Expose Service Describer in Dart mojo package

mojo/dart/packages/mojo/lib/src/application_connection.dart

Index: mojo/dart/packages/mojo/lib/src/application_connection.dart
diff --git a/mojo/dart/packages/mojo/lib/src/application_connection.dart b/mojo/dart/packages/mojo/lib/src/application_connection.dart
index a014a7ca917dad0a2d410abd564cc0658ae39b82..76929e319235fd55407f04f4884578fc8a507775 100644
--- a/mojo/dart/packages/mojo/lib/src/application_connection.dart
+++ b/mojo/dart/packages/mojo/lib/src/application_connection.dart
@@ -64,6 +64,8 @@ class ApplicationConnection {
   ServiceProviderProxy remoteServiceProvider;
   LocalServiceProvider _localServiceProvider;
   final _nameToServiceFactory = new HashMap<String, ServiceFactory>();
+  final _serviceDescriptions =
+      new HashMap<String, service_describer.ServiceDescription>();
   FallbackServiceFactory _fallbackServiceFactory;
   core.ErrorHandler onError;
 
@@ -80,8 +82,8 @@ class ApplicationConnection {
     _fallbackServiceFactory = f;
   }
 
-  bindings.ProxyBase requestService(
-      bindings.ProxyBase proxy, [String serviceName]) {
+  bindings.ProxyBase requestService(bindings.ProxyBase proxy,
+      [String serviceName]) {
     assert(!proxy.impl.isBound &&
         (remoteServiceProvider != null) &&
         remoteServiceProvider.impl.isBound);
@@ -95,10 +97,30 @@ class ApplicationConnection {
     return proxy;
   }
 
-  void provideService(String interfaceName, ServiceFactory factory) {
+  // Prepares this connection to provide the specified service when a call for

[zra, 2016/02/10 22:48:24]

Use /// so the document generator will see this comment.

[alexfandrianto, 2016/02/11 01:04:55]

Done.

+  // the given interfaceName is received. The provided service can also

[zra, 2016/02/10 22:48:24]

[interfaceName]

[alexfandrianto, 2016/02/11 01:04:55]

Done.

+  // choose to expose a service description.
+  void provideService(String interfaceName, ServiceFactory factory,
+      {service_describer.ServiceDescription description}) {
     assert(_localServiceProvider != null);
     assert(interfaceName != null);
     _nameToServiceFactory[interfaceName] = factory;
+    if (description != null) {
+      _serviceDescriptions[interfaceName] = description;
+      _provideServiceDescriber();
+    }
+  }
+
+  // Provides the ServiceDescriber interface for the set of services whose
+  // service descriptions have been provided (see provideService).
+  void _provideServiceDescriber() {
+    String describerName = service_describer.ServiceDescriber.serviceName;
+    if (_nameToServiceFactory[describerName] == null) {
+      ServiceFactory serviceDescriberFactory = (endpoint) =>
+          new _ServiceDescriberImpl(_serviceDescriptions, endpoint);
+
+      _nameToServiceFactory[describerName] = serviceDescriberFactory;

[zra, 2016/02/10 22:48:24]

_nameToServiceFactory[describerName] = (endpoint) =>
    new _ServiceDescriberImpl(_serviceDescriptions, endpoint);

[alexfandrianto, 2016/02/11 01:04:55]

Done.

+    }
   }
 
   void _errorHandler(Object e) {