QueuedSender.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2021 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.mail.queue;
 
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.turro.elephant.context.ElephantContext;
import org.turro.util.AtomicCounter;
 
public abstract class QueuedSender implements Runnable {
 
  public QueuedSender() {
  }
 
  protected abstract void doSend();
  
  public void send() {
    Thread sender = new Thread(this, "QueuedSenderTask");
    sender.start();
  }
  
  public void pause() {
    try {
      Thread.sleep(300);
    } catch (InterruptedException ex) {
      Logger.getLogger(QueuedSender.class.getName()).log(Level.SEVERE, ElephantContext.logMsg("Pausing..."), ex);
    }
  }
  
  /* Runnable */
 
  @Override
  public void run() {
    SENDER_LOCK.lock();
    try {
      openSenders.increment();
      try{
        doSend();
      } catch(Exception ex) {
        Logger.getLogger(QueuedSender.class.getName()).log(Level.SEVERE, ElephantContext.logMsg("Sending..."), ex);
      }
    } finally {
      openSenders.decrement();
      SENDER_LOCK.unlock();
    }
  }
  
  /* Lock for senders */
  
  private static final Lock SENDER_LOCK = new ReentrantLock();
  
  /* Debug */
  
  private static final AtomicCounter openSenders = new AtomicCounter();
 
  public static AtomicCounter getCounter() {
    return openSenders;
  }
 
}