jdk/test/java/lang/instrument/RedefineSubclassWithTwoInterfacesApp.java

/*
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 * 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.
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import java.io.*;
import java.lang.instrument.*;

public class RedefineSubclassWithTwoInterfacesApp {
    public static void main(String args[]) throws Exception {
        System.out.println("Hello from RedefineSubclassWithTwoInterfacesApp!");

        new RedefineSubclassWithTwoInterfacesApp().doTest();

        System.exit(0);
    }

    private void doTest() throws Exception {
        RedefineSubclassWithTwoInterfacesImpl impl
            = new RedefineSubclassWithTwoInterfacesImpl();
        RedefineSubclassWithTwoInterfacesRemote remote
            = new RedefineSubclassWithTwoInterfacesRemote(impl, impl);
        String mesg;

        // make echo() calls before any redefinitions:
        mesg = remote.echo1("test message #1.1");
        System.out.println("RedefineSubclassWithTwoInterfacesApp: echo1 mesg='"
            + mesg + "' before any redefines");
        mesg = remote.echo2("test message #2.1");
        System.out.println("RedefineSubclassWithTwoInterfacesApp: echo2 mesg='"
            + mesg + "' before any redefines");


        // redefining RedefineSubclassWithTwoInterfacesImpl before
        // RedefineSubclassWithTwoInterfacesTarget fails:
        do_redefine("RedefineSubclassWithTwoInterfacesImpl", 1);
        do_redefine("RedefineSubclassWithTwoInterfacesTarget", 1);

        mesg = remote.echo1("test message #1.2");
        System.out.println("RedefineSubclassWithTwoInterfacesApp: echo1 mesg='"
            + mesg + "' after redefine");
        mesg = remote.echo2("test message #2.2");
        System.out.println("RedefineSubclassWithTwoInterfacesApp: echo2 mesg='"
            + mesg + "' after redefine");
    }

    private static void do_redefine(String className, int counter)
            throws Exception {
        File f = new File(className + "_" + counter + ".class");
        System.out.println("Reading test class from " + f);
        InputStream redefineStream = new FileInputStream(f);

        byte[] redefineBuffer
            = NamedBuffer.loadBufferFromStream(redefineStream);

        ClassDefinition redefineParamBlock = new ClassDefinition(
            Class.forName(className), redefineBuffer);

        RedefineSubclassWithTwoInterfacesAgent.getInstrumentation().
            redefineClasses(new ClassDefinition[] {redefineParamBlock});
    }
}