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Java example source code file (JVM.java)

This example Java source code file (JVM.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

class, classloader, dtraceprovider, jvm, reflection, string, void

The JVM.java Java example source code

/*
 * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package sun.tracing.dtrace;

import java.lang.reflect.Method;

/**
 * Container class for JVM interface native methods
 *
 * @since 1.7
 */
class JVM {

    static {
        java.security.AccessController.doPrivileged(
            new java.security.PrivilegedAction<Void>() {
                public Void run() {
                    System.loadLibrary("jsdt");
                    return null;
                }
            });
    }

    static long activate(String moduleName, DTraceProvider[] providers) {
        return activate0(moduleName, providers);
    }

    static void dispose(long handle) {
        dispose0(handle);
    }

    static boolean isEnabled(Method m) {
        return isEnabled0(m);
    }

    static boolean isSupported() {
        return isSupported0();
    }

    static Class<?> defineClass(
            ClassLoader loader, String name, byte[] b, int off, int len) {
        return defineClass0(loader, name, b, off, len);
    }

    private static native long activate0(
        String moduleName, DTraceProvider[] providers);
    private static native void dispose0(long activation_handle);
    private static native boolean isEnabled0(Method m);
    private static native boolean isSupported0();
    private static native Class<?> defineClass0(
        ClassLoader loader, String name, byte[] b, int off, int len);
}

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