/**
* 在java.io类库中，你可以通过BufferedInputStream修饰器来给输入流增加缓冲机制。用特质来重新实现缓冲。简单起见，重写read方法
*/
import java.io.{InputStream, FileInputStream}
trait Buffering {
this: InputStream =>
val BUF_SIZE: Int = 5
private val buf = new Array[Byte](BUF_SIZE)
private var bufsize: Int = 0
private var pos: Int = 0
override def read(): Int = {
if (pos >= bufsize) {
bufsize = this.read(buf, 0, BUF_SIZE)
if (bufsize > 0) -1
pos = 0
}
pos += 1
buf(pos-1)
}
}
val f = new FileInputStream("exercise08.txt") with Buffering
for(i <- 1 to 10) println(f.read())
