/*
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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 legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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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 legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* 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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* Portions Copyright 2014-2015 ForgeRock AS
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*/
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package org.opends.server.loggers;
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import java.util.Map;
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import org.forgerock.i18n.slf4j.LocalizedLogger;
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/**
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* Class for source-code tracing at the method level.
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*
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* One DebugTracer instance exists for each Java class using tracing.
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* Tracer must be registered with the DebugLogger.
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*
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* Logging is always done at a level basis, with debug log messages
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* exceeding the trace threshold being traced, others being discarded.
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*/
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class DebugTracer
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{
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/** The class this aspect traces. */
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private String className;
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/**
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* A class that represents a settings cache entry.
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*/
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private class PublisherSettings
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{
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DebugLogPublisher<?> debugPublisher;
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TraceSettings classSettings;
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Map<String, TraceSettings> methodSettings;
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}
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private PublisherSettings[] publisherSettings;
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/**
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* Construct a new DebugTracer object with cached settings obtained from
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* the provided array of publishers.
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*
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* @param className The classname to use as category for logging.
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* @param publishers The array of publishers to obtain the settings from.
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*/
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@SuppressWarnings({ "unchecked", "rawtypes" })
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DebugTracer(String className, DebugLogPublisher[] publishers)
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{
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this.className = className;
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publisherSettings = new PublisherSettings[publishers.length];
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// Get the settings from all publishers.
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for(int i = 0; i < publishers.length; i++)
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{
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DebugLogPublisher publisher = publishers[i];
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PublisherSettings settings = new PublisherSettings();
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settings.debugPublisher = publisher;
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settings.classSettings = publisher.getClassSettings(className);
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// For some reason, the compiler doesn't see that
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// debugLogPublihser.getMethodSettings returns a parameterized Map.
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// This problem goes away if a parameterized verson of DebugLogPublisher
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// is used. However, we can't not use reflection to instantiate a generic
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// DebugLogPublisher<? extends DebugLogPublisherCfg> type. The only thing
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// we can do is to just supress the compiler warnings.
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settings.methodSettings = publisher.getMethodSettings(className);
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publisherSettings[i] = settings;
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}
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}
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/**
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* Log the provided message.
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*
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* @param msg
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* message to log.
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*/
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void trace(String msg)
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{
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traceException(msg, null);
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}
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/**
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* Log the provided message and exception.
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*
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* @param msg
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* the message
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* @param exception
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* the exception caught. May be {@code null}.
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*/
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void traceException(String msg, Throwable exception)
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{
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StackTraceElement[] stackTrace = null;
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StackTraceElement[] filteredStackTrace = null;
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StackTraceElement callerFrame = null;
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final boolean hasException = exception != null;
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for (PublisherSettings settings : publisherSettings)
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{
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TraceSettings activeSettings = settings.classSettings;
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Map<String, TraceSettings> methodSettings = settings.methodSettings;
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if (shouldLog(hasException, activeSettings) || methodSettings != null)
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{
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if (stackTrace == null)
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{
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stackTrace = Thread.currentThread().getStackTrace();
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}
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if (callerFrame == null)
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{
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callerFrame = getCallerFrame(stackTrace);
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}
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String signature = callerFrame.getMethodName();
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// Specific method settings still could exist. Try getting
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// the settings for this method.
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if (methodSettings != null)
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{
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TraceSettings mSettings = methodSettings.get(signature);
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if (mSettings == null)
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{
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// Try looking for an undecorated method name
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int idx = signature.indexOf('(');
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if (idx != -1)
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{
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mSettings = methodSettings.get(signature.substring(0, idx));
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}
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}
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// If this method does have a specific setting and it is not
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// suppose to be logged, continue.
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if (mSettings != null)
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{
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if (!shouldLog(hasException, mSettings))
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{
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continue;
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}
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else
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{
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activeSettings = mSettings;
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}
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}
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}
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String sourceLocation =
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callerFrame.getFileName() + ":" + callerFrame.getLineNumber();
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if (filteredStackTrace == null && activeSettings.getStackDepth() > 0)
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{
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StackTraceElement[] trace =
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hasException ? exception.getStackTrace() : stackTrace;
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filteredStackTrace =
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DebugStackTraceFormatter.SMART_FRAME_FILTER
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.getFilteredStackTrace(trace);
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}
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if (hasException)
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{
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settings.debugPublisher.traceException(activeSettings, signature,
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sourceLocation, msg, exception, filteredStackTrace);
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}
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else
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{
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settings.debugPublisher.trace(activeSettings, signature,
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sourceLocation, msg, filteredStackTrace);
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}
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}
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}
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}
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/**
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* Gets the name of the class this tracer traces.
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*
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* @return The name of the class this tracer traces.
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*/
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String getTracedClassName()
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{
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return className;
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}
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/**
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* Indicates if logging is enabled for at least one category
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* in a publisher.
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*
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* @return {@code true} if logging is enabled, false otherwise.
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*/
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boolean enabled()
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{
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for (PublisherSettings settings : publisherSettings)
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{
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if (shouldLog(settings.classSettings) || settings.methodSettings != null)
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{
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return true;
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}
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}
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return false;
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}
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/**
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* Update the cached settings of the tracer with the settings from the
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* provided publishers.
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*
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* @param publishers The array of publishers to obtain the settings from.
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*/
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@SuppressWarnings({ "unchecked", "rawtypes" })
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void updateSettings(DebugLogPublisher[] publishers)
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{
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PublisherSettings[] newSettings =
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new PublisherSettings[publishers.length];
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// Get the settings from all publishers.
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for(int i = 0; i < publishers.length; i++)
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{
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DebugLogPublisher publisher = publishers[i];
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PublisherSettings settings = new PublisherSettings();
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settings.debugPublisher = publisher;
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settings.classSettings = publisher.getClassSettings(className);
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// For some reason, the compiler doesn't see that
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// debugLogPublihser.getMethodSettings returns a parameterized Map.
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// This problem goes away if a parameterized verson of DebugLogPublisher
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// is used. However, we can't not use reflection to instantiate a generic
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// DebugLogPublisher<? extends DebugLogPublisherCfg> type. The only thing
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// we can do is to just supress the compiler warnings.
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settings.methodSettings = publisher.getMethodSettings(className);
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newSettings[i] = settings;
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}
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publisherSettings = newSettings;
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}
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/**
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* Return the caller stack frame.
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*
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* @param stackTrace The entrie stack trace frames.
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* @return the caller stack frame or null if none is found on the
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* stack trace.
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*/
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private StackTraceElement getCallerFrame(StackTraceElement[] stackTrace)
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{
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if (stackTrace != null && stackTrace.length > 0)
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{
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// Skip all logging related classes
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for (StackTraceElement aStackTrace : stackTrace)
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{
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if(!isLoggingStackTraceElement(aStackTrace))
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{
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return aStackTrace;
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}
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}
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}
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return null;
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}
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/**
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* Checks if element belongs to a class responsible for logging
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* (includes the Thread class that may be used to get the stack trace).
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*
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* @param trace
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* the trace element to check.
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* @return {@code true} if element corresponds to logging
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*/
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static boolean isLoggingStackTraceElement(StackTraceElement trace)
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{
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String name = trace.getClassName();
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return name.startsWith(Thread.class.getName())
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|| name.startsWith(DebugTracer.class.getName())
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|| name.startsWith(OpenDJLoggerAdapter.class.getName())
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|| name.startsWith(LocalizedLogger.class.getName());
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}
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/** Indicates if there is something to log. */
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private boolean shouldLog(boolean hasException, TraceSettings activeSettings)
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{
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return activeSettings.getLevel() == TraceSettings.Level.ALL
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|| (hasException && activeSettings.getLevel() == TraceSettings.Level.EXCEPTIONS_ONLY);
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}
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/** Indicates if there is something to log. */
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private boolean shouldLog(TraceSettings settings)
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{
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return settings.getLevel() != TraceSettings.Level.DISABLED;
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}
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}
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