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TokenCreationIT.java
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TokenCreationIT.java
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/*
* Copyright (c) 2002-2017 "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 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel;
import com.google.common.collect.Sets;
import org.apache.commons.lang3.RandomStringUtils;
import org.junit.Assert;
import org.junit.Rule;
import org.junit.Test;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.LockSupport;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.test.rule.EmbeddedDatabaseRule;
import org.neo4j.test.rule.RepeatRule;
/**
* Token creation should be able to handle cases of concurrent token creation
* with different/same names. Short random interval (1-3) give a high chances of same token name in this test.
* <p>
* Newly created token should be visible only when token cache already have both mappings:
* "name -> id" and "id -> name" populated.
* Otherwise attempt to retrieve labels from newly created node can fail.
*/
public class TokenCreationIT
{
@Rule
public final EmbeddedDatabaseRule databaseRule = new EmbeddedDatabaseRule();
private volatile boolean stop = false;
@Test
@RepeatRule.Repeat( times = 5 )
public void concurrentLabelTokenCreation() throws InterruptedException
{
int concurrentWorkers = 10;
CountDownLatch latch = new CountDownLatch( concurrentWorkers );
for ( int i = 0; i < concurrentWorkers; i++ )
{
new LabelCreator( databaseRule, latch ).start();
}
LockSupport.parkNanos( TimeUnit.MILLISECONDS.toNanos( 500 ) );
stop = true;
latch.await();
}
public Label[] getLabels()
{
int randomLabelValue = ThreadLocalRandom.current().nextInt( 2 ) + 1;
Label[] labels = new Label[randomLabelValue];
for ( int i = 0; i < labels.length; i++ )
{
labels[i] = Label.label( RandomStringUtils.randomAscii( randomLabelValue ) );
}
return labels;
}
private class LabelCreator extends Thread
{
private final GraphDatabaseService database;
private final CountDownLatch createLatch;
public LabelCreator( GraphDatabaseService database, CountDownLatch createLatch )
{
this.database = database;
this.createLatch = createLatch;
}
@Override
public void run()
{
try
{
while ( !stop )
{
try ( Transaction transaction = database.beginTx() )
{
Label[] createdLabels = getLabels();
Node node = database.createNode( createdLabels );
Iterable<Label> nodeLabels = node.getLabels();
Assert.assertEquals( Sets.newHashSet( createdLabels ), Sets.newHashSet( nodeLabels ) );
transaction.success();
}
catch ( Exception e )
{
stop = true;
throw e;
}
}
}
finally
{
createLatch.countDown();
}
}
}
}