/***********************************************************************************************************************
*
* 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.nephele.util;
import eu.stratosphere.core.memory.MemorySegment;
import eu.stratosphere.runtime.io.Buffer;
import eu.stratosphere.runtime.io.BufferRecycler;
import eu.stratosphere.runtime.io.network.bufferprovider.BufferAvailabilityListener;
import eu.stratosphere.runtime.io.network.bufferprovider.BufferProvider;
import java.io.IOException;
import java.util.Random;
public class TestBufferProvider implements BufferProvider {
private final BufferRecycler recycler = new DiscardingRecycler();
private final Random rnd = new Random();
private final int sizeOfMemorySegments;
private final float probabilityForNoneAvailable;
public TestBufferProvider(int sizeOfMemorySegments) {
this(sizeOfMemorySegments, -1.0f);
}
public TestBufferProvider(int sizeOfMemorySegments, float probabilityForNoneAvailable) {
this.sizeOfMemorySegments = sizeOfMemorySegments;
this.probabilityForNoneAvailable = probabilityForNoneAvailable;
}
@Override
public Buffer requestBuffer(int sizeOfBuffer) throws IOException {
if (rnd.nextFloat() < this.probabilityForNoneAvailable) {
return null;
} else {
MemorySegment segment = new MemorySegment(new byte[this.sizeOfMemorySegments]);
return new Buffer(segment, sizeOfBuffer, this.recycler);
}
}
@Override
public Buffer requestBufferBlocking(int sizeOfBuffer) throws IOException, InterruptedException {
MemorySegment segment = new MemorySegment(new byte[this.sizeOfMemorySegments]);
return new Buffer(segment, sizeOfBuffer, this.recycler);
}
@Override
public int getBufferSize() {
return Integer.MAX_VALUE;
}
@Override
public void reportAsynchronousEvent() {
throw new UnsupportedOperationException();
}
@Override
public BufferAvailabilityRegistration registerBufferAvailabilityListener(BufferAvailabilityListener bufferAvailabilityListener) {
throw new UnsupportedOperationException();
}
}