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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_BINDINGS_JS_WAITING_CALLBACK_H_ | |
6 #define MOJO_BINDINGS_JS_WAITING_CALLBACK_H_ | |
7 | |
8 #include "gin/handle.h" | |
9 #include "gin/runner.h" | |
10 #include "gin/wrappable.h" | |
11 #include "mojo/bindings/js/handle.h" | |
12 #include "mojo/bindings/js/handle_close_observer.h" | |
13 #include "mojo/public/c/environment/async_waiter.h" | |
14 #include "mojo/public/cpp/system/core.h" | |
15 | |
16 namespace mojo { | |
17 namespace js { | |
18 | |
19 class WaitingCallback : public gin::Wrappable<WaitingCallback>, | |
20 public HandleCloseObserver { | |
21 public: | |
22 static gin::WrapperInfo kWrapperInfo; | |
23 | |
24 // Creates a new WaitingCallback. | |
25 static gin::Handle<WaitingCallback> Create( | |
26 v8::Isolate* isolate, | |
27 v8::Handle<v8::Function> callback, | |
28 gin::Handle<HandleWrapper> handle_wrapper, | |
29 MojoHandleSignals signals); | |
30 | |
31 // Cancels the callback. Does nothing if a callback is not pending. This is | |
32 // implicitly invoked from the destructor but can be explicitly invoked as | |
33 // necessary. | |
34 void Cancel(); | |
35 | |
36 private: | |
37 WaitingCallback(v8::Isolate* isolate, | |
38 v8::Handle<v8::Function> callback, | |
39 gin::Handle<HandleWrapper> handle_wrapper); | |
40 ~WaitingCallback() override; | |
41 | |
42 // Callback from MojoAsyncWaiter. |closure| is the WaitingCallback. | |
43 static void CallOnHandleReady(void* closure, MojoResult result); | |
44 | |
45 // Invoked from CallOnHandleReady() (CallOnHandleReady() must be static). | |
46 void OnHandleReady(MojoResult result); | |
47 | |
48 // Invoked by the HandleWrapper if the handle is closed while this wait is | |
49 // still in progress. | |
50 void OnWillCloseHandle() override; | |
51 | |
52 base::WeakPtr<gin::Runner> runner_; | |
53 MojoAsyncWaitID wait_id_; | |
54 | |
55 HandleWrapper* handle_wrapper_; | |
56 | |
57 DISALLOW_COPY_AND_ASSIGN(WaitingCallback); | |
58 }; | |
59 | |
60 } // namespace js | |
61 } // namespace mojo | |
62 | |
63 #endif // MOJO_BINDINGS_JS_WAITING_CALLBACK_H_ | |
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