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package com.intellifylearning.utils;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

// Thanks to Pelops for implmentation
// MIT License
// from: https://code.google.com/p/pelops/source/browse/trunk/src/org/wyki/concurrency/ManualResetEvent.java?r=2
public class ManualResetEvent {

    private volatile CountDownLatch event;
    private final Object mutex;

    public ManualResetEvent(boolean signalled) {
        mutex = new Object();
        if (signalled) {
            event = new CountDownLatch(0);
        } else {
            event = new CountDownLatch(1);
        }
    }

    public void set() {
        event.countDown();
    }

    public void reset() {
        synchronized (mutex) {
            if (event.getCount() == 0) {
                event = new CountDownLatch(1);
            }
        }
    }

    public void waitOne() throws InterruptedException {
        event.await();
    }

    public boolean waitOne(int timeout, TimeUnit unit)
            throws InterruptedException {
        return event.await(timeout, unit);
    }

    public boolean isSignalled() {
        return event.getCount() == 0;
    }
}