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Side by Side Diff: mojo/public/cpp/bindings/interface_request.h

Issue 814543006: Move //mojo/{public, edk} underneath //third_party (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 5 years, 11 months ago
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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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