Data commit

Task/Concurrent-computing/Dart/concurrent-computing-1.dart

@@ -0,0 +1,16 @@
+import 'dart:math' show Random;
+
+main(){
+	enjoy()   .then( (e) => print(e) );
+	rosetta() .then( (r) => print(r) );
+	code()    .then( (c) => print(c) );
+}
+
+// Create random number generator
+var rng = Random();
+
+// Each function returns a future that starts after a delay
+// Like using setTimeout with a Promise in Javascript
+enjoy()   => Future.delayed( Duration( milliseconds: rng.nextInt( 10 ) ), () => "Enjoy");
+rosetta() => Future.delayed( Duration( milliseconds: rng.nextInt( 10 ) ), () => "Rosetta");
+code()    => Future.delayed( Duration( milliseconds: rng.nextInt( 10 ) ), () => "Code");

Task/Concurrent-computing/Dart/concurrent-computing-2.dart

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+import 'dart:isolate' show Isolate, ReceivePort;
+import 'dart:io'      show exit, sleep;
+import 'dart:math'    show Random;
+
+main() {
+	// Create ReceivePort to receive done messages
+	// Called a channel in other languages
+	var receiver = ReceivePort();
+
+	// Create job counter
+	var job_count = 3;
+	
+	// Create job pool
+	var jobs = [ enjoy, rosetta, code ];
+
+	// Create random number generator
+	var rng = Random();
+
+	for ( var job in jobs ) {
+		// Sleep for random duration up to half a second
+		var sleep_time = Duration( milliseconds: rng.nextInt( 500 ) );	
+
+		// Spawn  Isolate to do work
+		// When finished the second argument will be sent to the receiver via the SendPort specified in onExit
+		Isolate.spawn( job, sleep_time, onExit: receiver.sendPort );
+
+	}
+	
+	// Do something in main isolate
+	print("from main isolate\n");
+	
+	// Register a listener on the ReceivePort, it gets called whenver something is sent on its SendPort
+	// We'll ignore the message with _ because we don't care about the data, just the event
+	receiver.listen( (_) {
+		// Decrement job counter
+		job_count -= 1; 	
+		// If jobs are all finished
+		if ( job_count == 0 ) {
+			print("\nall jobs finished!");
+			exit(0);
+		}
+	});
+
+}
+
+enjoy ( duration ) {
+	sleep( duration ) ;
+	print("Enjoy");
+}
+
+rosetta ( duration ) {
+	sleep( duration );
+	print("Rosetta");
+ }
+
+code ( duration ) {
+	sleep( duration );
+	print("Code");
+}