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/*
 * Copyright (c) 2011.  Peter Lawrey
 *
 * "THE BEER-WARE LICENSE" (Revision 128)
 * As long as you retain this notice you can do whatever you want with this stuff.
 * If we meet some day, and you think this stuff is worth it, you can buy me a beer in return
 * There is no warranty.
 */

package com.google.code.java.core.parser;

import org.junit.Test;

import java.io.*;
import java.nio.ByteBuffer;
import java.util.Arrays;

import static junit.framework.Assert.assertEquals;

public class InMemoryPerfTest {
  interface PerfTest {
    LongReader longReader();

    LongWriter longWriter();

    void finish();

    String toString();
  }

  public void doPerf(PerfTest perfTest) throws IOException, InterruptedException {
    int runs = 1001;
    long[] times = new long[runs];
    long len = 128 * 1024;
    for (int n = 0; n < runs; n++) {
      Thread.sleep(1);
      long start = System.nanoTime();

      LongWriter lw = perfTest.longWriter();
      lw.write(len);
      for (long i = 0; i < len; i++) {
        lw.write(i);
      }
      lw.close();

      LongReader lr = perfTest.longReader();
      long len2 = lr.read();
      if (len != len2)
        assertEquals(len, len2);

      for (long i = 0; i < len; i++) {
        lr.read();
      }
      lr.close();
      times[n] = System.nanoTime() - start;
    }
    perfTest.finish();
    Arrays.sort(times);
    System.out.printf(perfTest + ": Typically took %.1f ns to write/read per long.%n", (double) times[runs / 2] / len);
  }

  @Test
  public void testUnsafePerf() throws IOException, InterruptedException {
    doPerf(new PerfTest() {
      final long address = ParserUtils.UNSAFE.allocateMemory(1024 * 1024);

      @Override
      public LongWriter longWriter() {
        return new UnsafeLongWriter(address);
      }

      @Override
      public LongReader longReader() {
        return new UnsafeLongReader(address);
      }

      @Override
      public String toString() {
        return "Unsafe binary";
      }

      @Override
      public void finish() {
        ParserUtils.UNSAFE.freeMemory(address);
      }
    });
  }

  @Test
  public void testByteBufferPerf() throws IOException, InterruptedException {
    doPerf(new PerfTest() {
      ByteBuffer buffer = ByteBuffer.allocateDirect(1025 * 1024);

      @Override
      public LongWriter longWriter() {
        buffer.clear();
        return new ByteBufferLongWriter(buffer);
      }

      @Override
      public LongReader longReader() {
        buffer.flip();
        return new ByteBufferLongReader(buffer);
      }

      @Override
      public String toString() {
        return "ByteBuffer binary";
      }

      @Override
      public void finish() {
      }
    });
  }

  @Test
  public void testByteBufferTextDirectPerf() throws IOException, InterruptedException {
    doPerf(new PerfTest() {
      ByteBuffer buffer = ByteBuffer.allocateDirect(1025 * 1024);

      @Override
      public LongWriter longWriter() {
        buffer.clear();
        return new ByteBufferTextLongWriter(buffer);
      }

      @Override
      public LongReader longReader() {
        buffer.flip();
        return new ByteBufferTextLongReader(buffer);
      }

      @Override
      public String toString() {
        return "ByteBuffer direct text";
      }

      @Override
      public void finish() {
      }
    });
  }

  @Test
  public void testByteBufferTextPerf() throws IOException, InterruptedException {
    doPerf(new PerfTest() {
      ByteBuffer buffer = ByteBuffer.allocate(1025 * 1024);

      @Override
      public LongWriter longWriter() {
        buffer.clear();
        return new ByteBufferTextLongWriter(buffer);
      }

      @Override
      public LongReader longReader() {
        buffer.flip();
        return new ByteBufferTextLongReader(buffer);
      }

      @Override
      public String toString() {
        return "ByteBuffer heap text";
      }

      @Override
      public void finish() {
      }
    });
  }

  @Test
  public void testUnsafeTextPerf() throws IOException, InterruptedException {
    doPerf(new PerfTest() {
      final long address = ParserUtils.UNSAFE.allocateMemory(1025 * 1024);

      @Override
      public LongWriter longWriter() {
        return new UnsafeTextLongWriter(address);
      }

      @Override
      public LongReader longReader() {
        return new UnsafeTextLongReader(address);
      }

      @Override
      public String toString() {
        return "Unsafe text";
      }

      @Override
      public void finish() {
        ParserUtils.UNSAFE.freeMemory(address);
      }
    });
  }

  @Test
  public void testDataPerf() throws IOException, InterruptedException {
    doPerf(new PerfTest() {
      ByteArrayOutputStream baos;

      @Override
      public LongWriter longWriter() {
        baos = new ByteArrayOutputStream();
        return new DataLongWriter(baos);
      }

      @Override
      public LongReader longReader() {
        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        return new DataLongReader(bais);
      }

      @Override
      public String toString() {
        return "DataStream binary";
      }

      @Override
      public void finish() {
      }
    });
  }

  @Test
  public void testPrintPerf() throws IOException, InterruptedException {
    doPerf(new PerfTest() {
      ByteArrayOutputStream baos;

      @Override
      public LongWriter longWriter() {
        baos = new ByteArrayOutputStream();
        return new PrintLongWriter(new PrintWriter(new OutputStreamWriter(baos)));
      }

      @Override
      public LongReader longReader() {
        return new PrintLongReader(
                                      new BufferedReader(
                                                            new InputStreamReader(
                                                                                     new ByteArrayInputStream(baos.toByteArray()))));
      }

      @Override
      public String toString() {
        return "Print text";
      }

      @Override
      public void finish() {
      }
    });
  }

  @Test
  public void testDecimalFormatPerf() throws IOException, InterruptedException {
    doPerf(new PerfTest() {
      ByteArrayOutputStream baos;

      @Override
      public LongWriter longWriter() {
        baos = new ByteArrayOutputStream();
        return new DecimalFormatLongWriter(new PrintWriter(new OutputStreamWriter(baos)));
      }

      @Override
      public LongReader longReader() {
        return new DecimalFormatLongReader(
                                              new BufferedReader(
                                                                    new InputStreamReader(
                                                                                             new ByteArrayInputStream(baos.toByteArray()))));
      }

      @Override
      public String toString() {
        return "DecimalFormat text";
      }

      @Override
      public void finish() {
      }
    });
  }
}