/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
**********************************************************************************************************************/
package eu.stratosphere.pact.runtime.io;
import java.io.EOFException;
import java.io.IOException;
import java.util.List;
import eu.stratosphere.core.memory.MemorySegment;
import eu.stratosphere.core.memory.MemorySegmentSource;
import eu.stratosphere.nephele.services.memorymanager.AbstractPagedOutputView;
import eu.stratosphere.pact.runtime.util.MathUtils;
/**
*
* The list with the full segments contains at any point all completely full segments, plus the segment that is
* currently filled.
*
*/
public class SimpleCollectingOutputView extends AbstractPagedOutputView
{
private final List<MemorySegment> fullSegments;
private final MemorySegmentSource memorySource;
private final int segmentSizeBits;
private int segmentNum;
public SimpleCollectingOutputView(List<MemorySegment> fullSegmentTarget,
MemorySegmentSource memSource, int segmentSize)
{
super(memSource.nextSegment(), segmentSize, 0);
this.segmentSizeBits = MathUtils.log2strict(segmentSize);
this.fullSegments = fullSegmentTarget;
this.memorySource = memSource;
this.fullSegments.add(getCurrentSegment());
}
public void reset()
{
if (this.fullSegments.size() != 0) {
throw new IllegalStateException("The target list still contains memory segments.");
}
clear();
try {
advance();
} catch (IOException ioex) {
throw new RuntimeException("Error getting first segment for record collector.", ioex);
}
this.segmentNum = 0;
}
/* (non-Javadoc)
* @see eu.stratosphere.nephele.services.memorymanager.AbstractPagedOutputView#nextSegment(eu.stratosphere.nephele.services.memorymanager.MemorySegment, int)
*/
@Override
protected MemorySegment nextSegment(MemorySegment current, int positionInCurrent) throws EOFException
{
final MemorySegment next = this.memorySource.nextSegment();
if (next != null) {
this.fullSegments.add(next);
this.segmentNum++;
return next;
} else {
throw new EOFException();
}
}
public long getCurrentOffset() {
return (((long) this.segmentNum) << this.segmentSizeBits) + getCurrentPositionInSegment();
}
}