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package com.github.antelopeframework.util;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;

public class ThreadUtils {

    /**
     * Uses the shutdown pattern from
     * http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ExecutorService.html
     * 
     * @param pool ExecutorService need to shutdown
     * @param period wait time period
     * @param unit wait time unit.
     */
    public static void shutdownAndAwaitTermination(ExecutorService pool, long period, TimeUnit unit) {
        pool.shutdown(); // Disable new tasks from being submitted
        try {
            // Wait a while for existing tasks to terminate
            if (!pool.awaitTermination(period, unit)) {
                pool.shutdownNow(); // Cancel currently executing tasks
                
                // Wait a while for tasks to respond to being cancelled
                if (!pool.awaitTermination(period, unit)) {
                    System.err.println("Pool did not terminate");
                }
            }
        } catch (InterruptedException ie) {
            // (Re-)Cancel if current thread also interrupted
            pool.shutdownNow();
            // Preserve interrupt status
            Thread.currentThread().interrupt();
        }
    }
}