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SegmentedRaftLogRotationTruncationPruneTest.java
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SegmentedRaftLogRotationTruncationPruneTest.java
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package org.neo4j.coreedge.raft.log.segmented;
import java.io.File;
import org.junit.Test;
import org.neo4j.coreedge.raft.log.DummyRaftableContentSerializer;
import org.neo4j.coreedge.raft.log.RaftLog;
import org.neo4j.coreedge.raft.log.RaftLogEntry;
import org.neo4j.graphdb.mockfs.EphemeralFileSystemAbstraction;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.logging.NullLogProvider;
import org.neo4j.time.FakeClock;
import static org.junit.Assert.assertEquals;
import static org.neo4j.coreedge.raft.ReplicatedInteger.valueOf;
import static org.neo4j.coreedge.raft.log.segmented.SegmentedRaftLog.SEGMENTED_LOG_DIRECTORY_NAME;
public class SegmentedRaftLogRotationTruncationPruneTest
{
@Test
public void shouldPruneAwaySingleEntriesIfRotationHappenedEveryEntry() throws Exception
{
// given
RaftLog log = createRaftLog();
long term = 0;
for ( int i = 0; i < 10; i++ )
{
log.append( new RaftLogEntry( term, valueOf( i ) ) );
}
assertEquals( -1, log.prevIndex() );
for ( int i = 0; i < 9; i++ )
{
log.prune( i );
assertEquals( i, log.prevIndex() );
}
log.prune( 9 );
assertEquals( 8, log.prevIndex() );
}
@Test
public void shouldPruneAwaySingleEntriesAfterTruncationIfRotationHappenedEveryEntry() throws Exception
{
// given
RaftLog log = createRaftLog();
long term = 0;
for ( int i = 0; i < 10; i++ )
{
log.append( new RaftLogEntry( term, valueOf( i ) ) );
}
log.truncate( 9 );
log.truncate( 8 );
log.truncate( 7 );
assertEquals( -1, log.prevIndex() );
for ( int i = 0; i <= 5; i++ )
{
log.prune( i );
assertEquals( i, log.prevIndex() );
}
for ( int i = 5; i < 10; i++ )
{
log.prune( i );
assertEquals( 5, log.prevIndex() );
}
}
private RaftLog createRaftLog() throws Exception
{
FileSystemAbstraction fileSystem = new EphemeralFileSystemAbstraction();
File directory = new File( SEGMENTED_LOG_DIRECTORY_NAME );
fileSystem.mkdir( directory );
SegmentedRaftLog newRaftLog = new SegmentedRaftLog( fileSystem, directory, 1,
new DummyRaftableContentSerializer(),
NullLogProvider.getInstance(), "1 entries", 8, new FakeClock() );
newRaftLog.start();
return newRaftLog;
}
}