com.ibm.mqlight.api.impl.callback.ThreadPoolCallbackService Maven / Gradle / Ivy
/**
* 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 com.ibm.mqlight.api.impl.callback;
import java.util.LinkedList;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import com.ibm.mqlight.api.Promise;
import com.ibm.mqlight.api.callback.CallbackService;
import com.ibm.mqlight.api.logging.Logger;
import com.ibm.mqlight.api.logging.LoggerFactory;
public class ThreadPoolCallbackService implements CallbackService {
private static final Logger logger = LoggerFactory.getLogger(ThreadPoolCallbackService.class);
private static class WorkList implements Runnable {
private static final Logger logger = LoggerFactory.getLogger(WorkList.class);
private final ThreadPoolExecutor executor;
private boolean running = false;
private final LinkedList runnables = new LinkedList<>();
private final LinkedList> promises = new LinkedList<>();
private WorkList(ThreadPoolExecutor executor) {
final String methodName = "";
logger.entry(this, methodName, executor);
this.executor = executor;
logger.exit(this, methodName);
}
@Override
public void run() {
final String methodName = "run";
logger.entry(this, methodName);
while(true) {
Runnable runnable;
Promise promise;
synchronized(this) {
if (runnables.isEmpty()) {
running = false;
break;
} else {
runnable = runnables.removeFirst();
promise = promises.removeFirst();
}
}
try {
runnable.run();
promise.setSuccess(null);
} catch(Exception e) {
promise.setFailure(e);
}
}
logger.exit(this, methodName);
}
public synchronized void put(Runnable runnable, Promise promise) {
final String methodName = "put";
logger.entry(this, methodName, runnable, promise);
runnables.addLast(runnable);
promises.addLast(promise);
if (!running) {
running = true;
executor.submit(this);
}
logger.exit(this, methodName);
}
}
private final int poolSize;
private final ThreadPoolExecutor executor;
private final WorkList workLists[];
public ThreadPoolCallbackService(int poolSize) {
final String methodName = "";
logger.entry(this, methodName, poolSize);
this.poolSize = poolSize;
executor = new ThreadPoolExecutor(0, poolSize, 500, TimeUnit.MILLISECONDS, new LinkedBlockingQueue());
workLists = new WorkList[poolSize];
for (int i = 0; i < poolSize; ++i) workLists[i] = new WorkList(executor);
logger.exit(this, methodName);
}
@Override
public void run(Runnable runnable, Object orderingCtx, Promise promise) {
final String methodName = "run";
logger.entry(this, methodName, runnable, orderingCtx, promise);
int hash = orderingCtx.hashCode();
if (hash == Integer.MIN_VALUE) hash = Integer.MIN_VALUE + 1; // Avoid possibility that Math.abs(Integer.MIN_VALUE) == Integer.MIN_VALUE
workLists[Math.abs(hash) % poolSize].put(runnable, promise);
logger.exit(this, methodName);
}
}