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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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