1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/device_sensors/device_inertial_sensor_service.h"
#include "base/bind.h"
#include "base/logging.h"
#include "base/memory/singleton.h"
#include "content/browser/device_sensors/data_fetcher_shared_memory.h"
namespace content {
DeviceInertialSensorService::DeviceInertialSensorService()
: num_light_readers_(0),
num_motion_readers_(0),
num_orientation_readers_(0),
is_shutdown_(false) {
}
DeviceInertialSensorService::~DeviceInertialSensorService() {
}
DeviceInertialSensorService* DeviceInertialSensorService::GetInstance() {
return Singleton<DeviceInertialSensorService,
LeakySingletonTraits<DeviceInertialSensorService> >::get();
}
void DeviceInertialSensorService::AddConsumer(ConsumerType consumer_type) {
if (!ChangeNumberConsumers(consumer_type, 1))
return;
DCHECK(GetNumberConsumers(consumer_type));
if (!data_fetcher_)
data_fetcher_.reset(new DataFetcherSharedMemory);
data_fetcher_->StartFetchingDeviceData(consumer_type);
}
void DeviceInertialSensorService::RemoveConsumer(ConsumerType consumer_type) {
if (!ChangeNumberConsumers(consumer_type, -1))
return;
if (GetNumberConsumers(consumer_type) == 0)
data_fetcher_->StopFetchingDeviceData(consumer_type);
}
bool DeviceInertialSensorService::ChangeNumberConsumers(
ConsumerType consumer_type, int delta) {
DCHECK(thread_checker_.CalledOnValidThread());
if (is_shutdown_)
return false;
switch (consumer_type) {
case CONSUMER_TYPE_MOTION:
num_motion_readers_ += delta;
DCHECK_GE(num_motion_readers_, 0);
return true;
case CONSUMER_TYPE_ORIENTATION:
num_orientation_readers_ += delta;
DCHECK_GE(num_orientation_readers_ , 0);
return true;
case CONSUMER_TYPE_LIGHT:
num_light_readers_ += delta;
DCHECK_GE(num_light_readers_, 0);
return true;
default:
NOTREACHED();
}
return false;
}
int DeviceInertialSensorService::GetNumberConsumers(
ConsumerType consumer_type) const {
switch (consumer_type) {
case CONSUMER_TYPE_MOTION:
return num_motion_readers_;
case CONSUMER_TYPE_ORIENTATION:
return num_orientation_readers_;
case CONSUMER_TYPE_LIGHT:
return num_light_readers_;
default:
NOTREACHED();
}
return 0;
}
base::SharedMemoryHandle
DeviceInertialSensorService::GetSharedMemoryHandleForProcess(
ConsumerType consumer_type, base::ProcessHandle handle) {
DCHECK(thread_checker_.CalledOnValidThread());
return data_fetcher_->GetSharedMemoryHandleForProcess(consumer_type, handle);
}
void DeviceInertialSensorService::Shutdown() {
if (data_fetcher_) {
data_fetcher_->StopFetchingAllDeviceData();
data_fetcher_.reset();
}
is_shutdown_ = true;
}
void DeviceInertialSensorService::SetDataFetcherForTesting(
DataFetcherSharedMemory* test_data_fetcher) {
if (data_fetcher_)
data_fetcher_->StopFetchingAllDeviceData();
data_fetcher_.reset(test_data_fetcher);
}
} // namespace content
|
