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Foundation API for SEDA-based Servers
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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 David Berkman
 * 
 * This file is part of the SmallMind Code Project.
 * 
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 * 
 * 1) The terms of 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.
 * 
 * ...or...
 * 
 * 2) The terms of the Apache License, Version 2.0.
 * 
 * The SmallMind Code Project 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 or Apache License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 * 
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.seda;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import org.smallmind.scribe.pen.LoggerManager;

public class EventProcessor implements Runnable {

  private CountDownLatch exitLatch;
  private SedaConfiguration sedaConfiguration;
  private EventQueue eventQueue;
  private WorkMonitor monitor;
  private AtomicBoolean stopped = new AtomicBoolean(false);

  public EventProcessor (EventQueue eventQueue, DurationMonitor durationMonitor, SedaConfiguration sedaConfiguration) {

    this.eventQueue = eventQueue;

    monitor = new WorkMonitor(durationMonitor, sedaConfiguration.getWorkTrackingTime(), sedaConfiguration.getWorkTrackingTimeUnit());
    exitLatch = new CountDownLatch(1);
  }

  protected WorkMonitor getMonitor () {

    return monitor;
  }

  public double getIdlePercentage () {

    return monitor.getIdlePercentage();
  }

  public double getActivePercentage () {

    return monitor.getActivePercentage();
  }

  public boolean isRunning () {

    return !stopped.get();
  }

  protected void stop ()
    throws InterruptedException {

    stopped.compareAndSet(false, true);
    exitLatch.await();
  }

  public void run () {

    I inputEvent;
    StopWatch stopWatch = new StopWatch();

    try {
      stopWatch.click();
      while (!stopped.get()) {
        if ((inputEvent = eventQueue.poll(sedaConfiguration.getQueuePollTimeout(), sedaConfiguration.getQueuePollTimeUnit())) != null) {
          monitor.addIdleTime(stopWatch.click());
          //TODO: HandleEvent
          monitor.addActiveTime(stopWatch.click());
        }
        else {
          monitor.addIdleTime(stopWatch.click());
        }
      }
    }
    catch (InterruptedException interruptedException) {
      stopped.compareAndSet(false, true);
      LoggerManager.getLogger(EventProcessor.class).error(interruptedException);
    }
    finally {
      exitLatch.countDown();
    }
  }
}