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package spark.util
import java.nio.ByteBuffer
import java.io.{IOException, ObjectOutputStream, EOFException, ObjectInputStream}
import java.nio.channels.Channels
/**
* A wrapper around a java.nio.ByteBuffer that is serializable through Java serialization, to make
* it easier to pass ByteBuffers in case class messages.
*/
private[spark] class SerializableBuffer(@transient var buffer: ByteBuffer) extends Serializable {
def value = buffer
private def readObject(in: ObjectInputStream) {
val length = in.readInt()
buffer = ByteBuffer.allocate(length)
var amountRead = 0
val channel = Channels.newChannel(in)
while (amountRead < length) {
val ret = channel.read(buffer)
if (ret == -1) {
throw new EOFException("End of file before fully reading buffer")
}
amountRead += ret
}
buffer.rewind() // Allow us to read it later
}
private def writeObject(out: ObjectOutputStream) {
out.writeInt(buffer.limit())
if (Channels.newChannel(out).write(buffer) != buffer.limit()) {
throw new IOException("Could not fully write buffer to output stream")
}
buffer.rewind() // Allow us to write it again later
}
}
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