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1 // Copyright 2013 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 #ifndef CONTENT_BROWSER_GEOLOCATION_WIFI_POLLING_POLICY_H_ | |
6 #define CONTENT_BROWSER_GEOLOCATION_WIFI_POLLING_POLICY_H_ | |
7 | |
8 #include "base/macros.h" | |
9 | |
10 namespace content { | |
11 | |
12 // Allows sharing and mocking of the update polling policy function. | |
13 class WifiPollingPolicy { | |
14 public: | |
15 WifiPollingPolicy() {} | |
16 virtual ~WifiPollingPolicy() {} | |
17 // Calculates the new polling interval for wiFi scans, given the previous | |
18 // interval and whether the last scan produced new results. | |
19 virtual void UpdatePollingInterval(bool scan_results_differ) = 0; | |
20 virtual int PollingInterval() = 0; | |
21 virtual int NoWifiInterval() = 0; | |
22 | |
23 private: | |
24 DISALLOW_COPY_AND_ASSIGN(WifiPollingPolicy); | |
25 }; | |
26 | |
27 // Generic polling policy, constants are compile-time parameterized to allow | |
28 // tuning on a per-platform basis. | |
29 template<int DEFAULT_INTERVAL, | |
30 int NO_CHANGE_INTERVAL, | |
31 int TWO_NO_CHANGE_INTERVAL, | |
32 int NO_WIFI_INTERVAL> | |
33 class GenericWifiPollingPolicy : public WifiPollingPolicy { | |
34 public: | |
35 GenericWifiPollingPolicy() : polling_interval_(DEFAULT_INTERVAL) {} | |
36 // WifiPollingPolicy | |
37 void UpdatePollingInterval(bool scan_results_differ) override { | |
38 if (scan_results_differ) { | |
39 polling_interval_ = DEFAULT_INTERVAL; | |
40 } else if (polling_interval_ == DEFAULT_INTERVAL) { | |
41 polling_interval_ = NO_CHANGE_INTERVAL; | |
42 } else { | |
43 DCHECK(polling_interval_ == NO_CHANGE_INTERVAL || | |
44 polling_interval_ == TWO_NO_CHANGE_INTERVAL); | |
45 polling_interval_ = TWO_NO_CHANGE_INTERVAL; | |
46 } | |
47 } | |
48 int PollingInterval() override { return polling_interval_; } | |
49 int NoWifiInterval() override { return NO_WIFI_INTERVAL; } | |
50 | |
51 private: | |
52 int polling_interval_; | |
53 }; | |
54 | |
55 } // namespace content | |
56 | |
57 #endif // CONTENT_BROWSER_GEOLOCATION_WIFI_POLLING_POLICY_H_ | |
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