Neo4j TimeTree in Spring Data Neo4j 4.0

Question

I\'m trying to utilize the timetree library in my spring data neo4j 4.0.0 project.

As elaborated in this page, https://github.com/graphaware/neo4j-timetree, I\'ve e

Answer 1

Defining the possible labels for the TimeTree has a little different syntax as explained in the InclusionPolicy documentation https://github.com/graphaware/neo4j-framework/tree/master/common#inclusion-policies

The syntax is the following :

com.graphaware.module.TT.event=hasLabel('StructureVersionChange')||hasLabel('RuleVersionChange')||hasLabel('FilterVersionChange')

For debugging purposes you may want to add these lines to your conf/custom-logback.xml file :

<appender name="EXTENSIONLOG"  class="ch.qos.logback.core.FileAppender">
  <file>data/log/extensions.log</file>
  <encoder>
      <pattern>%date{yyyy-MM-dd HH:mm:ss.SSSZ} %-5level [%logger{15}]: %message%n</pattern>
  </encoder>
</appender>

<logger name="com.graphaware" level="debug">
  <appender-ref ref="EXTENSIONLOG"/>
</logger>

and look at the extensions.log file

Answer 2

The dependency is only useful if you're using the timetree programatically. If your application is running against a Neo4j server, then you need to download and save to your Neo4j server plugins directory:

a) The GraphAware framework (choose either Community or Enterprise)

b) The TimeTree module

Both can be downloaded from http://graphaware.com/products/

Without this, even with a configuration in neo4j.properties, the GraphAware Runtime isn't started and the timetree will not work.

If you want to run your code via a test, then you need to include the dependencies for the TimeTree and GraphAware Runtime and start the GraphAware Runtime yourself, with code such as:

 GraphAwareRuntime runtime = GraphAwareRuntimeFactory.createRuntime(getDatabase());
        runtime.registerModule(new TimeTreeModule("timetree",
                TimeTreeConfiguration
                        .defaultConfiguration()
                        .with(new NodeInclusionPolicy() {
                            @Override
                            public boolean include(Node node) {
                                return node.hasLabel(DynamicLabel.label("User"));
                            }
                        })

                        })
                        .withRelationshipType(DynamicRelationshipType.withName("CREATED_ON"))
                        .withTimeZone(DateTimeZone.forTimeZone(TimeZone.getTimeZone("GMT+1")))
                        .withTimestampProperty("createdOn")
                        .withResolution(Resolution.DAY)
                ,
                getDatabase()));
        runtime.start();

Then you can write tests such as

 @Test
    public void shouldSaveUser()
    {
        User user = new User( "Michal" );
        user.setCreatedOn(1431937636995l);
        userRepository.save( user );

        assertSameGraph( getDatabase(), "CREATE (u:User:Person {name:'Michal', createdOn:1431937636995})," +
                "(root:TimeTreeRoot)," +
                        "(root)-[:FIRST]->(year:Year {value:2015})," +
                        "(root)-[:CHILD]->(year)," +
                        "(root)-[:LAST]->(year)," +
                        "(year)-[:FIRST]->(month:Month {value:5})," +
                        "(year)-[:CHILD]->(month)," +
                        "(year)-[:LAST]->(month)," +
                        "(month)-[:FIRST]->(day:Day {value:18})," +
                        "(month)-[:CHILD]->(day)," +
                        "(month)-[:LAST]->(day)," +
                        "(day)<-[:CREATED_ON]-(u)"
        );

    }