1// Copyright (c) 2012 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#include "content/renderer/pepper/ppb_flash_message_loop_impl.h"
6
7#include "base/callback.h"
8#include "base/message_loop/message_loop.h"
9#include "ppapi/c/pp_errors.h"
10
11using ppapi::thunk::PPB_Flash_MessageLoop_API;
12
13namespace content {
14
15class PPB_Flash_MessageLoop_Impl::State
16    : public base::RefCounted<PPB_Flash_MessageLoop_Impl::State> {
17 public:
18  State() : result_(PP_OK), run_called_(false), quit_called_(false) {}
19
20  int32_t result() const { return result_; }
21  void set_result(int32_t result) { result_ = result; }
22
23  bool run_called() const { return run_called_; }
24  void set_run_called() { run_called_ = true; }
25
26  bool quit_called() const { return quit_called_; }
27  void set_quit_called() { quit_called_ = true; }
28
29  const RunFromHostProxyCallback& run_callback() const { return run_callback_; }
30  void set_run_callback(const RunFromHostProxyCallback& run_callback) {
31    run_callback_ = run_callback;
32  }
33
34 private:
35  friend class base::RefCounted<State>;
36  virtual ~State() {}
37
38  int32_t result_;
39  bool run_called_;
40  bool quit_called_;
41  RunFromHostProxyCallback run_callback_;
42};
43
44PPB_Flash_MessageLoop_Impl::PPB_Flash_MessageLoop_Impl(PP_Instance instance)
45    : Resource(ppapi::OBJECT_IS_IMPL, instance), state_(new State()) {}
46
47PPB_Flash_MessageLoop_Impl::~PPB_Flash_MessageLoop_Impl() {
48  // It is a no-op if either Run() hasn't been called or Quit() has been called
49  // to balance the call to Run().
50  InternalQuit(PP_ERROR_ABORTED);
51}
52
53// static
54PP_Resource PPB_Flash_MessageLoop_Impl::Create(PP_Instance instance) {
55  return (new PPB_Flash_MessageLoop_Impl(instance))->GetReference();
56}
57
58PPB_Flash_MessageLoop_API*
59PPB_Flash_MessageLoop_Impl::AsPPB_Flash_MessageLoop_API() {
60  return this;
61}
62
63int32_t PPB_Flash_MessageLoop_Impl::Run() {
64  return InternalRun(RunFromHostProxyCallback());
65}
66
67void PPB_Flash_MessageLoop_Impl::RunFromHostProxy(
68    const RunFromHostProxyCallback& callback) {
69  InternalRun(callback);
70}
71
72void PPB_Flash_MessageLoop_Impl::Quit() { InternalQuit(PP_OK); }
73
74int32_t PPB_Flash_MessageLoop_Impl::InternalRun(
75    const RunFromHostProxyCallback& callback) {
76  if (state_->run_called()) {
77    if (!callback.is_null())
78      callback.Run(PP_ERROR_FAILED);
79    return PP_ERROR_FAILED;
80  }
81  state_->set_run_called();
82  state_->set_run_callback(callback);
83
84  // It is possible that the PPB_Flash_MessageLoop_Impl object has been
85  // destroyed when the nested message loop exits.
86  scoped_refptr<State> state_protector(state_);
87  {
88    base::MessageLoop::ScopedNestableTaskAllower allow(
89        base::MessageLoop::current());
90    base::MessageLoop::current()->Run();
91  }
92  // Don't access data members of the class below.
93
94  return state_protector->result();
95}
96
97void PPB_Flash_MessageLoop_Impl::InternalQuit(int32_t result) {
98  if (!state_->run_called() || state_->quit_called())
99    return;
100  state_->set_quit_called();
101  state_->set_result(result);
102
103  base::MessageLoop::current()->QuitNow();
104
105  if (!state_->run_callback().is_null())
106    state_->run_callback().Run(result);
107}
108
109}  // namespace content
110