Merge pull request ReactiveX#1265 from zsxwing/rxscala-more

Add more operators to RxScala

Author: benjchristensen

language-adaptors/rxjava-scala/src/examples/scala/rx/lang/scala/examples/RxScalaDemo.scala

@@ -156,6 +156,14 @@ class RxScalaDemo extends JUnitSuite {
     ).subscribe(output(_))
   }
 
+  @Test def windowExample2() {
+    val windowObservable = Observable.interval(500 millis)
+    val o = Observable.from(1 to 20).zip(Observable.interval(100 millis)).map(_._1)
+    (for ((o, i) <- o.window(windowObservable).zipWithIndex; n <- o)
+      yield s"Observable#$i emits $n"
+    ).toBlocking.foreach(println)
+  }
+
   @Test def testReduce() {
     assertEquals(10, List(1, 2, 3, 4).toObservable.reduce(_ + _).toBlockingObservable.single)
   }
@@ -731,6 +739,23 @@ class RxScalaDemo extends JUnitSuite {
     println(result)
   }
 
+  @Test def ambWithVarargsExample(): Unit = {
+    val o1 = List(100L, 200L, 300L).toObservable.delay(4 seconds)
+    val o2 = List(1000L, 2000L, 3000L).toObservable.delay(2 seconds)
+    val o3 = List(10000L, 20000L, 30000L).toObservable.delay(4 seconds)
+    val result = Observable.amb(o1, o2, o3).toBlocking.toList
+    println(result)
+  }
+
+  @Test def ambWithSeqExample(): Unit = {
+    val o1 = List(100L, 200L, 300L).toObservable.delay(4 seconds)
+    val o2 = List(1000L, 2000L, 3000L).toObservable.delay(2 seconds)
+    val o3 = List(10000L, 20000L, 30000L).toObservable.delay(4 seconds)
+    val o = Seq(o1, o2, o3)
+    val result = Observable.amb(o: _*).toBlocking.toList
+    println(result)
+  }
+
   @Test def delayExample(): Unit = {
     val o = List(100L, 200L, 300L).toObservable.delay(2 seconds)
     val result = o.toBlockingObservable.toList
@@ -1012,4 +1037,75 @@ class RxScalaDemo extends JUnitSuite {
     subscription.unsubscribe()
   }
 
+  def createAHotObservable: Observable[String] = {
+    var first = true
+    Observable[String] {
+      subscriber =>
+        if (first) {
+          subscriber.onNext("1st: First")
+          subscriber.onNext("1st: Last")
+          first = false
+        }
+        else {
+          subscriber.onNext("2nd: First")
+          subscriber.onNext("2nd: Last")
+        }
+        subscriber.onCompleted()
+    }
+  }
+
+  @Test def withoutPublishLastExample() {
+    val hot = createAHotObservable
+    hot.takeRight(1).subscribe(n => println(s"subscriber 1 gets $n"))
+    hot.takeRight(1).subscribe(n => println(s"subscriber 2 gets $n"))
+  }
+
+  @Test def publishLastExample() {
+    val hot = createAHotObservable
+    val o = hot.publishLast
+    o.subscribe(n => println(s"subscriber 1 gets $n"))
+    o.subscribe(n => println(s"subscriber 2 gets $n"))
+    o.connect
+  }
+
+  @Test def publishLastExample2() {
+    val hot = createAHotObservable
+    val o = hot.publishLast(co => co ++ co) // "++" subscribes "co" twice
+    o.subscribe(n => println(s"subscriber gets $n"))
+  }
+
+  @Test def unsubscribeOnExample() {
+    val o = Observable[String] {
+      subscriber =>
+        subscriber.add(Subscription {
+          println("unsubscribe on " + Thread.currentThread().getName())
+        })
+        subscriber.onNext("RxScala")
+        subscriber.onCompleted()
+    }
+    o.unsubscribeOn(NewThreadScheduler()).subscribe(println(_))
+  }
+
+  @Test def parallelMergeExample() {
+    val o: Observable[Observable[Int]] = (1 to 100).toObservable.map(_ => (1 to 10).toObservable)
+    assertEquals(100, o.size.toBlockingObservable.single)
+    assertEquals(1000, o.flatten.size.toBlockingObservable.single)
+
+    val o2: Observable[Observable[Int]] = o.parallelMerge(10, ComputationScheduler())
+    assertEquals(10, o2.size.toBlockingObservable.single)
+    assertEquals(1000, o2.flatten.size.toBlockingObservable.single)
+  }
+
+  @Test def debounceExample() {
+    val o = Observable.interval(100 millis).take(20).debounce {
+      n =>
+        if (n % 2 == 0) {
+          Observable.interval(50 millis)
+        }
+        else {
+          Observable.interval(150 millis)
+        }
+    }
+    o.toBlockingObservable.foreach(println(_))
+  }
 }