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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package spark.streaming.receivers
import akka.actor.Actor
import akka.zeromq._
import spark.Logging
/**
* A receiver to subscribe to ZeroMQ stream.
*/
private[streaming] class ZeroMQReceiver[T: ClassManifest](publisherUrl: String,
subscribe: Subscribe,
bytesToObjects: Seq[Seq[Byte]] ⇒ Iterator[T])
extends Actor with Receiver with Logging {
override def preStart() = context.system.newSocket(SocketType.Sub, Listener(self),
Connect(publisherUrl), subscribe)
def receive: Receive = {
case Connecting ⇒ logInfo("connecting ...")
case m: ZMQMessage ⇒
logDebug("Received message for:" + m.firstFrameAsString)
//We ignore first frame for processing as it is the topic
val bytes = m.frames.tail.map(_.payload)
pushBlock(bytesToObjects(bytes))
case Closed ⇒ logInfo("received closed ")
}
}
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