test/java/lang/instrument/FromShutdownHook.java

/*
 * Copyright (c) 2004, 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.
 *
 * 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.
 */

/*
 * @test
 * @bug 5050487
 * @summary Check that Instrumentation methods can execute from a runtime
 *          shutdown hook
 * @run build FromShutdownHook
 * @run shell MakeJAR.sh basicAgent
 * @run main/othervm -javaagent:basicAgent.jar FromShutdownHook FromShutdownHook
 */
import java.lang.instrument.Instrumentation;

public class FromShutdownHook
    extends ASimpleInstrumentationTestCase
{
    public FromShutdownHook(String name) {
        super(name);
    }
    public static void main(String args[] ) throws Throwable {
        FromShutdownHook fsh = new FromShutdownHook(args[0]);
        fsh.runTest();
    }

    Instrumentation ins;

    protected final void doRunTest() {
        // keep reference to Instrumentation
        ins = fInst;

        // install shutdown hook
        Runtime.getRuntime().addShutdownHook(new Thread() {
            public void run() {
                System.err.println(ins.getAllLoadedClasses().length +
                        " classes loaded.");
            }
        });
    }
}