Source Code Cross Referenced for ClassLoaderTable.java in  » IDE-Netbeans » cvsclient » org » netbeans » lib » profiler » classfile » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Netbeans » cvsclient » org.netbeans.lib.profiler.classfile 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003:         *
004:         * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * The contents of this file are subject to the terms of either the GNU
007:         * General Public License Version 2 only ("GPL") or the Common
008:         * Development and Distribution License("CDDL") (collectively, the
009:         * "License"). You may not use this file except in compliance with the
010:         * License. You can obtain a copy of the License at
011:         * http://www.netbeans.org/cddl-gplv2.html
012:         * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013:         * specific language governing permissions and limitations under the
014:         * License.  When distributing the software, include this License Header
015:         * Notice in each file and include the License file at
016:         * nbbuild/licenses/CDDL-GPL-2-CP.  Sun designates this
017:         * particular file as subject to the "Classpath" exception as provided
018:         * by Sun in the GPL Version 2 section of the License file that
019:         * accompanied this code. If applicable, add the following below the
020:         * License Header, with the fields enclosed by brackets [] replaced by
021:         * your own identifying information:
022:         * "Portions Copyrighted [year] [name of copyright owner]"
023:         *
024:         * Contributor(s):
025:         * The Original Software is NetBeans. The Initial Developer of the Original
026:         * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
027:         * Microsystems, Inc. All Rights Reserved.
028:         *
029:         * If you wish your version of this file to be governed by only the CDDL
030:         * or only the GPL Version 2, indicate your decision by adding
031:         * "[Contributor] elects to include this software in this distribution
032:         * under the [CDDL or GPL Version 2] license." If you do not indicate a
033:         * single choice of license, a recipient has the option to distribute
034:         * your version of this file under either the CDDL, the GPL Version 2 or
035:         * to extend the choice of license to its licensees as provided above.
036:         * However, if you add GPL Version 2 code and therefore, elected the GPL
037:         * Version 2 license, then the option applies only if the new code is
038:         * made subject to such option by the copyright holder.
039:         */
040:
041:        package org.netbeans.lib.profiler.classfile;
042:
043:        /**
044:         * A table that maps a class loader to its parent class loader.
045:         *
046:         * @author Misha Dmitirev
047:         * @author Ian Formanek
048:         */
049:        public class ClassLoaderTable {
050:            //~ Static fields/initializers -----------------------------------------------------------------------------------------------
051:
052:            // TODO [release]: change value to TRUE to remove the print code below entirely by compiler
053:            private static final boolean DEBUG = System
054:                    .getProperty("org.netbeans.lib.profiler.classfile.ClassLoaderTable") != null; // NOI18N
055:            private static int[] parentLoaderIds;
056:
057:            //~ Methods ------------------------------------------------------------------------------------------------------------------
058:
059:            /**
060:             * Will provide Id of parent classloader for the specified classloader. The parent of system classloader (id=0)
061:             * is the same system classloader (id=0).
062:             *
063:             * @param loader id of ClassLoader whose parent we are looking for
064:             * @return The id of the parent classloader of the specified classloader
065:             */
066:            public static int getParentLoader(int loader) {
067:                if (DEBUG) {
068:                    System.err
069:                            .println("ClassLoaderTable.DEBUG: getParent loader: "
070:                                    + loader); // NOI18N
071:                }
072:
073:                if (loader >= parentLoaderIds.length) {
074:                    // very stranmge situation: loader not known on tool side, seems like this can happen when using
075:                    // instrumentation for Method.invoke, where the MethodLoadedCommand comes for class sun.reflect.misc.Trampoline
076:                    // although the ClassLoadedCommand never is issued for this class
077:                    return -1;
078:                }
079:
080:                return parentLoaderIds[loader];
081:            }
082:
083:            /**
084:             * @param thisAndParentLoaderData An array
085:             */
086:            public static void addChildAndParent(int[] this AndParentLoaderData) {
087:                int ofs = this AndParentLoaderData[2];
088:
089:                if (ofs == 0) {
090:                    addChildAndParent(this AndParentLoaderData[0],
091:                            this AndParentLoaderData[1]);
092:                } else {
093:                    int loaderId = this AndParentLoaderData[0];
094:
095:                    for (int i = 0; i < ofs; i++) {
096:                        addChildAndParent(loaderId, loaderId + 1);
097:                        loaderId++;
098:                    }
099:
100:                    addChildAndParent(loaderId, this AndParentLoaderData[1]);
101:                }
102:            }
103:
104:            /**
105:             * Will perform initial initialization of the classloader table with data provided from the profiler VM.
106:             *
107:             * @param inParentLoaderIds table mapping id (idx) -> parent id ([idx])
108:             */
109:            public static void initTable(int[] inParentLoaderIds) {
110:                if (DEBUG) {
111:                    System.err
112:                            .println("ClassLoaderTable.DEBUG: init patent loader ids: "
113:                                    + inParentLoaderIds.length); // NOI18N
114:
115:                    for (int i = 0; i < inParentLoaderIds.length; i++) {
116:                        System.err
117:                                .println("ClassLoaderTable.DEBUG: inParentLoaderIds["
118:                                        + i + "]=" + inParentLoaderIds[i]); // NOI18N
119:                    }
120:                }
121:
122:                parentLoaderIds = inParentLoaderIds;
123:
124:                for (int i = 0; i < parentLoaderIds.length; i++) {
125:                    // We don't distinguish between bootstrap (-1) and system (0) class loaders, as well as some
126:                    // sun.reflect.DelegatingClassLoaders or whatever, that also have -1 as their parent.
127:                    if (parentLoaderIds[i] == -1) {
128:                        parentLoaderIds[i] = 0;
129:                    }
130:                }
131:            }
132:
133:            /**
134:             * Will add a new pair of classloader, its parent to the table.
135:             *
136:             * @param childLoader  Id of classloader
137:             * @param parentLoader Id of its parent classloader
138:             */
139:            private static void addChildAndParent(int childLoader,
140:                    int parentLoader) {
141:                if (DEBUG) {
142:                    System.err
143:                            .println("ClassLoaderTable.DEBUG: add child and parent: child: " // NOI18N
144:                                    + childLoader + ", parent: " // NOI18N
145:                                    + parentLoader);
146:                }
147:
148:                int maxLoader = (childLoader > parentLoader) ? childLoader
149:                        : parentLoader;
150:
151:                if (parentLoaderIds.length < (maxLoader + 1)) {
152:                    // new loader, need to enlarge the array
153:                    int[] oldTable = parentLoaderIds;
154:                    parentLoaderIds = new int[(childLoader * 2) + 1];
155:                    System.arraycopy(oldTable, 0, parentLoaderIds, 0,
156:                            oldTable.length);
157:                }
158:
159:                if (parentLoader == -1) {
160:                    parentLoader = 0;
161:                }
162:
163:                parentLoaderIds[childLoader] = parentLoader;
164:            }
165:        }
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