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TransactionIdTrackerTest.java
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TransactionIdTrackerTest.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.bolt.v1.runtime.internal;
import org.junit.Test;
import org.neo4j.kernel.api.exceptions.TransactionFailureException;
import org.neo4j.kernel.impl.transaction.log.TransactionIdStore;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.junit.Assert.fail;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
import static org.neo4j.kernel.impl.transaction.log.TransactionIdStore.BASE_TX_ID;
public class TransactionIdTrackerTest
{
private final TransactionIdStore transactionIdStore = mock( TransactionIdStore.class );
@Test( timeout = 500 )
public void shouldAlwaysReturnIfTheRequestVersionIsBaseTxIdOrLess() throws Exception
{
// given
when( transactionIdStore.getLastClosedTransactionId() ).thenReturn( -1L );
TransactionIdTracker transactionIdTracker =
new TransactionIdTracker( () -> transactionIdStore, BASE_TX_ID, 5, SECONDS );
// when
transactionIdTracker.assertUpToDate();
// then all good!
}
@Test( timeout = 500 )
public void shouldReturnIfTheVersionIsUpToDate() throws Exception
{
// given
long version = 5L;
when( transactionIdStore.getLastClosedTransactionId() ).thenReturn( version );
TransactionIdTracker transactionIdTracker =
new TransactionIdTracker( () -> transactionIdStore, version, 5, SECONDS );
// when
transactionIdTracker.assertUpToDate();
// then all good!
}
@Test( timeout = 300 )
public void shouldTimeoutIfTheVersionIsTooHigh() throws Exception
{
// given
long version = 5L;
when( transactionIdStore.getLastClosedTransactionId() ).thenReturn( version );
TransactionIdTracker transactionIdTracker =
new TransactionIdTracker( () -> transactionIdStore, version + 1, 100, MILLISECONDS );
// when
try
{
transactionIdTracker.assertUpToDate();
fail( "should have thrown" );
}
catch ( TransactionFailureException ex )
{
// then all good!
}
}
@Test( timeout = 2000 )
public void shouldBeKeepCheckingForNewVersionUntilTheTimeoutIsReached() throws Exception
{
// given
long version = 5L;
when( transactionIdStore.getLastClosedTransactionId() )
.thenReturn( version, version, version, version, version + 1 );
TransactionIdTracker transactionIdTracker =
new TransactionIdTracker( () -> transactionIdStore, version + 1, 5, SECONDS );
// when
transactionIdTracker.assertUpToDate();
// then all good!
}
@Test( timeout = 500 )
public void shouldBeAbleToUpdateTheVersion() throws Exception
{
// given
when( transactionIdStore.getLastClosedTransactionId() ).thenReturn( 42L );
long newVersion = 45L;
TransactionIdTracker transactionIdTracker =
new TransactionIdTracker( () -> transactionIdStore, newVersion, 10, MILLISECONDS );
try
{
transactionIdTracker.assertUpToDate();
fail( "should have thrown" );
}
catch ( TransactionFailureException e )
{
// expected
}
when( transactionIdStore.getLastClosedTransactionId() ).thenReturn( newVersion );
// when
transactionIdTracker.updateVersion( 46L );
try
{
transactionIdTracker.assertUpToDate();
fail( "should have thrown" );
}
catch ( TransactionFailureException e )
{
// then all good!
}
}
@Test( timeout = 500 )
public void shouldNotUpdateVersionIfNoPreviousTransactionsInTheDatabase() throws Exception
{
// given
when( transactionIdStore.getLastClosedTransactionId() ).thenReturn( 42L );
final int txIdForEmptyDatabase = -1;
TransactionIdTracker transactionIdTracker =
new TransactionIdTracker( () -> transactionIdStore, txIdForEmptyDatabase, 5, SECONDS );
transactionIdTracker.assertUpToDate();
// when
transactionIdTracker.updateVersion( 46L );
transactionIdTracker.assertUpToDate();
// then all good!
}
@Test( timeout = 500 )
public void shouldUpdateVersionUsingTheTransactionIdStoreWhenTheGivenVersionIsBaseTxIdOrLess() throws Exception
{
// given
when( transactionIdStore.getLastClosedTransactionId() ).thenReturn(
42L, 44L, 43L /* this doesn't make any sense in real life but it helps asserting in this scenario */ );
TransactionIdTracker transactionIdTracker =
new TransactionIdTracker( () -> transactionIdStore, 42L, 10, MILLISECONDS );
transactionIdTracker.assertUpToDate();
// when
transactionIdTracker.updateVersion( BASE_TX_ID );
try
{
transactionIdTracker.assertUpToDate();
fail( "should have thrown" );
}
catch ( TransactionFailureException e )
{
// then all good!
}
}
}