com.generallycloud.baseio.concurrent.Waiter Maven / Gradle / Ivy

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/*
 * Copyright 2015-2017 GenerallyCloud.com
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 
package com.generallycloud.baseio.concurrent;

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

public class Waiter{

	private ReentrantLock	lock		= new ReentrantLock();
	private Condition		callback	= lock.newCondition();
	private boolean		isDnoe;
	private boolean		timeouted;
	private T				t;
	
	/**
	 * @param timeout
	 * @return timeouted
	 */
	public boolean await() {

		ReentrantLock lock = this.lock;

		lock.lock();

		if (isDnoe) {

			lock.unlock();

			return false;
		}

		try {
			callback.await();
		} catch (InterruptedException e) {
			callback.signal();
		}

		timeouted = !isDnoe;

		lock.unlock();

		return timeouted;
	}
	

	/**
	 * @param timeout
	 * @return timeouted
	 */
	public boolean await(long timeout) {

		ReentrantLock lock = this.lock;

		lock.lock();

		if (isDnoe) {

			lock.unlock();

			return false;
		}

		try {
			callback.await(timeout, TimeUnit.MILLISECONDS);
		} catch (InterruptedException e) {
			callback.signal();
		}

		timeouted = !isDnoe;

		lock.unlock();

		return timeouted;
	}

	public void setPayload(T t) {
		ReentrantLock lock = this.lock;

		lock.lock();

		this.isDnoe = true;

		this.t = t;

		callback.signal();

		lock.unlock();
	}
	
	public boolean isDnoe() {
		return isDnoe;
	}

	public T getPayload() {
		return t;
	}

	public boolean isTimeouted() {
		return timeouted;
	}
}