| // |
| // ======================================================================== |
| // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.monitor.jmx; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Timer; |
| import java.util.TimerTask; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.eclipse.jetty.util.log.Log; |
| import org.eclipse.jetty.util.log.Logger; |
| import org.eclipse.jetty.util.thread.ExecutorThreadPool; |
| import org.eclipse.jetty.util.thread.ThreadPool; |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * MonitorTask |
| * |
| * Invokes polling of the JMX server for the MBean attribute values |
| * through executing timer task scheduled using java.util.Timer |
| * at specified poll interval following a specified delay. |
| */ |
| public class MonitorTask extends TimerTask |
| { |
| private static final Logger LOG = Log.getLogger(MonitorTask.class); |
| |
| private static Timer __timer = new Timer(true); |
| private static ThreadPool _callback = new ExecutorThreadPool(4,64,60,TimeUnit.SECONDS);; |
| private static Map<String,TimerTask> __tasks = new HashMap<String,TimerTask>(); |
| |
| private final MonitorAction _action; |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Creates new instance of MonitorTask |
| * |
| * @param action instance of MonitorAction to use |
| */ |
| private MonitorTask(MonitorAction action) |
| { |
| _action = action; |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Schedule new timer task for specified monitor action |
| * |
| * @param action monitor action |
| */ |
| public static void schedule(MonitorAction action) |
| { |
| TimerTask task = new MonitorTask(action); |
| __timer.scheduleAtFixedRate(task, |
| action.getPollDelay(), |
| action.getPollInterval()); |
| |
| __tasks.put(action.getID(), task); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * Cancel timer task for specified monitor action |
| * |
| * @param action monitor action |
| */ |
| public static void cancel(MonitorAction action) |
| { |
| TimerTask task = __tasks.remove(action.getID()); |
| if (task != null) |
| task.cancel(); |
| } |
| |
| /* ------------------------------------------------------------ */ |
| /** |
| * This method is invoked when poll interval has elapsed |
| * to check if the event trigger conditions are satisfied |
| * in order to fire event. |
| * |
| * @see java.util.TimerTask#run() |
| */ |
| @Override |
| public final void run() |
| { |
| final long timestamp = System.currentTimeMillis(); |
| final EventTrigger trigger = _action.getTrigger(); |
| |
| _callback.execute(new Runnable() { |
| public void run() |
| { |
| try |
| { |
| if(trigger.match(timestamp)) |
| _action.doExecute(timestamp); |
| } |
| catch (Exception ex) |
| { |
| LOG.debug(ex); |
| } |
| } |
| }); |
| } |
| } |