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TestConcurrentRotation.java
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TestConcurrentRotation.java
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/*
* Copyright (c) 2002-2015 "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 synchronization;
import org.apache.lucene.index.IndexWriter;
import org.junit.Test;
import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.helpers.Exceptions;
import org.neo4j.kernel.GraphDatabaseAPI;
import org.neo4j.kernel.impl.transaction.log.checkpoint.CheckPointer;
import org.neo4j.kernel.impl.transaction.log.checkpoint.SimpleTriggerInfo;
import org.neo4j.test.AbstractSubProcessTestBase;
import org.neo4j.test.subprocess.BreakPoint;
import org.neo4j.test.subprocess.DebugInterface;
import org.neo4j.test.subprocess.DebuggedThread;
import org.neo4j.test.subprocess.KillSubProcess;
import static org.junit.Assert.assertTrue;
public class TestConcurrentRotation extends AbstractSubProcessTestBase
{
private final CountDownLatch barrier1 = new CountDownLatch( 1 ), barrier2 = new CountDownLatch( 1 );
private DebuggedThread thread;
private final BreakPoint commitIndexWriter = new BreakPoint( IndexWriter.class, "commit" )
{
private int counter = 0;
@Override
protected void callback( DebugInterface debug ) throws KillSubProcess
{
if ( counter++ > 0 )
{
return;
}
thread = debug.thread().suspend( this );
this.disable();
barrier1.countDown();
}
};
private final BreakPoint resumeFlushThread = new BreakPoint( TestConcurrentRotation.class, "resumeFlushThread" )
{
@Override
protected void callback( DebugInterface debug ) throws KillSubProcess
{
thread.resume();
this.disable();
}
};
private final BreakPoint done = new BreakPoint( TestConcurrentRotation.class, "checkPointDone" )
{
@Override
protected void callback( DebugInterface debug ) throws KillSubProcess
{
this.disable();
barrier2.countDown();
}
};
static void resumeFlushThread()
{ // Activates breakpoint
}
static void checkPointDone()
{ // Activate breakpoint
}
@Override
protected BreakPoint[] breakpoints( int id )
{
return new BreakPoint[] { commitIndexWriter, resumeFlushThread.enable(), done.enable() };
}
@Test
public void rotateLogAtTheSameTimeInitializeIndexWriters() throws Exception
{
run( new CreateInitialStateTask() );
restart();
commitIndexWriter.enable();
run( new LoadIndexesTask( 2, false ) );
RotateIndexLogTask rotateTask = new RotateIndexLogTask();
runInThread( rotateTask );
barrier1.await();
run( new LoadIndexesTask( 3, true ) );
resumeFlushThread();
barrier2.await();
run( new Verifier() );
}
private static class Verifier implements Task
{
@Override
public void run( GraphDatabaseAPI graphdb )
{
try(Transaction ignored = graphdb.beginTx())
{
// TODO: Pass a node reference around of assuming the id will be deterministically assigned,
// artifact of removing the reference node, upon which this test used to depend.
assertTrue( (Boolean) graphdb.getNodeById(3).getProperty( "success" ) );
}
}
}
private static class CreateInitialStateTask implements Task
{
@Override
public void run( GraphDatabaseAPI graphdb )
{
try(Transaction tx = graphdb.beginTx())
{
for ( int i = 0; i < 3; i++ )
{
graphdb.index().forNodes( "index" + i ).add( graphdb.createNode(), "name", "" + i );
}
tx.success();
}
}
}
private static class LoadIndexesTask implements Task
{
private final int count;
private final boolean resume;
public LoadIndexesTask( int count, boolean resume )
{
this.count = count;
this.resume = resume;
}
@Override
public void run( GraphDatabaseAPI graphdb )
{
try(Transaction ignored = graphdb.beginTx())
{
for ( int i = 0; i < count; i++ )
{
graphdb.index().forNodes( "index" + i ).get( "name", i ).getSingle();
}
}
if ( resume )
{
resumeFlushThread();
}
}
}
private static class RotateIndexLogTask implements Task
{
@Override
public void run( GraphDatabaseAPI graphdb )
{
try
{
checkPoint( graphdb );
setSuccess( graphdb, true );
}
catch ( Exception e )
{
setSuccess( graphdb, false );
throw Exceptions.launderedException( e );
}
finally
{
checkPointDone();
}
}
private void checkPoint( GraphDatabaseAPI graphdb ) throws IOException
{
graphdb.getDependencyResolver().resolveDependency( CheckPointer.class ).forceCheckPoint(
new SimpleTriggerInfo( "test" )
);
}
private void setSuccess( GraphDatabaseAPI graphdb, boolean success )
{
try(Transaction tx = graphdb.beginTx())
{
Node node = graphdb.createNode();
node.setProperty( "success", success );
tx.success();
}
}
}
}