Implement spawnDomFunction

tests/html/dom_isolates_test.dart

 #library('DOMIsolatesTest');
 #import('../../lib/unittest/unittest.dart');
 #import('../../lib/unittest/html_config.dart');
 #import('dart:html');
 #import('dart:isolate');
 
-isolateMain(port) {
+isolateMain() {
   port.receive((msg, replyTo) {
     if (msg != 'check') {
       replyTo.send('wrong msg: $msg');
     }
-    replyTo.send(window.location.toString());
+    replyTo.send(42);

[Anton Muhin, 2012/08/07 12:55:29]

why it's 42?  Intent of window.location.toString() (which should have been
'${window.location}' was to check DOM API is working in child isolate.

[vsm, 2012/08/10 00:06:43]

Good point.  I changed it because it's no longer 'about:blank'.  I'll keep and
compare with the main isolate's window.location instead.

On 2012/08/07 12:55:29, Anton Muhin wrote:

     port.close();
   });
 }
 
-isolateMainTrampoline(port) {
-  final childPortFuture = spawnDomIsolate(window, 'isolateMain');
+isolateMainTrampoline() {
+  final childPort = spawnDomFunction(isolateMain);
   port.receive((msg, parentPort) {
-    childPortFuture.then((childPort) {
-      childPort.call(msg).then((response) {
-        parentPort.send(response);
-        port.close();
-      });
+    childPort.call(msg).then((response) {
+      parentPort.send(response);
+      port.close();
     });
   });
 }
 
+dummy() => print("Bad invocation of top-level function");
+
 main() {
   useHtmlConfiguration();
 
-  final iframe = new Element.tag('iframe');
-  document.body.nodes.add(iframe);
-
   test('Simple DOM isolate test', () {
-    spawnDomIsolate(iframe.contentWindow, 'isolateMain').then(
-      expectAsync1((sendPort) {
-        sendPort.call('check').then(
-          expectAsync1((msg) {
-            Expect.equals('about:blank', msg);
-          }));
+    var sendPort = spawnDomFunction(isolateMain);
+    sendPort.call('check').then(
+      expectAsync1((msg) {
+        expect(msg, equals(42));
       }));
   });
 
   test('Nested DOM isolates test', () {
-    spawnDomIsolate(iframe.contentWindow, 'isolateMainTrampoline').then(
-      expectAsync1((sendPort) {
-        sendPort.call('check').then(
-          expectAsync1((msg) {
-            Expect.equals('about:blank', msg);
-          }));
+    var sendPort = spawnDomFunction(isolateMainTrampoline);

[Anton Muhin, 2012/08/07 12:55:29]

do you need sendPort at all? 
spawnDomFunction(isolateMainTrampoline).call('check')... ?  Ditto for test
above.

[vsm, 2012/08/10 00:06:43]

Done.

+    sendPort.call('check').then(
+      expectAsync1((msg) {
+        expect(msg, equals(42));
       }));
   });

[Siggi Cherem (dart-lang), 2012/08/03 17:30:57]

one more case to test would be a static method in a class (which is valid, just
like top-level functions). AFAIK, that doesn't work today in dart2js.

[vsm, 2012/08/10 00:06:43]

I'll add in a separate CL.

On 2012/08/03 17:30:57, sigmund wrote:

 
-  test('Null as target window', () {
-    expectThrow(() => spawnDomIsolate(null, 'isolateMain'));
+  test('Not function', () {
+      expect(() => spawnDomFunction(42), throws);
   });
 
-  test('Not window as target window', () {
-    expectThrow(() => spawnDomIsolate(document, 'isolateMain'));
+  test('Not topLevelFunction', () {
+    var closure = guardAsync(() {});
+    expect(() => spawnDomFunction(closure), throws);
   });
+
+  // TODO(vsm): Enable when 4337 is fixed.
+  if (false) {
+    test('Masked local function', () {
+      var local = 42;
+      dummy() => print("Bad invocation of local function: $local");
+      expect(() => spawnDomFunction(dummy), throws);
+    });
+  }
 }