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DeadState.java
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DeadState.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.store.kvstore;
import java.io.File;
import java.io.IOException;
import java.util.Optional;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.Consumer;
import java.util.function.Function;
import org.neo4j.helpers.collection.Pair;
abstract class DeadState<Key> extends ProgressiveState<Key>
{
@Override
protected Headers headers()
{
throw new IllegalStateException( "Cannot read in state: " + stateName() );
}
@Override
protected boolean lookup( Key key, ValueSink sink ) throws IOException
{
throw new IllegalStateException( "Cannot read in state: " + stateName() );
}
@Override
protected DataProvider dataProvider() throws IOException
{
throw new IllegalStateException( "Cannot read in state: " + stateName() );
}
@Override
protected int storedEntryCount()
{
throw new IllegalStateException( "Cannot read in state: " + stateName() );
}
@Override
protected Optional<EntryUpdater<Key>> optionalUpdater( long version, Lock lock )
{
throw new IllegalStateException( "Cannot write in state: " + stateName() );
}
@Override
protected EntryUpdater<Key> unsafeUpdater( Lock lock )
{
throw new IllegalStateException( "Cannot write in state: " + stateName() );
}
@Override
protected boolean hasChanges()
{
return false;
}
@Override
public void close() throws IOException
{
throw new IllegalStateException( "Cannot close() in state: " + stateName() );
}
@Override
protected File file()
{
throw new IllegalStateException( "No file assigned in state: " + stateName() );
}
@Override
protected long version()
{
return keys.version( null );
}
@Override
protected KeyFormat<Key> keyFormat()
{
return keys;
}
private final KeyFormat<Key> keys;
final ActiveState.Factory stateFactory;
private DeadState( KeyFormat<Key> keys, ActiveState.Factory stateFactory )
{
this.keys = keys;
this.stateFactory = stateFactory;
}
static class Stopped<Key> extends DeadState<Key>
{
Stopped( KeyFormat<Key> keys, ActiveState.Factory stateFactory )
{
super( keys, stateFactory );
}
@Override
String stateName()
{
return "stopped";
}
@Override
ProgressiveState<Key> initialize( RotationStrategy rotation ) throws IOException
{
Pair<File, KeyValueStoreFile> opened = rotation.open();
if ( opened == null )
{
return new NeedsCreation<>( keyFormat(), stateFactory, rotation );
}
return new Prepared<>( stateFactory.open( ReadableState.store( keyFormat(), opened.other() ),
opened.first() ) );
}
@Override
ProgressiveState<Key> stop() throws IOException
{
return this;
}
}
private static class NeedsCreation<Key> extends DeadState<Key>
implements Function<ActiveState<Key>, NeedsCreation<Key>>
{
private final RotationStrategy rotation;
private NeedsCreation( KeyFormat<Key> keys, ActiveState.Factory stateFactory, RotationStrategy rotation )
{
super( keys, stateFactory );
this.rotation = rotation;
}
@Override
ProgressiveState<Key> stop() throws IOException
{
return new Stopped<>( keyFormat(), stateFactory );
}
@Override
String stateName()
{
return "needs creation";
}
@Override
ActiveState<Key> start( DataInitializer<EntryUpdater<Key>> initializer ) throws IOException
{
if ( initializer == null )
{
throw new IllegalStateException( "Store needs to be created, and no initializer is given." );
}
Pair<File, KeyValueStoreFile> created = initialState( initializer );
return stateFactory.open( ReadableState.store( keyFormat(), created.other() ), created.first() );
}
private Pair<File, KeyValueStoreFile> initialState( DataInitializer<EntryUpdater<Key>> initializer )
throws IOException
{
long version = initializer.initialVersion();
ActiveState<Key> creation = stateFactory.open( ReadableState.empty( keyFormat(), version ), null );
try
{
try ( EntryUpdater<Key> updater = creation.resetter( new ReentrantLock(), new Runnable()
{
@Override
public void run()
{
}
} ) )
{
initializer.initialize( updater );
}
return rotation.create( keyFormat().filter( creation.dataProvider() ), initializer.initialVersion() );
}
finally
{
creation.close();
}
}
/** called during recovery */
@Override
protected Optional<EntryUpdater<Key>> optionalUpdater( long version, Lock lock )
{
return Optional.empty();
}
/** for rotating recovered state (none) */
@Override
RotationState<Key> prepareRotation( long version )
{
return new Rotation<Key, NeedsCreation<Key>>( this )
{
@Override
ProgressiveState<Key> rotate( boolean force, RotationStrategy strategy, RotationTimerFactory timerFactory,
Consumer<Headers.Builder> headers )
throws IOException
{
return state;
}
@Override
public void close() throws IOException
{
}
@Override
long rotationVersion()
{
return state.version();
}
};
}
@Override
public NeedsCreation<Key> apply( ActiveState<Key> keyActiveState ) throws RuntimeException
{
return this;
}
}
private static class Prepared<Key> extends DeadState<Key>
{
private final ActiveState<Key> state;
private Prepared( ActiveState<Key> state )
{
super( state.keyFormat(), state.factory() );
this.state = state;
}
@Override
protected Headers headers()
{
return state.headers();
}
/** for applying recovered transactions */
@Override
protected Optional<EntryUpdater<Key>> optionalUpdater( long version, Lock lock )
{
if ( version <= state.version() )
{
return Optional.empty();
}
else
{
return Optional.of( state.updater( version, lock ) );
}
}
/** for rotating recovered state */
@Override
RotationState<Key> prepareRotation( long version )
{
return new Rotation<Key, RotationState.Rotation<Key>>( state.prepareRotation( version ) )
{
@Override
ProgressiveState<Key> rotate( boolean force, RotationStrategy strategy, RotationTimerFactory timerFactory,
Consumer<Headers.Builder> headers ) throws IOException
{
return new Prepared<>( state.rotate( force, strategy, timerFactory, headers ) );
}
@Override
public void close() throws IOException
{
state.close();
}
@Override
long rotationVersion()
{
return state.rotationVersion();
}
};
}
@Override
ProgressiveState<Key> stop() throws IOException
{
return state.stop();
}
@Override
String stateName()
{
return "prepared";
}
@Override
ActiveState<Key> start( DataInitializer<EntryUpdater<Key>> stateInitializer )
{
return state;
}
@Override
protected File file()
{
return state.file();
}
}
private abstract static class Rotation<Key, State extends ProgressiveState<Key>> extends RotationState<Key>
{
final State state;
Rotation( State state )
{
this.state = state;
}
@Override
protected File file()
{
return state.file();
}
@Override
Optional<EntryUpdater<Key>> optionalUpdater( long version, Lock lock )
{
throw new IllegalStateException( "Cannot write in state: " + stateName() );
}
@Override
protected EntryUpdater<Key> unsafeUpdater( Lock lock )
{
throw new IllegalStateException( "Cannot write in state: " + stateName() );
}
@Override
protected boolean hasChanges()
{
return state.hasChanges();
}
@Override
protected KeyFormat<Key> keyFormat()
{
return state.keyFormat();
}
@Override
protected Headers headers()
{
return state.headers();
}
@Override
protected long version()
{
return state.version();
}
@Override
protected boolean lookup( Key key, ValueSink sink ) throws IOException
{
throw new IllegalStateException( "Cannot read in state: " + stateName() );
}
@Override
protected DataProvider dataProvider() throws IOException
{
throw new IllegalStateException( "Cannot read in state: " + stateName() );
}
@Override
protected int storedEntryCount()
{
throw new IllegalStateException( "Cannot read in state: " + stateName() );
}
}
}