Play Neo4JPlugin

This is a simple Play 2 plugin, for NEO4J.

I got the ideas how to do it from https://github.com/tomasmuller/playframework-neo4j-template THANKS A LOT @tomasmuller for giving me the ground ideas :)

What i didn't liked that i can't call neo4j in the static way, like Ebean etc...

So here we go, i created this plugin :)

Versions

1.4.4 Remote configuration neo4j.restDB.caching=true added. When set the SpringCypherRestGraphDatabase class is used instead of SpringRestGraphDatabase. Thx at @unterstein !

1.4.3 Version lifts: play 2.3.8, neo4j 2.1.7, spring-data-neo4j 3.3.0.RC1

1.4.2 Version lifts: play 2.3.6, neo4j 2.1.5, spring-data-neo4j 3.2.1.RELEASE

1.4.1 Version lifts: play 2.3.4, neo4j 2.1.4, spring-data-neo4j 3.2.0.RELEASE and spring-context 4.1.1.RELEASE

1.4 Version lifts: play 2.3.3, neo4j 2.1.3, spring-data-neo4j 3.1.2.RELEASE and spring-context 4.0.6.RELEASE

1.3.6 Version for play 2.3. Cause of Bug: http://stackoverflow.com/questions/23997511/using-cypher-from-scala-in-embedded-databases-fails your app must compile with scala: 2.10.4

1.3.5 Fixed Scala action transaction handling by implememnting an ActionBuilder. Example is in examples/playframework-neo4j-template/app/controllers/Application.scala.

1.3.4 Lifted to new Versions: spring-data-neo4j: 3.0.2.RELEASE, play 2.2.3, neo4j 2.0.3

1.3.3 Lifted to new Versions: spring-data-neo4j: 3.0.1.RELEASE, play 2.2.2 Cause of spring-projects/spring-data-neo4j#161 there is a new config option: neo4j.basepackage="neo4j" # the base package where the entities are located : when not set the plugin defaults to neo4j

1.3.2 Lifted to new Versions: neo4j: 2.0.1 spring: 4.0.1 spring-data-neo4j: 3.0.0.RC1

1.3.1 Version which fixes tuxBurner#7 ATTENTION DONT USE VERSION 1.3.0 IT IS BROKEN DUE THIS ISSUE

1.3.0 Lifted to neo4j-2.0.0-M06, spring-data-neo4j-3.0.0.M1 and spring-context-3.2.5.RELEASE ATTENTION SEE resolver for version 1.3.0 cause of the milestone you need an extra repo

1.2.1 Lifted to neo4j 1.9.5

1.2 Lifted to play 2.2.1 and spring-data-neo4j 2.3.2.RELEASE

1.1.1: Lifted to neo4j-1.9.3 and spring-data-neo4j 2.3.1-RELEASE

1.1.0: Added controller for transactional scala

1.0.7: RestConfiguration and added AuditingEventListener

1.0.2: New Spring-Data-2.2.2 Version Dep.

Installation (using sbt)

You will need to add the following resolver in your project/Build.scala file:

resolvers += "tuxburner.github.io" at "http://tuxburner.github.io/repo"

resolvers += "Neo4j Maven Repo" at "http://m2.neo4j.org/content/repositories/releases"

!!! For Version 1.3.0 you need also to add !!!

resolvers += "Spring milestones" at "http://repo.spring.io/milestone"

Add a dependency on the following artifact:

libraryDependencies += "com.github.tuxBurner" %% "play-neo4jplugin" % "1.4.4"

!!! For Version 1.3.6/1.4.0/1.4.1/1.4.3/1.4.4 you need to change the scala version !!!

scalaVersion := "2.10.4"

Activate the plugin in the conf/play.plugins like this:

900:neo4jplugin.Neo4JPlugin

Settings for the plugin go into the conf/application.conf:

neo4j.serviceProviderClass="neo4j.services.Neo4JServiceProvider" # the provider class which holds the annotated neo4j beans
neo4j.basepackage="neo4j" # the base package where the entities are located

neo4j.mode="embedded" # mode to run embedded or remote

# embedded db config
neo4j.embeddedDB="target/neo4j-db" # where to put the embedded database

# remote db config
neo4j.restDB.host="http://localhost:7474/db/data"
neo4j.restDB.user=""
neo4j.restDB.password=""
neo4j.restDB.caching=true

Usage

All neo4j relevant stuff must go to app/neo4j/

All neo4j repositories go to app/neo4j/repositories/

You need a class which must extend from neo4jplugin.ServiceProvider and must be configured in the application.conf under the key neo4j.serviceProviderClass:

Example:

    @Component
    public class Neo4JServiceProvider extends ServiceProvider {

      @Autowired
      public NeoUserRepository neoUserRepository;

      public static Neo4JServiceProvider get() {
        return Neo4JPlugin.get();
      }
}

To access your repository you can call: Neo4JServiceProvider.get().neoUserRepository.<do magic neo4j stuff>

To access the neo4jtemplate you can call: Neo4JServiceProvider.get().template.<do magic neo4j stuff>

Transactions

There is also a @Transactional annotation which I addopted from the play jpa plugin.

Just annotate your Result with it and it runs in a neo4j Transaction.

Example Java:

  @Transactional
  public static Result doSomethingInTransaction(Long id) {
    Neo4JServiceProvider.get().neoUserRepository.<do magic neo4j stuff>
    Neo4JServiceProvider.get().neoUserRepository.<do magic neo4j stuff>

    return ok("Woohhoh Neo4jTransaction");
  }

For Scala i used the Actionbuilder pattern described at: http://www.playframework.com/documentation/2.2.x/ScalaActionsComposition This allows you to combine several actions.

Example Scala:

  def index = Neo4jTransactionAction {
    Neo4JServiceProvider.get().neoUserRepository.<do magic neo4j stuff>
    Neo4JServiceProvider.get().neoUserRepository.<do magic neo4j stuff>

    Ok("Woohhoh Neo4jTransaction")
  }

Take a look into the examples

TODO