package buffertest;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import static java.lang.System.nanoTime;
import static java.lang.System.out;

public class BufferTest {
    
    private static final String
            PATH     = "C:\\Documents and Settings\\User\\Рабочий стол\\",
//            FILE_IN  = PATH +  "in.txt",
//            FILE_IN  = "D:\\Музыка\\J26 - Fallen.mp3",
            FILE_IN  = "F:\\CON4513_mp4_4513_001.mp4",
            FILE_OUT = PATH + "out.mp3";

    private static final long MB = 1024 * 1024;

    public static void main(String[] a) throws IOException {
        File file = new File(FILE_IN);
        out.println(("FILE_IN: " + FILE_IN + "\nsize : ") + file.length() / MB + " Mb");

//        handMadeBuffer();
//        standartlibraryBuffer();

        for (int i = 0; ++i < 20; handMadeBuffer()) {}
        out.println();
        for (int i = 0; ++i < 20; standartlibraryBuffer()) {}
    }

    private static void handMadeBuffer() throws IOException {
        long time = nanoTime();

        try (
                InputStream  is = new FileInputStream(FILE_IN);
                OutputStream os = new FileOutputStream(FILE_OUT)
            )
        {
//            byte[] buffer = new byte[4 * 1024];
            byte[] buffer = new byte[8 * 1024];
            for (int readed; (readed = is.read(buffer)) > -1;) {
                os.write(buffer, 0, readed);
            }
        }

        time = nanoTime() - time;
        out.printf("handMadeBuffer        :%8.3f sec\n", time / 1e9);
    }

    private static void standartlibraryBuffer() throws IOException {
        long time = nanoTime();

        try (
                InputStream  is = new BufferedInputStream(new FileInputStream(FILE_IN));
                OutputStream os = new BufferedOutputStream(new FileOutputStream(FILE_OUT))
            )
        {
            for (int readed; (readed = is.read()) > -1;) {
                os.write(readed);
            }
        }

        time = nanoTime() - time;
        out.printf("standartlibraryBuffer :%8.3f sec\n", time / 1e9);
    }
}

handMadeBuffer        :   0,031 sec
handMadeBuffer        :   0,034 sec
handMadeBuffer        :   0,034 sec
handMadeBuffer        :   0,031 sec
handMadeBuffer        :   0,031 sec
handMadeBuffer        :   0,030 sec
handMadeBuffer        :   0,030 sec
handMadeBuffer        :   0,029 sec
handMadeBuffer        :   0,028 sec
handMadeBuffer        :   0,027 sec
handMadeBuffer        :   0,026 sec
handMadeBuffer        :   0,025 sec
handMadeBuffer        :   0,025 sec
handMadeBuffer        :   0,026 sec
handMadeBuffer        :   0,023 sec
handMadeBuffer        :   0,023 sec
handMadeBuffer        :   0,025 sec
handMadeBuffer        :   0,024 sec
handMadeBuffer        :   0,023 sec

standartlibraryBuffer :   0,531 sec
standartlibraryBuffer :   0,520 sec
standartlibraryBuffer :   0,472 sec
standartlibraryBuffer :   0,485 sec
standartlibraryBuffer :   0,472 sec
standartlibraryBuffer :   0,484 sec
standartlibraryBuffer :   0,477 sec
standartlibraryBuffer :   0,482 sec
standartlibraryBuffer :   0,195 sec
standartlibraryBuffer :   0,198 sec
standartlibraryBuffer :   0,205 sec
standartlibraryBuffer :   0,197 sec
standartlibraryBuffer :   0,199 sec
standartlibraryBuffer :   0,212 sec
standartlibraryBuffer :   0,198 sec
standartlibraryBuffer :   0,197 sec
standartlibraryBuffer :   0,200 sec
standartlibraryBuffer :   0,201 sec
standartlibraryBuffer :   0,208 sec

handMadeBuffer        :  37,425 sec
handMadeBuffer        :  35,660 sec
handMadeBuffer        :  37,993 sec
handMadeBuffer        :  35,417 sec
handMadeBuffer        :  42,817 sec
handMadeBuffer        :  39,307 sec
handMadeBuffer        :  40,384 sec
handMadeBuffer        :  40,191 sec
handMadeBuffer        :  42,184 sec
handMadeBuffer        :  42,272 sec
handMadeBuffer        :  44,310 sec
handMadeBuffer        :  46,982 sec
handMadeBuffer        :  41,124 sec
handMadeBuffer        :  42,509 sec
handMadeBuffer        :  43,647 sec
handMadeBuffer        :  44,751 sec
handMadeBuffer        :  53,871 sec
handMadeBuffer        :  39,096 sec
handMadeBuffer        :  44,394 sec

standartlibraryBuffer :   8,793 sec
standartlibraryBuffer :   8,664 sec
standartlibraryBuffer :  47,413 sec
standartlibraryBuffer :   8,979 sec
standartlibraryBuffer :  33,645 sec
standartlibraryBuffer :   8,139 sec
standartlibraryBuffer :  34,492 sec
standartlibraryBuffer :   7,243 sec
standartlibraryBuffer :   7,434 sec
standartlibraryBuffer :  34,293 sec
standartlibraryBuffer :   8,681 sec
standartlibraryBuffer :  40,505 sec
standartlibraryBuffer :   9,130 sec
standartlibraryBuffer :  36,645 sec
standartlibraryBuffer :   8,807 sec
standartlibraryBuffer :  36,239 sec
standartlibraryBuffer :   8,630 sec
standartlibraryBuffer :  42,663 sec
standartlibraryBuffer :   8,305 sec