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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 org.apache.spark.streaming
import java.nio.ByteBuffer
import scala.collection.mutable.ArrayBuffer
import scala.language.postfixOps
import org.apache.spark.SparkConf
import org.apache.spark.storage.{StorageLevel, StreamBlockId}
import org.apache.spark.streaming.receiver.{BlockGenerator, BlockGeneratorListener, Receiver, ReceiverSupervisor}
import org.scalatest.FunSuite
import org.scalatest.concurrent.Timeouts
import org.scalatest.concurrent.Eventually._
import org.scalatest.time.SpanSugar._
import scala.language.postfixOps
/** Testsuite for testing the network receiver behavior */
class NetworkReceiverSuite extends FunSuite with Timeouts {
test("network receiver life cycle") {
val receiver = new FakeReceiver
val executor = new FakeReceiverSupervisor(receiver)
assert(executor.isAllEmpty)
// Thread that runs the executor
val executingThread = new Thread() {
override def run() {
executor.start()
executor.awaitTermination()
}
}
// Start the receiver
executingThread.start()
// Verify that the receiver
intercept[Exception] {
failAfter(200 millis) {
executingThread.join()
}
}
// Verify that receiver was started
assert(receiver.onStartCalled)
assert(executor.isReceiverStarted)
assert(receiver.isStarted)
assert(!receiver.isStopped())
assert(receiver.otherThread.isAlive)
eventually(timeout(100 millis), interval(10 millis)) {
assert(receiver.receiving)
}
// Verify whether the data stored by the receiver was sent to the executor
val byteBuffer = ByteBuffer.allocate(100)
val arrayBuffer = new ArrayBuffer[Int]()
val iterator = arrayBuffer.iterator
receiver.store(1)
receiver.store(byteBuffer)
receiver.store(arrayBuffer)
receiver.store(iterator)
assert(executor.singles.size === 1)
assert(executor.singles.head === 1)
assert(executor.byteBuffers.size === 1)
assert(executor.byteBuffers.head.eq(byteBuffer))
assert(executor.iterators.size === 1)
assert(executor.iterators.head.eq(iterator))
assert(executor.arrayBuffers.size === 1)
assert(executor.arrayBuffers.head.eq(arrayBuffer))
// Verify whether the exceptions reported by the receiver was sent to the executor
val exception = new Exception
receiver.reportError("Error", exception)
assert(executor.errors.size === 1)
assert(executor.errors.head.eq(exception))
// Verify restarting actually stops and starts the receiver
receiver.restart("restarting", null, 100)
assert(receiver.isStopped)
assert(receiver.onStopCalled)
eventually(timeout(1000 millis), interval(100 millis)) {
assert(receiver.onStartCalled)
assert(executor.isReceiverStarted)
assert(receiver.isStarted)
assert(!receiver.isStopped)
assert(receiver.receiving)
}
// Verify that stopping actually stops the thread
failAfter(100 millis) {
receiver.stop("test")
assert(receiver.isStopped)
assert(!receiver.otherThread.isAlive)
// The thread that started the executor should complete
// as stop() stops everything
executingThread.join()
}
}
test("block generator") {
val blockGeneratorListener = new FakeBlockGeneratorListener
val blockInterval = 200
val conf = new SparkConf().set("spark.streaming.blockInterval", blockInterval.toString)
val blockGenerator = new BlockGenerator(blockGeneratorListener, 1, conf)
val expectedBlocks = 5
val waitTime = expectedBlocks * blockInterval + (blockInterval / 2)
val generatedData = new ArrayBuffer[Int]
// Generate blocks
val startTime = System.currentTimeMillis()
blockGenerator.start()
var count = 0
while(System.currentTimeMillis - startTime < waitTime) {
blockGenerator += count
generatedData += count
count += 1
Thread.sleep(10)
}
blockGenerator.stop()
val recordedData = blockGeneratorListener.arrayBuffers.flatten
assert(blockGeneratorListener.arrayBuffers.size > 0)
assert(recordedData.toSet === generatedData.toSet)
}
/**
* An implementation of NetworkReceiver that is used for testing a receiver's life cycle.
*/
class FakeReceiver extends Receiver[Int](StorageLevel.MEMORY_ONLY) {
var otherThread: Thread = null
var receiving = false
var onStartCalled = false
var onStopCalled = false
def onStart() {
otherThread = new Thread() {
override def run() {
receiving = true
while(!isStopped()) {
Thread.sleep(10)
}
}
}
onStartCalled = true
otherThread.start()
}
def onStop() {
onStopCalled = true
otherThread.join()
}
def reset() {
receiving = false
onStartCalled = false
onStopCalled = false
}
}
/**
* An implementation of NetworkReceiverExecutor used for testing a NetworkReceiver.
* Instead of storing the data in the BlockManager, it stores all the data in a local buffer
* that can used for verifying that the data has been forwarded correctly.
*/
class FakeReceiverSupervisor(receiver: FakeReceiver)
extends ReceiverSupervisor(receiver, new SparkConf()) {
val singles = new ArrayBuffer[Any]
val byteBuffers = new ArrayBuffer[ByteBuffer]
val iterators = new ArrayBuffer[Iterator[_]]
val arrayBuffers = new ArrayBuffer[ArrayBuffer[_]]
val errors = new ArrayBuffer[Throwable]
/** Check if all data structures are clean */
def isAllEmpty = {
singles.isEmpty && byteBuffers.isEmpty && iterators.isEmpty &&
arrayBuffers.isEmpty && errors.isEmpty
}
def pushSingle(data: Any) {
singles += data
}
def pushBytes(
bytes: ByteBuffer,
optionalMetadata: Option[Any],
optionalBlockId: Option[StreamBlockId]
) {
byteBuffers += bytes
}
def pushIterator(
iterator: Iterator[_],
optionalMetadata: Option[Any],
optionalBlockId: Option[StreamBlockId]
) {
iterators += iterator
}
def pushArrayBuffer(
arrayBuffer: ArrayBuffer[_],
optionalMetadata: Option[Any],
optionalBlockId: Option[StreamBlockId]
) {
arrayBuffers += arrayBuffer
}
def reportError(message: String, throwable: Throwable) {
errors += throwable
}
}
/**
* An implementation of BlockGeneratorListener that is used to test the BlockGenerator.
*/
class FakeBlockGeneratorListener(pushDelay: Long = 0) extends BlockGeneratorListener {
// buffer of data received as ArrayBuffers
val arrayBuffers = new ArrayBuffer[ArrayBuffer[Int]]
val errors = new ArrayBuffer[Throwable]
def onPushBlock(blockId: StreamBlockId, arrayBuffer: ArrayBuffer[_]) {
val bufferOfInts = arrayBuffer.map(_.asInstanceOf[Int])
arrayBuffers += bufferOfInts
Thread.sleep(0)
}
def onError(message: String, throwable: Throwable) {
errors += throwable
}
}
}
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