Java新建一个子线程异步运行方法 - ToB企服应用市场:ToB评测及商务社交产业平台

public class ThreadPoolUtils {
private static final Logger LOGGER = LoggerFactory.getLogger(ThreadPoolUtils.class);
private static final String POOL_NAME = "thread-im-runner";
// 等待队列长度
private static final int BLOCKING_QUEUE_LENGTH = 20000;
// 闲置线程存活时间
private static final int KEEP_ALIVE_TIME = 5 * 1000;
private static ThreadPoolExecutor threadPool = null;
private ThreadPoolUtils() {
throw new IllegalStateException("utility class");
}
/**
* 无返回值直接执行
*
* @param runnable 需要运行的任务
*/
public static void execute(Runnable runnable) {
getThreadPool().execute(runnable);
}
/**
* 有返回值执行主线程中使用Future.get()获取返回值时，会阻塞主线程，直到任务执行完毕
*
* @param callable 需要运行的任务
*/
public static <T> Future<T> submit(Callable<T> callable) {
return getThreadPool().submit(callable);
}
private static synchronized ThreadPoolExecutor getThreadPool() {
if (threadPool == null) {
// 核心线程数、最大线程数、闲置线程存活时间、时间单位、线程队列、线程工厂、当前线程数已经超过最大线程数时的异常处理策略
threadPool = new ThreadPoolExecutor(50, 500, KEEP_ALIVE_TIME, TimeUnit.MILLISECONDS,
new ArrayBlockingQueue<>(BLOCKING_QUEUE_LENGTH),
new ThreadFactoryBuilder().setNameFormat(POOL_NAME + "-%d").build(),
new ThreadPoolExecutor.AbortPolicy() {
@Override
public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {
LOGGER.warn("线程过多，当前运行线程总数：{}，活动线程数：{}。等待队列已满，等待运行任务数：{}", e.getPoolSize(), e.getActiveCount(),
e.getQueue().size());
}
});
}
return threadPool;
}
private static synchronized ThreadPoolExecutor getThreadPoolByCpuNum() {
if (threadPool == null) {
// 获取处理器数量
int cpuNum = Runtime.getRuntime().availableProcessors();
// 根据cpu数量,计算出合理的线程并发数
int maximumPoolSize = cpuNum * 2 + 1;
// 核心线程数、最大线程数、闲置线程存活时间、时间单位、线程队列、线程工厂、当前线程数已经超过最大线程数时的异常处理策略
threadPool = new ThreadPoolExecutor(maximumPoolSize - 1, maximumPoolSize, KEEP_ALIVE_TIME,
TimeUnit.MILLISECONDS, new ArrayBlockingQueue<>(BLOCKING_QUEUE_LENGTH),
new ThreadFactoryBuilder().setNameFormat(POOL_NAME + "-%d").build(),
new ThreadPoolExecutor.AbortPolicy() {
@Override
public void rejectedExecution(Runnable r, ThreadPoolExecutor e) {
LOGGER.warn("线程爆炸了，当前运行线程总数：{}，活动线程数：{}。等待队列已满，等待运行任务数：{}", e.getPoolSize(), e.getActiveCount(),
e.getQueue().size());
}
});
}
return threadPool;
}
}

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