dcevm/dcevm/src/main/java/org/dcevm/InstrumentationRedefiner.java

/*
 * Copyright (c) 2010, 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.
 *
 */
package org.dcevm;


import org.dcevm.agent.InstrumentationAgent;

import java.io.IOException;
import java.lang.instrument.ClassDefinition;
import java.lang.instrument.Instrumentation;
import java.lang.instrument.UnmodifiableClassException;
import java.util.Map;

public class InstrumentationRedefiner implements Redefiner {
    public void redefineClasses(Map<Class<?>, byte[]> classes) throws ClassNotFoundException, UnmodifiableClassException {
        Instrumentation instrumentation = InstrumentationAgent.INSTRUMENTATION;
        if (instrumentation == null) {
            throw new IllegalStateException("Instrumentation agent is not properly installed!");
        }

        ClassDefinition[] definitions = new ClassDefinition[classes.size()];
        int i = 0;
        for (Map.Entry<Class<?>, byte[]> entry : classes.entrySet()) {
            definitions[i++] = new ClassDefinition(entry.getKey(), entry.getValue());
        }
        instrumentation.redefineClasses(definitions);
    }

    @Override
    public void close() throws IOException {
        // Do nothing.
    }
}