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package spark
import java.io._
import java.nio.ByteBuffer
import serializer.{Serializer, SerializerInstance, DeserializationStream, SerializationStream}
import spark.util.ByteBufferInputStream
private[spark] class JavaSerializationStream(out: OutputStream) extends SerializationStream {
val objOut = new ObjectOutputStream(out)
def writeObject[T](t: T): SerializationStream = { objOut.writeObject(t); this }
def flush() { objOut.flush() }
def close() { objOut.close() }
}
private[spark] class JavaDeserializationStream(in: InputStream, loader: ClassLoader)
extends DeserializationStream {
val objIn = new ObjectInputStream(in) {
override def resolveClass(desc: ObjectStreamClass) =
Class.forName(desc.getName, false, loader)
}
def readObject[T](): T = objIn.readObject().asInstanceOf[T]
def close() { objIn.close() }
}
private[spark] class JavaSerializerInstance extends SerializerInstance {
def serialize[T](t: T): ByteBuffer = {
val bos = new ByteArrayOutputStream()
val out = serializeStream(bos)
out.writeObject(t)
out.close()
ByteBuffer.wrap(bos.toByteArray)
}
def deserialize[T](bytes: ByteBuffer): T = {
val bis = new ByteBufferInputStream(bytes)
val in = deserializeStream(bis)
in.readObject().asInstanceOf[T]
}
def deserialize[T](bytes: ByteBuffer, loader: ClassLoader): T = {
val bis = new ByteBufferInputStream(bytes)
val in = deserializeStream(bis, loader)
in.readObject().asInstanceOf[T]
}
def serializeStream(s: OutputStream): SerializationStream = {
new JavaSerializationStream(s)
}
def deserializeStream(s: InputStream): DeserializationStream = {
new JavaDeserializationStream(s, Thread.currentThread.getContextClassLoader)
}
def deserializeStream(s: InputStream, loader: ClassLoader): DeserializationStream = {
new JavaDeserializationStream(s, loader)
}
}
/**
* A Spark serializer that uses Java's built-in serialization.
*/
class JavaSerializer extends Serializer {
def newInstance(): SerializerInstance = new JavaSerializerInstance
}
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