/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program 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; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Oct 22, 2010
*/
package com.bigdata.bop.engine;
import com.bigdata.bop.IBindingSet;
import com.bigdata.bop.solutions.SolutionSetStream;
/**
* Implementation supports a standalone database. Depending on the specific
* instance used, either the generated chunk is left on the Java heap or it is
* migrated onto the native heap using a {@link SolutionSetStream}. Either way,
* it is then handed off synchronously using
* {@link QueryEngine#acceptChunk(IChunkMessage)}. That method will queue the
* chunk for asynchronous processing.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
*/
public class StandaloneChunkHandler implements IChunkHandler {
/**
* Instance puts all chunks onto the native heap.
*
* @see BLZG-533 Vector query engine on native heap.
*/
public static final IChunkHandler NATIVE_HEAP_INSTANCE = new NativeHeapStandloneChunkHandler();
/**
* Instance puts all chunks onto the managed object heap.
*/
public static final IChunkHandler MANAGED_HEAP_INSTANCE = new ManagedHeapStandloneChunkHandler();
/**
* This instance is explicitly used for several unit tests in the query
* engine package that are not written to the RDF data model (the native
* heap version assumes an RDF data model).
*/
public static final IChunkHandler TEST_INSTANCE = new ManagedHeapStandloneChunkHandler();
private final boolean nativeHeap;
protected StandaloneChunkHandler(final boolean nativeHeap) {
this.nativeHeap = nativeHeap;
}
@Override
public int handleChunk(final IRunningQuery query, final int bopId,
final int sinkId, final IBindingSet[] chunk) {
if (query == null)
throw new IllegalArgumentException();
if (chunk == null)
throw new IllegalArgumentException();
if (chunk.length == 0)
return 0;
final IChunkMessage<IBindingSet> msg;
if (nativeHeap) {
// See BLZG-533: Vector the query engine on the native heap.
msg = new LocalNativeChunkMessage(//
query.getQueryController(),//
query.getQueryId(),//
sinkId, // bopId
-1, // partitionId
query, // runningQuery,
chunk
);
} else {
// Store the chunk on the managed object heap.
msg = new LocalChunkMessage(//
query.getQueryController(), //
query.getQueryId(),//
sinkId,// bopId
-1, // partitionId
chunk);
}
final QueryEngine queryEngine = query.getQueryEngine();
queryEngine.acceptChunk(msg);
return 1;
}
}