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package spark.network
import java.nio.ByteBuffer
import scala.collection.mutable.ArrayBuffer
import spark.storage.BlockManager
private[spark]
class BufferMessage(id_ : Int, val buffers: ArrayBuffer[ByteBuffer], var ackId: Int)
extends Message(Message.BUFFER_MESSAGE, id_) {
val initialSize = currentSize()
var gotChunkForSendingOnce = false
def size = initialSize
def currentSize() = {
if (buffers == null || buffers.isEmpty) {
0
} else {
buffers.map(_.remaining).reduceLeft(_ + _)
}
}
def getChunkForSending(maxChunkSize: Int): Option[MessageChunk] = {
if (maxChunkSize <= 0) {
throw new Exception("Max chunk size is " + maxChunkSize)
}
if (size == 0 && gotChunkForSendingOnce == false) {
val newChunk = new MessageChunk(
new MessageChunkHeader(typ, id, 0, 0, ackId, senderAddress), null)
gotChunkForSendingOnce = true
return Some(newChunk)
}
while(!buffers.isEmpty) {
val buffer = buffers(0)
if (buffer.remaining == 0) {
BlockManager.dispose(buffer)
buffers -= buffer
} else {
val newBuffer = if (buffer.remaining <= maxChunkSize) {
buffer.duplicate()
} else {
buffer.slice().limit(maxChunkSize).asInstanceOf[ByteBuffer]
}
buffer.position(buffer.position + newBuffer.remaining)
val newChunk = new MessageChunk(new MessageChunkHeader(
typ, id, size, newBuffer.remaining, ackId, senderAddress), newBuffer)
gotChunkForSendingOnce = true
return Some(newChunk)
}
}
None
}
def getChunkForReceiving(chunkSize: Int): Option[MessageChunk] = {
// STRONG ASSUMPTION: BufferMessage created when receiving data has ONLY ONE data buffer
if (buffers.size > 1) {
throw new Exception("Attempting to get chunk from message with multiple data buffers")
}
val buffer = buffers(0)
if (buffer.remaining > 0) {
if (buffer.remaining < chunkSize) {
throw new Exception("Not enough space in data buffer for receiving chunk")
}
val newBuffer = buffer.slice().limit(chunkSize).asInstanceOf[ByteBuffer]
buffer.position(buffer.position + newBuffer.remaining)
val newChunk = new MessageChunk(new MessageChunkHeader(
typ, id, size, newBuffer.remaining, ackId, senderAddress), newBuffer)
return Some(newChunk)
}
None
}
def flip() {
buffers.foreach(_.flip)
}
def hasAckId() = (ackId != 0)
def isCompletelyReceived() = !buffers(0).hasRemaining
override def toString = {
if (hasAckId) {
"BufferAckMessage(aid = " + ackId + ", id = " + id + ", size = " + size + ")"
} else {
"BufferMessage(id = " + id + ", size = " + size + ")"
}
}
}
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