Dart: Wait to handle events on a Stub until it makes sense to do it.

mojo/dart/packages/mojo_services/lib/keyboard/keyboard.mojom.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.
 
 library keyboard_mojom;
 import 'dart:async';
 import 'package:mojo/bindings.dart' as bindings;
 import 'package:mojo/core.dart' as core;
 import 'package:mojo/mojo/bindings/types/service_describer.mojom.dart' as service_describer;
 import 'package:mojo_services/mojo/native_viewport_event_dispatcher.mojom.dart' as native_viewport_event_dispatcher_mojom;
@@ skipping 1626 matching lines @@
     impl.requireVersion(requiredVersion);
   }
 
   String toString() {
     return "KeyboardClientProxy($impl)";
   }
 }
 
 
 class KeyboardClientStub extends bindings.Stub {
-  KeyboardClient _impl = null;
+  KeyboardClient _impl;
 
   KeyboardClientStub.fromEndpoint(
-      core.MojoMessagePipeEndpoint endpoint, [this._impl])
-      : super.fromEndpoint(endpoint);
+      core.MojoMessagePipeEndpoint endpoint, [KeyboardClient impl])
+      : super.fromEndpoint(endpoint, autoBegin: impl != null) {
+    _impl = impl;
+  }
 
-  KeyboardClientStub.fromHandle(core.MojoHandle handle, [this._impl])
-      : super.fromHandle(handle);
+  KeyboardClientStub.fromHandle(
+      core.MojoHandle handle, [KeyboardClient impl])
+      : super.fromHandle(handle, autoBegin: impl != null) {
+    _impl = impl;
+  }
 
   KeyboardClientStub.unbound() : super.unbound();
 
   static KeyboardClientStub newFromEndpoint(
       core.MojoMessagePipeEndpoint endpoint) {
     assert(endpoint.setDescription("For KeyboardClientStub"));
     return new KeyboardClientStub.fromEndpoint(endpoint);
   }
 
 
 
   dynamic handleMessage(bindings.ServiceMessage message) {
     if (bindings.ControlMessageHandler.isControlMessage(message)) {
       return bindings.ControlMessageHandler.handleMessage(this,
                                                           0,
                                                           message);
     }
-    assert(_impl != null);
+    if (_impl == null) {
+      throw new core.MojoApiError("$this has no implementation set");
+    }
     switch (message.header.type) {
       case _keyboardClientMethodCommitCompletionName:
         var params = _KeyboardClientCommitCompletionParams.deserialize(
             message.payload);
         _impl.commitCompletion(params.completion);
         break;
       case _keyboardClientMethodCommitCorrectionName:
         var params = _KeyboardClientCommitCorrectionParams.deserialize(
             message.payload);
         _impl.commitCorrection(params.correction);
@@ skipping 30 matching lines @@
         break;
       default:
         throw new bindings.MojoCodecError("Unexpected message name");
         break;
     }
     return null;
   }
 
   KeyboardClient get impl => _impl;
   set impl(KeyboardClient d) {
-    assert(_impl == null);
+    if (d == null) {
+      throw new core.MojoApiError("$this: Cannot set a null implementation");
+    }
+    if (isBound && (_impl == null)) {
+      beginHandlingEvents();
+    }
     _impl = d;
   }
 
+  @override
+  void bind(core.MojoMessagePipeEndpoint endpoint) {
+    super.bind(endpoint);
+    if (!isOpen && (_impl != null)) {
+      beginHandlingEvents();
+    }
+  }
+
   String toString() {
     var superString = super.toString();
     return "KeyboardClientStub($superString)";
   }
 
   int get version => 0;
 
   static service_describer.ServiceDescription _cachedServiceDescription;
   static service_describer.ServiceDescription get serviceDescription {
     if (_cachedServiceDescription == null) {
@@ skipping 169 matching lines @@
     impl.requireVersion(requiredVersion);
   }
 
   String toString() {
     return "KeyboardServiceProxy($impl)";
   }
 }
 
 
 class KeyboardServiceStub extends bindings.Stub {
-  KeyboardService _impl = null;
+  KeyboardService _impl;
 
   KeyboardServiceStub.fromEndpoint(
-      core.MojoMessagePipeEndpoint endpoint, [this._impl])
-      : super.fromEndpoint(endpoint);
+      core.MojoMessagePipeEndpoint endpoint, [KeyboardService impl])
+      : super.fromEndpoint(endpoint, autoBegin: impl != null) {
+    _impl = impl;
+  }
 
-  KeyboardServiceStub.fromHandle(core.MojoHandle handle, [this._impl])
-      : super.fromHandle(handle);
+  KeyboardServiceStub.fromHandle(
+      core.MojoHandle handle, [KeyboardService impl])
+      : super.fromHandle(handle, autoBegin: impl != null) {
+    _impl = impl;
+  }
 
   KeyboardServiceStub.unbound() : super.unbound();
 
   static KeyboardServiceStub newFromEndpoint(
       core.MojoMessagePipeEndpoint endpoint) {
     assert(endpoint.setDescription("For KeyboardServiceStub"));
     return new KeyboardServiceStub.fromEndpoint(endpoint);
   }
 
 
 
   dynamic handleMessage(bindings.ServiceMessage message) {
     if (bindings.ControlMessageHandler.isControlMessage(message)) {
       return bindings.ControlMessageHandler.handleMessage(this,
                                                           0,
                                                           message);
     }
-    assert(_impl != null);
+    if (_impl == null) {
+      throw new core.MojoApiError("$this has no implementation set");
+    }
     switch (message.header.type) {
       case _keyboardServiceMethodShowName:
         var params = _KeyboardServiceShowParams.deserialize(
             message.payload);
         _impl.show(params.client, params.type);
         break;
       case _keyboardServiceMethodShowByRequestName:
         _impl.showByRequest();
         break;
       case _keyboardServiceMethodHideName:
@@ skipping 11 matching lines @@
         break;
       default:
         throw new bindings.MojoCodecError("Unexpected message name");
         break;
     }
     return null;
   }
 
   KeyboardService get impl => _impl;
   set impl(KeyboardService d) {
-    assert(_impl == null);
+    if (d == null) {
+      throw new core.MojoApiError("$this: Cannot set a null implementation");
+    }
+    if (isBound && (_impl == null)) {
+      beginHandlingEvents();
+    }
     _impl = d;
   }
 
+  @override
+  void bind(core.MojoMessagePipeEndpoint endpoint) {
+    super.bind(endpoint);
+    if (!isOpen && (_impl != null)) {
+      beginHandlingEvents();
+    }
+  }
+
   String toString() {
     var superString = super.toString();
     return "KeyboardServiceStub($superString)";
   }
 
   int get version => 0;
 
   static service_describer.ServiceDescription _cachedServiceDescription;
   static service_describer.ServiceDescription get serviceDescription {
     if (_cachedServiceDescription == null) {
@@ skipping 126 matching lines @@
     impl.requireVersion(requiredVersion);
   }
 
   String toString() {
     return "KeyboardServiceFactoryProxy($impl)";
   }
 }
 
 
 class KeyboardServiceFactoryStub extends bindings.Stub {
-  KeyboardServiceFactory _impl = null;
+  KeyboardServiceFactory _impl;
 
   KeyboardServiceFactoryStub.fromEndpoint(
-      core.MojoMessagePipeEndpoint endpoint, [this._impl])
-      : super.fromEndpoint(endpoint);
+      core.MojoMessagePipeEndpoint endpoint, [KeyboardServiceFactory impl])
+      : super.fromEndpoint(endpoint, autoBegin: impl != null) {
+    _impl = impl;
+  }
 
-  KeyboardServiceFactoryStub.fromHandle(core.MojoHandle handle, [this._impl])
-      : super.fromHandle(handle);
+  KeyboardServiceFactoryStub.fromHandle(
+      core.MojoHandle handle, [KeyboardServiceFactory impl])
+      : super.fromHandle(handle, autoBegin: impl != null) {
+    _impl = impl;
+  }
 
   KeyboardServiceFactoryStub.unbound() : super.unbound();
 
   static KeyboardServiceFactoryStub newFromEndpoint(
       core.MojoMessagePipeEndpoint endpoint) {
     assert(endpoint.setDescription("For KeyboardServiceFactoryStub"));
     return new KeyboardServiceFactoryStub.fromEndpoint(endpoint);
   }
 
 
 
   dynamic handleMessage(bindings.ServiceMessage message) {
     if (bindings.ControlMessageHandler.isControlMessage(message)) {
       return bindings.ControlMessageHandler.handleMessage(this,
                                                           0,
                                                           message);
     }
-    assert(_impl != null);
+    if (_impl == null) {
+      throw new core.MojoApiError("$this has no implementation set");
+    }
     switch (message.header.type) {
       case _keyboardServiceFactoryMethodCreateKeyboardServiceName:
         var params = _KeyboardServiceFactoryCreateKeyboardServiceParams.deserialize(
             message.payload);
         _impl.createKeyboardService(params.keyEventDispatcher, params.serviceRequest);
         break;
       default:
         throw new bindings.MojoCodecError("Unexpected message name");
         break;
     }
     return null;
   }
 
   KeyboardServiceFactory get impl => _impl;
   set impl(KeyboardServiceFactory d) {
-    assert(_impl == null);
+    if (d == null) {
+      throw new core.MojoApiError("$this: Cannot set a null implementation");
+    }
+    if (isBound && (_impl == null)) {
+      beginHandlingEvents();
+    }
     _impl = d;
   }
 
+  @override
+  void bind(core.MojoMessagePipeEndpoint endpoint) {
+    super.bind(endpoint);
+    if (!isOpen && (_impl != null)) {
+      beginHandlingEvents();
+    }
+  }
+
   String toString() {
     var superString = super.toString();
     return "KeyboardServiceFactoryStub($superString)";
   }
 
   int get version => 0;
 
   static service_describer.ServiceDescription _cachedServiceDescription;
   static service_describer.ServiceDescription get serviceDescription {
     if (_cachedServiceDescription == null) {
       _cachedServiceDescription = new _KeyboardServiceFactoryServiceDescription();
     }
     return _cachedServiceDescription;
   }
 }