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package spark.network.netty
import io.netty.buffer._
import spark.Logging
private[spark] class FileHeader (
val fileLen: Int,
val blockId: String) extends Logging {
lazy val buffer = {
val buf = Unpooled.buffer()
buf.capacity(FileHeader.HEADER_SIZE)
buf.writeInt(fileLen)
buf.writeInt(blockId.length)
blockId.foreach((x: Char) => buf.writeByte(x))
//padding the rest of header
if (FileHeader.HEADER_SIZE - buf.readableBytes > 0 ) {
buf.writeZero(FileHeader.HEADER_SIZE - buf.readableBytes)
} else {
throw new Exception("too long header " + buf.readableBytes)
logInfo("too long header")
}
buf
}
}
private[spark] object FileHeader {
val HEADER_SIZE = 40
def getFileLenOffset = 0
def getFileLenSize = Integer.SIZE/8
def create(buf: ByteBuf): FileHeader = {
val length = buf.readInt
val idLength = buf.readInt
val idBuilder = new StringBuilder(idLength)
for (i <- 1 to idLength) {
idBuilder += buf.readByte().asInstanceOf[Char]
}
val blockId = idBuilder.toString()
new FileHeader(length, blockId)
}
def main (args:Array[String]){
val header = new FileHeader(25,"block_0");
val buf = header.buffer;
val newheader = FileHeader.create(buf);
System.out.println("id="+newheader.blockId+",size="+newheader.fileLen)
}
}
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