/*
* 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.isis.core.runtime.threadpool;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import com.google.common.collect.Lists;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public final class ThreadPoolSupport {
private static final Logger LOG = LoggerFactory.getLogger(ThreadPoolSupport.class);
public static ThreadGroup group;
public static ThreadPoolExecutor executor ;
static {
group = new ThreadGroup(ThreadPoolSupport.class.getName());
final int corePoolSize = Runtime.getRuntime().availableProcessors();
final int maximumPoolSize = Runtime.getRuntime().availableProcessors();
final int keepAliveTimeSecs = 5;
final int queueCapacity = 25;
final BlockingQueue<Runnable> workQueue = new LinkedBlockingQueue<>(queueCapacity);
executor = new ThreadPoolExecutor(
corePoolSize,
maximumPoolSize,
keepAliveTimeSecs, TimeUnit.SECONDS,
workQueue,
new ThreadFactory() {
@Override
public Thread newThread(final Runnable r) {
return new Thread(group, r);
}
});
}
public static List<Object> join(final List<Future<Object>> futures) {
if (futures == null) {
return null;
}
final long t0 = System.currentTimeMillis();
try{
final List<Object> returnValues = Lists.newArrayList();
for (Future<Object> future : futures) {
returnValues.add(join(future));
}
return returnValues;
} finally {
final long t1 = System.currentTimeMillis();
LOG.info("join'ing {} tasks: waited {} milliseconds ", futures.size(), (t1-t0));
}
}
public static Object join(final Future<Object> future) {
try {
return future.get();
} catch (InterruptedException | ExecutionException e) {
// ignore
}
return null;
}
public static List<Future<Object>> invokeAll(final List<Callable<Object>> callables) {
try {
return executor.invokeAll(callables);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
}
}