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ManualAcquireLockTest.java
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ManualAcquireLockTest.java
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/*
* Copyright (c) 2002-2016 "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.impl.transaction;
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.RuleChain;
import org.junit.rules.TestRule;
import java.util.concurrent.ExecutionException;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Lock;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.test.OtherThreadExecutor;
import org.neo4j.test.rule.DatabaseRule;
import org.neo4j.test.rule.GraphTransactionRule;
import org.neo4j.test.rule.ImpermanentDatabaseRule;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static org.junit.Assert.fail;
public class ManualAcquireLockTest
{
public DatabaseRule db = new ImpermanentDatabaseRule( );
public GraphTransactionRule tx = new GraphTransactionRule( db );
@Rule public TestRule chain = RuleChain.outerRule( db ).around( tx );
private Worker worker;
@Before
public void doBefore() throws Exception
{
worker = new Worker();
}
@After
public void doAfter() throws Exception
{
worker.close();
}
@Test
public void releaseReleaseManually() throws Exception
{
String key = "name";
Node node = getGraphDb().createNode();
tx.success();
Transaction current = tx.begin();
Lock nodeLock = current.acquireWriteLock( node );
worker.beginTx();
try
{
worker.setProperty( node, key, "ksjd" );
fail( "Shouldn't be able to grab it" );
}
catch ( Exception ignored )
{
}
nodeLock.release();
worker.setProperty( node, key, "yo" );
try
{
worker.finishTx();
}
catch(ExecutionException e)
{
// Ok, interrupting the thread while it's waiting for a lock will lead to tx failure.
}
}
@Test
public void canOnlyReleaseOnce() throws Exception
{
Node node = getGraphDb().createNode();
tx.success();
Transaction current = tx.begin();
Lock nodeLock = current.acquireWriteLock( node );
nodeLock.release();
try
{
nodeLock.release();
fail( "Shouldn't be able to release more than once" );
}
catch ( IllegalStateException e )
{ // Good
}
}
@Test
public void makeSureNodeStaysLockedEvenAfterManualRelease() throws Exception
{
String key = "name";
Node node = getGraphDb().createNode();
tx.success();
Transaction current = tx.begin();
Lock nodeLock = current.acquireWriteLock( node );
node.setProperty( key, "value" );
nodeLock.release();
worker.beginTx();
try
{
worker.setProperty( node, key, "ksjd" );
fail( "Shouldn't be able to grab it" );
}
catch ( Exception e )
{
// e.printStackTrace();
}
tx.success();
try
{
worker.finishTx();
}
catch(ExecutionException e)
{
// Ok, interrupting the thread while it's waiting for a lock will lead to tx failure.
}
}
private GraphDatabaseService getGraphDb()
{
return db.getGraphDatabaseAPI();
}
private class State
{
private final GraphDatabaseService graphDb;
private Transaction tx;
public State( GraphDatabaseService graphDb )
{
this.graphDb = graphDb;
}
}
private class Worker extends OtherThreadExecutor<State>
{
public Worker()
{
super( "other thread", new State( getGraphDb() ) );
}
void beginTx() throws Exception
{
execute( new WorkerCommand<State, Void>()
{
@Override
public Void doWork( State state )
{
state.tx = state.graphDb.beginTx();
return null;
}
} );
}
void finishTx() throws Exception
{
execute( new WorkerCommand<State, Void>()
{
@Override
public Void doWork( State state )
{
state.tx.success();
state.tx.close();
return null;
}
} );
}
void setProperty( final Node node, final String key, final Object value ) throws Exception
{
execute( new WorkerCommand<State, Object>()
{
@Override
public Object doWork( State state )
{
node.setProperty( key, value );
return null;
}
}, 200, MILLISECONDS );
}
}
}