Re: [Neo4j] Using the REST neo4j
I see your point and I think that it'd be a good idea to have the ability to build/download a .war file for convenience, in addition to the current format. I don't really see any arguments against it at least. And it should be a fairly easy task to create such an assembly. 2010/9/10, Alexandru Popescu ☀ the.mindstorm.mailingl...@gmail.com: On Tuesday, September 7, 2010, Jacob Hansson ja...@voltvoodoo.com wrote: 2010/9/6 Alexandru Popescu ☀ the.mindstorm.mailingl...@gmail.com On Monday, September 6, 2010, Jim Webber j...@webber.name wrote: Hi Alex, While I still can achieve all these with the current packaging, it feels more hacky: I need to create a new Jetty6BasedWebServer or modify the existing one to enhance it with my own stuff. Each change would require compiling and repackaging the whole neo4j-rest. Definitely not as easy as dropping in my own jar and a new web.xml. That's an interesting point. In a sense, the neo-rest package is Neo's REST package. Interesting... My main question is: what exactly is this package offering to the end user in the current form? IMO it cannot be an off-the-shelf product as there is no security. It is not a library either, as extending it is not so easy. Basically, and without any intention to harm any feelings, it looks like one of those dummy web UI interface to X. And I'd say it has much more potential than that! Jacob, I must confess I'm totally confused by your comments below. I've always seen it as the beginnings of a proper stand-alone neo4j server. If it is the beginning, then what comes next? And more importantly from whom? Basically my proposal was meant to make things easier for people to built on top of it, so I'm not really sure how you see the continuation of it. A REST/JSON API to Neo4j opens up for remote clients in any language, and would be an important part in matching offerings from other database vendors. While extendability is a great thing, building it as a library and/or packaging it as a WAR makes it very java-centric. Currently the neo4j-rest is distributed as a java application. So it is java-centric. What makes it attractive is that it allows using the HTTP protocol. Providing neo4j-rest as both a self contained app and as a web app will give you exactly the same benefits, with additional freedom on choosing how to use it, what servers to deploy it too, etc. Like you say, there is no security, and I agree it is currently the main culprit stopping neo4j REST from production use. This can of course be offset with firewalling etc, but I couldn't agree more of the importance of a proper security layer. Security was used as a basic example of things that could be much easier to be added on top of the neo4j-rest if provided in a simpler format. As you probably know already firewalls will give you at most a very basic sort of authentication, but nothing else. As far as UI interface to X goes, the area to focus on I think is the JSON part of the API. With that, a UI can be built in any language. Take a look at http://github.com/neo4j/webadmin for a more powerful browsing UI for neo4j REST. I think you mis-read my post. I'm not looking for a nice UI, but rather for a basis to further build REST services on top of a neo4j db. As Jim mentioned in his posts, currently neo4j-rest is just exposing the basics of a neo4j db. :- alex However the notion of just letting end users write their own code hadn't occurred at least to me. I guess I always assumed that if users really wanted a domain specific API then they'd write their own. But the notion of user-registered filters (at least) is pretty sensible. I think your initial assumption makes a lot of sense. But why would one have to duplicate all the work when this could provide him not only with a good example, but a common basis for a complete solution. I'm looking at it from the perspective of a DB vizualization tool: what's in there offers you the default view. Next you could build your own views, etc. You could even build your complete application using it. Best thing is that I don't even think it is difficult to get it being more a matter of packaging than anything else. All would be needed: - a web.xml file with some configuration options in it (db location) - providing better access to the GraphDatabaseService (see my previous suggestion) and other common shared resources (IndexService, etc) - a different final package in form of a war - done Does it make sense to you? :- alex Jim ___ 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 -- Jacob Hansson Phone: +46 (0) 763503395 Twitter: @jakewins ___ Neo4j
Re: [Neo4j] Timeline class in Neo Index
2010/8/14 Rick Bullotta rick.bullo...@burningskysoftware.com Hi, all. Has anyone used the Timeline capabilities for a searchable set of timestamped nodes? I was about to write my own custom linked list implementation using relationships w/a timestamp property, and came across this. I have a need to handle queries similar to those provided by the TimelineIndex with a few additions: - I want to be able to limit the # of nodes retrieved to a maximum of n It's just a matter of iterating over n nodes... the iterating is done lazily anyway. - I need to be able to retrieve nodes either in increasing timestamp or decreasing timestamp order That could be an easy patch... look into the code and see if that can be done in an easy way! I was planning on either building a new set of classes based on Timeline, extending Timeline, or starting from scratch. Any insights/suggestions welcomed. Best, Rick ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] neo4j REST server configuration
Is this resolved? Take a look at http://wiki.neo4j.org/content/Getting_Started_REST#Configure_amount_of_memoryotherwise 2010/8/7 Mohit Vazirani mohi...@yahoo.com Hi, I'm running the standalone neo4j REST server on a 64 bit linux machine with 64GB RAM and am trying to configure the following memory settings through the wrapper.conf file: wrapper.java.initmemory=16144 wrapper.java.maxmemory=16144 However when I restart the server, JMX shows me the following VM arguments: -Dcom.sun.management.jmxremote -Xms4096m -Xmx4096m -Djava.library.path=lib -Dwrapper.key=q8W6vP8LS9mj0ekz -Dwrapper.port=32000 -Dwrapper.jvm.port.min=31000 -Dwrapper.jvm.port.max=31999 -Dwrapper.pid=27943 -Dwrapper.version=3.2.3 -Dwrapper.native_library=wrapper -Dwrapper.service=TRUE -Dwrapper.cpu.timeout=10 -Dwrapper.jvmid=1 Another unrelated issue is that JMX Mbeans shows configuration attributes as unavailable when I attach to the REST wrapper. The reason I am looking into modifying the configuration is that my client servers seem to be timing out. The server cannot handle more than 5 concurrent transactions, so I want to tweak the heap size and see if that helps. Thanks, ~Mohit ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Timeline class in Neo Index
Hi, Mattias.
I ended up writing some logic in our domain objects to handle this.
Basically we keep the timestamp nodes in buckets for rapid traversal
to the closest nodes for a given time range (on an hourly or daily
bucket), then within each bucket the nodes are managed via a first
and last relationship from the bucket node, and next relationships
from the time series data nodes. Since 99.9% of insertion is at the
end of the list, linear searches for insertion are fairly rare. Thanks
to the ability of Neo to traverse a relationship in either direction,
we were able to implement a doubly linked list without double
links. ;-) This allowed us to rapidly retrieve data in ascending
(oldest) or descending (newest) order without requiring post-processing
to sort the data.
In any case, performance seems really good.
Best,
Rick
Original Message
Subject: Re: [Neo4j] Timeline class in Neo Index
From: Mattias Persson [1]matt...@neotechnology.com
Date: Tue, September 14, 2010 4:58 am
To: Neo4j user discussions [2]u...@lists.neo4j.org
2010/8/14 Rick Bullotta [3]rick.bullo...@burningskysoftware.com
Hi, all.
Has anyone used the Timeline capabilities for a searchable set of
timestamped nodes? I was about to write my own custom linked list
implementation using relationships w/a timestamp property, and came
across
this. I have a need to handle queries similar to those provided by
the
TimelineIndex with a few additions:
- I want to be able to limit the # of nodes retrieved to a maximum
of n
It's just a matter of iterating over n nodes... the iterating is done
lazily anyway.
- I need to be able to retrieve nodes either in increasing
timestamp or decreasing timestamp order
That could be an easy patch... look into the code and see if that can
be
done in an easy way!
I was planning on either building a new set of classes based on
Timeline,
extending Timeline, or starting from scratch. Any
insights/suggestions
welcomed.
Best,
Rick
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Mattias Persson, [[6]matt...@neotechnology.com]
Hacker, Neo Technology
[7]www.neotechnology.com
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References
1. mailto:matt...@neotechnology.com
2. mailto:user@lists.neo4j.org
3. mailto:rick.bullo...@burningskysoftware.com
4. mailto:User@lists.neo4j.org
5. https://lists.neo4j.org/mailman/listinfo/user
6. mailto:matt...@neotechnology.com
7. http://www.neotechnology.com/
8. mailto:User@lists.neo4j.org
9. https://lists.neo4j.org/mailman/listinfo/user
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Re: [Neo4j] GeoTools and Neo4j
Thanks for the information Peter. In regards to updating to 2.7, I want to make sure that the Neo4j Geotools (gt) Datastore works with 2.7 onwards to ensure compatibility with all of the GeoScripts http://geoscript.org/ and Geo.cljhttp://github.com/iwillig/geo.clj. These, I think, are the future of GeoTools. I make changes in my fork and later worry about pushing back to the main project later. Anyway, back to real work:). Ivan Willig On Mon, Sep 13, 2010 at 2:59 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Ivan, welcome to Neo4j! Answers (or attempts to) inline: On Mon, Sep 13, 2010 at 6:07 PM, Ivan Willig iwil...@gmail.com wrote: Hi list, I was playing around with Neo4j spatial stuff over the weekend and noticed we are using GeoTools 2.6. GeoTools is moving to release 2.7 and I think its worth the time to update Neo4jSpatialDataStore. Right now I am running into this http://paste.pocoo.org/show/261438/ issue right now while using GeoTools 2.7. I can do some digging after work hours, but I am not sure how much time I can devote to this. Well, welcome to fork away and contribute! I think upgrading should not be a big issue if you know what changed in GeoTools 2.7. I think the main reason behind this is that uDig is at GeoTools 2.7, but I might be wrong. Craig? Before merging, let's make sure you get the CLA into place, http://wiki.neo4j.org/content/About_Contributor_License_Agreement Couple of questions, should we move to GeoTools trunk? Has someone already started this? Is there a maintainer of the GeoTools datastore? Lastly, where can I find the list of all of the issues regrading the spatial component of neo4j? I am looking to help out more. We have started to talk to the GeoTools guys, but need to review their code contribution guidelines more carefully before being able to fill them in. Otherwise, it would be great to have a maintainer over there to take care of at least a thin adapter pulling in the Neo4j-Spatial artifacts. We are maintaining a list of issues (or just the beginning of one) at http://github.com/neo4j/neo4j-spatial/issues . Feel free to comment and contribute - all ideas are welcome! /peter ___ 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] GeoTools and Neo4j
uDig 1.2 is on Geotools 2.6, but Jody tells me that he got it working on Geotools 2.7 last week (so we should see a 1.2.1 soon), and so a move of Neo4j to the new Geotools should be a good move to make. I don't have time to look at this myself right now, but you are certainly more than welcome to make the move and send a pull request :-) On Tue, Sep 14, 2010 at 4:36 PM, Ivan Willig iwil...@gmail.com wrote: Thanks for the information Peter. In regards to updating to 2.7, I want to make sure that the Neo4j Geotools (gt) Datastore works with 2.7 onwards to ensure compatibility with all of the GeoScripts http://geoscript.org/ and Geo.cljhttp://github.com/iwillig/geo.clj. These, I think, are the future of GeoTools. I make changes in my fork and later worry about pushing back to the main project later. Anyway, back to real work:). Ivan Willig On Mon, Sep 13, 2010 at 2:59 PM, Peter Neubauer peter.neuba...@neotechnology.com wrote: Ivan, welcome to Neo4j! Answers (or attempts to) inline: On Mon, Sep 13, 2010 at 6:07 PM, Ivan Willig iwil...@gmail.com wrote: Hi list, I was playing around with Neo4j spatial stuff over the weekend and noticed we are using GeoTools 2.6. GeoTools is moving to release 2.7 and I think its worth the time to update Neo4jSpatialDataStore. Right now I am running into this http://paste.pocoo.org/show/261438/ issue right now while using GeoTools 2.7. I can do some digging after work hours, but I am not sure how much time I can devote to this. Well, welcome to fork away and contribute! I think upgrading should not be a big issue if you know what changed in GeoTools 2.7. I think the main reason behind this is that uDig is at GeoTools 2.7, but I might be wrong. Craig? Before merging, let's make sure you get the CLA into place, http://wiki.neo4j.org/content/About_Contributor_License_Agreement Couple of questions, should we move to GeoTools trunk? Has someone already started this? Is there a maintainer of the GeoTools datastore? Lastly, where can I find the list of all of the issues regrading the spatial component of neo4j? I am looking to help out more. We have started to talk to the GeoTools guys, but need to review their code contribution guidelines more carefully before being able to fill them in. Otherwise, it would be great to have a maintainer over there to take care of at least a thin adapter pulling in the Neo4j-Spatial artifacts. We are maintaining a list of issues (or just the beginning of one) at http://github.com/neo4j/neo4j-spatial/issues . Feel free to comment and contribute - all ideas are welcome! /peter ___ 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] Relationship Check During Traversal
Hi ,
I'm trying to setup a Traversal in a time dependant graph
with multiple weighted connections between nodes representing
minutes. I want to only traverse the first relationship with a
value greater than the weight of the traversal's current position.
i.e if the path.weight()=100 only traverse the first relationship
with a departure time property =100
I have implemented a modified BranchSelector to identify the next
relationship to traverse depending on the path weight. But once i have
identified this relationship in BranchSelector.next(), how can
I return a new TraversalBranch using this node.
As i see the TraversalBranch is created in ExpansionSourceImpl using:
TraversalBranch next = new ExpansionSourceImpl( traverser, this,
depth + 1, node,traverser.description.expander, relationship );
Would I need to create a modified ExpansionSourceImpl?
Please let me know if i am going down the right path :-/
thanks
Paddy
On Sat, Sep 11, 2010 at 1:51 PM, Paddy paddyf...@gmail.com wrote:
Hi David,
Thanks for your help, I got it working using the following code. I tested
it on a small graph with the neo4j java-dijkstra example and it works :)
Cheers
Paddy
public static PruneEvaluator pruneAfterTransfer()
{
return new PruneEvaluator()
{
public boolean pruneAfter( Path path )
{
System.out.println(path + path);
int count=0;
if(path.lastRelationship().isType(RelationshipTypes.TRANSFER))
{
IterableRelationship relationships =
path.relationships();
for(Relationship relationship : relationships)
{
if(relationship.isType(RelationshipTypes.TRANSFER))
{
if (++count == 2) {
System.out.println(Breaking!!);
return true;
}
}
}
}
return false;
}
};
}
PruneEvaluator prunerAfterTransfer = pruneAfterTransfer();
private static final TraversalDescription TRAVERSAL =
Traversal.description().uniqueness(
Uniqueness.NONE ).prune(pruneAfterTransfer());
On Fri, Sep 10, 2010 at 10:11 PM, David Montag
david.mon...@neotechnology.com wrote:
Hi Paddy,
One idea is to prune the traversal by looking at whether the path so far
already has a transfer relationship or not. You would then do some kind of
filtering of the resulting paths, e.g. only accepting those with correct
end
nodes. I don't know if the computational complexity of this is acceptable
or
not though.
And I don't know if this answer was relevant or not. I hope it was :)
David
On Sat, Sep 11, 2010 at 4:09 AM, Paddy paddyf...@gmail.com wrote:
Hi just a quick question regarding the use of the PruneEvaluator
I was wondering what would be the best way to modify the
TraversalDescription in the Dijkstra
algorithm in order to prune a traversal when a branch has reached a
second
transfer relationship.
I want to avoid multiple transfers in a bus network.
If the graph is arranged as:
(stop:1) --bus (stop:2) --transfer (stop:3) --bus (stop:4) --transfer
(stop:5)
Is it possible to prune the traversal branch when the 2nd transfer
relationship is reached after (stop:4)
Could this be achieved using a PruneEvaluator? Or am I approaching this
the
wrong way?
thanks
Paddy
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