Example usage for java.util.concurrent ThreadPoolExecutor prestartCoreThread

Introduction

In this page you can find the example usage for java.util.concurrent ThreadPoolExecutor prestartCoreThread.

Prototype

public boolean prestartCoreThread() 

Source Link

Document

Starts a core thread, causing it to idly wait for work.

Usage

From source file:org.apache.lens.server.query.QueryExecutionServiceImpl.java

private void startEstimatePool() {
    int minPoolSize = conf.getInt(ESTIMATE_POOL_MIN_THREADS, DEFAULT_ESTIMATE_POOL_MIN_THREADS);
    int maxPoolSize = conf.getInt(ESTIMATE_POOL_MAX_THREADS, DEFAULT_ESTIMATE_POOL_MAX_THREADS);
    int keepAlive = conf.getInt(ESTIMATE_POOL_KEEP_ALIVE_MILLIS, DEFAULT_ESTIMATE_POOL_KEEP_ALIVE_MILLIS);

    final ThreadFactory defaultFactory = Executors.defaultThreadFactory();
    final AtomicInteger thId = new AtomicInteger();
    // We are creating our own thread factory, just so that we can override thread name for easy debugging
    ThreadFactory threadFactory = new ThreadFactory() {
        @Override//from   w  w  w. ja v  a 2s.c  o  m
        public Thread newThread(Runnable r) {
            Thread th = defaultFactory.newThread(r);
            th.setName("estimate-" + thId.incrementAndGet());
            return th;
        }
    };

    log.debug("starting estimate pool");

    ThreadPoolExecutor estimatePool = new ThreadPoolExecutor(minPoolSize, maxPoolSize, keepAlive,
            TimeUnit.MILLISECONDS, new SynchronousQueue<Runnable>(), threadFactory);
    estimatePool.allowCoreThreadTimeOut(false);
    estimatePool.prestartCoreThread();
    this.estimatePool = estimatePool;
}

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From source file:org.apache.lens.server.query.QueryExecutionServiceImpl.java

private void startLauncherPool() {
    int minPoolSize = conf.getInt(LAUNCHER_POOL_MIN_THREADS, DEFAULT_LAUNCHER_POOL_MIN_THREADS);
    int maxPoolSize = conf.getInt(LAUNCHER_POOL_MAX_THREADS, DEFAULT_LAUNCHER_POOL_MAX_THREADS);
    int keepAlive = conf.getInt(LAUNCHER_POOL_KEEP_ALIVE_MILLIS, DEFAULT_LAUNCHER_POOL_KEEP_ALIVE_MILLIS);

    final ThreadFactory defaultFactory = Executors.defaultThreadFactory();
    final AtomicInteger thId = new AtomicInteger();
    // We are creating our own thread factory, just so that we can override thread name for easy debugging
    ThreadFactory threadFactory = new ThreadFactory() {
        @Override//w w w. j  av  a  2  s . com
        public Thread newThread(Runnable r) {
            Thread th = defaultFactory.newThread(r);
            th.setName("launcher-" + thId.incrementAndGet());
            return th;
        }
    };

    log.debug("starting query launcher pool");

    ThreadPoolExecutor launcherPool = new ThreadPoolExecutor(minPoolSize, maxPoolSize, keepAlive,
            TimeUnit.MILLISECONDS, new SynchronousQueue<Runnable>(), threadFactory);
    launcherPool.allowCoreThreadTimeOut(false);
    launcherPool.prestartCoreThread();
    this.queryLauncherPool = launcherPool;
}

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