Logo Search packages:      
Sourcecode: visualvm version File versions  Download package


 * Copyright 1997-2010 Oracle and/or its affiliates. All rights reserved.
 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.
 * Other names may be trademarks of their respective owners.
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
 * License. You can obtain a copy of the License at
 * http://www.netbeans.org/cddl-gplv2.html
 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
 * specific language governing permissions and limitations under the
 * License.  When distributing the software, include this License Header
 * Notice in each file and include the License file at
 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the GPL Version 2 section of the License file that
 * accompanied this code. If applicable, add the following below the
 * License Header, with the fields enclosed by brackets [] replaced by
 * your own identifying information:
 * "Portions Copyrighted [year] [name of copyright owner]"
 * Contributor(s):
 * The Original Software is NetBeans. The Initial Developer of the Original
 * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
 * Microsystems, Inc. All Rights Reserved.
 * If you wish your version of this file to be governed by only the CDDL
 * or only the GPL Version 2, indicate your decision by adding
 * "[Contributor] elects to include this software in this distribution
 * under the [CDDL or GPL Version 2] license." If you do not indicate a
 * single choice of license, a recipient has the option to distribute
 * your version of this file under either the CDDL, the GPL Version 2 or
 * to extend the choice of license to its licensees as provided above.
 * However, if you add GPL Version 2 code and therefore, elected the GPL
 * Version 2 license, then the option applies only if the new code is
 * made subject to such option by the copyright holder.

package org.netbeans.lib.profiler.server.system;

 * Provides methods for dynamic bytecode redefinition and other class-related operations.
 * A version for CVM 
 * @author Tomas Hurka
 * @author  Misha Dmitriev
00054 public class Classes {
    //~ Inner Classes ------------------------------------------------------------------------------------------------------------

    /** We convert all error codes or exceptions thrown by redefine calls into a single error message in
     * this exception
00060     public static class RedefineException extends Exception {
        //~ Constructors ---------------------------------------------------------------------------------------------------------

        public RedefineException(String msg) {

    //~ Methods ------------------------------------------------------------------------------------------------------------------

     * Returns all currently loaded *and linked* classes.
     * On CVM, it returns just a Class[] array of all loaded classes
    public static native Class[] getAllLoadedClasses();

     * Returns the cached class file bytes for the given class. Currently
     * agent caches these bytes only for classes loaded with custom classloaders (that is, not
     * bootstrap (null) and not system classloader). If this method is called for a class loaded using bootstrap or
     * system classloader, it just returns null.
    public static native byte[] getCachedClassFileBytes(Class clazz);

    public static int getLoadedClassCount() {
        return getAllLoadedClasses().length;

    /** Object size for a given object */
    public static native long getObjectSize(Object obj);

    public static native boolean setSleepTrackingEnabled(boolean value);

    public static native boolean setVMObjectAllocEnabled(boolean value);

    public static native boolean setWaitTrackingEnabled(boolean value);

    public static native void cacheLoadedClasses(Class[] nonSystemClasses, int nonSystemIndex);

    /** Disables the above class load hook */
    public static native void disableClassLoadHook();

     * When the class load hook is enabled, it will call the ProfilerInterface.classLoadHook(Class) method every time
     * a class is load and prepared.
    public static native void enableClassLoadHook();

    /** Should be called at earliest possible time */
00109     public static void initialize() {

     * This notifies the underlying native code about the fact that some classloader (we don't know which one since
     * we use PhantomReferences for them) is unloaded. Thus the native code that could have cached the class file
     * bytes for classes loaded with this loader, may release these bytes now. Really needed only in 1.5.
    public static native void notifyAboutClassLoaderUnloading();

    /** RedefineClasses() as provided in CVM  */
00120     public static void redefineClasses(Class[] classes, byte[][] newClassFileBytes)
                                throws RedefineException {
        if (classes.length > newClassFileBytes.length) {
            throw new RedefineException("Inconsistent input data: classes.length = " + classes.length // NOI18N
                                        + ", newClassFileBytes.length = " + newClassFileBytes.length); // NOI18N

        for (int i = 0; i < classes.length; i++) {
            if (classes[i] == null) {
                throw new RedefineException("null input data: classes at " + i); // NOI18N

            if (newClassFileBytes[i] == null) {
                throw new RedefineException("null input data: newClassFileBytes at " + i); // NOI18N

        int res = doRedefineClasses(classes, newClassFileBytes);

        if (res != 0) {
            throw new RedefineException("Redefinition failed with error " + res + "\n" // NOI18N
                                        + "Check JVMTI documentation for this error code."); // NOI18N

    // ======================================== CVM specific code ===============================================
    private static native int doRedefineClasses(Class[] classes, byte[][] newClassFileBytes);

    private static RedefineException newRedefineException(String msg, Throwable origCause) {
        msg = "Class redefinition error: " + msg + "\nOriginal exception:\n" + origCause; // NOI18N

        return new RedefineException(msg);

Generated by  Doxygen 1.6.0   Back to index