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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_REQUEST_H_ | |
| 6 #define MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_REQUEST_H_ | |
| 7 | |
| 8 #include "mojo/public/cpp/bindings/interface_ptr.h" | |
| 9 | |
| 10 namespace mojo { | |
| 11 | |
| 12 // Used in methods that return instances of remote objects. | |
| 13 template <typename Interface> | |
| 14 class InterfaceRequest { | |
| 15 MOJO_MOVE_ONLY_TYPE(InterfaceRequest) | |
| 16 public: | |
| 17 InterfaceRequest() {} | |
| 18 | |
| 19 InterfaceRequest(InterfaceRequest&& other) { handle_ = other.handle_.Pass(); } | |
| 20 InterfaceRequest& operator=(InterfaceRequest&& other) { | |
| 21 handle_ = other.handle_.Pass(); | |
| 22 return *this; | |
| 23 } | |
| 24 | |
| 25 // Returns true if the request has yet to be completed. | |
| 26 bool is_pending() const { return handle_.is_valid(); } | |
| 27 | |
| 28 void Bind(ScopedMessagePipeHandle handle) { handle_ = handle.Pass(); } | |
| 29 | |
| 30 ScopedMessagePipeHandle PassMessagePipe() { return handle_.Pass(); } | |
| 31 | |
| 32 private: | |
| 33 ScopedMessagePipeHandle handle_; | |
| 34 }; | |
| 35 | |
| 36 template <typename Interface> | |
| 37 InterfaceRequest<Interface> MakeRequest(ScopedMessagePipeHandle handle) { | |
| 38 InterfaceRequest<Interface> request; | |
| 39 request.Bind(handle.Pass()); | |
| 40 return request.Pass(); | |
| 41 } | |
| 42 | |
| 43 // Used to construct a request that synchronously binds an InterfacePtr<..>, | |
| 44 // making it immediately usable upon return. The resulting request object may | |
| 45 // then be later bound to an InterfaceImpl<..> via BindToRequest. | |
| 46 // | |
| 47 // Given the following interface: | |
| 48 // | |
| 49 // interface Foo { | |
| 50 // CreateBar(Bar& bar); | |
| 51 // } | |
| 52 // | |
| 53 // The caller of CreateBar would have code similar to the following: | |
| 54 // | |
| 55 // InterfacePtr<Foo> foo = ...; | |
| 56 // InterfacePtr<Bar> bar; | |
| 57 // foo->CreateBar(GetProxy(&bar)); | |
| 58 // | |
| 59 // Upon return from CreateBar, |bar| is ready to have methods called on it. | |
| 60 // | |
| 61 template <typename Interface> | |
| 62 InterfaceRequest<Interface> GetProxy(InterfacePtr<Interface>* ptr) { | |
| 63 MessagePipe pipe; | |
| 64 ptr->Bind(pipe.handle0.Pass()); | |
| 65 return MakeRequest<Interface>(pipe.handle1.Pass()); | |
| 66 } | |
| 67 | |
| 68 } // namespace mojo | |
| 69 | |
| 70 #endif // MOJO_PUBLIC_CPP_BINDINGS_INTERFACE_REQUEST_H_ | |
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