/*
    * Copyright (c) 1999, 2008, 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 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();
             }
         }
     }
 }