/*
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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 2007-2008 Sun Microsystems, Inc.
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*/
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package org.opends.server.loggers.debug;
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import org.opends.messages.Message;
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import java.util.*;
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import java.util.concurrent.CopyOnWriteArrayList;
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import java.util.concurrent.ConcurrentHashMap;
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import java.lang.reflect.Method;
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import java.lang.reflect.InvocationTargetException;
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import org.opends.server.api.DebugLogPublisher;
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import org.opends.server.loggers.*;
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import org.opends.server.types.*;
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import org.opends.server.admin.std.server.DebugLogPublisherCfg;
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import org.opends.server.admin.std.meta.DebugLogPublisherCfgDefn;
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import org.opends.server.admin.server.ConfigurationAddListener;
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import org.opends.server.admin.server.ConfigurationChangeListener;
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import org.opends.server.admin.server.ConfigurationDeleteListener;
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import org.opends.server.admin.ClassPropertyDefinition;
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import org.opends.server.config.ConfigException;
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import org.opends.server.core.DirectoryServer;
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import static org.opends.messages.ConfigMessages.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* A logger for debug and trace logging. DebugLogger provides a debugging
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* management access point. It is used to configure the Tracers, as well as
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* to register a per-class tracer.
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*
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* Various stub debug methods are provided to log different types of debug
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* messages. However, these methods do not contain any actual implementation.
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* Tracer aspects are later weaved to catch alls to these stub methods and
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* do the work of logging the message.
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*
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* DebugLogger is self-initializing.
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*/
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public class DebugLogger implements
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ConfigurationAddListener<DebugLogPublisherCfg>,
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ConfigurationDeleteListener<DebugLogPublisherCfg>,
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ConfigurationChangeListener<DebugLogPublisherCfg>
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{
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//The default level to log constructor exectuions.
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static final LogLevel DEFAULT_CONSTRUCTOR_LEVEL =
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DebugLogLevel.VERBOSE;
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//The default level to log method entry and exit pointcuts.
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static final LogLevel DEFAULT_ENTRY_EXIT_LEVEL =
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DebugLogLevel.VERBOSE;
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//The default level to log method entry and exit pointcuts.
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static final LogLevel DEFAULT_THROWN_LEVEL =
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DebugLogLevel.ERROR;
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// The set of all DebugTracer instances.
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private static ConcurrentHashMap<String, DebugTracer> classTracers =
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new ConcurrentHashMap<String, DebugTracer>();
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// The set of debug loggers that have been registered with the server. It
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// will initially be empty.
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private static CopyOnWriteArrayList<DebugLogPublisher> debugPublishers =
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new CopyOnWriteArrayList<DebugLogPublisher>();
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// Trace methods will use this static boolean to determine if debug is
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// enabled so to not incur the cost of calling debugPublishers.isEmtpty().
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static boolean enabled = false;
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// The singleton instance of this class for configuration purposes.
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static final DebugLogger instance = new DebugLogger();
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/**
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* Add an debug log publisher to the debug logger.
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*
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* @param publisher The error log publisher to add.
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*/
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public synchronized static void addDebugLogPublisher(
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DebugLogPublisher publisher)
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{
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debugPublishers.add(publisher);
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updateTracerSettings();
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enabled = true;
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}
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/**
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* Remove an debug log publisher from the debug logger.
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*
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* @param publisher The debug log publisher to remove.
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* @return The publisher that was removed or null if it was not found.
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*/
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public synchronized static boolean removeDebugLogPublisher(
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DebugLogPublisher publisher)
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{
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boolean removed = debugPublishers.remove(publisher);
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if(removed)
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{
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publisher.close();
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}
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updateTracerSettings();
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if(debugPublishers.isEmpty())
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{
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enabled = false;
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}
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return removed;
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}
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/**
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* Removes all existing debug log publishers from the logger.
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*/
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public synchronized static void removeAllDebugLogPublishers()
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{
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for(DebugLogPublisher publisher : debugPublishers)
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{
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publisher.close();
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}
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debugPublishers.clear();
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updateTracerSettings();
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enabled = false;
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}
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/**
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* Initializes all the debug log publishers.
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*
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* @param configs The debug log publisher configurations.
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* @throws ConfigException
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* If an unrecoverable problem arises in the process of
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* performing the initialization as a result of the server
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* configuration.
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* @throws InitializationException
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* If a problem occurs during initialization that is not
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* related to the server configuration.
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*/
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public void initializeDebugLogger(List<DebugLogPublisherCfg> configs)
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throws ConfigException, InitializationException
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{
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for(DebugLogPublisherCfg config : configs)
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{
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config.addDebugChangeListener(this);
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if(config.isEnabled())
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{
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DebugLogPublisher debugLogPublisher = getDebugPublisher(config);
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addDebugLogPublisher(debugLogPublisher);
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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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public boolean isConfigurationAddAcceptable(DebugLogPublisherCfg config,
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List<Message> unacceptableReasons)
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{
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return !config.isEnabled() ||
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isJavaClassAcceptable(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(DebugLogPublisherCfg config,
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List<Message> unacceptableReasons)
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{
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return !config.isEnabled() ||
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isJavaClassAcceptable(config, unacceptableReasons);
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}
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/**
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* {@inheritDoc}
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*/
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public ConfigChangeResult applyConfigurationAdd(DebugLogPublisherCfg config)
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{
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// Default result code.
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ResultCode resultCode = ResultCode.SUCCESS;
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boolean adminActionRequired = false;
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ArrayList<Message> messages = new ArrayList<Message>();
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config.addDebugChangeListener(this);
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if(config.isEnabled())
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{
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try
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{
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DebugLogPublisher debugLogPublisher =
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getDebugPublisher(config);
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addDebugLogPublisher(debugLogPublisher);
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}
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catch(ConfigException e)
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{
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messages.add(e.getMessageObject());
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resultCode = DirectoryServer.getServerErrorResultCode();
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}
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catch (Exception e)
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{
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messages.add(ERR_CONFIG_LOGGER_CANNOT_CREATE_LOGGER.get(
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String.valueOf(config.dn().toString()),
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stackTraceToSingleLineString(e)));
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resultCode = DirectoryServer.getServerErrorResultCode();
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}
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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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* {@inheritDoc}
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*/
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public ConfigChangeResult applyConfigurationChange(
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DebugLogPublisherCfg config)
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{
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// Default result code.
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ResultCode resultCode = ResultCode.SUCCESS;
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boolean adminActionRequired = false;
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ArrayList<Message> messages = new ArrayList<Message>();
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DN dn = config.dn();
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DebugLogPublisher debugLogPublisher = null;
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for(DebugLogPublisher publisher : debugPublishers)
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{
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if(publisher.getDN().equals(dn))
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{
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debugLogPublisher = publisher;
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}
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}
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if(debugLogPublisher == null)
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{
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if(config.isEnabled())
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{
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// Needs to be added and enabled.
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return applyConfigurationAdd(config);
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}
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}
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else
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{
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if(config.isEnabled())
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{
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// The publisher is currently active, so we don't need to do anything.
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// Changes to the class name cannot be
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// applied dynamically, so if the class name did change then
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// indicate that administrative action is required for that
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// change to take effect.
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String className = config.getJavaClass();
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if(!className.equals(debugLogPublisher.getClass().getName()))
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{
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adminActionRequired = true;
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}
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}
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else
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{
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// The publisher is being disabled so shut down and remove.
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removeDebugLogPublisher(debugLogPublisher);
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}
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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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* {@inheritDoc}
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*/
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public boolean isConfigurationDeleteAcceptable(DebugLogPublisherCfg config,
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List<Message> unacceptableReasons)
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{
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DN dn = config.dn();
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DebugLogPublisher debugLogPublisher = null;
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for(DebugLogPublisher publisher : debugPublishers)
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{
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if(publisher.getDN().equals(dn))
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{
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debugLogPublisher = publisher;
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}
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}
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return debugLogPublisher != null;
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}
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/**
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* {@inheritDoc}
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*/
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public ConfigChangeResult
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applyConfigurationDelete(DebugLogPublisherCfg config)
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{
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// Default result code.
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ResultCode resultCode = ResultCode.SUCCESS;
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boolean adminActionRequired = false;
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DebugLogPublisher debugLogPublisher = null;
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for(DebugLogPublisher publisher : debugPublishers)
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{
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if(publisher.getDN().equals(config.dn()))
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{
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debugLogPublisher = publisher;
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}
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}
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if(debugLogPublisher != null)
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{
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removeDebugLogPublisher(debugLogPublisher);
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}
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else
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{
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resultCode = ResultCode.NO_SUCH_OBJECT;
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}
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return new ConfigChangeResult(resultCode, adminActionRequired);
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}
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private boolean isJavaClassAcceptable(DebugLogPublisherCfg config,
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List<Message> unacceptableReasons)
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{
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String className = config.getJavaClass();
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DebugLogPublisherCfgDefn d = DebugLogPublisherCfgDefn.getInstance();
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ClassPropertyDefinition pd =
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d.getJavaClassPropertyDefinition();
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// Load the class and cast it to a DebugLogPublisher.
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DebugLogPublisher publisher = null;
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Class<? extends DebugLogPublisher> theClass;
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try {
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theClass = pd.loadClass(className, DebugLogPublisher.class);
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publisher = theClass.newInstance();
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} catch (Exception e) {
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Message message = ERR_CONFIG_LOGGER_INVALID_DEBUG_LOGGER_CLASS.get(
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className,
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config.dn().toString(),
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String.valueOf(e));
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unacceptableReasons.add(message);
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return false;
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}
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// Check that the implementation class implements the correct interface.
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try {
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// Determine the initialization method to use: it must take a
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// single parameter which is the exact type of the configuration
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// object.
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Method method = theClass.getMethod("isConfigurationAcceptable",
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DebugLogPublisherCfg.class,
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List.class);
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Boolean acceptable = (Boolean) method.invoke(publisher, config,
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unacceptableReasons);
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if (! acceptable)
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{
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return false;
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}
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} catch (Exception e) {
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Message message = ERR_CONFIG_LOGGER_INVALID_DEBUG_LOGGER_CLASS.get(
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className,
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config.dn().toString(),
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String.valueOf(e));
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unacceptableReasons.add(message);
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return false;
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}
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// The class is valid as far as we can tell.
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return true;
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}
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private DebugLogPublisher getDebugPublisher(DebugLogPublisherCfg config)
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throws ConfigException {
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String className = config.getJavaClass();
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DebugLogPublisherCfgDefn d = DebugLogPublisherCfgDefn.getInstance();
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ClassPropertyDefinition pd =
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d.getJavaClassPropertyDefinition();
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// Load the class and cast it to a DebugLogPublisher.
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Class<? extends DebugLogPublisher> theClass;
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DebugLogPublisher debugLogPublisher;
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try {
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theClass = pd.loadClass(className, DebugLogPublisher.class);
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debugLogPublisher = theClass.newInstance();
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// Determine the initialization method to use: it must take a
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// single parameter which is the exact type of the configuration
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// object.
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Method method = theClass.getMethod("initializeDebugLogPublisher", config
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.configurationClass());
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method.invoke(debugLogPublisher, config);
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}
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catch (InvocationTargetException ite)
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{
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// Rethrow the exceptions thrown be the invoked method.
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Throwable e = ite.getTargetException();
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Message message = ERR_CONFIG_LOGGER_INVALID_DEBUG_LOGGER_CLASS.get(
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className, config.dn().toString(), stackTraceToSingleLineString(e));
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throw new ConfigException(message, e);
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}
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catch (Exception e)
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{
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Message message = ERR_CONFIG_LOGGER_INVALID_DEBUG_LOGGER_CLASS.get(
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className, config.dn().toString(), String.valueOf(e));
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throw new ConfigException(message, e);
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}
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// The debug publisher has been successfully initialized.
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return debugLogPublisher;
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}
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/**
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* Update all debug tracers with the settings in the registered
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* publishers.
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*/
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static void updateTracerSettings()
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{
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DebugLogPublisher[] publishers =
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debugPublishers.toArray(new DebugLogPublisher[0]);
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for(DebugTracer tracer : classTracers.values())
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{
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tracer.updateSettings(publishers);
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}
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}
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/**
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* Indicates if debug logging is enabled.
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*
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* @return True if debug logging is enabled. False otherwise.
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*/
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public static boolean debugEnabled()
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{
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return enabled;
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}
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/**
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* Retrieve the singleton instance of this class.
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*
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* @return The singleton instance of this logger.
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*/
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public static DebugLogger getInstance()
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{
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return instance;
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}
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/**
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* Creates a new Debug Tracer for the caller class and registers it
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* with the Debug Logger.
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*
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* @return The tracer created for the caller class.
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*/
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public static DebugTracer getTracer()
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{
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DebugTracer tracer =
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new DebugTracer(debugPublishers.toArray(new DebugLogPublisher[0]));
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classTracers.put(tracer.getTracedClassName(), tracer);
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return tracer;
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}
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/**
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* Returns the registered Debug Tracer for a traced class.
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*
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* @param className The name of the class tracer to retrieve.
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* @return The tracer for the provided class or null if there are
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* no tracers registered.
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*/
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public static DebugTracer getTracer(String className)
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{
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return classTracers.get(className);
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}
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/**
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* Classes and methods annotated with @NoDebugTracing will not be weaved with
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* debug logging statements by AspectJ.
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*/
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public @interface NoDebugTracing {}
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/**
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* Methods annotated with @NoEntryDebugTracing will not be weaved with
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* entry debug logging statements by AspectJ.
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*/
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public @interface NoEntryDebugTracing {}
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/**
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* Methods annotated with @NoExitDebugTracing will not be weaved with
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* exit debug logging statements by AspectJ.
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*/
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public @interface NoExitDebugTracing {}
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/**
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* Methods annotated with @TraceThrown will be weaved by AspectJ with
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* debug logging statements when an exception is thrown from the method.
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*/
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public @interface TraceThrown {}
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}
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