| package org.apache.commons.jcs; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| import org.apache.log4j.Category; |
| |
| /** |
| * This class provides support for printing trace messages into a |
| * log4j category. |
| * |
| * The messages are appended with the string representation of the objects |
| * whose constructors and methods are being traced. |
| * |
| * @author <a href="mailto:jvanzyl@zenplex.com">Jason van Zyl</a> |
| * @author <a href="mailto:james@jamestaylor.org">James Taylor</a> |
| * @version $Id$ |
| */ |
| public aspect TraceJCS |
| { |
| /* |
| * Functional part |
| */ |
| |
| /** |
| * There are 3 trace levels (values of TRACELEVEL): |
| * |
| * 0 - No messages are printed |
| * 1 - Trace messages are printed, but there is no indentation |
| * according to the call stack |
| * 2 - Trace messages are printed, and they are indented |
| * according to the call stack |
| */ |
| public static int TRACELEVEL = 2; |
| |
| /** |
| * Tracks the call depth for indented traces made according |
| * to the structure of the stack. |
| */ |
| protected static int callDepth = 0; |
| |
| /** |
| * Log4j category used for tracing. |
| */ |
| private static Category log = Category.getInstance( TraceJCS.class ); |
| |
| /** |
| * Tracing method used in before advice. |
| */ |
| protected static void traceEntry(String str, Object o) |
| { |
| if (TRACELEVEL == 0) |
| { |
| return; |
| } |
| |
| if (TRACELEVEL == 2) |
| { |
| callDepth++; |
| } |
| printEntering(str + ": " + o.toString()); |
| } |
| |
| /** |
| * Tracing method used in after advice. |
| */ |
| protected static void traceExit(String str, Object o) |
| { |
| if (TRACELEVEL == 0) |
| { |
| return; |
| } |
| |
| printExiting(str + ": " + o.toString()); |
| |
| if (TRACELEVEL == 2) |
| { |
| callDepth--; |
| } |
| } |
| |
| private static void printEntering(String str) |
| { |
| log.debug(indent() + "--> " + str); |
| } |
| |
| private static void printExiting(String str) |
| { |
| log.debug(indent() + "<-- " + str); |
| } |
| |
| private static String indent() |
| { |
| StringBuffer sb = new StringBuffer(); |
| |
| for (int i = 0; i < callDepth; i++) |
| { |
| sb.append(" "); |
| } |
| |
| return sb.toString(); |
| } |
| |
| /* |
| * Crosscut part |
| */ |
| |
| /** |
| * JCS Application classes |
| */ |
| pointcut myClass(Object obj): this(obj) && |
| (within(org.apache.stratum.jcs..*)); |
| |
| /** |
| * The constructors in those classes. |
| */ |
| pointcut myConstructor(Object obj): myClass(obj) && execution(new(..)); |
| |
| /** |
| * The methods of those classes. |
| */ |
| pointcut myMethod(Object obj): myClass(obj) && |
| execution(* *(..)) && !execution(String toString()); |
| |
| /** |
| * Before advice that will execute before a constructor |
| * is invoked. |
| */ |
| before(Object obj): myConstructor(obj) |
| { |
| traceEntry("" + thisJoinPointStaticPart.getSignature(), obj); |
| } |
| |
| /** |
| * After advice that will execute after a constructor |
| * a constructor has been invoked. |
| */ |
| after(Object obj): myConstructor(obj) |
| { |
| traceExit("" + thisJoinPointStaticPart.getSignature(), obj); |
| } |
| |
| /** |
| * Before advice that will execute before a method |
| * is invoked. |
| */ |
| before(Object obj): myMethod(obj) |
| { |
| traceEntry("" + thisJoinPointStaticPart.getSignature(), obj); |
| } |
| |
| /** |
| * After advice that will execute after a method |
| * has been invoked. |
| */ |
| after(Object obj): myMethod(obj) |
| { |
| traceExit("" + thisJoinPointStaticPart.getSignature(), obj); |
| } |
| } |