Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* 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 studio.raptor.ddal.common.util;
import com.google.common.base.Preconditions;
import java.util.Map;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
public class ExecutorUtil {
public static Map executors = new ConcurrentHashMap();
public static final ExecutorService createSingleThreadPool(String name) {
Preconditions.checkArgument(!executors.containsKey(name), "%s executor exists", name);
ExecutorService executorService = Executors.newSingleThreadExecutor(new NameableThreadFactory(name, true));
executors.put(name, executorService);
return executorService;
}
public static final ExecutorService createFixedThreadPool(String name, int size) {
return createFixedThreadPool(name, size, true);
}
public static final ExecutorService createFixedThreadPool(String name, int size, boolean isDaemon) {
Preconditions.checkArgument(!executors.containsKey(name), "%s executor exists", name);
ExecutorService executorService = Executors.newFixedThreadPool(size, new NameableThreadFactory(name, isDaemon));
executors.put(name, executorService);
return executorService;
}
public static final ExecutorService createCachedThreadPool(String name) {
return createCachedThreadPool(name, true);
}
public static final ExecutorService createCachedThreadPool(String name, boolean isDaemon) {
Preconditions.checkArgument(!executors.containsKey(name), "%s executor exists", name);
ExecutorService executorService = Executors.newCachedThreadPool(new NameableThreadFactory(name, isDaemon));
executors.put(name, executorService);
return executorService;
}
public static final ExecutorService createCachedThreadPool(String name, int coreSize, int maxSize) {
Preconditions.checkArgument(!executors.containsKey(name), "%s executor exists", name);
ExecutorService executorService = new ThreadPoolExecutor(coreSize,
maxSize,
30L,
TimeUnit.SECONDS,
new SynchronousQueue(),// 线程数可伸缩
new NameableThreadFactory(name, true),
new ThreadPoolExecutor.CallerRunsPolicy());
executors.put(name, executorService);
return executorService;
}
public static final ExecutorService createCustomizationThreadPool(String name, int coreSize, int maxSize, int queueSize) {
Preconditions.checkArgument(!executors.containsKey(name), "%s executor exists", name);
ExecutorService executorService = new ThreadPoolExecutor(coreSize,
maxSize,
30L,
TimeUnit.SECONDS,
new ArrayBlockingQueue(queueSize),// 线程数可伸缩
new NameableThreadFactory(name, true),
new ThreadPoolExecutor.AbortPolicy());
executors.put(name, executorService);
return executorService;
}
private static class NameableThreadFactory implements ThreadFactory {
private final ThreadGroup group;
private final String namePrefix;
private final AtomicInteger threadId;
private final boolean isDaemon;
public NameableThreadFactory(String name, boolean isDaemon) {
SecurityManager s = System.getSecurityManager();
this.group = (s != null) ? s.getThreadGroup() : Thread.currentThread().getThreadGroup();
this.namePrefix = name;
this.threadId = new AtomicInteger(0);
this.isDaemon = isDaemon;
}
public Thread newThread(Runnable r) {
Thread t = new Thread(group, r, namePrefix + threadId.getAndIncrement());
t.setDaemon(isDaemon);
if (t.getPriority() != Thread.NORM_PRIORITY) {
t.setPriority(Thread.NORM_PRIORITY);
}
return t;
}
}
}
