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Framing.scala
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Framing.scala
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package com.reactmq
import akka.util.ByteString
import javax.annotation.concurrent.NotThreadSafe
import java.nio.ByteBuffer
import java.nio.charset.Charset
object Framing {
val SizeBytes = 4
private val utf8charset = Charset.forName("UTF-8")
def createFrame(content: String): ByteString = {
val contentBytes = content.getBytes(utf8charset)
val bb = ByteBuffer
.allocate(SizeBytes + contentBytes.length)
.putInt(contentBytes.length)
.put(contentBytes)
bb.flip()
ByteString(bb)
}
}
@NotThreadSafe
class ReconcileFrames() {
import Framing.SizeBytes
private var buffer = ByteString()
private var nextContentSize: Option[Int] = None
def apply(fragment: ByteString): List[String] = {
buffer = buffer ++ fragment
tryReadContents()
}
private def tryReadContents(): List[String] = {
nextContentSize match {
case Some(contentSize) =>
tryReadContentsWithNextSize(contentSize)
case None =>
if (buffer.size >= SizeBytes) {
val contentSize = buffer.take(SizeBytes).toByteBuffer.getInt
nextContentSize = Some(contentSize)
tryReadContentsWithNextSize(contentSize)
} else {
Nil
}
}
}
private def tryReadContentsWithNextSize(contentSize: Int): List[String] = {
if (buffer.size >= SizeBytes + contentSize) {
val content = buffer.slice(SizeBytes, SizeBytes + contentSize).utf8String
buffer = buffer.drop(SizeBytes + contentSize)
nextContentSize = None
content :: tryReadContents()
} else {
Nil
}
}
}