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QuestDB is High Performance Time Series Database

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 * Copyright (C) 2014-2016 Appsicle
 *
 * This program is free software: you can redistribute it and/or  modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program 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 Affero General Public License for more details.
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package com.questdb.mp;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class BlockingWaitStrategy extends AbstractWaitStrategy {
    private final Lock lock = new ReentrantLock();
    private final Condition condition = lock.newCondition();

    @Override
    public boolean acceptSignal() {
        return true;
    }

    @Override
    public void await() {
        lock.lock();
        try {
            if (alerted) {
                throw AlertedException.INSTANCE;
            }
            condition.awaitUninterruptibly();
        } finally {
            lock.unlock();
        }
    }

    @Override
    public void signal() {
        lock.lock();
        try {
            condition.signalAll();
        } finally {
            lock.unlock();
        }

    }
}