Initial work on Dart bindings for Mojo.

mojo/public/dart/system/tests/event_handler_test.dart

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+import 'dart:isolate';
+import 'dart:typed_data';
+
+import 'package:mojo/public/dart/utils/lib/expect.dart';
+import 'package:mojo/public/dart/system/lib/core.dart';
+import 'package:mojo/public/dart/system/lib/embedder.dart' as embedder;
+
+
+ByteData byteDataOfString(String s) {
+  return new ByteData.view((new Uint8List.fromList(s.codeUnits)).buffer);
+}
+
+
+String stringOfByteData(ByteData bytes) {
+  return new String.fromCharCodes(bytes.buffer.asUint8List().toList());
+}
+
+
+void rawMessagePingPongIsolate(MojoMessagePipeEndpoint endpoint) {
+  int pings = 0;
+  MojoHandle handle = new MojoHandle(endpoint.handle);
+  handle.listen((int mojo_handle_signal) {
+    if (MojoHandleSignals.isReadWrite(mojo_handle_signal)) {
+      throw new Exception("Unexpected signal");
+    } else if (MojoHandleSignals.isReadable(mojo_handle_signal)) {
+      // Query how many bytes are available.
+      List result = endpoint.query();
+      int size = result[1];
+
+      // Read the data.
+      ByteData bytes = new ByteData(size);
+      endpoint.read(bytes);
+
+      // Convert to string and output.
+      String msg = stringOfByteData(bytes);
+      Expect.equals("Ping", msg);
+      pings = 10;
+      handle.toggleWriteEvents();
+    } else if (MojoHandleSignals.isWritable(mojo_handle_signal)) {
+      endpoint.write(byteDataOfString("Pong"));
+      handle.toggleWriteEvents();
+    }
+  }, onDone: () {
+    handle.close();
+    Expect.equals(10, pings);
+  });
+}
+
+
+void rawMessagePingPongTest() {
+  var pipe = new MojoMessagePipe();
+
+  Isolate.spawn(rawMessagePingPongIsolate, pipe.endpoints[0]).then((isolate) {
+    MojoMessagePipeEndpoint endpoint = pipe.endpoints[1];
+    MojoHandle handle = new MojoHandle(endpoint.handle);
+    handle.toggleWriteEvents();
+    int count = 10;
+    int pongs = 0;
+    handle.timeout(const Duration(seconds: 1),
+      onTimeout: (es) {
+        es.close();
+      }).listen((int mojo_handle_signal) {
+        if (MojoHandleSignals.isReadWrite(mojo_handle_signal)) {
+          throw new Exception("Unexpected signal");
+        } else if (MojoHandleSignals.isReadable(mojo_handle_signal)) {
+          // Query how many bytes are available.
+          List result = endpoint.query();
+          int size = result[1];
+
+          // Read the data.
+          ByteData bytes = new ByteData(size);
+          endpoint.read(bytes);
+
+          // Convert to string and output.
+          String msg = stringOfByteData(bytes);
+          Expect.equals("Pong", msg);
+          pongs++;
+          handle.toggleWriteEvents();
+          count--;
+        } else if (MojoHandleSignals.isWritable(mojo_handle_signal)) {
+          if (count > 0) {
+            endpoint.write(byteDataOfString("Ping"));
+          }
+          handle.toggleWriteEvents();
+        }
+      }, onDone: () {
+        handle.close();
+        Expect.equals(10, pongs);
+      });
+  });
+}
+
+
+main() {
+  embedder.mojoEmbedderInit().then((status) {
+    rawMessagePingPongTest();
+  });
+}