jdk/test/java/lang/instrument/RetransformApp.java

/*
 * Copyright 2005 Sun Microsystems, Inc.  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.
 *
 * 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */


import java.io.PrintStream;
import java.util.*;

public class RetransformApp {

    public static void main(String args[]) throws Exception {
        (new RetransformApp()).run(args, System.out);
    }

    int foo(int x) {
        return x * x;
    }

    public void run(String args[], PrintStream out) throws Exception {
        out.println("start");
        for (int i = 0; i < 4; i++) {
            if (foo(3) != 9) {
                throw new Exception("ERROR: unexpected application behavior");
            }
        }
        out.println("undo");
        RetransformAgent.undo();
        for (int i = 0; i < 4; i++) {
            if (foo(3) != 9) {
                throw new Exception("ERROR: unexpected application behavior");
            }
        }
        out.println("end");
        if (RetransformAgent.succeeded()) {
            out.println("Instrumentation succeeded.");
        } else {
            throw new Exception("ERROR: Instrumentation failed.");
        }
    }
}