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      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
     70