Github user pwendell commented on a diff in the pull request:
https://github.com/apache/spark/pull/300#discussion_r11721384
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/receiver/NetworkReceiverExecutor.scala
---
@@ -0,0 +1,190 @@
+/*
+ * 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 org.apache.spark.streaming.receiver
+
+import java.nio.ByteBuffer
+
+import scala.collection.mutable.ArrayBuffer
+
+import org.apache.spark.{Logging, SparkConf}
+import org.apache.spark.storage.StreamBlockId
+import java.util.concurrent.CountDownLatch
+import scala.concurrent._
+import ExecutionContext.Implicits.global
+
+/**
+ * Abstract class that is responsible for executing a NetworkReceiver in
the worker.
+ * It provides all the necessary interfaces for handling the data received
by the receiver.
+ */
+private[streaming] abstract class NetworkReceiverExecutor(
+ receiver: NetworkReceiver[_],
+ conf: SparkConf
+ ) extends Logging {
+
+
+ /** Enumeration to identify current state of the StreamingContext */
+ object NetworkReceiverState extends Enumeration {
+ type CheckpointState = Value
+ val Initialized, Started, Stopped = Value
+ }
+ import NetworkReceiverState._
+
+ // Attach the executor to the receiver
+ receiver.attachExecutor(this)
+
+ /** Receiver id */
+ protected val receiverId = receiver.receiverId
+
+ /** Message associated with the stopping of the receiver */
+ protected var stopMessage = ""
+
+ /** Exception associated with the stopping of the receiver */
+ protected var stopException: Throwable = null
+
+ /** Has the receiver been marked for stop. */
+ private val stopLatch = new CountDownLatch(1)
+
+ /** Time between a receiver is stopped */
+ private val restartDelay =
conf.getInt("spark.streaming.receiverRestartDelay", 2000)
+
+ /** State of the receiver */
+ private[streaming] var receiverState = Initialized
+
+ /** Push a single data item to backend data store. */
+ def pushSingle(data: Any)
+
+ /** Push a byte buffer to backend data store. */
+ def pushBytes(
+ bytes: ByteBuffer,
+ optionalMetadata: Option[Any],
+ optionalBlockId: Option[StreamBlockId]
+ )
+
+ /** Push an iterator of objects as a block to backend data store. */
+ def pushIterator(
+ iterator: Iterator[_],
+ optionalMetadata: Option[Any],
+ optionalBlockId: Option[StreamBlockId]
+ )
+
+ /** Push an ArrayBuffer of object as a block to back data store. */
--- End diff --
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