/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.tinkerpop.gremlin.process.computer.util;
import org.apache.tinkerpop.gremlin.process.computer.MapReduce;
import org.apache.tinkerpop.gremlin.process.computer.Memory;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
/**
* @author Marko A. Rodriguez (http://markorodriguez.com)
*/
public final class MapReducePool {
private final LinkedBlockingQueue<MapReduce<?, ?, ?, ?, ?>> pool;
private static final int TIMEOUT_MS = 2500;
public MapReducePool(final MapReduce mapReduce, final int poolSize) {
this.pool = new LinkedBlockingQueue<>(poolSize);
while (this.pool.remainingCapacity() > 0) {
this.pool.add(mapReduce.clone());
}
}
public MapReduce take() {
try {
return this.pool.poll(TIMEOUT_MS, TimeUnit.MILLISECONDS);
} catch (final InterruptedException e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
public void offer(final MapReduce<?, ?, ?, ?, ?> mapReduce) {
try {
this.pool.offer(mapReduce, TIMEOUT_MS, TimeUnit.MILLISECONDS);
} catch (final InterruptedException e) {
throw new IllegalStateException(e.getMessage(), e);
}
}
}