线程池 解析用定制线程池

/**
 * @author keming.chen
 * @date 2021/6/17 17:12
 * @desc 解析用定制线程池
 **/
public class ParseThreadPools {

    /**
     * 默认使用线程数 = cpu核数*2
     */
    public static final int MAX_THREADS = Runtime.getRuntime().availableProcessors();

    public static final int DOCUMENT_CORE_POOL_SIZE = 3;

    public static final ThreadPoolExecutor DOCUMENT_THREAD_POOL = new ThreadPoolExecutor(DOCUMENT_CORE_POOL_SIZE,
            DOCUMENT_CORE_POOL_SIZE,
            30,
            TimeUnit.SECONDS,
            new LinkedBlockingQueue<>(),
            new ParseThreadFactory("document"));

    public static final ThreadPoolExecutor PARSE_THREAD_POOL = new ThreadPoolExecutor(
            MAX_THREADS,
            3 * MAX_THREADS,
            30,
            TimeUnit.SECONDS,
            new LinkedBlockingQueue<>(),
            new ParseThreadFactory("ocr-marking"));

    public static final ScheduledThreadPoolExecutor SCHEDULE_POOL = new ScheduledThreadPoolExecutor(1, new ParseThreadFactory("news-report"));

    public static final ScheduledThreadPoolExecutor SCHEDULE_ANNOUNCE_POOL = new ScheduledThreadPoolExecutor(1, new ParseThreadFactory("parse-announce"));

    public static final ScheduledThreadPoolExecutor SCHEDULE_REPEAT_POOL = new ScheduledThreadPoolExecutor(1, new ParseThreadFactory("data-repeat"));

    public static final ScheduledThreadPoolExecutor SCHEDULE_ELECTION_POOL = new ScheduledThreadPoolExecutor(1, new ParseThreadFactory("election"));

}

文档解析的时候,我们会指定3个核心线程,最大线程也是3,阻塞队列是 LinkedBlockingQueue 

如果不指定线程工厂时，ThreadPoolExecutor 会使用ThreadPoolExecutor.defaultThreadFactory 创建线程。默认工厂创建的线程：同属于相同的线程组，具有同为 Thread.NORM_PRIORITY 的优先级，以及名为 “pool-XXX-thread-” 的线程名（XXX为创建线程时顺序序号），且创建的线程都是非守护进程。