/**
* Copyright (c) 2013, Institute of Information Systems (Sven Groppe and contributors of LUPOSDATE), University of Luebeck
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
* following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this list of conditions and the following
* disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
* following disclaimer in the documentation and/or other materials provided with the distribution.
* - Neither the name of the University of Luebeck nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package lupos.engine.operators.singleinput.parallel;
import java.util.Iterator;
import lupos.datastructures.bindings.Bindings;
import lupos.datastructures.parallel.BoundedBuffer;
import lupos.datastructures.queryresult.QueryResult;
import lupos.engine.operators.Operator;
import lupos.engine.operators.OperatorIDTuple;
import lupos.engine.operators.messages.EndOfEvaluationMessage;
import lupos.engine.operators.messages.Message;
public class QueryResultInBlocks extends Operator {
protected final static int MAXBUFFER = 100;
protected static int BLOCKSIZE;
protected Runner runner = null;
protected BoundedBuffer<QueryResult> queryresultbuffer = new BoundedBuffer<QueryResult>(MAXBUFFER);
public QueryResultInBlocks() {
BLOCKSIZE = ParallelOperand.getQueueLimit();
}
@Override
public QueryResult process(final QueryResult queryResult,
final int operandID) {
try {
this.queryresultbuffer.put(queryResult);
} catch (final InterruptedException e) {
System.err.println(e);
e.printStackTrace();
}
if (this.runner == null) {
this.runner = new Runner();
this.runner.start();
}
return null;
}
@Override
public Message preProcessMessage(final EndOfEvaluationMessage msg) {
this.queryresultbuffer.endOfData();
// wait until thread finished!
if (this.runner != null)
try {
this.runner.join();
} catch (final InterruptedException e) {
System.err.println();
e.printStackTrace();
}
return msg;
}
public class Runner extends Thread {
@Override
public void run() {
try {
while (QueryResultInBlocks.this.queryresultbuffer.hasNext()) {
final QueryResult queryResult = QueryResultInBlocks.this.queryresultbuffer.get();
final Iterator<Bindings> ib = queryResult.oneTimeIterator();
while (ib.hasNext()) {
final QueryResult queryresult_new = QueryResult
.createInstance();
for (int i = 0; i < BLOCKSIZE && ib.hasNext(); i++) {
queryresult_new.add(ib.next());
}
for (final OperatorIDTuple opId : QueryResultInBlocks.this.succeedingOperators) {
opId.processAll(queryresult_new);
}
}
}
} catch (final InterruptedException e) {
System.err.println(e);
e.printStackTrace();
}
}
}
}