Executes callable not parallel secured by semaphore - Java java.util.concurrent

Java examples for java.util.concurrent:Semaphore

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Description

Executes callable not parallel secured by semaphore

Demo Code


//package com.java2s;
import java.util.concurrent.Callable;
import java.util.concurrent.Semaphore;

public class Main {
    /**//ww w .  j a  v a2s  .c  o  m
     * Executes callable not parallel secured by semaphore
     * 
     * @param semaphore
     *          semaphore secure
     * @param wait
     *          true: wait if semaphore is not free, false: return immediately
     * @param callable
     *          callable to execute
     * @return result of callable, null if not executed
     * @throws InterruptedException
     *           wait has interrupted
     */
    public static <V> V executeSequencially(final Semaphore semaphore,
            final boolean wait, final Callable<V> callable) {
        if (wait) {
            try {
                semaphore.acquire();
            } catch (final InterruptedException e1) {
                return null;
            }
        } else if (!semaphore.tryAcquire())
            return null;
        try {
            return callable.call();
        } catch (final Throwable e) {
            throw new RuntimeException("Exception in sequencial part", e);
        } finally {
            semaphore.release();
        }
    }
}

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