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
21  int32_t result() const { return result_; }
22  void set_result(int32_t result) { result_ = result; }
23
24  bool run_called() const { return run_called_; }
25  void set_run_called() { run_called_ = true; }
26
27  bool quit_called() const { return quit_called_; }
28  void set_quit_called() { quit_called_ = true; }
29
30  const RunFromHostProxyCallback& run_callback() const { return run_callback_; }
31  void set_run_callback(const RunFromHostProxyCallback& run_callback) {
32    run_callback_ = run_callback;
33  }
34
35 private:
36  friend class base::RefCounted<State>;
37  virtual ~State() {}
38
39  int32_t result_;
40  bool run_called_;
41  bool quit_called_;
42  RunFromHostProxyCallback run_callback_;
43};
44
45PPB_Flash_MessageLoop_Impl::PPB_Flash_MessageLoop_Impl(PP_Instance instance)
46    : Resource(ppapi::OBJECT_IS_IMPL, instance),
47      state_(new State()) {
48}
49
50PPB_Flash_MessageLoop_Impl::~PPB_Flash_MessageLoop_Impl() {
51  // It is a no-op if either Run() hasn't been called or Quit() has been called
52  // to balance the call to Run().
53  InternalQuit(PP_ERROR_ABORTED);
54}
55
56// static
57PP_Resource PPB_Flash_MessageLoop_Impl::Create(PP_Instance instance) {
58  return (new PPB_Flash_MessageLoop_Impl(instance))->GetReference();
59}
60
61PPB_Flash_MessageLoop_API*
62    PPB_Flash_MessageLoop_Impl::AsPPB_Flash_MessageLoop_API() {
63  return this;
64}
65
66int32_t PPB_Flash_MessageLoop_Impl::Run() {
67  return InternalRun(RunFromHostProxyCallback());
68}
69
70void PPB_Flash_MessageLoop_Impl::RunFromHostProxy(
71    const RunFromHostProxyCallback& callback) {
72  InternalRun(callback);
73}
74
75void PPB_Flash_MessageLoop_Impl::Quit() {
76  InternalQuit(PP_OK);
77}
78
79int32_t PPB_Flash_MessageLoop_Impl::InternalRun(
80    const RunFromHostProxyCallback& callback) {
81  if (state_->run_called()) {
82    if (!callback.is_null())
83      callback.Run(PP_ERROR_FAILED);
84    return PP_ERROR_FAILED;
85  }
86  state_->set_run_called();
87  state_->set_run_callback(callback);
88
89  // It is possible that the PPB_Flash_MessageLoop_Impl object has been
90  // destroyed when the nested message loop exits.
91  scoped_refptr<State> state_protector(state_);
92  {
93    base::MessageLoop::ScopedNestableTaskAllower allow(
94        base::MessageLoop::current());
95    base::MessageLoop::current()->Run();
96  }
97  // Don't access data members of the class below.
98
99  return state_protector->result();
100}
101
102void PPB_Flash_MessageLoop_Impl::InternalQuit(int32_t result) {
103  if (!state_->run_called() || state_->quit_called())
104    return;
105  state_->set_quit_called();
106  state_->set_result(result);
107
108  base::MessageLoop::current()->QuitNow();
109
110  if (!state_->run_callback().is_null())
111    state_->run_callback().Run(result);
112}
113
114}  // namespace content
115