/*
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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 2006-2008 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 static org.opends.server.util.ServerConstants.EOL;
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/**
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* A DebugStackTraceFormatter converts an exception's stack trace into a String
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* appropriate for tracing, optionally performing filtering of stack frames.
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*/
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class DebugStackTraceFormatter
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{
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/**
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* The stack depth value to indicate the entire stack should be printed.
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*/
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public static final int COMPLETE_STACK = Integer.MAX_VALUE;
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/**
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* A nested frame filter that removes debug and trailing no OpenDS frames.
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*/
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public static final FrameFilter SMART_FRAME_FILTER = new SmartFrameFilter();
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/**
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* A FrameFilter provides stack frame filtering used during formatting.
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*/
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interface FrameFilter
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{
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/**
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* Filters out all undesired stack frames from the given Throwable's stack
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* trace.
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*
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* @param frames
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* the frames to filter
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* @return an array of StackTraceElements to be used in formatting.
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*/
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StackTraceElement[] getFilteredStackTrace(StackTraceElement[] frames);
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}
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/**
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* A basic FrameFilter that filters out frames from the debug logging and non
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* OpenDS classes.
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*/
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private static class SmartFrameFilter implements FrameFilter
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{
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private boolean isFrameForPackage(StackTraceElement frame,
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String packageName)
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{
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boolean isContained = false;
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if (frame != null)
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{
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String className = frame.getClassName();
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isContained = className != null && className.startsWith(packageName);
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}
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return isContained;
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}
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/**
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* Return the stack trace of an exception with debug and trailing non OpenDS
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* frames filtered out.
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*
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* @param frames
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* the frames to filter
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* @return the filtered stack trace.
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*/
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public StackTraceElement[] getFilteredStackTrace(StackTraceElement[] frames)
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{
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StackTraceElement[] trimmedStack = null;
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if (frames != null && frames.length > 0)
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{
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int firstFrame = 0;
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// Skip leading frames debug logging classes
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while (firstFrame < frames.length
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&& DebugTracer.isLoggingStackTraceElement(frames[firstFrame]))
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{
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firstFrame++;
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}
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// Skip trailing frames not in OpenDS classes
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int lastFrame = frames.length - 1;
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while (lastFrame > firstFrame
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&& !isFrameForPackage(frames[lastFrame], "org.opends"))
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{
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lastFrame--;
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}
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trimmedStack = new StackTraceElement[lastFrame - firstFrame + 1];
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for (int i = firstFrame; i <= lastFrame; i++)
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{
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trimmedStack[i - firstFrame] = frames[i];
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}
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}
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return trimmedStack;
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}
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}
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/**
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* Generate a String representation of the entire stack trace of the given
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* Throwable.
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*
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* @param t
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* - the Throwable for which to generate the stack trace.
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* @return the stack trace.
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*/
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public static String formatStackTrace(Throwable t)
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{
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return formatStackTrace(t, COMPLETE_STACK, true);
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}
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/**
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* Generate a String representation of the possibly filtered stack trace of
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* the given Throwable.
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*
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* @param t
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* - the Throwable for which to generate the stack trace.
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* @param maxDepth
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* - the maximum number of stack frames to include in the trace.
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* @param includeCause
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* - also include the stack trace for the cause Throwable.
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* @return the stack trace.
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*/
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static String formatStackTrace(Throwable t, int maxDepth, boolean includeCause)
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{
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StringBuilder buffer = new StringBuilder();
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StackTraceElement[] trace = t.getStackTrace();
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int frameLimit = Math.min(maxDepth, trace.length);
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for (int i = 0; i < frameLimit; i++)
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{
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buffer.append(" at ");
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buffer.append(trace[i]);
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buffer.append(EOL);
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}
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if (frameLimit < trace.length)
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{
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buffer.append(" ... ");
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buffer.append(trace.length - frameLimit);
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buffer.append(" more");
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buffer.append(EOL);
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}
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if (includeCause)
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{
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Throwable ourCause = t.getCause();
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if (ourCause != null)
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{
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formatStackTraceForCause(ourCause, maxDepth, buffer, trace);
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}
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}
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return buffer.toString();
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}
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private static void formatStackTraceForCause(Throwable t, int maxDepth,
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StringBuilder buffer, StackTraceElement[] causedTrace)
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{
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StackTraceElement[] trace = t.getStackTrace();
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int framesToSkip = Math.max(trace.length - maxDepth, 0);
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// Compute number of frames in common between this and caused
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int m = trace.length - 1 - framesToSkip;
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int n = causedTrace.length - 1 - framesToSkip;
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while (m >= 0 && n >= 0 && trace[m].equals(causedTrace[n]))
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{
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m--;
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n--;
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}
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framesToSkip = trace.length - 1 - m;
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buffer.append("Caused by: ");
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buffer.append(t);
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buffer.append(EOL);
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for (int i = 0; i <= m; i++)
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{
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buffer.append(" at ");
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buffer.append(trace[i]);
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buffer.append(EOL);
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}
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if (framesToSkip != 0)
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{
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buffer.append(" ... ");
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buffer.append(framesToSkip);
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buffer.append(" more");
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buffer.append(EOL);
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}
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// Recurse if we have a cause
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Throwable ourCause = t.getCause();
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if (ourCause != null)
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formatStackTraceForCause(ourCause, maxDepth, buffer, trace);
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}
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/**
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* Generate a String representation of the possibly filtered stack trace from
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* the current position in executation.
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*
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* @param stackTrace
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* - The stack trace elements to format.
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* @param maxDepth
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* - the maximum number of stack frames to include in the trace.
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* @return the stack trace.
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*/
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static String formatStackTrace(StackTraceElement[] stackTrace, int maxDepth)
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{
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StringBuilder buffer = new StringBuilder();
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if (stackTrace != null)
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{
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int frameLimit = Math.min(maxDepth, stackTrace.length);
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if (frameLimit > 0)
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{
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for (int i = 0; i < frameLimit; i++)
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{
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buffer.append(" ");
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buffer.append(stackTrace[i]);
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buffer.append(EOL);
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}
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if (frameLimit < stackTrace.length)
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{
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buffer.append(" ...(");
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buffer.append(stackTrace.length - frameLimit);
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buffer.append(" more)");
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buffer.append(EOL);
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}
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}
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}
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return buffer.toString();
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}
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}
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