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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 
GamepadService()16 GamepadService::GamepadService() : num_readers_(0) {
17 }
18 
GamepadService(scoped_ptr<GamepadDataFetcher> fetcher)19 GamepadService::GamepadService(scoped_ptr<GamepadDataFetcher> fetcher)
20     : num_readers_(0),
21       provider_(new GamepadProvider(fetcher.Pass())) {
22   thread_checker_.DetachFromThread();
23 }
24 
~GamepadService()25 GamepadService::~GamepadService() {
26 }
27 
GetInstance()28 GamepadService* GamepadService::GetInstance() {
29   return Singleton<GamepadService,
30                    LeakySingletonTraits<GamepadService> >::get();
31 }
32 
AddConsumer()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 
RemoveConsumer()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 
RegisterForUserGesture(const base::Closure & closure)53 void GamepadService::RegisterForUserGesture(const base::Closure& closure) {
54   DCHECK(num_readers_ > 0);
55   DCHECK(thread_checker_.CalledOnValidThread());
56   provider_->RegisterForUserGesture(closure);
57 }
58 
Terminate()59 void GamepadService::Terminate() {
60   provider_.reset();
61 }
62 
GetSharedMemoryHandleForProcess(base::ProcessHandle handle)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