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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_EDK_JS_WAITING_CALLBACK_H_ | |
6 #define MOJO_EDK_JS_WAITING_CALLBACK_H_ | |
7 | |
8 #include "base/memory/weak_ptr.h" | |
9 #include "gin/handle.h" | |
10 #include "gin/runner.h" | |
11 #include "gin/wrappable.h" | |
12 #include "mojo/edk/js/handle.h" | |
13 #include "mojo/edk/js/handle_close_observer.h" | |
14 #include "mojo/public/c/environment/async_waiter.h" | |
15 #include "mojo/public/cpp/system/core.h" | |
16 | |
17 namespace mojo { | |
18 namespace js { | |
19 | |
20 class WaitingCallback : public gin::Wrappable<WaitingCallback>, | |
21 public HandleCloseObserver { | |
22 public: | |
23 static gin::WrapperInfo kWrapperInfo; | |
24 | |
25 // Creates a new WaitingCallback. | |
26 static gin::Handle<WaitingCallback> Create( | |
27 v8::Isolate* isolate, | |
28 v8::Handle<v8::Function> callback, | |
29 gin::Handle<HandleWrapper> handle_wrapper, | |
30 MojoHandleSignals signals); | |
31 | |
32 // Cancels the callback. Does nothing if a callback is not pending. This is | |
33 // implicitly invoked from the destructor but can be explicitly invoked as | |
34 // necessary. | |
35 void Cancel(); | |
36 | |
37 private: | |
38 WaitingCallback(v8::Isolate* isolate, | |
39 v8::Handle<v8::Function> callback, | |
40 gin::Handle<HandleWrapper> handle_wrapper); | |
41 ~WaitingCallback() override; | |
42 | |
43 // Callback from MojoAsyncWaiter. |closure| is the WaitingCallback. | |
44 static void CallOnHandleReady(void* closure, MojoResult result); | |
45 | |
46 // Invoked from CallOnHandleReady() (CallOnHandleReady() must be static). | |
47 void OnHandleReady(MojoResult result); | |
48 | |
49 // Invoked by the HandleWrapper if the handle is closed while this wait is | |
50 // still in progress. | |
51 void OnWillCloseHandle() override; | |
52 | |
53 void ClearWaitId(); | |
54 void CallCallback(MojoResult result); | |
55 | |
56 base::WeakPtr<gin::Runner> runner_; | |
57 MojoAsyncWaitID wait_id_; | |
58 | |
59 HandleWrapper* handle_wrapper_; | |
60 base::WeakPtrFactory<WaitingCallback> weak_factory_; | |
61 | |
62 DISALLOW_COPY_AND_ASSIGN(WaitingCallback); | |
63 }; | |
64 | |
65 } // namespace js | |
66 } // namespace mojo | |
67 | |
68 #endif // MOJO_EDK_JS_WAITING_CALLBACK_H_ | |
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