Sample Event Listener / Triggers

1. Build it:

    mvn clean package
   

2. Copy target/triggers-1.0.jar to the plugins/ directory of your Neo4j server.

3. Start your Neo4j Server

4. Run these queries, tailing the graph.db/log/debug.log file:

    CREATE (max:User {name:"Max"}) RETURN max;
   
    CREATE (al:Suspect {name:"Al Capone"}) RETURN al;
   
    MATCH (max:User),(al:Suspect)
    WHERE max.name = "Max" AND al.name = "Al Capone"
    CREATE (max)-[r:KNOWS]->(al)
    RETURN r;
   
    CREATE (monica:User {name:"Monica"}) RETURN monica;
   
    MATCH (max:User),(monica:User)
    WHERE max.name = "Max" AND monica.name = "Monica"
    CREATE (max)-[r:KNOWS]->(monica)
    RETURN r;
   
    MATCH (monica:User)
    WHERE monica.name = "Monica"
    SET monica :Suspect
    RETURN monica;
   

5. You should see:

    A new Suspect has been created!
    A new direct relationship to a Suspect has been created!
    A new indirect relationship to a Suspect has been created!
    A new Suspect has been identified!