content/browser/gamepad/gamepad_service.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/browser/gamepad/gamepad_service.h"
   6
   7 #include "base/bind.h"
   8 #include "base/logging.h"
   9 #include "base/memory/singleton.h"
  10 #include "content/browser/gamepad/gamepad_data_fetcher.h"
  11 #include "content/browser/gamepad/gamepad_provider.h"
  12 #include "content/public/browser/render_process_host.h"
  13
  14 namespace content {
  15
  16 GamepadService::GamepadService() : num_readers_(0) {
  17 }
  18
  19 GamepadService::GamepadService(scoped_ptr<GamepadDataFetcher> fetcher)
  20     : num_readers_(0),
  21       provider_(new GamepadProvider(fetcher.Pass())) {
  22   thread_checker_.DetachFromThread();
  23 }
  24
  25 GamepadService::~GamepadService() {
  26 }
  27
  28 GamepadService* GamepadService::GetInstance() {
  29   return Singleton<GamepadService,
  30                    LeakySingletonTraits<GamepadService> >::get();
  31 }
  32
  33 void GamepadService::AddConsumer() {
  34   DCHECK(thread_checker_.CalledOnValidThread());
  35
  36   num_readers_++;
  37   DCHECK(num_readers_ > 0);
  38   if (!provider_)
  39     provider_.reset(new GamepadProvider);
  40   provider_->Resume();
  41 }
  42
  43 void GamepadService::RemoveConsumer() {
  44   DCHECK(thread_checker_.CalledOnValidThread());
  45
  46   --num_readers_;
  47   DCHECK(num_readers_ >= 0);
  48
  49   if (num_readers_ == 0)
  50     provider_->Pause();
  51 }
  52
  53 void GamepadService::RegisterForUserGesture(const base::Closure& closure) {
  54   DCHECK(num_readers_ > 0);
  55   DCHECK(thread_checker_.CalledOnValidThread());
  56   provider_->RegisterForUserGesture(closure);
  57 }
  58
  59 void GamepadService::Terminate() {
  60   provider_.reset();
  61 }
  62
  63 base::SharedMemoryHandle GamepadService::GetSharedMemoryHandleForProcess(
  64     base::ProcessHandle handle) {
  65   DCHECK(thread_checker_.CalledOnValidThread());
  66   return provider_->GetSharedMemoryHandleForProcess(handle);
  67 }
  68
  69 }  // namespace content