/***********************************************************************************************************************
* 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.sort;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import eu.stratosphere.types.Record;
import eu.stratosphere.util.MutableObjectIterator;
/**
*/
public class MockRecordReader implements MutableObjectIterator<Record> {
private final Record SENTINEL = new Record();
private final BlockingQueue<Record> queue;
public MockRecordReader() {
this.queue = new ArrayBlockingQueue<Record>(32, false);
}
public MockRecordReader(int size) {
this.queue = new ArrayBlockingQueue<Record>(size, false);
}
@Override
public Record next(Record reuse) {
Record r = null;
while (r == null) {
try {
r = queue.take();
} catch (InterruptedException iex) {
throw new RuntimeException("Reader was interrupted.");
}
}
if (r == SENTINEL) {
// put the sentinel back, to ensure that repeated calls do not block
try {
queue.put(r);
} catch (InterruptedException e) {
throw new RuntimeException("Reader was interrupted.");
}
return null;
} else {
r.copyTo(reuse);
return reuse;
}
}
public void emit(Record element) throws InterruptedException {
queue.put(element.createCopy());
}
public void close() {
try {
queue.put(SENTINEL);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}