content/renderer/pepper/ppb_flash_message_loop_impl.cc

   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
  11 using ppapi::thunk::PPB_Flash_MessageLoop_API;
  12
  13 namespace content {
  14
  15 class 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
  44 PPB_Flash_MessageLoop_Impl::PPB_Flash_MessageLoop_Impl(PP_Instance instance)
  45     : Resource(ppapi::OBJECT_IS_IMPL, instance), state_(new State()) {}
  46
  47 PPB_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
  54 PP_Resource PPB_Flash_MessageLoop_Impl::Create(PP_Instance instance) {
  55   return (new PPB_Flash_MessageLoop_Impl(instance))->GetReference();
  56 }
  57
  58 PPB_Flash_MessageLoop_API*
  59 PPB_Flash_MessageLoop_Impl::AsPPB_Flash_MessageLoop_API() {
  60   return this;
  61 }
  62
  63 int32_t PPB_Flash_MessageLoop_Impl::Run() {
  64   return InternalRun(RunFromHostProxyCallback());
  65 }
  66
  67 void PPB_Flash_MessageLoop_Impl::RunFromHostProxy(
  68     const RunFromHostProxyCallback& callback) {
  69   InternalRun(callback);
  70 }
  71
  72 void PPB_Flash_MessageLoop_Impl::Quit() { InternalQuit(PP_OK); }
  73
  74 int32_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
  97 void 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