MailHeavy.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.sender;
 
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.string.Strings;
import org.apache.commons.mail.EmailException;
import org.turro.action.queue.NotificationCategory;
import org.turro.annotation.ElephantPlugin;
import org.turro.elephant.context.ElephantContext;
 
@ElephantPlugin(label = "heavy")
public class MailHeavy extends MailPool implements Runnable {
  
  private NotificationCategory category;
  private Object entity;
  private String template, subject, message;
  
  @Override
  protected void doSendTemplate(NotificationCategory category, Object entity, String template, String subject) throws EmailException {
    this.category = category;
    this.entity = entity;
    this.template = template;
    this.subject = subject;
    doBuild();
  }
 
  @Override
  protected void doSend(NotificationCategory category, String subject, String message) {
    this.category = category;
    this.subject = subject;
    this.message = message;
    doBuild();    
  }
 
  private void doBuild() {
    if(onBuild != null) {
      Thread sender = new Thread(this, "HeavySenderTask");
      sender.start();
    }
  }
 
  /* Runnable */
 
  @Override
  public void run() {
    boolean lockAcquired = HEAVY_LOCK.tryLock();
    if(lockAcquired) {
      try {
        if(onStart != null) onStart.accept(MailHeavy.this);
        onBuild.accept(MailHeavy.this);
        if(!Strings.isBlank(template)) {
          super.doSendTemplate(category, entity, template, subject);
        } else {
          super.doSend(category, subject, message);
        }
      } catch (Exception ex) {
        Logger.getLogger(MailHeavy.class.getName()).log(Level.SEVERE, ElephantContext.logMsg("onBuild"), ex);
      } finally {
        HEAVY_LOCK.unlock();
      }
    } else {
      if(onCancel != null) onCancel.accept(MailHeavy.this);
    }
  }
  
  /* Lock for senders */
  
  private static final Lock HEAVY_LOCK = new ReentrantLock();
 
}