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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.util
import scala.collection.mutable
import scala.collection.mutable.ArrayBuffer
import scala.util.Random
import org.apache.spark.SparkFunSuite
class TimeStampedHashMapSuite extends SparkFunSuite {
// Test the testMap function - a Scala HashMap should obviously pass
testMap(new mutable.HashMap[String, String]())
// Test TimeStampedHashMap basic functionality
testMap(new TimeStampedHashMap[String, String]())
testMapThreadSafety(new TimeStampedHashMap[String, String]())
test("TimeStampedHashMap - clearing by timestamp") {
// clearing by insertion time
val map = new TimeStampedHashMap[String, String](updateTimeStampOnGet = false)
map("k1") = "v1"
assert(map("k1") === "v1")
Thread.sleep(10)
val threshTime = System.currentTimeMillis
assert(map.getTimestamp("k1").isDefined)
assert(map.getTimestamp("k1").get < threshTime)
map.clearOldValues(threshTime)
assert(map.get("k1") === None)
// clearing by modification time
val map1 = new TimeStampedHashMap[String, String](updateTimeStampOnGet = true)
map1("k1") = "v1"
map1("k2") = "v2"
assert(map1("k1") === "v1")
Thread.sleep(10)
val threshTime1 = System.currentTimeMillis
Thread.sleep(10)
assert(map1("k2") === "v2") // access k2 to update its access time to > threshTime
assert(map1.getTimestamp("k1").isDefined)
assert(map1.getTimestamp("k1").get < threshTime1)
assert(map1.getTimestamp("k2").isDefined)
assert(map1.getTimestamp("k2").get >= threshTime1)
map1.clearOldValues(threshTime1) // should only clear k1
assert(map1.get("k1") === None)
assert(map1.get("k2").isDefined)
}
/** Test basic operations of a Scala mutable Map. */
def testMap(hashMapConstructor: => mutable.Map[String, String]) {
def newMap() = hashMapConstructor
val testMap1 = newMap()
val testMap2 = newMap()
val name = testMap1.getClass.getSimpleName
test(name + " - basic test") {
// put, get, and apply
testMap1 += (("k1", "v1"))
assert(testMap1.get("k1").isDefined)
assert(testMap1.get("k1").get === "v1")
testMap1("k2") = "v2"
assert(testMap1.get("k2").isDefined)
assert(testMap1.get("k2").get === "v2")
assert(testMap1("k2") === "v2")
testMap1.update("k3", "v3")
assert(testMap1.get("k3").isDefined)
assert(testMap1.get("k3").get === "v3")
// remove
testMap1.remove("k1")
assert(testMap1.get("k1").isEmpty)
testMap1.remove("k2")
intercept[NoSuchElementException] {
testMap1("k2") // Map.apply(<non-existent-key>) causes exception
}
testMap1 -= "k3"
assert(testMap1.get("k3").isEmpty)
// multi put
val keys = (1 to 100).map(_.toString)
val pairs = keys.map(x => (x, x * 2))
assert((testMap2 ++ pairs).iterator.toSet === pairs.toSet)
testMap2 ++= pairs
// iterator
assert(testMap2.iterator.toSet === pairs.toSet)
// filter
val filtered = testMap2.filter { case (_, v) => v.toInt % 2 == 0 }
val evenPairs = pairs.filter { case (_, v) => v.toInt % 2 == 0 }
assert(filtered.iterator.toSet === evenPairs.toSet)
// foreach
val buffer = new ArrayBuffer[(String, String)]
testMap2.foreach(x => buffer += x)
assert(testMap2.toSet === buffer.toSet)
// multi remove
testMap2("k1") = "v1"
testMap2 --= keys
assert(testMap2.size === 1)
assert(testMap2.iterator.toSeq.head === ("k1", "v1"))
// +
val testMap3 = testMap2 + (("k0", "v0"))
assert(testMap3.size === 2)
assert(testMap3.get("k1").isDefined)
assert(testMap3.get("k1").get === "v1")
assert(testMap3.get("k0").isDefined)
assert(testMap3.get("k0").get === "v0")
// -
val testMap4 = testMap3 - "k0"
assert(testMap4.size === 1)
assert(testMap4.get("k1").isDefined)
assert(testMap4.get("k1").get === "v1")
}
}
/** Test thread safety of a Scala mutable map. */
def testMapThreadSafety(hashMapConstructor: => mutable.Map[String, String]) {
def newMap() = hashMapConstructor
val name = newMap().getClass.getSimpleName
val testMap = newMap()
@volatile var error = false
def getRandomKey(m: mutable.Map[String, String]): Option[String] = {
val keys = testMap.keysIterator.toSeq
if (keys.nonEmpty) {
Some(keys(Random.nextInt(keys.size)))
} else {
None
}
}
val threads = (1 to 25).map(i => new Thread() {
override def run() {
try {
for (j <- 1 to 1000) {
Random.nextInt(3) match {
case 0 =>
testMap(Random.nextString(10)) = Random.nextDouble().toString // put
case 1 =>
getRandomKey(testMap).map(testMap.get) // get
case 2 =>
getRandomKey(testMap).map(testMap.remove) // remove
}
}
} catch {
case t: Throwable =>
error = true
throw t
}
}
})
test(name + " - threading safety test") {
threads.foreach(_.start())
threads.foreach(_.join())
assert(!error)
}
}
}
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