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
|
/*
* Copyright 2010, The Android Open Source Project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef GeolocationPositionCache_h
#define GeolocationPositionCache_h
#include "PlatformString.h"
#include "ScriptExecutionContext.h"
#include <wtf/Forward.h>
#include <wtf/MessageQueue.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class Geoposition;
// Maintains a cached position for Geolocation. Takes care of writing and
// reading the position to a database on a background thread. The Geolocation
// spec does not require a cached position to be maintained, so we take a
// best-effort approach where we do not wait for database reads or writes.
class GeolocationPositionCache {
public:
static GeolocationPositionCache* instance();
void addUser();
void removeUser();
void setDatabasePath(const String&);
void setCachedPosition(Geoposition*);
Geoposition* cachedPosition();
private:
GeolocationPositionCache();
void startBackgroundThread();
static void* threadEntryPoint(void* object);
void threadEntryPointImpl();
void triggerReadFromDatabase();
static void readFromDatabase(ScriptExecutionContext*, GeolocationPositionCache*);
void readFromDatabaseImpl();
void triggerWriteToDatabase();
static void writeToDatabase(ScriptExecutionContext*, GeolocationPositionCache*);
void writeToDatabaseImpl();
RefPtr<Geoposition> m_cachedPosition;
Mutex m_cachedPositionMutex;
ThreadIdentifier m_threadId;
MessageQueue<ScriptExecutionContext::Task> m_queue;
String m_databaseFile;
Mutex m_databaseFileMutex;
};
} // namespace WebCore
#endif // GeolocationPositionCache_h
|