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DataCreator.java
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DataCreator.java
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/*
* Copyright (c) 2002-2018 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.causalclustering.helpers;
import java.util.function.Supplier;
import org.neo4j.causalclustering.core.CoreGraphDatabase;
import org.neo4j.causalclustering.discovery.Cluster;
import org.neo4j.causalclustering.discovery.CoreClusterMember;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.helpers.collection.Pair;
import static org.neo4j.helpers.collection.Iterables.count;
public class DataCreator
{
private DataCreator()
{
}
public static CoreClusterMember createLabelledNodesWithProperty( Cluster cluster, int numberOfNodes,
Label label, Supplier<Pair<String,Object>> propertyPair ) throws Exception
{
CoreClusterMember last = null;
for ( int i = 0; i < numberOfNodes; i++ )
{
last = cluster.coreTx( ( db, tx ) ->
{
Node node = db.createNode( label );
node.setProperty( propertyPair.get().first(), propertyPair.get().other() );
tx.success();
} );
}
return last;
}
public static CoreClusterMember createEmptyNodes( Cluster cluster, int numberOfNodes ) throws Exception
{
CoreClusterMember last = null;
for ( int i = 0; i < numberOfNodes; i++ )
{
last = cluster.coreTx( ( db, tx ) ->
{
db.createNode();
tx.success();
} );
}
return last;
}
public static long countNodes( CoreClusterMember member )
{
CoreGraphDatabase db = member.database();
long count;
try ( Transaction tx = db.beginTx() )
{
count = count( db.getAllNodes() );
tx.success();
}
return count;
}
}