/*
 * Copyright 2012-2015 org.opencloudb.
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.opencloudb;

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) {

    }

}