Add playground examples for structured concurrency

Author: LukasLechnerDev

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/structuredconcurrency/5_exception_propagation.kt

@@ -0,0 +1,34 @@
+package com.lukaslechner.coroutineusecasesonandroid.playground.structuredconcurrency
+
+import kotlinx.coroutines.*
+
+fun main() {
+
+    val exceptionHandler = CoroutineExceptionHandler { context, exception ->
+        println("Caught exception $exception")
+    }
+
+    val scope = CoroutineScope(SupervisorJob() + exceptionHandler)
+
+    scope.launch {
+        println("Coroutine 1 starts")
+        delay(50)
+        println("Coroutine 1 fails")
+        throw RuntimeException()
+    }
+
+    scope.launch {
+        println("Coroutine 2 starts")
+        delay(500)
+        println("Coroutine 2 completed")
+    }.invokeOnCompletion { throwable ->
+        if (throwable is CancellationException) {
+            println("Coroutine 2 got cancelled!")
+        }
+    }
+
+    Thread.sleep(1000)
+
+    println("Scope got cancelled: ${!scope.isActive}")
+
+}

app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/structuredconcurrency/5_globalscope.kt renamed to app/src/main/java/com/lukaslechner/coroutineusecasesonandroid/playground/structuredconcurrency/6_globalscope.kt

@@ -0,0 +1,35 @@
+package com.lukaslechner.coroutineusecasesonandroid.playground.structuredconcurrency
+
+import kotlinx.coroutines.*
+
+fun main() {
+
+    val scope = CoroutineScope(Job())
+
+    scope.launch {
+
+        doSomeTasks()
+
+        launch {
+            println("Starting Task 3")
+            delay(300)
+            println("Task 3 completed")
+        }
+    }
+
+    Thread.sleep(1000)
+}
+
+suspend fun doSomeTasks() = coroutineScope {
+    launch {
+        println("Starting Task 1")
+        delay(100)
+        println("Task 1 completed")
+    }
+
+    launch {
+        println("Starting Task 2")
+        delay(200)
+        println("Task 2 completed")
+    }
+}