content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * based on code by MyCATCopyrightHolder Copyright (c) 2013, OpenCloudDB/MyCAT.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  package com.actiontech.dble;
  
  import java.nio.ByteBuffer;
  
  /**
   * @author mycat
   */
  public class BufferPerformanceMain {
  
      public void getAllocate() {
          ByteBuffer buffer = ByteBuffer.allocate(4096);
          byte[] b = new byte[1024];
  
          int count = 1000000;
          System.currentTimeMillis();
  
          long t1 = System.currentTimeMillis();
          for (int i = 0; i < count; i++) {
              buffer.position(0);
              buffer.get(b);
          }
          long t2 = System.currentTimeMillis();
          System.out.println("take time:" + (t2 - t1) + " ms.(Get:allocate)");
      }
  
      public void getAllocateDirect() {
          ByteBuffer buffer = ByteBuffer.allocateDirect(4096);
          byte[] b = new byte[1024];
  
          int count = 1000000;
          System.currentTimeMillis();
  
          long t1 = System.currentTimeMillis();
          for (int i = 0; i < count; i++) {
              buffer.position(0);
              buffer.get(b);
          }
          long t2 = System.currentTimeMillis();
          System.out.println("take time:" + (t2 - t1) + " ms.(Get:allocateDirect)");
      }
  
      public void putAllocate() {
          ByteBuffer buffer = ByteBuffer.allocate(4096);
          byte[] b = new byte[1024];
  
          int count = 1000000;
          System.currentTimeMillis();
  
          long t1 = System.currentTimeMillis();
          for (int i = 0; i < count; i++) {
              buffer.position(0);
              buffer.put(b);
          }
          long t2 = System.currentTimeMillis();
          System.out.println("take time:" + (t2 - t1) + " ms.(Put:allocate)");
      }
  
      public void putAllocateDirect() {
          ByteBuffer buffer = ByteBuffer.allocateDirect(4096);
          byte[] b = new byte[1024];
  
          int count = 1000000;
          System.currentTimeMillis();
  
          long t1 = System.currentTimeMillis();
          for (int i = 0; i < count; i++) {
              buffer.position(0);
              buffer.put(b);
          }
          long t2 = System.currentTimeMillis();
          System.out.println("take time:" + (t2 - t1) + " ms.(Put:allocateDirect)");
      }
  
      public void copyArrayDirect() {
          ByteBuffer buffer = ByteBuffer.allocateDirect(4096);
          while (buffer.hasRemaining()) {
              buffer.put((byte) 1);
          }
          byte[] b = new byte[1024];
          int count = 10000000;
          System.currentTimeMillis();
  
          long t1 = System.currentTimeMillis();
          for (int i = 0; i < count; i++) {
              buffer.position(0);
              buffer.get(b, 0, b.length);
          }
          long t2 = System.currentTimeMillis();
          System.out.println("take time:" + (t2 - t1) + " ms.(testCopyArrayDirect)");
      }
  
      public void copyArray() {
          ByteBuffer buffer = ByteBuffer.allocate(4096);
          while (buffer.hasRemaining()) {
              buffer.put((byte) 1);
          }
          byte[] b = new byte[1024];
          int count = 10000000;
          System.currentTimeMillis();
  
          long t1 = System.currentTimeMillis();
          for (int i = 0; i < count; i++) {
              buffer.position(0);
              buffer.get(b, 0, b.length);
          }
          long t2 = System.currentTimeMillis();
          System.out.println("take time:" + (t2 - t1) + " ms.(testCopyArray)");
      }
  
      public static void main(String[] args) {
  
      }
  
  }