chinwag-android/app/src/main/java/com/keylesspalace/tusky/CountUpDownLatch.java

/* Copyright 2017 Andrew Dawson
 *
 * This file is part of Tusky.
 *
 * Tusky is free software: you can redistribute it and/or modify it under the terms of the GNU
 * Lesser General Public License as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with Tusky. If
 * not, see <http://www.gnu.org/licenses/>. */

package com.keylesspalace.tusky;

class CountUpDownLatch {
    private int count;

    CountUpDownLatch() {
        this.count = 0;
    }

    synchronized void countDown() {
        count--;
        notifyAll();
    }

    synchronized void countUp() {
        count++;
        notifyAll();
    }

    synchronized void await() throws InterruptedException {
        while (count != 0) {
            wait();
        }
    }
}