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
16namespace mojo {
17namespace js {
18
19class WaitingCallback : public gin::Wrappable<WaitingCallback>,
20                        public gin::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<gin::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<gin::HandleWrapper> handle_wrapper);
40  virtual ~WaitingCallback();
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  virtual void OnWillCloseHandle() OVERRIDE;
51
52  base::WeakPtr<gin::Runner> runner_;
53  MojoAsyncWaitID wait_id_;
54
55  gin::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_
64