/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying * information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Portions Copyright 2006 Sun Microsystems, Inc.
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*/
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package org.opends.server.backends.task;
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import org.opends.server.api.DirectoryThread;
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import org.opends.server.types.ErrorLogSeverity;
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import static org.opends.server.loggers.Debug.*;
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import static org.opends.server.messages.BackendMessages.*;
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import static org.opends.server.messages.MessageHandler.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* This class defines a thread that will be used to execute a scheduled task
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* within the server and provide appropriate notification that the task is
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* complete.
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*/
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public class TaskThread
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extends DirectoryThread
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{
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/**
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* The fully-qualified name of this class for debugging purposes.
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*/
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private static final String CLASS_NAME =
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"org.opends.server.backends.task.TaskThread";
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// Indicates whether a request has been made for this thread to exit.
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private boolean exitRequested;
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// The thread ID for this task thread.
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private int threadID;
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// The task currently being processed by this thread.
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private Task task;
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// The reference to the scheduler with which this thread is associated.
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private TaskScheduler taskScheduler;
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// The object that will be used for signaling the thread when there is new
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// work to perform.
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private Object notifyLock;
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/**
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* Creates a new task thread with the provided information.
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*
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* @param taskScheduler The reference to the task scheduler with which this
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* thread is associated.
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* @param threadID The ID assigned to this task thread.
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*/
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public TaskThread(TaskScheduler taskScheduler, int threadID)
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{
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super("Task Thread " + threadID);
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assert debugConstructor(CLASS_NAME, String.valueOf(taskScheduler),
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String.valueOf(threadID));
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this.taskScheduler = taskScheduler;
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this.threadID = threadID;
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task = null;
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notifyLock = new Object();
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exitRequested = false;
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}
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/**
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* Retrieves the task currently being processed by this thread, if it is
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* active.
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*
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* @return The task currently being processed by this thread, or
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* <CODE>null</CODE> if it is not processing any task.
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*/
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public Task getTask()
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{
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assert debugEnter(CLASS_NAME, "getTask");
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return task;
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}
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/**
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* Provides a new task for processing by this thread. This does not do any
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* check to ensure that no task is already in process.
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*
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* @param task The task to be processed.
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*/
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public void setTask(Task task)
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{
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assert debugEnter(CLASS_NAME, "setTask", String.valueOf(task));
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this.task = task;
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synchronized (notifyLock)
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{
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notifyLock.notify();
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}
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}
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/**
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* Attempts to interrupt processing on the task in progress.
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*
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* @param interruptState The state to use for the task if it is
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* successfully interrupted.
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* @param interruptReason The human-readable reason that the task is to be
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* interrupted.
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* @param exitThread Indicates whether this thread should exit when
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* processing on the active task has completed.
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*/
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public void interruptTask(TaskState interruptState, String interruptReason,
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boolean exitThread)
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{
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assert debugEnter(CLASS_NAME, "interruptTask", String.valueOf(exitThread));
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if (task != null)
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{
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try
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{
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task.interruptTask(interruptState, interruptReason);
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}
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catch (Exception e)
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{
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assert debugException(CLASS_NAME, "interruptTask", e);
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}
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}
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if (exitThread)
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{
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exitRequested = true;
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}
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}
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/**
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* Operates in a loop, sleeping until there is no work to do, then
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* processing the task and returning to the scheduler for more work.
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*/
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public void run()
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{
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assert debugEnter(CLASS_NAME, "run");
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while (! exitRequested)
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{
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if (task == null)
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{
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try
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{
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synchronized (notifyLock)
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{
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notifyLock.wait(5000);
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}
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}
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catch (InterruptedException ie)
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{
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assert debugException(CLASS_NAME, "run", ie);
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}
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continue;
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}
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try
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{
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TaskState returnState = task.execute();
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task.setTaskState(returnState);
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}
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catch (Exception e)
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{
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assert debugException(CLASS_NAME, "run", e);
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int msgID = MSGID_TASK_EXECUTE_FAILED;
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String message = getMessage(msgID,
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String.valueOf(task.getTaskEntry().getDN()),
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stackTraceToSingleLineString(e));
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task.addLogMessage(ErrorLogSeverity.FATAL_ERROR, msgID, message);
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task.setTaskState(TaskState.STOPPED_BY_ERROR);
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}
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Task completedTask = task;
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task = null;
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if (! taskScheduler.threadDone(this, completedTask))
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{
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exitRequested = true;
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break;
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}
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}
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if (task != null)
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{
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task.setTaskState(TaskState.STOPPED_BY_SHUTDOWN);
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taskScheduler.threadDone(this, task);
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}
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}
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}
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