com.krawler.notify.email.PausableEmailSender.java Source code

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Here is the source code for com.krawler.notify.email.PausableEmailSender.java

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/*
 * Copyright (C) 2012  Krawler Information Systems Pvt Ltd
 * All rights reserved.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
package com.krawler.notify.email;

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

import javax.mail.Message;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.krawler.notify.NotificationException;

public class PausableEmailSender extends SimpleEmailSender {
    private ReentrantLock pauseLock = new ReentrantLock();
    private Condition unpaused = pauseLock.newCondition();
    private long pauseTime = 0;
    private long pauseSize = 0;
    private long pauseCounter = 0;
    private Log logger = LogFactory.getLog(PausableEmailSender.class);
    private boolean paused = false;

    public void setPauseTime(long pauseTime) {
        this.pauseTime = pauseTime;
    }

    public void setPauseSize(long pauseSize) {
        this.pauseSize = pauseSize;
    }

    public boolean isPaused() {
        return paused;
    }

    @Override
    public void send(Message msg) throws NotificationException {
        pauseLock.lock();
        try {
            if (pauseSize > 0 && pauseCounter == pauseSize) {
                paused = true;
                logger.debug("Wait Start");
                unpaused.await(pauseTime, TimeUnit.MILLISECONDS);
                pauseCounter = 0;
                logger.debug("Wait End");
            }
        } catch (InterruptedException ie) {
            logger.warn("Pause Interrupted", ie);
            Thread.currentThread().interrupt();
        } finally {
            paused = false;
            pauseCounter++;
            pauseLock.unlock();
        }

        super.send(msg);
    }
}