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StoreStatement.java
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StoreStatement.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.api.store;
import java.util.function.Supplier;
import org.neo4j.collection.pool.Pool;
import org.neo4j.collection.primitive.PrimitiveLongCollections;
import org.neo4j.collection.primitive.PrimitiveLongIterator;
import org.neo4j.cursor.Cursor;
import org.neo4j.kernel.api.exceptions.index.IndexNotFoundKernelException;
import org.neo4j.kernel.api.index.IndexDescriptor;
import org.neo4j.kernel.impl.api.IndexReaderFactory;
import org.neo4j.kernel.impl.locking.LockService;
import org.neo4j.kernel.impl.store.CommonAbstractStore;
import org.neo4j.kernel.impl.store.NeoStores;
import org.neo4j.kernel.impl.store.NodeStore;
import org.neo4j.kernel.impl.store.RelationshipStore;
import org.neo4j.kernel.impl.store.record.NodeRecord;
import org.neo4j.kernel.impl.store.record.RelationshipRecord;
import org.neo4j.kernel.impl.util.InstanceCache;
import org.neo4j.storageengine.api.NodeItem;
import org.neo4j.storageengine.api.RelationshipItem;
import org.neo4j.storageengine.api.StorageStatement;
import org.neo4j.storageengine.api.schema.IndexReader;
import org.neo4j.storageengine.api.schema.LabelScanReader;
/**
* Statement for store layer. This allows for acquisition of cursors on the store data.
* <p/>
* The cursors call the release methods, so there is no need for manual release, only
* closing those cursor.
* <p/>
* {@link NeoStores} caches one of these per thread, so that they can be reused between statements/transactions.
*/
public class StoreStatement implements StorageStatement
{
private final InstanceCache<StoreSingleNodeCursor> singleNodeCursor;
private final InstanceCache<StoreIteratorNodeCursor> iteratorNodeCursor;
private final InstanceCache<StoreSingleRelationshipCursor> singleRelationshipCursor;
private final InstanceCache<StoreIteratorRelationshipCursor> iteratorRelationshipCursor;
private final NeoStores neoStores;
private final NodeStore nodeStore;
private final RelationshipStore relationshipStore;
private final Supplier<IndexReaderFactory> indexReaderFactorySupplier;
private IndexReaderFactory indexReaderFactory;
private final Supplier<LabelScanReader> labelScanStore;
private LabelScanReader labelScanReader;
private boolean closed;
private final Pool<StoreStatement> pool;
public StoreStatement( final NeoStores neoStores, final LockService lockService,
Supplier<IndexReaderFactory> indexReaderFactory,
Supplier<LabelScanReader> labelScanReaderSupplier, Pool<StoreStatement> pool )
{
this.neoStores = neoStores;
this.indexReaderFactorySupplier = indexReaderFactory;
this.labelScanStore = labelScanReaderSupplier;
this.pool = pool;
this.nodeStore = neoStores.getNodeStore();
this.relationshipStore = neoStores.getRelationshipStore();
singleNodeCursor = new InstanceCache<StoreSingleNodeCursor>()
{
@Override
protected StoreSingleNodeCursor create()
{
return new StoreSingleNodeCursor( new NodeRecord( -1 ), neoStores, StoreStatement.this, this,
lockService );
}
};
iteratorNodeCursor = new InstanceCache<StoreIteratorNodeCursor>()
{
@Override
protected StoreIteratorNodeCursor create()
{
return new StoreIteratorNodeCursor( new NodeRecord( -1 ), neoStores, StoreStatement.this, this,
lockService );
}
};
singleRelationshipCursor = new InstanceCache<StoreSingleRelationshipCursor>()
{
@Override
protected StoreSingleRelationshipCursor create()
{
return new StoreSingleRelationshipCursor( new RelationshipRecord( -1 ),
neoStores, StoreStatement.this, this, lockService );
}
};
iteratorRelationshipCursor = new InstanceCache<StoreIteratorRelationshipCursor>()
{
@Override
protected StoreIteratorRelationshipCursor create()
{
return new StoreIteratorRelationshipCursor( new RelationshipRecord( -1 ),
neoStores, StoreStatement.this, this, lockService );
}
};
}
public StoreStatement initialize()
{
this.closed = false;
return this;
}
@Override
public Cursor<NodeItem> acquireSingleNodeCursor( long nodeId )
{
neoStores.assertOpen();
return singleNodeCursor.get().init( nodeId );
}
@Override
public Cursor<NodeItem> acquireIteratorNodeCursor( PrimitiveLongIterator nodeIdIterator )
{
neoStores.assertOpen();
return iteratorNodeCursor.get().init( nodeIdIterator );
}
@Override
public Cursor<RelationshipItem> acquireSingleRelationshipCursor( long relId )
{
neoStores.assertOpen();
return singleRelationshipCursor.get().init( relId );
}
@Override
public Cursor<RelationshipItem> acquireIteratorRelationshipCursor( PrimitiveLongIterator iterator )
{
neoStores.assertOpen();
return iteratorRelationshipCursor.get().init( iterator );
}
@Override
public Cursor<NodeItem> nodesGetAllCursor()
{
return acquireIteratorNodeCursor( new AllStoreIdIterator( nodeStore ) );
}
@Override
public Cursor<RelationshipItem> relationshipsGetAllCursor()
{
return acquireIteratorRelationshipCursor( new AllStoreIdIterator( relationshipStore ) );
}
@Override
public void close()
{
assert !closed;
if ( indexReaderFactory != null )
{
indexReaderFactory.close();
}
if ( labelScanReader != null )
{
labelScanReader.close();
labelScanReader = null;
}
closed = true;
pool.release( this );
}
private class AllStoreIdIterator extends PrimitiveLongCollections.PrimitiveLongBaseIterator
{
private final CommonAbstractStore store;
private long highId;
private long currentId;
public AllStoreIdIterator( CommonAbstractStore store )
{
this.store = store;
highId = store.getHighestPossibleIdInUse();
}
@Override
protected boolean fetchNext()
{
while ( true )
{ // This outer loop is for checking if highId has changed since we started.
if ( currentId <= highId )
{
try
{
return next( currentId );
}
finally
{
currentId++;
}
}
long newHighId = store.getHighestPossibleIdInUse();
if ( newHighId > highId )
{
highId = newHighId;
}
else
{
break;
}
}
return false;
}
}
@Override
public LabelScanReader getLabelScanReader()
{
return labelScanReader != null ?
labelScanReader : (labelScanReader = labelScanStore.get());
}
private IndexReaderFactory indexReaderFactory()
{
return indexReaderFactory != null ?
indexReaderFactory : (indexReaderFactory = indexReaderFactorySupplier.get());
}
@Override
public IndexReader getIndexReader( IndexDescriptor descriptor ) throws IndexNotFoundKernelException
{
return indexReaderFactory().newReader( descriptor );
}
@Override
public IndexReader getFreshIndexReader( IndexDescriptor descriptor ) throws IndexNotFoundKernelException
{
return indexReaderFactory().newUnCachedReader( descriptor );
}
}