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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef INCLUDED_BASEGFX_SYSTEMDEPENDENTDATA_HXX
#define INCLUDED_BASEGFX_SYSTEMDEPENDENTDATA_HXX
#include <sal/types.h>
#include <basegfx/basegfxdllapi.h>
#include <memory>
#include <map>
#include <set>
namespace basegfx
{
class SystemDependentData;
typedef std::shared_ptr<SystemDependentData> SystemDependentData_SharedPtr;
typedef std::weak_ptr<SystemDependentData> SystemDependentData_WeakPtr;
} // end of namespace basegfx
namespace basegfx
{
class BASEGFX_DLLPUBLIC SystemDependentDataManager
{
private:
// noncopyable
SystemDependentDataManager(const SystemDependentDataManager&) = delete;
SystemDependentDataManager& operator=(const SystemDependentDataManager&) = delete;
public:
SystemDependentDataManager();
virtual ~SystemDependentDataManager();
// call from (and with) SystemDependentData objects when start/end/touch
// usage is needed
virtual void startUsage(basegfx::SystemDependentData_SharedPtr& rData) = 0;
virtual void endUsage(basegfx::SystemDependentData_SharedPtr& rData) = 0;
virtual void touchUsage(basegfx::SystemDependentData_SharedPtr& rData) = 0;
// flush all buffered data (e.g. cleanup/shutdown)
virtual void flushAll() = 0;
};
} // end of namespace basegfx
namespace basegfx
{
class BASEGFX_DLLPUBLIC MinimalSystemDependentDataManager : public SystemDependentDataManager
{
private:
// example of a minimal SystemDependentDataManager. It *needs to hold*
// a SystemDependentData_SharedPtr while SystemDependentDataHolder's will
// use a SystemDependentData_WeakPtr. When the held SystemDependentData_SharedPtr
// is deleted, the corresponding SystemDependentData_WeakPtr will get void.
// To make this work, a minimal SystemDependentDataManager *has* to hold at
// least that one SystemDependentData_SharedPtr.
// That SystemDependentData_SharedPtr may be (e.g. Timer-based or resource-based)
// be freed then. This minimal implementation does never free it, so all stay valid.
// The instances may still be removed by endUsage calls, but there is no
// caching/buffering mechanism involved here at all. It's an example, but
// not used - better use an advanced derivation of SystemDependentDataManager
std::set< SystemDependentData_SharedPtr > maSystemDependentDataReferences;
public:
MinimalSystemDependentDataManager();
virtual ~MinimalSystemDependentDataManager() override;
virtual void startUsage(basegfx::SystemDependentData_SharedPtr& rData) override;
virtual void endUsage(basegfx::SystemDependentData_SharedPtr& rData) override;
virtual void touchUsage(basegfx::SystemDependentData_SharedPtr& rData) override;
virtual void flushAll() override;
};
} // end of namespace basegfx
namespace basegfx
{
class BASEGFX_DLLPUBLIC SystemDependentData
{
private:
// noncopyable
SystemDependentData(const SystemDependentData&) = delete;
SystemDependentData& operator=(const SystemDependentData&) = delete;
// reference to a SystemDependentDataManager, probably
// a single, globally used one, but not necessarily
SystemDependentDataManager& mrSystemDependentDataManager;
// Buffered CalculatedCycles, result of estimations using
// getHoldCyclesInSeconds and estimateUsageInBytes, executed
// using getHoldCyclesInSeconds. StartValue is 0 to detect
// not-yet-calculated state
sal_uInt32 mnCalculatedCycles;
public:
SystemDependentData(
SystemDependentDataManager& rSystemDependentDataManager);
// CAUTION! It is VERY important to keep this base class
// virtual, else typeid(class).hash_code() from derived classes
// will NOT work what is ESSENTIAL for the SystemDependentData
// mechanism to work properly. So DO NOT REMOVE virtual here, please.
virtual ~SystemDependentData();
// allow access to call startUsage/endUsage/touchUsage
// using getSystemDependentDataManager()
SystemDependentDataManager& getSystemDependentDataManager() { return mrSystemDependentDataManager; }
// Calculate HoldCyclesInSeconds based on using
// getHoldCyclesInSeconds and estimateUsageInBytes, the
// result is created once on-demand and buffered in
// mnCalculatedCycles
sal_uInt32 calculateCombinedHoldCyclesInSeconds() const;
// Size estimation of the entry in bytes - does not have to
// be used, but should be. Default returns zero what
// means there is no size estimation available. Override to
// offer useful data if you want to have better caching.
virtual sal_Int64 estimateUsageInBytes() const;
};
} // end of namespace basegfx
namespace basegfx
{
class BASEGFX_DLLPUBLIC SystemDependentDataHolder
{
private:
// Possibility to hold System-Dependent B2DPolygon-Representations
std::map< size_t, SystemDependentData_WeakPtr > maSystemDependentReferences;
// noncopyable
SystemDependentDataHolder(const SystemDependentDataHolder&) = delete;
SystemDependentDataHolder& operator=(const SystemDependentDataHolder&) = delete;
public:
SystemDependentDataHolder();
virtual ~SystemDependentDataHolder();
void addOrReplaceSystemDependentData(SystemDependentData_SharedPtr& rData);
SystemDependentData_SharedPtr getSystemDependentData(size_t hash_code) const;
};
} // end of namespace basegfx
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
