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KernelTransactionsTest.java
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KernelTransactionsTest.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.api;
import org.junit.Test;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;
import java.util.Collection;
import java.util.function.Supplier;
import org.neo4j.kernel.api.KernelTransaction;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.impl.proc.Procedures;
import org.neo4j.kernel.impl.api.store.StoreStatement;
import org.neo4j.kernel.impl.locking.Locks;
import org.neo4j.kernel.impl.locking.ReentrantLockService;
import org.neo4j.kernel.impl.store.MetaDataStore;
import org.neo4j.kernel.impl.store.NeoStores;
import org.neo4j.kernel.impl.transaction.TransactionHeaderInformationFactory;
import org.neo4j.kernel.impl.transaction.TransactionMonitor;
import org.neo4j.kernel.impl.transaction.TransactionRepresentation;
import org.neo4j.kernel.impl.transaction.tracing.CommitEvent;
import org.neo4j.kernel.impl.util.JobScheduler;
import org.neo4j.kernel.lifecycle.LifeSupport;
import org.neo4j.kernel.monitoring.Monitors;
import org.neo4j.kernel.monitoring.tracing.Tracers;
import org.neo4j.logging.NullLog;
import org.neo4j.storageengine.api.StorageCommand;
import org.neo4j.storageengine.api.StorageEngine;
import org.neo4j.storageengine.api.StoreReadLayer;
import org.neo4j.storageengine.api.TransactionApplicationMode;
import org.neo4j.storageengine.api.lock.ResourceLocker;
import org.neo4j.storageengine.api.txstate.ReadableTransactionState;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.instanceOf;
import static org.hamcrest.CoreMatchers.not;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import static org.mockito.Matchers.any;
import static org.mockito.Matchers.anyCollection;
import static org.mockito.Matchers.anyLong;
import static org.mockito.Mockito.doAnswer;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import static org.neo4j.helpers.collection.IteratorUtil.asSet;
public class KernelTransactionsTest
{
@Test
public void shouldListActiveTransactions() throws Exception
{
// Given
KernelTransactions registry = newKernelTransactions();
// When
KernelTransaction first = registry.newInstance();
KernelTransaction second = registry.newInstance();
KernelTransaction third = registry.newInstance();
first.close();
// Then
assertThat( registry.activeTransactions(), equalTo( asSet( second, third ) ) );
}
@Test
public void shouldDisposeTransactionsWhenAsked() throws Exception
{
// Given
KernelTransactions registry = newKernelTransactions();
registry.disposeAll();
KernelTransaction first = registry.newInstance();
KernelTransaction second = registry.newInstance();
KernelTransaction leftOpen = registry.newInstance();
first.close();
second.close();
// When
registry.disposeAll();
// Then
KernelTransaction postDispose = registry.newInstance();
assertThat( postDispose, not( equalTo( first ) ) );
assertThat( postDispose, not( equalTo( second ) ) );
assertTrue( leftOpen.shouldBeTerminated() );
}
@Test
public void shouldIncludeRandomBytesInAdditionalHeader() throws Exception
{
// Given
TransactionRepresentation[] transactionRepresentation = new TransactionRepresentation[1];
KernelTransactions registry = newKernelTransactions( newRememberingCommitProcess( transactionRepresentation ) );
// When
try ( KernelTransaction transaction = registry.newInstance() )
{
// Just pick anything that can flag that changes have been made to this transaction
((KernelTransactionImplementation) transaction).txState().nodeDoCreate( 0 );
transaction.success();
}
// Then
byte[] additionalHeader = transactionRepresentation[0].additionalHeader();
assertNotNull( additionalHeader );
assertTrue( additionalHeader.length > 0 );
}
@Test
public void transactionCloseRemovesTxFromActiveTransactions() throws Exception
{
KernelTransactions kernelTransactions = newKernelTransactions();
KernelTransaction tx1 = kernelTransactions.newInstance();
KernelTransaction tx2 = kernelTransactions.newInstance();
KernelTransaction tx3 = kernelTransactions.newInstance();
kernelTransactions.transactionClosed( tx1 );
kernelTransactions.transactionClosed( tx3 );
assertEquals( asSet( tx2 ), kernelTransactions.activeTransactions() );
}
@Test
public void transactionRemovesItselfFromActiveTransactions() throws Exception
{
KernelTransactions kernelTransactions = newKernelTransactions();
KernelTransaction tx1 = kernelTransactions.newInstance();
KernelTransaction tx2 = kernelTransactions.newInstance();
KernelTransaction tx3 = kernelTransactions.newInstance();
tx2.close();
assertEquals( asSet( tx1, tx3 ), kernelTransactions.activeTransactions() );
}
@Test
public void exceptionIsThrownWhenUnknownTxIsClosed() throws Exception
{
KernelTransactions kernelTransactions = newKernelTransactions();
try
{
kernelTransactions.transactionClosed( mock( KernelTransactionImplementation.class ) );
fail( "Exception expected" );
}
catch ( Exception e )
{
assertThat( e, instanceOf( IllegalStateException.class ) );
}
}
@Test
public void disposeAllMarksAllTransactionsForTermination() throws Exception
{
KernelTransactions kernelTransactions = newKernelTransactions();
KernelTransaction tx1 = kernelTransactions.newInstance();
KernelTransaction tx2 = kernelTransactions.newInstance();
KernelTransaction tx3 = kernelTransactions.newInstance();
kernelTransactions.disposeAll();
assertTrue( tx1.shouldBeTerminated() );
assertTrue( tx2.shouldBeTerminated() );
assertTrue( tx3.shouldBeTerminated() );
}
private static KernelTransactions newKernelTransactions() throws Exception
{
return newKernelTransactions( mock( TransactionCommitProcess.class ) );
}
private static KernelTransactions newKernelTransactions( TransactionCommitProcess commitProcess ) throws Exception
{
LifeSupport life = new LifeSupport();
life.start();
Locks locks = mock( Locks.class );
when( locks.newClient() ).thenReturn( mock( Locks.Client.class ) );
MetaDataStore metaDataStore = mock( MetaDataStore.class );
NeoStores neoStores = mock( NeoStores.class );
StoreStatement storeStatement = new StoreStatement( neoStores, new ReentrantLockService(),
mock( Supplier.class ), null );
StoreReadLayer readLayer = mock( StoreReadLayer.class );
when( readLayer.acquireStatement() ).thenReturn( storeStatement );
StorageEngine storageEngine = mock( StorageEngine.class );
when( storageEngine.storeReadLayer() ).thenReturn( readLayer );
doAnswer( new Answer<Void>()
{
@Override
public Void answer( InvocationOnMock invocation ) throws Throwable
{
invocation.getArgumentAt( 0, Collection.class ).add( mock( StorageCommand.class ) );
return null;
}
} ).when( storageEngine ).createCommands(
anyCollection(),
any( ReadableTransactionState.class ),
any( ResourceLocker.class ),
anyLong() );
Tracers tracers =
new Tracers( "null", NullLog.getInstance(), mock( Monitors.class ), mock( JobScheduler.class ) );
return new KernelTransactions( locks,
null, null, null, TransactionHeaderInformationFactory.DEFAULT,
commitProcess, null,
null, new TransactionHooks(), mock( TransactionMonitor.class ), life,
tracers, storageEngine, new Procedures(), metaDataStore );
}
private static TransactionCommitProcess newRememberingCommitProcess( final TransactionRepresentation[] slot )
throws TransactionFailureException
{
TransactionCommitProcess commitProcess = mock( TransactionCommitProcess.class );
when( commitProcess.commit(
any( TransactionToApply.class ), any( CommitEvent.class ),
any( TransactionApplicationMode.class ) ) )
.then( invocation -> {
slot[0] = ((TransactionToApply) invocation.getArguments()[0]).transactionRepresentation();
return 1L;
} );
return commitProcess;
}
}