/**
* Copyright (c) 2002-2011 "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.kernel.impl.core;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
import javax.transaction.Transaction;
import javax.transaction.TransactionManager;
import org.neo4j.graphdb.NotFoundException;
import org.neo4j.graphdb.NotInTransactionException;
import org.neo4j.graphdb.TransactionFailureException;
import org.neo4j.kernel.impl.nioneo.store.PropertyIndexData;
import org.neo4j.kernel.impl.persistence.EntityIdGenerator;
import org.neo4j.kernel.impl.persistence.PersistenceManager;
import org.neo4j.kernel.impl.util.ArrayMap;
public class PropertyIndexManager
{
private ArrayMap<String,List<PropertyIndex>> indexMap =
new ArrayMap<String,List<PropertyIndex>>( 5, true, false );
private ArrayMap<Integer,PropertyIndex> idToIndexMap =
new ArrayMap<Integer,PropertyIndex>( 9, true, false );
private ArrayMap<Transaction,TxCommitHook> txCommitHooks =
new ArrayMap<Transaction,TxCommitHook>( 5, true, false );
private final TransactionManager transactionManager;
private final PersistenceManager persistenceManager;
private final EntityIdGenerator idGenerator;
private boolean hasAll = false;
PropertyIndexManager( TransactionManager transactionManager,
PersistenceManager persistenceManager, EntityIdGenerator idGenerator )
{
this.transactionManager = transactionManager;
this.persistenceManager = persistenceManager;
this.idGenerator = idGenerator;
}
void clear()
{
indexMap = new ArrayMap<String,List<PropertyIndex>>( 5, true, false );
idToIndexMap = new ArrayMap<Integer,PropertyIndex>( 9, true, false );
txCommitHooks.clear();
}
public Iterable<PropertyIndex> index( String key )
{
List<PropertyIndex> list = indexMap.get( key );
TxCommitHook hook = txCommitHooks.get( getTransaction() );
if ( hook != null )
{
PropertyIndex index = hook.getIndex( key );
if ( index != null )
{
List<PropertyIndex> added = new ArrayList<PropertyIndex>();
if ( list != null )
{
added.addAll( list );
}
added.add( index );
return added;
}
}
if ( list == null )
{
list = Collections.emptyList();
}
return list;
}
void setHasAll( boolean status )
{
hasAll = status;
}
boolean hasAll()
{
return hasAll;
}
public boolean hasIndexFor( int keyId )
{
return idToIndexMap.get( keyId ) != null;
}
void addPropertyIndexes( PropertyIndexData[] indexes )
{
for ( PropertyIndexData rawIndex : indexes )
{
addPropertyIndex( new PropertyIndex( rawIndex.getValue(),
rawIndex.getKeyId() ) );
}
}
void addPropertyIndex( PropertyIndexData rawIndex )
{
addPropertyIndex( new PropertyIndex( rawIndex.getValue(),
rawIndex.getKeyId() ) );
}
public PropertyIndex getIndexFor( int keyId )
{
PropertyIndex index = idToIndexMap.get( keyId );
if ( index == null )
{
TxCommitHook commitHook = txCommitHooks.get( getTransaction() );
if ( commitHook != null )
{
index = commitHook.getIndex( keyId );
if ( index != null )
{
return index;
}
}
String indexString;
indexString = persistenceManager.loadIndex( keyId );
if ( indexString == null )
{
throw new NotFoundException( "Index not found [" + keyId + "]" );
}
index = new PropertyIndex( indexString, keyId );
addPropertyIndex( index );
}
return index;
}
// need synch here so we don't create multiple lists
private synchronized void addPropertyIndex( PropertyIndex index )
{
List<PropertyIndex> list = indexMap.get( index.getKey() );
if ( list == null )
{
list = new CopyOnWriteArrayList<PropertyIndex>();
indexMap.put( index.getKey(), list );
}
list.add( index );
idToIndexMap.put( index.getKeyId(), index );
}
private Transaction getTransaction()
{
try
{
return transactionManager.getTransaction();
}
catch ( Exception e )
{
throw new TransactionFailureException(
"Unable to get transaction.", e );
}
}
// concurent transactions may create duplicate keys, oh well
PropertyIndex createPropertyIndex( String key )
{
Transaction tx = getTransaction();
if ( tx == null )
{
throw new NotInTransactionException(
"Unable to create property index for " + key );
}
TxCommitHook hook = txCommitHooks.get( tx );
if ( hook == null )
{
hook = new TxCommitHook();
txCommitHooks.put( tx, hook );
}
PropertyIndex index = hook.getIndex( key );
if ( index != null )
{
return index;
}
int id = (int) idGenerator.nextId( PropertyIndex.class );
index = new PropertyIndex( key, id );
hook.addIndex( index );
persistenceManager.createPropertyIndex( key, id );
return index;
}
void setRollbackOnly()
{
try
{
transactionManager.setRollbackOnly();
}
catch ( javax.transaction.SystemException se )
{
se.printStackTrace();
}
}
void commit( Transaction tx )
{
if ( tx != null )
{
TxCommitHook hook = txCommitHooks.remove( tx );
if ( hook != null )
{
for ( PropertyIndex index : hook.getAddedPropertyIndexes() )
{
addPropertyIndex( index );
}
}
}
}
void rollback( Transaction tx )
{
txCommitHooks.remove( tx );
}
private static class TxCommitHook
{
private Map<String,PropertyIndex> createdIndexes =
new HashMap<String,PropertyIndex>();
private Map<Integer,PropertyIndex> idToIndex =
new HashMap<Integer,PropertyIndex>();
TxCommitHook()
{
}
void addIndex( PropertyIndex index )
{
assert !createdIndexes.containsKey( index.getKey() );
createdIndexes.put( index.getKey(), index );
idToIndex.put( index.getKeyId(), index );
}
PropertyIndex getIndex( String key )
{
return createdIndexes.get( key );
}
PropertyIndex getIndex( int keyId )
{
return idToIndex.get( keyId );
}
Iterable<PropertyIndex> getAddedPropertyIndexes()
{
return createdIndexes.values();
}
}
}