/*
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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 2006-2007 Sun Microsystems, Inc.
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*/
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package org.opends.server.plugins.profiler;
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import java.io.File;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Set;
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import org.opends.server.admin.server.ConfigurationChangeListener;
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import org.opends.server.admin.std.meta.PluginCfgDefn;
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import org.opends.server.admin.std.server.PluginCfg;
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import org.opends.server.admin.std.server.ProfilerPluginCfg;
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import org.opends.server.api.plugin.DirectoryServerPlugin;
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import org.opends.server.api.plugin.PluginType;
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import org.opends.server.api.plugin.StartupPluginResult;
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import org.opends.server.config.ConfigException;
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import org.opends.server.types.ConfigChangeResult;
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import org.opends.server.types.DirectoryConfig;
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import org.opends.server.types.DN;
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import org.opends.server.types.ErrorLogCategory;
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import org.opends.server.types.ErrorLogSeverity;
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import org.opends.server.types.ResultCode;
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import org.opends.server.util.TimeThread;
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import org.opends.server.types.DebugLogLevel;
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import static org.opends.server.loggers.ErrorLogger.*;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import org.opends.server.loggers.debug.DebugTracer;
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import static org.opends.server.messages.MessageHandler.*;
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import static org.opends.server.messages.PluginMessages.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* This class defines a Directory Server startup plugin that will register
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* itself as a configurable component that can allow for a simple sample-based
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* profiling mechanism within the Directory Server. When profiling is enabled,
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* the server will periodically (e.g., every few milliseconds) retrieve all the
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* stack traces for all threads in the server and aggregates them so that they
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* can be analyzed to see where the server is spending all of its processing
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* time.
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*/
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public final class ProfilerPlugin
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extends DirectoryServerPlugin<ProfilerPluginCfg>
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implements ConfigurationChangeListener<ProfilerPluginCfg>
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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 value to use for the profiler action when no action is necessary.
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*/
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public static final String PROFILE_ACTION_NONE = "none";
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/**
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* The value to use for the profiler action when it should start capturing
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* information.
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*/
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public static final String PROFILE_ACTION_START = "start";
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/**
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* The value to use for the profiler action when it should stop capturing
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* data and write the information it has collected to disk.
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*/
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public static final String PROFILE_ACTION_STOP = "stop";
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/**
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* The value to use for the profiler action when it should stop capturing
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* data and discard any information that has been collected.
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*/
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public static final String PROFILE_ACTION_CANCEL = "cancel";
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// The DN of the configuration entry for this plugin.
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private DN configEntryDN;
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// The current configuration for this plugin.
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private ProfilerPluginCfg currentConfig;
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// The thread that is actually capturing the profile information.
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private ProfilerThread profilerThread;
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/**
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* Creates a new instance of this Directory Server plugin. Every plugin must
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* implement a default constructor (it is the only one that will be used to
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* create plugins defined in the configuration), and every plugin constructor
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* must call <CODE>super()</CODE> as its first element.
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*/
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public ProfilerPlugin()
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{
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super();
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public final void initializePlugin(Set<PluginType> pluginTypes,
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ProfilerPluginCfg configuration)
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throws ConfigException
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{
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configuration.addProfilerChangeListener(this);
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currentConfig = configuration;
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configEntryDN = configuration.dn();
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// Make sure that this plugin is only registered as a startup plugin.
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if (pluginTypes.isEmpty())
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{
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int msgID = MSGID_PLUGIN_PROFILER_NO_PLUGIN_TYPES;
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String message = getMessage(msgID, String.valueOf(configEntryDN));
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throw new ConfigException(msgID, message);
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}
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else
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{
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for (PluginType t : pluginTypes)
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{
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if (t != PluginType.STARTUP)
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{
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int msgID = MSGID_PLUGIN_PROFILER_INVALID_PLUGIN_TYPE;
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String message = getMessage(msgID, String.valueOf(configEntryDN),
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String.valueOf(t));
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throw new ConfigException(msgID, message);
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}
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}
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}
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// Make sure that the profile directory exists.
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File profileDirectory = getFileForPath(configuration.getProfileDirectory());
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if (! (profileDirectory.exists() && profileDirectory.isDirectory()))
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{
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int msgID = MSGID_PLUGIN_PROFILER_INVALID_PROFILE_DIR;
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String message = getMessage(msgID, profileDirectory.getAbsolutePath(),
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String.valueOf(configEntryDN));
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throw new ConfigException(msgID, message);
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public final void finalizePlugin()
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{
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currentConfig.removeProfilerChangeListener(this);
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// If the profiler thread is still active, then cause it to dump the
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// information it has captured and exit.
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synchronized (this)
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{
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if (profilerThread != null)
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{
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profilerThread.stopProfiling();
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String filename = currentConfig.getProfileDirectory() + File.separator +
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"profile." + TimeThread.getGMTTime();
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try
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{
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profilerThread.writeCaptureData(filename);
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}
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catch (Exception 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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int msgID = MSGID_PLUGIN_PROFILER_CANNOT_WRITE_PROFILE_DATA;
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String message = getMessage(msgID, String.valueOf(configEntryDN),
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filename,
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stackTraceToSingleLineString(e));
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logError(ErrorLogCategory.PLUGIN, ErrorLogSeverity.SEVERE_ERROR,
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message, msgID);
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}
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}
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public final StartupPluginResult doStartup()
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{
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ProfilerPluginCfg config = currentConfig;
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// If the profiler should be started automatically, then do so now.
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if (config.isEnableProfilingOnStartup())
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{
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profilerThread = new ProfilerThread(config.getProfileSampleInterval());
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profilerThread.start();
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}
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return StartupPluginResult.SUCCESS;
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}
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/**
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* {@inheritDoc}
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*/
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@Override()
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public boolean isConfigurationAcceptable(PluginCfg configuration,
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List<String> unacceptableReasons)
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{
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ProfilerPluginCfg config = (ProfilerPluginCfg) configuration;
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return isConfigurationChangeAcceptable(config, unacceptableReasons);
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}
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/**
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* {@inheritDoc}
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*/
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public boolean isConfigurationChangeAcceptable(
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ProfilerPluginCfg configuration,
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List<String> unacceptableReasons)
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{
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boolean configAcceptable = true;
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DN cfgEntryDN = configuration.dn();
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// Make sure that the plugin is only registered as a startup plugin.
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if (configuration.getPluginType().isEmpty())
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{
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int msgID = MSGID_PLUGIN_PROFILER_NO_PLUGIN_TYPES;
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String message = getMessage(msgID, String.valueOf(cfgEntryDN));
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unacceptableReasons.add(message);
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configAcceptable = false;
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}
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else
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{
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for (PluginCfgDefn.PluginType t : configuration.getPluginType())
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{
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if (t != PluginCfgDefn.PluginType.STARTUP)
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{
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int msgID = MSGID_PLUGIN_PROFILER_INVALID_PLUGIN_TYPE;
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String message = getMessage(msgID, String.valueOf(cfgEntryDN),
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String.valueOf(t));
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unacceptableReasons.add(message);
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configAcceptable = false;
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break;
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}
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}
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}
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// Make sure that the profile directory exists.
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File profileDirectory = getFileForPath(configuration.getProfileDirectory());
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if (! (profileDirectory.exists() && profileDirectory.isDirectory()))
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{
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int msgID = MSGID_PLUGIN_PROFILER_INVALID_PROFILE_DIR;
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unacceptableReasons.add(getMessage(msgID,
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profileDirectory.getAbsolutePath(),
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String.valueOf(cfgEntryDN)));
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configAcceptable = false;
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}
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return configAcceptable;
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}
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/**
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* Applies the configuration changes to this change listener.
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*
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* @param configuration
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* The new configuration containing the changes.
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* @return Returns information about the result of changing the
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* configuration.
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*/
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public ConfigChangeResult applyConfigurationChange(
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ProfilerPluginCfg configuration)
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{
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ResultCode resultCode = ResultCode.SUCCESS;
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boolean adminActionRequired = false;
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ArrayList<String> messages = new ArrayList<String>();
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currentConfig = configuration;
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// See if we need to perform any action.
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switch (configuration.getProfileAction())
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{
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case START:
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// See if the profiler thread is running. If so, then don't do
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// anything. Otherwise, start it.
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synchronized (this)
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{
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if (profilerThread == null)
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{
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profilerThread =
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new ProfilerThread(configuration.getProfileSampleInterval());
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profilerThread.start();
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int msgID = MSGID_PLUGIN_PROFILER_STARTED_PROFILING;
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messages.add(getMessage(msgID, String.valueOf(configEntryDN)));
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}
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else
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{
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int msgID = MSGID_PLUGIN_PROFILER_ALREADY_PROFILING;
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messages.add(getMessage(msgID, String.valueOf(configEntryDN)));
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}
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}
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break;
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case STOP:
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// See if the profiler thread is running. If so, then stop it and write
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// the information captured to disk. Otherwise, don't do anything.
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synchronized (this)
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{
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if (profilerThread == null)
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{
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int msgID = MSGID_PLUGIN_PROFILER_NOT_RUNNING;
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messages.add(getMessage(msgID, String.valueOf(configEntryDN)));
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}
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else
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{
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profilerThread.stopProfiling();
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int msgID = MSGID_PLUGIN_PROFILER_STOPPED_PROFILING;
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messages.add(getMessage(msgID, String.valueOf(configEntryDN)));
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String filename =
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getFileForPath(
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configuration.getProfileDirectory()).getAbsolutePath() +
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File.separator + "profile." + TimeThread.getGMTTime();
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try
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{
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profilerThread.writeCaptureData(filename);
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msgID = MSGID_PLUGIN_PROFILER_WROTE_PROFILE_DATA;
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messages.add(getMessage(msgID, String.valueOf(configEntryDN),
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filename));
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}
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catch (Exception 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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msgID = MSGID_PLUGIN_PROFILER_CANNOT_WRITE_PROFILE_DATA;
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messages.add(getMessage(msgID, String.valueOf(configEntryDN),
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filename,
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stackTraceToSingleLineString(e)));
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resultCode = DirectoryConfig.getServerErrorResultCode();
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}
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profilerThread = null;
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}
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}
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break;
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case CANCEL:
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// See if the profiler thread is running. If so, then stop it but don't
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// write anything to disk. Otherwise, don't do anything.
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synchronized (this)
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{
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if (profilerThread == null)
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{
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int msgID = MSGID_PLUGIN_PROFILER_NOT_RUNNING;
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messages.add(getMessage(msgID, String.valueOf(configEntryDN)));
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}
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else
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{
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profilerThread.stopProfiling();
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int msgID = MSGID_PLUGIN_PROFILER_STOPPED_PROFILING;
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messages.add(getMessage(msgID, String.valueOf(configEntryDN)));
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profilerThread = null;
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}
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}
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break;
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}
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return new ConfigChangeResult(resultCode, adminActionRequired, messages);
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}
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}
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