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TransactionStateMachineSPITest.java
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TransactionStateMachineSPITest.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 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.bolt.v1.runtime;
import org.junit.Rule;
import org.junit.Test;
import java.time.Clock;
import java.time.Duration;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.function.Supplier;
import org.neo4j.graphdb.DependencyResolver;
import org.neo4j.kernel.AvailabilityGuard;
import org.neo4j.kernel.GraphDatabaseQueryService;
import org.neo4j.internal.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.impl.core.ThreadToStatementContextBridge;
import org.neo4j.kernel.impl.query.QueryExecutionEngine;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import org.neo4j.kernel.internal.GraphDatabaseAPI;
import org.neo4j.logging.NullLog;
import org.neo4j.test.rule.concurrent.OtherThreadRule;
import org.neo4j.time.FakeClock;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.hamcrest.Matchers.instanceOf;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertThat;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.when;
public class TransactionStateMachineSPITest
{
@Rule
public final OtherThreadRule<Void> otherThread = new OtherThreadRule<>();
@Test
public void throwsWhenTxAwaitDurationExpires()
{
long lastClosedTransactionId = 100;
Supplier<TransactionIdStore> txIdStore = () -> fixedTxIdStore( lastClosedTransactionId );
Duration txAwaitDuration = Duration.ofSeconds( 42 );
FakeClock clock = new FakeClock();
AvailabilityGuard availabilityGuard = spy( new AvailabilityGuard( clock, NullLog.getInstance() ) );
when( availabilityGuard.isAvailable() ).then( invocation ->
{
// move clock forward on the first availability check
// this check is executed on every tx id polling iteration
boolean available = (boolean) invocation.callRealMethod();
clock.forward( txAwaitDuration.getSeconds() + 1, SECONDS );
return available;
} );
TransactionStateMachineSPI txSpi = createTxSpi( txIdStore, txAwaitDuration, availabilityGuard, clock );
Future<Void> result = otherThread.execute( state ->
{
txSpi.awaitUpToDate( lastClosedTransactionId + 42 );
return null;
} );
try
{
result.get( 20, SECONDS );
}
catch ( Exception e )
{
assertThat( e, instanceOf( ExecutionException.class ) );
assertThat( e.getCause(), instanceOf( TransactionFailureException.class ) );
}
}
@Test
public void doesNotWaitWhenTxIdUpToDate() throws Exception
{
long lastClosedTransactionId = 100;
Supplier<TransactionIdStore> txIdStore = () -> fixedTxIdStore( lastClosedTransactionId );
TransactionStateMachineSPI txSpi = createTxSpi( txIdStore, Duration.ZERO, Clock.systemUTC() );
Future<Void> result = otherThread.execute( state ->
{
txSpi.awaitUpToDate( lastClosedTransactionId - 42 );
return null;
} );
assertNull( result.get( 20, SECONDS ) );
}
private static TransactionIdStore fixedTxIdStore( long lastClosedTransactionId )
{
TransactionIdStore txIdStore = mock( TransactionIdStore.class );
when( txIdStore.getLastClosedTransactionId() ).thenReturn( lastClosedTransactionId );
return txIdStore;
}
private static TransactionStateMachineSPI createTxSpi( Supplier<TransactionIdStore> txIdStore, Duration txAwaitDuration,
Clock clock )
{
AvailabilityGuard availabilityGuard = new AvailabilityGuard( clock, NullLog.getInstance() );
return createTxSpi( txIdStore, txAwaitDuration, availabilityGuard, clock );
}
private static TransactionStateMachineSPI createTxSpi( Supplier<TransactionIdStore> txIdStore, Duration txAwaitDuration,
AvailabilityGuard availabilityGuard, Clock clock )
{
GraphDatabaseQueryService queryService = mock( GraphDatabaseQueryService.class );
DependencyResolver dependencyResolver = mock( DependencyResolver.class );
GraphDatabaseAPI db = mock( GraphDatabaseAPI.class );
when( queryService.getDependencyResolver() ).thenReturn( dependencyResolver );
when( db.getDependencyResolver() ).thenReturn( dependencyResolver );
when(dependencyResolver.provideDependency( TransactionIdStore.class )).thenReturn( txIdStore );
return new TransactionStateMachineSPI( db, new ThreadToStatementContextBridge(),
mock( QueryExecutionEngine.class ), availabilityGuard, queryService, txAwaitDuration,
clock );
}
}