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StatePersisterTest.java
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StatePersisterTest.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 Affero 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.coreedge.raft.state;
import java.io.File;
import java.nio.ByteBuffer;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Supplier;
import org.junit.Rule;
import org.junit.Test;
import org.neo4j.coreedge.raft.state.membership.Marshal;
import org.neo4j.graphdb.mockfs.EphemeralFileSystemAbstraction;
import org.neo4j.test.TargetDirectory;
import static org.junit.Assert.assertEquals;
import static org.mockito.Mockito.mock;
import static org.neo4j.coreedge.raft.state.id_allocation.OnDiskIdAllocationState.FILENAME;
public class StatePersisterTest
{
@Rule
public TargetDirectory.TestDirectory testDir = TargetDirectory.testDirForTest( getClass() );
@Test
public void shouldMaintainStateGivenAnEmptyInitialStore() throws Exception
{
// given
EphemeralFileSystemAbstraction fsa = new EphemeralFileSystemAbstraction();
fsa.mkdir( testDir.directory() );
StatePersister<AtomicInteger> statePersister = new StatePersister<>( stateFileA(), stateFileB(), fsa, 100,
ByteBuffer.allocate( 10_000 ), new AtomicIntegerMarshal(), stateFileA(),
mock( Supplier.class ) );
// when
statePersister.persistStoreData( new AtomicInteger( 99 ) );
// then
assertEquals( 4, fsa.getFileSize( stateFileA() ) );
}
@Test
public void shouldRotateToOtherStoreFileAfterSufficientEntries() throws Exception
{
// given
EphemeralFileSystemAbstraction fsa = new EphemeralFileSystemAbstraction();
fsa.mkdir( testDir.directory() );
final int numberOfEntriesBeforeRotation = 100;
StatePersister<AtomicInteger> statePersister = new StatePersister<>( stateFileA(), stateFileB(), fsa,
numberOfEntriesBeforeRotation,
ByteBuffer.allocate( 10_000 ), new AtomicIntegerMarshal(), stateFileA(),
mock( Supplier.class ) );
// when
for ( int i = 0; i < numberOfEntriesBeforeRotation; i++ )
{
statePersister.persistStoreData( new AtomicInteger( i ) );
}
// Force the rotation
statePersister.persistStoreData( new AtomicInteger( 9999 ) );
// then
assertEquals( 4, fsa.getFileSize( stateFileB() ) );
assertEquals( numberOfEntriesBeforeRotation * 4, fsa.getFileSize( stateFileA() ) );
}
@Test
public void shouldRotateBackToFirstStoreFileAfterSufficientEntries() throws Exception
{
// given
EphemeralFileSystemAbstraction fsa = new EphemeralFileSystemAbstraction();
fsa.mkdir( testDir.directory() );
final int numberOfEntriesBeforeRotation = 100;
StatePersister<AtomicInteger> statePersister = new StatePersister<>( stateFileA(), stateFileB(), fsa,
numberOfEntriesBeforeRotation,
ByteBuffer.allocate( 10_000 ), new AtomicIntegerMarshal(), stateFileA(),
mock( Supplier.class ) );
// when
for ( int i = 0; i < numberOfEntriesBeforeRotation * 2; i++ )
{
statePersister.persistStoreData( new AtomicInteger( i ) );
}
// Force the rotation back to the first store
statePersister.persistStoreData( new AtomicInteger( 9999 ) );
// then
assertEquals( 4, fsa.getFileSize( stateFileA() ) );
assertEquals( numberOfEntriesBeforeRotation * 4, fsa.getFileSize( stateFileB() ) );
}
private static class AtomicIntegerMarshal implements Marshal<AtomicInteger>
{
@Override
public void marshal( AtomicInteger atomicInteger, ByteBuffer buffer )
{
buffer.putInt( atomicInteger.intValue() );
}
@Override
public AtomicInteger unmarshal( ByteBuffer source )
{
return new AtomicInteger( source.getInt() );
}
}
private File stateFileA()
{
return new File( testDir.directory(), FILENAME + "a" );
}
private File stateFileB()
{
return new File( testDir.directory(), FILENAME + "b" );
}
}