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1 // Copyright 2014 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/device_sensors/device_sensor_service.h" | |
6 | |
7 #include "base/bind.h" | |
8 #include "base/logging.h" | |
9 #include "base/memory/singleton.h" | |
10 #include "content/browser/device_sensors/data_fetcher_shared_memory.h" | |
11 | |
12 namespace content { | |
13 | |
14 DeviceSensorService::DeviceSensorService() | |
15 : num_light_readers_(0), | |
16 num_motion_readers_(0), | |
17 num_orientation_readers_(0), | |
18 num_orientation_absolute_readers_(0), | |
19 is_shutdown_(false) {} | |
20 | |
21 DeviceSensorService::~DeviceSensorService() {} | |
22 | |
23 DeviceSensorService* DeviceSensorService::GetInstance() { | |
24 return base::Singleton<DeviceSensorService, base::LeakySingletonTraits< | |
25 DeviceSensorService>>::get(); | |
26 } | |
27 | |
28 void DeviceSensorService::AddConsumer(ConsumerType consumer_type) { | |
29 if (!ChangeNumberConsumers(consumer_type, 1)) | |
30 return; | |
31 | |
32 DCHECK(GetNumberConsumers(consumer_type)); | |
33 | |
34 if (!data_fetcher_) | |
35 data_fetcher_.reset(new DataFetcherSharedMemory); | |
36 data_fetcher_->StartFetchingDeviceData(consumer_type); | |
37 } | |
38 | |
39 void DeviceSensorService::RemoveConsumer(ConsumerType consumer_type) { | |
40 if (!ChangeNumberConsumers(consumer_type, -1)) | |
41 return; | |
42 | |
43 if (GetNumberConsumers(consumer_type) == 0) | |
44 data_fetcher_->StopFetchingDeviceData(consumer_type); | |
45 } | |
46 | |
47 bool DeviceSensorService::ChangeNumberConsumers(ConsumerType consumer_type, | |
48 int delta) { | |
49 DCHECK(thread_checker_.CalledOnValidThread()); | |
50 if (is_shutdown_) | |
51 return false; | |
52 | |
53 switch (consumer_type) { | |
54 case CONSUMER_TYPE_MOTION: | |
55 num_motion_readers_ += delta; | |
56 DCHECK_GE(num_motion_readers_, 0); | |
57 return true; | |
58 case CONSUMER_TYPE_ORIENTATION: | |
59 num_orientation_readers_ += delta; | |
60 DCHECK_GE(num_orientation_readers_, 0); | |
61 return true; | |
62 case CONSUMER_TYPE_ORIENTATION_ABSOLUTE: | |
63 num_orientation_absolute_readers_ += delta; | |
64 DCHECK_GE(num_orientation_absolute_readers_, 0); | |
65 return true; | |
66 case CONSUMER_TYPE_LIGHT: | |
67 num_light_readers_ += delta; | |
68 DCHECK_GE(num_light_readers_, 0); | |
69 return true; | |
70 default: | |
71 NOTREACHED(); | |
72 } | |
73 return false; | |
74 } | |
75 | |
76 int DeviceSensorService::GetNumberConsumers(ConsumerType consumer_type) const { | |
77 switch (consumer_type) { | |
78 case CONSUMER_TYPE_MOTION: | |
79 return num_motion_readers_; | |
80 case CONSUMER_TYPE_ORIENTATION: | |
81 return num_orientation_readers_; | |
82 case CONSUMER_TYPE_ORIENTATION_ABSOLUTE: | |
83 return num_orientation_absolute_readers_; | |
84 case CONSUMER_TYPE_LIGHT: | |
85 return num_light_readers_; | |
86 default: | |
87 NOTREACHED(); | |
88 } | |
89 return 0; | |
90 } | |
91 | |
92 mojo::ScopedSharedBufferHandle DeviceSensorService::GetSharedMemoryHandle( | |
93 ConsumerType consumer_type) { | |
94 DCHECK(thread_checker_.CalledOnValidThread()); | |
95 return data_fetcher_->GetSharedMemoryHandle(consumer_type); | |
96 } | |
97 | |
98 void DeviceSensorService::Shutdown() { | |
99 if (data_fetcher_) { | |
100 data_fetcher_->Shutdown(); | |
101 data_fetcher_.reset(); | |
102 } | |
103 is_shutdown_ = true; | |
104 } | |
105 | |
106 void DeviceSensorService::SetDataFetcherForTesting( | |
107 DataFetcherSharedMemory* test_data_fetcher) { | |
108 if (data_fetcher_) | |
109 data_fetcher_->Shutdown(); | |
110 data_fetcher_.reset(test_data_fetcher); | |
111 } | |
112 | |
113 } // namespace content | |
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