/*
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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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* Copyright 2006-2009 Sun Microsystems, Inc.
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*/
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package org.opends.server.api;
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import java.util.Map;
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import java.util.LinkedHashMap;
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import java.util.concurrent.ThreadFactory;
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import java.util.concurrent.atomic.AtomicInteger;
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import org.opends.server.backends.task.Task;
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import org.opends.server.core.DirectoryServer;
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import static org.opends.server.loggers.debug.DebugLogger.
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debugEnabled;
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import static org.opends.server.loggers.debug.DebugLogger.getTracer;
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import org.opends.server.loggers.debug.DebugTracer;
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import static org.opends.server.loggers.ErrorLogger.logError;
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import org.opends.server.types.DebugLogLevel;
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import org.opends.server.types.DN;
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import static org.opends.server.util.StaticUtils.stackTraceToString;
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import static org.opends.server.util.ServerConstants.
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ALERT_TYPE_UNCAUGHT_EXCEPTION;
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import static org.opends.server.util.ServerConstants.
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ALERT_DESCRIPTION_UNCAUGHT_EXCEPTION;
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import org.opends.messages.Message;
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import static org.opends.messages.CoreMessages.
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ERR_UNCAUGHT_THREAD_EXCEPTION;
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/**
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* This class defines a generic thread that should be the superclass
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* for all threads created by the Directory Server. That is, instead
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* of having a class that "extends Thread", you should make it
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* "extends DirectoryThread". This provides various value-added
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* capabilities, including:
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* <BR>
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* <UL>
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* <LI>It helps make sure that all threads have a human-readable
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* name so they are easier to identify in stack traces.</LI>
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* <LI>It can capture a stack trace from the time that this thread
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* was created that could be useful for debugging purposes.</LI>
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* <LI>It plays an important role in ensuring that log messages
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* generated as part of the processing for Directory Server
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* tasks are properly captured and made available as part of
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* that task.</LI>
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* </UL>
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*/
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@org.opends.server.types.PublicAPI(
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stability=org.opends.server.types.StabilityLevel.VOLATILE,
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mayInstantiate=true,
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mayExtend=true,
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mayInvoke=true)
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public class DirectoryThread
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extends Thread
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{
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/**
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* A factory which can be used by thread pool based services such as
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* {@code Executor}s to dynamically create new
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* {@code DirectoryThread} instances.
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*/
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public static final class Factory implements ThreadFactory
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{
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// The name prefix used for all threads created using this
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// factory.
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private final String threadNamePrefix;
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// The ID to use for the next thread created using this factory.
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private final AtomicInteger nextID = new AtomicInteger();
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/**
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* Creates a new directory thread factory using the provided
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* thread name prefix.
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*
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* @param threadNamePrefix
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* The name prefix used for all threads created using
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* this factory.
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*/
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public Factory(String threadNamePrefix)
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{
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if (threadNamePrefix == null) {
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throw new NullPointerException("Null thread name prefix");
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}
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this.threadNamePrefix = threadNamePrefix;
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}
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/**
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* {@inheritDoc}
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*/
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public Thread newThread(Runnable r)
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{
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return new DirectoryThread(r, threadNamePrefix + " "
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+ nextID.getAndIncrement());
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}
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}
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/**
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* The tracer object for the debug logger.
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*/
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private static final DebugTracer TRACER = getTracer();
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/**
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* The directory thread group that all directory threads will be a
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* member of.
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*/
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public static final DirectoryThreadGroup DIRECTORY_THREAD_GROUP =
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new DirectoryThreadGroup();
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// The stack trace taken at the time that this thread was created.
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private StackTraceElement[] creationStackTrace;
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// The task with which this thread is associated, if any.
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private Task task;
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// A reference to the thread that was used to create this thread.
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private Thread parentThread;
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/**
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* A thread group for all directory threads. This implements a
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* custom unhandledException handler that logs the error.
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*/
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private static class DirectoryThreadGroup extends ThreadGroup
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implements AlertGenerator
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{
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private final LinkedHashMap<String,String> alerts;
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/**
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* Private constructor for DirectoryThreadGroup.
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*/
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private DirectoryThreadGroup()
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{
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super("Directory Server Thread Group");
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alerts = new LinkedHashMap<String,String>();
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alerts.put(ALERT_TYPE_UNCAUGHT_EXCEPTION,
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ALERT_DESCRIPTION_UNCAUGHT_EXCEPTION);
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}
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/**
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* {@inheritDoc}
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*/
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public DN getComponentEntryDN() {
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return DN.NULL_DN;
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}
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/**
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* {@inheritDoc}
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*/
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public String getClassName() {
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return "org.oepnds.server.api.DirectoryThread";
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}
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/**
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* {@inheritDoc}
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*/
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public LinkedHashMap<String, String> getAlerts() {
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return alerts;
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}
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/**
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* Provides a means of handling a case in which a thread is about
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* to die because of an unhandled exception. This method does
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* nothing to try to prevent the death of that thread, but will
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* at least log it so that it can be available for debugging
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* purposes.
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*
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* @param t The thread that threw the exception.
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* @param e The exception that was thrown but not properly
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* handled.
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*/
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@Override
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public void uncaughtException(Thread t, Throwable e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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Message message = ERR_UNCAUGHT_THREAD_EXCEPTION.get(
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t.getName(), stackTraceToString(e));
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logError(message);
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DirectoryServer.sendAlertNotification(this,
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ALERT_TYPE_UNCAUGHT_EXCEPTION, message);
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}
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}
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/**
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* Creates a new instance of this directory thread with the
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* specified name and with the specified target as its run object.
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*
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* @param target The target runnable object.
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* @param threadName The human-readable name to use for this
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* thread for debugging purposes.
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*/
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public DirectoryThread(Runnable target, String threadName)
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{
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super (DIRECTORY_THREAD_GROUP, target,
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threadName);
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init();
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}
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/**
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* Creates a new instance of this directory thread with the
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* specified name.
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*
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* @param threadName The human-readable name to use for this
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* thread for debugging purposes.
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*/
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protected DirectoryThread(String threadName)
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{
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super(DIRECTORY_THREAD_GROUP, threadName);
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init();
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}
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/**
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* private method used to factorize constructor initialization.
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*/
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private void init()
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{
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parentThread = currentThread();
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creationStackTrace = parentThread.getStackTrace();
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if (parentThread instanceof DirectoryThread)
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{
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task = ((DirectoryThread) parentThread).task;
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}
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else
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{
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task = null;
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}
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if (DirectoryServer.getEnvironmentConfig().forceDaemonThreads())
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{
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setDaemon(true);
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}
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}
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/**
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* Retrieves the stack trace that was captured at the time that this
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* thread was created.
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*
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* @return The stack trace that was captured at the time that this
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* thread was created.
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*/
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public StackTraceElement[] getCreationStackTrace()
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{
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return creationStackTrace;
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}
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/**
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* Retrieves a reference to the parent thread that created this
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* directory thread. That parent thread may or may not be a
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* directory thread.
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*
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* @return A reference to the parent thread that created this
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* directory thread.
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*/
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public Thread getParentThread()
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{
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return parentThread;
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}
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/**
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* Retrieves the task with which this thread is associated. This
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* will only be available for threads that are used in the process
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* of running a task.
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*
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* @return The task with which this thread is associated, or
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* {@code null} if there is none.
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*/
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public Task getAssociatedTask()
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{
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return task;
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}
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/**
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* Sets the task with which this thread is associated. It may be
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* {@code null} to indicate that it is not associated with any task.
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*
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* @param task The task with which this thread is associated.
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*/
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public void setAssociatedTask(Task task)
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{
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this.task = task;
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}
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/**
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* Retrieves any relevent debug information with which this tread is
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* associated so they can be included in debug messages.
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*
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* @return debug information about this thread as a string.
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*/
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public Map<String, String> getDebugProperties()
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{
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LinkedHashMap<String, String> properties =
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new LinkedHashMap<String, String>();
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properties.put("parentThread", parentThread.getName() +
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"(" + parentThread.getId() + ")");
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properties.put("isDaemon", String.valueOf(this.isDaemon()));
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return properties;
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}
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}
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