and client sides. I have some problems:
1. I don't know how to manage shutting down stuffs
(GraphDatabaseService and IndexService) in the client side.
2. When I run the flex page for the first time (after restarting the
Tomcat), everything is ok. But when I run it again or refresh the page,
I have a "Error: An unknown exception occurred while creating an
instance of type 'wikipedia.wnng.Connector'." -> It maybe related to
the first item!
3. The source codes are attached, would you please review them or share
some codes that I can solve the problem?
Kind regards,
Amir
--- On Sat, 3/13/10, Rick Bullotta
<rick.bullo...@burningskysoftware.com> wrote:
From: Rick Bullotta <rick.bullo...@burningskysoftware.com>
Subject: Re: [Neo] Connecting to Neo4j DB from ActionScript
To: "'Neo user discussions'" <user@lists.neo4j.org>
Date: Saturday, March 13, 2010, 9:57 AM
Hi, Amir.
Most of what we're doing is fairly specific to our domain model (each
node
has a type and a name property) and technology landscape (WebORB
backend,
for example), but there are some guidelines I can share with you to
help.
1) You'll want to create a viewer based on ExtendedFlexGraph, which
brings
with it a lot of very useful filtering/searching/layout capabilities
that
the base FlexGraph class does not have
2) You'll want to create a custom node renderer and a custom arc
(relationship) renderer. We overrode the newInstance(), set data, and
addToolTipValues() methods to allow us to display Neo node and
relationship
properties in the mouse-over event, and to provide custom text to
display on
each node/relationship. The Neo relationship model fits nicely with
Flexviz
in that an "arc" in Flexviz has a type that corresponds to the
"RelationshipType" in neo. The Neo node model also fits reasonably
well,
with the concept of an "id" (arcs have id's also).
3) You'll need a back-end service (servlet or other) to get data to
your
Flex front end. We're using WebORB, which allows a high performance
bridge
to the Flex app using Flex remoting (and a binary protocol), but you
could
do the same thing with a Flex HTTPService and by outputting XML from a
servlet, perhaps in some variant of GraphML. In the handler for a
response
for the server, you'll then want to parse the result and create the
graph
model inside Flexviz. Here's the code we use (realize that our result
structure is a "native" object, but the same approach could be used
with
XML).
neoModel = response.result as
ArrayCollection;
graph.nodeRenderer = new NeoNodeRenderer();
graph.arcRenderer = new
NeoRelationshipRenderer();
model = new DefaultGraphModel();
var node:Object;
var edge:Object;
for each(node in neoModel) {
var graphNode:DefaultGraphNode = new
DefaultGraphNode(node.id, node.type, node.name, node);
model.addNode(graphNode);
}
for each(node in neoModel) {
for each(edge in node.edges) {
var fromItem: IGraphNode =
model.getNode(edge.fromNode);
var toItem: IGraphNode =
model.getNode(edge.toNode);
var arc:DefaultGraphArc =
new DefaultGraphArc(edge.id, fromItem, toItem, edge.type, edge, false,
true);
model.addArc(arc);
}
}
graph.model = model;
var layout:ILayoutAlgorithm = new
RadialLayoutAlgorithm();
graph.runLayout(layout);
4) On the server side, we created a class that handles client requests,
with
a single parameter corresponding to the "root" node of the request. In
our
case, we don't want to display the entire Neo4J graph - only nodes one
relationship away from a specified node (similar to Neoclipse's default
behavior)
5) On the client, we created a double click handler for the graph so
that
double-clicking a node reinvokes the service with a new "root" node and
redisplays the graph. It is easy to implement a "go back" function by
keeping track of the previous root node id's in a stack.
Hope that helps!
Rick
-----Original Message-----
From: [1]user-boun...@lists.neo4j.org
[mailto:[2]user-boun...@lists.neo4j.org] On
Behalf Of Amir Hossein Jadidinejad
Sent: Saturday, March 13, 2010 12:04 AM
To: Neo user discussions
Subject: Re: [Neo] Connecting to Neo4j DB from ActionScript
Dear Rick,
It's really interesting. Would you please share your experiments with
us?,
Some example, source code,...
Greatly appreciate your help.
Kind regards,
Amir
--- On Fri, 3/12/10, Rick Bullotta
<[3]rick.bullo...@burningskysoftware.com>
wrote:
From: Rick Bullotta <[4]rick.bullo...@burningskysoftware.com>
Subject: Re: [Neo] Connecting to Neo4j DB from ActionScript
To: "'Neo user discussions'" <[5]u...@lists.neo4j.org>
Date: Friday, March 12, 2010, 6:27 PM
Amir, I'm doing something similar (also with Flexviz). I looked at a
number
of other Flex graph visualization libraries (Kapit, SpringGraph,
YFiles,
Raviz/Birdeye, Flare) and definitely preferred Flexviz to the others.
It
seems quite extensible/customizable as well.
I'm using Flex/Flash remoting between the server and the client, and on
the
server side, I'm using WebORB Java.
Rick
-----Original Message-----
From: [6]user-boun...@lists.neo4j.org
[mailto:[7]user-boun...@lists.neo4j.org] On
Behalf Of Amir Hossein Jadidinejad
Sent: Friday, March 12, 2010 5:10 PM
To: Neo user discussions
Subject: Re: [Neo] Connecting to Neo4j DB from ActionScript
Dear Todd,
I'm not familiar with them. Would you please provide me a simple how-to
or
some source code example?
In fact, I'm going to visualise the Neo4j DB using FlexViz. It's really
beautiful and flexible.
Thanks.
Amir
--- On Fri, 3/12/10, Todd Stavish <[8]toddstav...@gmail.com> wrote:
From: Todd Stavish <[9]toddstav...@gmail.com>
Subject: Re: [Neo] Connecting to Neo4j DB from ActionScript
To: "Neo user discussions" <[10]u...@lists.neo4j.org>
Date: Friday, March 12, 2010, 4:43 PM
Hi Amir,
I used GSON (google's json package) on the Neo side and Flex's json
AS3 classes to make the connection.
-Todd
On Fri, Mar 12, 2010 at 4:31 PM, Amir Hossein Jadidinejad
<[11]amir.jad...@yahoo.com> wrote:
> Hi,
> Is it possible to connect a Neo4j instance using ActionScript and
Adobe
Flex?!
> Thanks.
>
>
>
>
> _______________________________________________
> Neo mailing list
> [12]u...@lists.neo4j.org
> [13]https://lists.neo4j.org/mailman/listinfo/user
>
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References
1. http://email02.secureserver.net/mc/compose?to=user-boun...@lists.neo4j.org
2. http://email02.secureserver.net/mc/compose?to=user-boun...@lists.neo4j.org
3.
http://email02.secureserver.net/mc/compose?to=rick.bullo...@burningskysoftware.com
4.
http://email02.secureserver.net/mc/compose?to=rick.bullo...@burningskysoftware.com
5. http://email02.secureserver.net/mc/compose?to=u...@lists.neo4j.org
6. http://email02.secureserver.net/mc/compose?to=user-boun...@lists.neo4j.org
7. http://email02.secureserver.net/mc/compose?to=user-boun...@lists.neo4j.org
8. http://email02.secureserver.net/mc/compose?to=toddstav...@gmail.com
9. http://email02.secureserver.net/mc/compose?to=toddstav...@gmail.com
10. http://email02.secureserver.net/mc/compose?to=u...@lists.neo4j.org
11. http://email02.secureserver.net/mc/compose?to=amir.jad...@yahoo.com
12. http://email02.secureserver.net/mc/compose?to=u...@lists.neo4j.org
13. https://lists.neo4j.org/mailman/listinfo/user
14. http://email02.secureserver.net/mc/compose?to=u...@lists.neo4j.org
15. https://lists.neo4j.org/mailman/listinfo/user
16. http://email02.secureserver.net/mc/compose?to=u...@lists.neo4j.org
17. https://lists.neo4j.org/mailman/listinfo/user
18. http://email02.secureserver.net/mc/compose?to=u...@lists.neo4j.org
19. https://lists.neo4j.org/mailman/listinfo/user
20. http://email02.secureserver.net/mc/compose?to=u...@lists.neo4j.org
21. https://lists.neo4j.org/mailman/listinfo/user
22. http://email02.secureserver.net/mc/compose?to=u...@lists.neo4j.org
23. https://lists.neo4j.org/mailman/listinfo/user
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