/
EmbeddedNeo4jWithIndexing.java
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EmbeddedNeo4jWithIndexing.java
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/*
* Licensed to Neo Technology under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Neo Technology licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.neo4j.examples;
import java.io.File;
import java.io.IOException;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.graphdb.index.Index;
import org.neo4j.io.fs.FileUtils;
public class EmbeddedNeo4jWithIndexing
{
private static final String DB_PATH = "target/neo4j-store";
private static final String USERNAME_KEY = "username";
private static GraphDatabaseService graphDb;
private static Index<Node> nodeIndex;
public static void main( final String[] args ) throws IOException
{
FileUtils.deleteRecursively( new File( DB_PATH ) );
// START SNIPPET: startDb
graphDb = new GraphDatabaseFactory().newEmbeddedDatabase( DB_PATH );
registerShutdownHook();
// END SNIPPET: startDb
// START SNIPPET: addUsers
try ( Transaction tx = graphDb.beginTx() )
{
nodeIndex = graphDb.index().forNodes( "nodes" );
// Create some users and index their names with the IndexService
for ( int id = 0; id < 100; id++ )
{
createAndIndexUser( idToUserName( id ) );
}
// END SNIPPET: addUsers
// Find a user through the search index
// START SNIPPET: findUser
int idToFind = 45;
String userName = idToUserName( idToFind );
Node foundUser = nodeIndex.get( USERNAME_KEY, userName ).getSingle();
System.out.println( "The username of user " + idToFind + " is "
+ foundUser.getProperty( USERNAME_KEY ) );
// END SNIPPET: findUser
// Delete the persons and remove them from the index
for ( Node user : nodeIndex.query( USERNAME_KEY, "*" ) )
{
nodeIndex.remove( user, USERNAME_KEY,
user.getProperty( USERNAME_KEY ) );
user.delete();
}
tx.success();
}
shutdown();
}
private static void shutdown()
{
graphDb.shutdown();
}
// START SNIPPET: helperMethods
private static String idToUserName( final int id )
{
return "user" + id + "@neo4j.org";
}
private static Node createAndIndexUser( final String username )
{
Node node = graphDb.createNode();
node.setProperty( USERNAME_KEY, username );
nodeIndex.add( node, USERNAME_KEY, username );
return node;
}
// END SNIPPET: helperMethods
private static void registerShutdownHook()
{
// Registers a shutdown hook for the Neo4j and index service instances
// so that it shuts down nicely when the VM exits (even if you
// "Ctrl-C" the running example before it's completed)
Runtime.getRuntime().addShutdownHook( new Thread()
{
@Override
public void run()
{
shutdown();
}
} );
}
}