java LimitedThreadPool

FrankYou發表於2018-08-23
JavaMITthread

此執行緒池一直增長，直到上限，增長後不收縮（因為池子裡面的執行緒是永生的）。這個keepAliveTime引數設定的為Long.MAX_VALUE，所以池子裡面的執行緒幾乎不會因為idle而被terminate，也就是說只要執行緒被建立並放到池子裡面永遠不會被銷燬，永生。

    /**
     * 此執行緒池一直增長，直到上限，增長後不收縮。
     * */
    public class LimitedThreadPool implements ThreadPool {
        public static final int DEFAULT_CORE_THREADS = 0;
        public static final int DEFAULT_THREADS = 200;
        public static final int DEFAULT_QUEUES = 0;

        public Executor getExecutor(URL url) {
            String name = url.getParameter(Constants.THREAD_NAME_KEY, Constants.DEFAULT_THREAD_NAME);
            int cores = url.getParameter(Constants.CORE_THREADS_KEY, Constants.DEFAULT_CORE_THREADS);
            int threads = url.getParameter(Constants.THREADS_KEY, Constants.DEFAULT_THREADS);
            int queues = url.getParameter(Constants.QUEUES_KEY, Constants.DEFAULT_QUEUES);
            return new ThreadPoolExecutor(cores, threads, Long.MAX_VALUE, TimeUnit.MILLISECONDS,
                    queues == 0 ? new SynchronousQueue<Runnable>()
                            : (queues < 0 ? new LinkedBlockingQueue<Runnable>()
                                    : new LinkedBlockingQueue<Runnable>(queues)),
                    new NamedThreadFactory(name, true), new AbortPolicyWithReport(name, url));
        }

    }

 

public interface ThreadPool {
    
    /**
     * 執行緒池
     * 
     * @param url 執行緒引數
     * @return 執行緒池
     */
    @Adaptive({Constants.THREADPOOL_KEY})
    Executor getExecutor(URL url);

}

 

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