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/**
 * Copyright (C) 2010 Daniel Manzke 
 *
 * 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.
 */
//
// JODConverter - Java OpenDocument Converter
// Copyright 2009 Art of Solving Ltd
// Copyright 2004-2009 Mirko Nasato
//
// JODConverter 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.
//
// JODConverter 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 JODConverter.  If not, see
// .
//
package org.artofsolving.jodconverter.office;

import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

class SuspendableThreadPoolExecutor extends ThreadPoolExecutor {

    private boolean available = false;
    private ReentrantLock suspendLock = new ReentrantLock();
    private Condition availableCondition = suspendLock.newCondition();

    public SuspendableThreadPoolExecutor(ThreadFactory threadFactory) {
        super(1, 1, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue(), threadFactory);
    }

    @Override
    protected void beforeExecute(Thread thread, Runnable task) {
        super.beforeExecute(thread, task);
        suspendLock.lock();
        try {
            while (!available) {
                availableCondition.await();
            }
        } catch (InterruptedException interruptedException) {
            thread.interrupt();
        } finally {
            suspendLock.unlock();
        }
    }

    public void setAvailable(boolean available) {
        suspendLock.lock();
        try {
            this.available = available;
            if (available) {
                availableCondition.signalAll();
            }
        } finally {
            suspendLock.unlock();
        }
    }

}