/*

 * 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.

 */

/*

 *

 */

package bench.serial;

import bench.Benchmark;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.Serializable;

import java.lang.reflect.Constructor;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

/**

 * Benchmark for testing speed of proxy array reads/writes.

 */

public class ProxyArrays implements Benchmark {

    static class DummyHandler implements InvocationHandler, Serializable {

        public Object invoke(Object proxy, Method method, Object[] args)

            throws Throwable

        {

            return null;

        }

    }

    static interface DummyInterface {

        public void foo();

    }

    /**

     * Write and read proxy arrays to/from a stream.  The benchmark is run in

     * batches, with each batch consisting of a fixed number of read/write

     * cycles.  The ObjectOutputStream is reset after each batch of cycles has

     * completed.

     * Arguments: <array size> <# batches> <# cycles per batch>

     */

    public long run(String[] args) throws Exception {

        int size = Integer.parseInt(args[0]);

        int nbatches = Integer.parseInt(args[1]);

        int ncycles = Integer.parseInt(args[2]);

        Proxy[][] arrays = genArrays(size, ncycles);

        StreamBuffer sbuf = new StreamBuffer();

        ObjectOutputStream oout =

            new ObjectOutputStream(sbuf.getOutputStream());

        ObjectInputStream oin =

            new ObjectInputStream(sbuf.getInputStream());

        doReps(oout, oin, sbuf, arrays, 1);     // warmup

        long start = System.currentTimeMillis();

        doReps(oout, oin, sbuf, arrays, nbatches);

        return System.currentTimeMillis() - start;

    }

    /**

     * Generate proxy arrays.

     */

    Proxy[][] genArrays(int size, int narrays) throws Exception {

        Class proxyClass =

            Proxy.getProxyClass(DummyInterface.class.getClassLoader(),

                    new Class[] { DummyInterface.class });

        Constructor proxyCons =

            proxyClass.getConstructor(new Class[] { InvocationHandler.class });

        Object[] consArgs = new Object[] { new DummyHandler() };

        Proxy[][] arrays = new Proxy[narrays][size];

        for (int i = 0; i < narrays; i++) {

            for (int j = 0; j < size; j++) {

                arrays[i][j] = (Proxy) proxyCons.newInstance(consArgs);

            }

        }

        return arrays;

    }

    /**

     * Run benchmark for given number of batches, with given number of cycles

     * for each batch.

     */

    void doReps(ObjectOutputStream oout, ObjectInputStream oin,

                StreamBuffer sbuf, Proxy[][] arrays, int nbatches)

        throws Exception

    {

        int ncycles = arrays.length;

        for (int i = 0; i < nbatches; i++) {

            sbuf.reset();

            oout.reset();

            for (int j = 0; j < ncycles; j++) {

                oout.writeObject(arrays[j]);

            }

            oout.flush();

            for (int j = 0; j < ncycles; j++) {

                oin.readObject();

            }

        }

    }

}