Re: [Neo4j] Any webservice based spring data graph example
) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.Server.doStart(Server.java:222) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.plugin.Jetty6PluginServer.start(Jetty6PluginServer.java:132) at org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:371) at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:307) at org.mortbay.jetty.plugin.AbstractJettyRunMojo.execute(AbstractJettyRunMojo.java:203) at org.mortbay.jetty.plugin.Jetty6RunMojo.execute(Jetty6RunMojo.java:184) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:107) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59) at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:319) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:534) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196) at org.apache.maven.cli.MavenCli.main(MavenCli.java:141) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) On Tue, Aug 16, 2011 at 5:59 AM, Andreas Kollegger andreas.kolleg...@neotechnology.com wrote: Hi Vipul, What was the trouble you were having with Apache CXF? Were you deploying Neo4j as an embedded database, intending to use CXF to expose an interface? Or were you accessing Neo4j Server's REST api from Apache CXF? I'm not aware of any example projects that have used Apache CXF, but am pretty interested to hear about your experiences. Cheers, Andreas On Aug 15, 2011, at 8:07 AM, Vipul Gupta wrote: I was having some trouble integrating Apache CXF with Spring data graph container. So I am wondering if there is any webservice based spring data graph example for which I can look at the source code. Please let me know Thanks ___ 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
Re: [Neo4j] Any webservice based spring data graph example
nested exception for cause of error at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:288) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1003) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:907) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190) at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:322) ... 80 more Caused by: org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.neo4j.kernel.EmbeddedGraphDatabase]: Constructor threw ex ception; nested exception is org.neo4j.graphdb.TransactionFailureException: Could not create data source [nioneodb], see nested exception for cause of error at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:141) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:108) at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:280) ... 89 more Caused by: org.neo4j.graphdb.TransactionFailureException: Could not create data source [nioneodb], see nested exception for cause of error at org.neo4j.kernel.impl.transaction.TxModule.registerDataSource(TxModule.java:153) at org.neo4j.kernel.GraphDbInstance.start(GraphDbInstance.java:111) at org.neo4j.kernel.EmbeddedGraphDbImpl.init(EmbeddedGraphDbImpl.java:189) at org.neo4j.kernel.EmbeddedGraphDatabase.init(EmbeddedGraphDatabase.java:79) at org.neo4j.kernel.EmbeddedGraphDatabase.init(EmbeddedGraphDatabase.java:63) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:126) ... 91 more Caused by: java.lang.IllegalStateException: Unable to lock store [\neo4j\db\project\graph-project\neostore], this is usually a result of some other Neo4j kernel running using the same store. at org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.checkStorage(CommonAbstractStore.java:266) at org.neo4j.kernel.impl.nioneo.store.CommonAbstractStore.init(CommonAbstractStore.java:169) at org.neo4j.kernel.impl.nioneo.store.AbstractStore.init(AbstractStore.java:120) at org.neo4j.kernel.impl.nioneo.store.NeoStore.init(NeoStore.java:65) at org.neo4j.kernel.impl.nioneo.xa.NeoStoreXaDataSource.init(NeoStoreXaDataSource.java:134) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at org.neo4j.kernel.impl.transaction.XaDataSourceManager.create(XaDataSourceManager.java:75) at org.neo4j.kernel.impl.transaction.TxModule.registerDataSource(TxModule.java:147) On Tue, Aug 16, 2011 at 10:09 PM, Michael Hunger michael.hun...@neotechnology.com wrote: do you by chance have different version of spring on your classpath? mvn dependency:tree helps to figure that out mobile mail please excuse brevity and typos Am 16.08.2011 um 17:53 schrieb Vipul Gupta vipulgupta...@gmail.com: Hi Andreas, Yes, I have been trying to run Neo4j as an embedded database, with CXF exposing a WSDL interface. I was having a number of issues in terms of setting these 2 together. Standalone test cases for just the neo4j graph and internal API works fine. I even migrated to 1.1.0.RELEASE and made relevant changes. Here
Re: [Neo4j] Any webservice based spring data graph example
Thanks Sujit and Saikat. I managed to get it up and running now. Regarding the 2 process issue - I have a homegrown ApplicationContext loader which was loading graph context twice. Managed to figure it out after Sujit's suggestion. On Tue, Aug 16, 2011 at 11:18 PM, Sujit Pal sujit@comcast.net wrote: Hi Vipul, I saw the same issue when trying to expose an embedded Neo4j database (plus some other things) via a Spring webapp. *Caused by: java.lang.IllegalStateException: Unable to lock store [\neo4j\db\project\graph-project\neostore], this is usually a result of some other Neo4j kernel** running using the same store. * The problem was that I was trying to instantiate the GraphDatabaseService from two components with a new(). I ended up building a factory that instantiates a singleton and returns a reference to the same GraphDatabaseService using a getInstance() method to all the components that need a handle to it. In my spring config I declare the bean containing the GraphDatabaseService (nodeService) like so: bean id=nodeService class=...NodeServiceFactory factory-method=getInstance destroy-method=destroy/ where the NodeServiceFactory exposes 2 static methods getInstance() that returns the singleton reference and destroy which closes the reference on application shutdown. In the app, where I was doing a nodeService = new NodeService(), I replaced with nodeService = NodeService.getInstance(). -sujit ___ 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] Any webservice based spring data graph example
I was having some trouble integrating Apache CXF with Spring data graph container. So I am wondering if there is any webservice based spring data graph example for which I can look at the source code. Please let me know Thanks ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Spring Data Graph 1.1.0.M1 milestone released
please give the maven repository information from where it can be downloaded.
On Thu, Jun 16, 2011 at 6:50 PM, Michael Hunger
michael.hun...@neotechnology.com wrote:
You could just use the direct repository factory for that.
directGraphRepositoryFactory.createGraphRepository(clazz).findAll()
normally you would have a
interface PersonRepository extends GraphRepositoryPerson {}
and get this injected.
@Autowired PersonRepository personRepository;
personRepository.findAll();
Cheers
Michael
Today I discussed some nice derived-method for cypher queries.
See:
https://github.com/SpringSource/spring-data-graph/wiki/Repository-query-methods
Am 16.06.2011 um 14:30 schrieb Alfredas Chmieliauskas:
Dear Michael,
sounds great! Especially the annotated repository methods. That was
something *really* desirable and now its there. Fantastischt!
One question though. Before the upgrade i used to have a handy method
to find all things of a type (Class) by using a method like
public T extends NodeBacked IterableT findAll(ClassT clazz) {
finderFactory.createNodeEntityFinder(clazz).findAll();
}
is there a good way to replicate such functionality in the current release?
Alfredas
P.S. we're delayed with publishing our energy simulations (bureaucracy
problems more than technical or conceptual). but i'm still determined
to make it happen (publish the thing online) before summer end.
On Wed, Jun 15, 2011 at 10:17 AM, Michael Hunger
michael.hun...@neotechnology.com wrote:
Dear Graphistas,
After some quiet time that I spend on other important issues, we're back on
our regular release cycle/rhythm.
We discussed the future SDG roadmap with our CEO Emil and decided to work
first on the issues that were
reported by our users here on the mailing list, on the spring forums and on
twitter.
So primarily we updated the dependencies to Neo4j 1.4.M04 and AspectJ
(1.6.12.M1), the latter fixing some issues.
With the new Neo4j release we are also able to start working some important
new features.
The most interesting one is the adoption of the query language cypher
which is now accessible from NodeEntities (dynamic annotated fields,
introduced methods) and repositories (annotated repository interface
methods).
(https://jira.springsource.org/browse/DATAGRAPH-91)
Example, NodeEntity-field:
@GraphQuery(start me=(%d) match
(me)-[:works_at]-(company)-[:works_at]-(colleague) return colleague)
IterablePerson colleagues;
Example, Repository:
interface PersonRepository extends GraphRepositoryPerson {
@GraphQuery(start person=(%d) match (person)-[:boss]-(boss) return
boss)
Person findBoss(Person developer);
}
We also accommodate for the change of allowing self-relationships.
Another annoyance for SDG users - the need to specify an elementClass on
@RelatedTo annotations has also been removed this change will also be added
to the other annotations that we use.
We would like to get your feedback on those changes and also on Spring Data
Graph in general, so please check it out and get back to us.
And please spread the word:
http://twitter.com/#!/neo4j/statuses/80503228319547392
Cheers
Michael
Announcement: http://www.springsource.org/node/3152
JIRA: https://jira.springsource.org/browse/DATAGRAPH
Project Page: http://www.springsource.org/spring-data/neo4j
Forum: forum.springsource.org/forumdisplay.php?f=80
Github: http://github.com/springsource/spring-data-graph
Download:
http://www.springsource.com/download/community?project=Spring%20Data%20Neo4j
___
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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
___
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User@lists.neo4j.org
https://lists.neo4j.org/mailman/listinfo/user
___
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Re: [Neo4j] Which version of neo4j does spring data graph project use ?
Michael, I don't see anything released on maven repo yet? Please update. -VIpul On Fri, Jun 10, 2011 at 3:40 PM, Michael Hunger michael.hun...@neotechnology.com wrote: Wait for our spring data graph 1.1.0.M1 release on Monday :) it will be updated to Neo4j 1.4.M04 Cheers Michael Am 10.06.2011 um 11:55 schrieb Vipul Gupta: Please let me know.. I want to use the latest version of neo4j say Neo4j 1.4 M03 “Kiruna with spring data graph. WHat do I do ? ___ 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
[Neo4j] Which version of neo4j does spring data graph project use ?
Please let me know.. I want to use the latest version of neo4j say Neo4j 1.4 M03 “Kiruna with spring data graph. WHat do I do ? ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Which version of neo4j does spring data graph project use ?
Cool. thanks Michael. On Fri, Jun 10, 2011 at 3:40 PM, Michael Hunger michael.hun...@neotechnology.com wrote: Wait for our spring data graph 1.1.0.M1 release on Monday :) it will be updated to Neo4j 1.4.M04 Cheers Michael Am 10.06.2011 um 11:55 schrieb Vipul Gupta: Please let me know.. I want to use the latest version of neo4j say Neo4j 1.4 M03 “Kiruna with spring data graph. WHat do I do ? ___ 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
Re: [Neo4j] Question from Webinar - traversing a path with nodes of different types
Hi David,
Inputs are 1 and 6 + Graph is acyclic.
domain.Client@1 - domain.Router@2 - domain.Router@3 - domain.Router@5 -
domain.Server@6
- domain.Router@7 - domain.Router@8 -
I want a way to start from 1,
process the 2 path till it reaches 5 (say in a thread)
process the 7 path till it reaches 5 (in another thread)
then process 5 and eventually 6.
the above step of processing intermediate path and waiting on the blocking
point can happen over and over again in a more complex graph (that is there
could be a number of loops in between even) and the traversal stops only we
reach 6
I hope this makes it a bit clear. I was working out something for this, but
it is turning out to be too complex a solution for this sort of traversal of
a graph, so I am hoping if you can suggest something.
Best Regards,
Vipul
On Thu, Apr 21, 2011 at 11:36 AM, David Montag
david.mon...@neotechnology.com wrote:
Hi Vipul,
Zooming out a little bit, what are the inputs to your algorithm, and what
do you want it to do?
For example, given 1 and 6, do you want to find any points in the chain
between them that are join points of two (or more) subchains (5 in this
case)?
David
On Wed, Apr 20, 2011 at 10:56 PM, Vipul Gupta vipulgupta...@gmail.comwrote:
my mistake - I meant 5 depends on both 3 and 8 and acts as a blocking
point till 3 and 8 finishes
On Thu, Apr 21, 2011 at 11:19 AM, Vipul Gupta vipulgupta...@gmail.comwrote:
David/Michael,
Let me modify the example a bit.
What if my graph structure is like this
domain.Client@1 - domain.Router@2 - domain.Router@3 - domain.Router@5-
domain.Server@6
- domain.Router@7 - domain.Router@8 -
Imagine a manufacturing line.
6 depends on both 3 and 8 and acts as a blocking point till 3 and 8
finishes.
Is there a way to get a cleaner traversal for such kind of relationship. I
want to get a complete intermediate traversal from Client to Server.
Thank a lot for helping out on this.
Best Regards,
Vipul
On Thu, Apr 21, 2011 at 12:09 AM, David Montag
david.mon...@neotechnology.com wrote:
Hi Vipul,
Thanks for listening!
It's a very good question, and the short answer is: yes! I'm cc'ing our
mailing list so that everyone can take part in the answer.
Here's the long answer, illustrated by an example:
Let's assume you're modeling a network. You'll have some domain classes
that are all networked entities with peers:
@NodeEntity
public class NetworkEntity {
@RelatedTo(type = PEER, direction = Direction.BOTH, elementClass =
NetworkEntity.class)
private SetNetworkEntity peers;
public void addPeer(NetworkEntity peer) {
peers.add(peer);
}
}
public class Server extends NetworkEntity {}
public class Router extends NetworkEntity {}
public class Client extends NetworkEntity {}
Then we can build a small network:
Client c = new Client().persist();
Router r1 = new Router().persist();
Router r21 = new Router().persist();
Router r22 = new Router().persist();
Router r3 = new Router().persist();
Server s = new Server().persist();
c.addPeer(r1);
r1.addPeer(r21);
r1.addPeer(r22);
r21.addPeer(r3);
r22.addPeer(r3);
r3.addPeer(s);
c.persist();
Note that after linking the entities, I only call persist() on the
client. You can read more about this in the reference documentation, but
essentially it will cascade in the direction of the relationships created,
and will in this case cascade all the way to the server entity.
You can now query this:
IterableEntityPathClient, Server paths =
c.findAllPathsByTraversal(Traversal.description());
The above code will get you an EntityPath per node visited during the
traversal from c. The example does however not use a very interesting
traversal description, but you can still print the results:
for (EntityPathClient, Server path : paths) {
StringBuilder sb = new StringBuilder();
IteratorNetworkEntity iter =
path.NetworkEntitynodeEntities().iterator();
while (iter.hasNext()) {
sb.append(iter.next());
if (iter.hasNext()) sb.append( - );
}
System.out.println(sb);
}
This will print each path, with all entities in the path. This is what
it looks like:
domain.Client@1
domain.Client@1 - domain.Router@2
domain.Client@1 - domain.Router@2 - domain.Router@3
domain.Client@1 - domain.Router@2 - domain.Router@3 -
domain.Router@5
domain.Client@1 - domain.Router@2 - domain.Router@3 -
domain.Router@5 - domain.Server@6
domain.Client@1 - domain.Router@2 - domain.Router@3 -
domain.Router@5 - domain.Router@4
Let us know if this is what you looked for. If you want to only find
paths that end with a server, you'd use this query instead:
IterableEntityPathClient, Server paths =
c.findAllPathsByTraversal(Traversal.description().evaluator(new Evaluator()
{
@Override
public Evaluation evaluate(Path path) {
if (new
Re: [Neo4j] Question from Webinar - traversing a path with nodes of different types
David/Michael,
Let me modify the example a bit.
What if my graph structure is like this
domain.Client@1 - domain.Router@2 - domain.Router@3 - domain.Router@5 -
domain.Server@6
- domain.Router@7 - domain.Router@8 -
Imagine a manufacturing line.
6 depends on both 3 and 8 and acts as a blocking point till 3 and 8
finishes.
Is there a way to get a cleaner traversal for such kind of relationship. I
want to get a complete intermediate traversal from Client to Server.
Thank a lot for helping out on this.
Best Regards,
Vipul
On Thu, Apr 21, 2011 at 12:09 AM, David Montag
david.mon...@neotechnology.com wrote:
Hi Vipul,
Thanks for listening!
It's a very good question, and the short answer is: yes! I'm cc'ing our
mailing list so that everyone can take part in the answer.
Here's the long answer, illustrated by an example:
Let's assume you're modeling a network. You'll have some domain classes
that are all networked entities with peers:
@NodeEntity
public class NetworkEntity {
@RelatedTo(type = PEER, direction = Direction.BOTH, elementClass =
NetworkEntity.class)
private SetNetworkEntity peers;
public void addPeer(NetworkEntity peer) {
peers.add(peer);
}
}
public class Server extends NetworkEntity {}
public class Router extends NetworkEntity {}
public class Client extends NetworkEntity {}
Then we can build a small network:
Client c = new Client().persist();
Router r1 = new Router().persist();
Router r21 = new Router().persist();
Router r22 = new Router().persist();
Router r3 = new Router().persist();
Server s = new Server().persist();
c.addPeer(r1);
r1.addPeer(r21);
r1.addPeer(r22);
r21.addPeer(r3);
r22.addPeer(r3);
r3.addPeer(s);
c.persist();
Note that after linking the entities, I only call persist() on the client.
You can read more about this in the reference documentation, but essentially
it will cascade in the direction of the relationships created, and will in
this case cascade all the way to the server entity.
You can now query this:
IterableEntityPathClient, Server paths =
c.findAllPathsByTraversal(Traversal.description());
The above code will get you an EntityPath per node visited during the
traversal from c. The example does however not use a very interesting
traversal description, but you can still print the results:
for (EntityPathClient, Server path : paths) {
StringBuilder sb = new StringBuilder();
IteratorNetworkEntity iter =
path.NetworkEntitynodeEntities().iterator();
while (iter.hasNext()) {
sb.append(iter.next());
if (iter.hasNext()) sb.append( - );
}
System.out.println(sb);
}
This will print each path, with all entities in the path. This is what it
looks like:
domain.Client@1
domain.Client@1 - domain.Router@2
domain.Client@1 - domain.Router@2 - domain.Router@3
domain.Client@1 - domain.Router@2 - domain.Router@3 -
domain.Router@5
domain.Client@1 - domain.Router@2 - domain.Router@3 -
domain.Router@5 - domain.Server@6
domain.Client@1 - domain.Router@2 - domain.Router@3 -
domain.Router@5 - domain.Router@4
Let us know if this is what you looked for. If you want to only find paths
that end with a server, you'd use this query instead:
IterableEntityPathClient, Server paths =
c.findAllPathsByTraversal(Traversal.description().evaluator(new Evaluator()
{
@Override
public Evaluation evaluate(Path path) {
if (new ConvertingEntityPath(graphDatabaseContext,
path).endEntity() instanceof Server) {
return Evaluation.INCLUDE_AND_PRUNE;
}
return Evaluation.EXCLUDE_AND_CONTINUE;
}
}));
In the above code example, graphDatabaseContext is a bean of type
GraphDatabaseContext created by Spring Data Graph. This syntax will
dramatically improve in future releases. It will print:
domain.Client@1 - domain.Router@2 - domain.Router@3 -
domain.Router@5 - domain.Server@6
Regarding your second question about types: If you want to convert a node
into an entity, you would use the TypeRepresentationStrategy configured
internally in Spring Data Graph. See the reference documentation for more
information on this. If you want to convert Neo4j paths to entity paths, you
can use the ConvertingEntityPath class as seen above. As an implementation
detail, the class name is stored on the node as a property.
Hope this helped!
David
On Wed, Apr 20, 2011 at 9:20 AM, Emil Eifrem e...@neotechnology.comwrote:
David / Michael, do you guys want to dig in and help out Vipul below?
-EE
On Wed, Apr 20, 2011 at 09:17, Vipul Gupta vipulgupta...@gmail.com
wrote:
Hi Emil,
I would like to start by thanking you for the webinar. It was very
useful .
This is the question I asked on the webinar as well.
How can we traverse a graph which consists of nodes of different types
using
SDG?
Say first Node in relationship is of type A, next 3 nodes in path
Re: [Neo4j] Question from Webinar - traversing a path with nodes of different types
my mistake - I meant 5 depends on both 3 and 8 and acts as a blocking
point till 3 and 8 finishes
On Thu, Apr 21, 2011 at 11:19 AM, Vipul Gupta vipulgupta...@gmail.comwrote:
David/Michael,
Let me modify the example a bit.
What if my graph structure is like this
domain.Client@1 - domain.Router@2 - domain.Router@3 - domain.Router@5-
domain.Server@6
- domain.Router@7 - domain.Router@8 -
Imagine a manufacturing line.
6 depends on both 3 and 8 and acts as a blocking point till 3 and 8
finishes.
Is there a way to get a cleaner traversal for such kind of relationship. I
want to get a complete intermediate traversal from Client to Server.
Thank a lot for helping out on this.
Best Regards,
Vipul
On Thu, Apr 21, 2011 at 12:09 AM, David Montag
david.mon...@neotechnology.com wrote:
Hi Vipul,
Thanks for listening!
It's a very good question, and the short answer is: yes! I'm cc'ing our
mailing list so that everyone can take part in the answer.
Here's the long answer, illustrated by an example:
Let's assume you're modeling a network. You'll have some domain classes
that are all networked entities with peers:
@NodeEntity
public class NetworkEntity {
@RelatedTo(type = PEER, direction = Direction.BOTH, elementClass =
NetworkEntity.class)
private SetNetworkEntity peers;
public void addPeer(NetworkEntity peer) {
peers.add(peer);
}
}
public class Server extends NetworkEntity {}
public class Router extends NetworkEntity {}
public class Client extends NetworkEntity {}
Then we can build a small network:
Client c = new Client().persist();
Router r1 = new Router().persist();
Router r21 = new Router().persist();
Router r22 = new Router().persist();
Router r3 = new Router().persist();
Server s = new Server().persist();
c.addPeer(r1);
r1.addPeer(r21);
r1.addPeer(r22);
r21.addPeer(r3);
r22.addPeer(r3);
r3.addPeer(s);
c.persist();
Note that after linking the entities, I only call persist() on the client.
You can read more about this in the reference documentation, but essentially
it will cascade in the direction of the relationships created, and will in
this case cascade all the way to the server entity.
You can now query this:
IterableEntityPathClient, Server paths =
c.findAllPathsByTraversal(Traversal.description());
The above code will get you an EntityPath per node visited during the
traversal from c. The example does however not use a very interesting
traversal description, but you can still print the results:
for (EntityPathClient, Server path : paths) {
StringBuilder sb = new StringBuilder();
IteratorNetworkEntity iter =
path.NetworkEntitynodeEntities().iterator();
while (iter.hasNext()) {
sb.append(iter.next());
if (iter.hasNext()) sb.append( - );
}
System.out.println(sb);
}
This will print each path, with all entities in the path. This is what it
looks like:
domain.Client@1
domain.Client@1 - domain.Router@2
domain.Client@1 - domain.Router@2 - domain.Router@3
domain.Client@1 - domain.Router@2 - domain.Router@3 -
domain.Router@5
domain.Client@1 - domain.Router@2 - domain.Router@3 -
domain.Router@5 - domain.Server@6
domain.Client@1 - domain.Router@2 - domain.Router@3 -
domain.Router@5 - domain.Router@4
Let us know if this is what you looked for. If you want to only find paths
that end with a server, you'd use this query instead:
IterableEntityPathClient, Server paths =
c.findAllPathsByTraversal(Traversal.description().evaluator(new Evaluator()
{
@Override
public Evaluation evaluate(Path path) {
if (new ConvertingEntityPath(graphDatabaseContext,
path).endEntity() instanceof Server) {
return Evaluation.INCLUDE_AND_PRUNE;
}
return Evaluation.EXCLUDE_AND_CONTINUE;
}
}));
In the above code example, graphDatabaseContext is a bean of type
GraphDatabaseContext created by Spring Data Graph. This syntax will
dramatically improve in future releases. It will print:
domain.Client@1 - domain.Router@2 - domain.Router@3 -
domain.Router@5 - domain.Server@6
Regarding your second question about types: If you want to convert a node
into an entity, you would use the TypeRepresentationStrategy configured
internally in Spring Data Graph. See the reference documentation for more
information on this. If you want to convert Neo4j paths to entity paths, you
can use the ConvertingEntityPath class as seen above. As an implementation
detail, the class name is stored on the node as a property.
Hope this helped!
David
On Wed, Apr 20, 2011 at 9:20 AM, Emil Eifrem e...@neotechnology.comwrote:
David / Michael, do you guys want to dig in and help out Vipul below?
-EE
On Wed, Apr 20, 2011 at 09:17, Vipul Gupta vipulgupta...@gmail.com
wrote:
Hi Emil,
I would like to start by thanking you for the webinar. It was very
useful .
This is the question I
