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cache_global.hpp
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1/*********************************************************************/
2// dar - disk archive - a backup/restoration program
3// Copyright (C) 2002-2026 Denis Corbin
4//
5// This program is free software; you can redistribute it and/or
6// modify it under the terms of the GNU General Public License
7// as published by the Free Software Foundation; either version 2
8// of the License, or (at your option) any later version.
9//
10// This program is distributed in the hope that it will be useful,
11// but WITHOUT ANY WARRANTY; without even the implied warranty of
12// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13// GNU General Public License for more details.
14//
15// You should have received a copy of the GNU General Public License
16// along with this program; if not, write to the Free Software
17// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18//
19// to contact the author, see the AUTHOR file
20/*********************************************************************/
21
25
26#ifndef CACHE_GLOBAL_HPP
27#define CACHE_GLOBAL_HPP
28
29#include "../my_config.h"
30#include "cache.hpp"
31#include "fichier_global.hpp"
32
33 namespace libdar
34{
35
38
40
41 class cache_global: public fichier_global
42 {
43 public:
44 static const U_I default_cache_size = 102400;
45
47
54 cache_global(const std::shared_ptr<user_interaction> & dialog, fichier_global *x_ptr, bool shift_mode, U_I size = default_cache_size);
55
57 cache_global(cache_global & ref) = delete;
58
60 cache_global(cache_global && ref) = delete;
61
63 cache_global & operator = (const cache_global & ref) = delete;
64
66 cache_global & operator = (cache_global && ref) = delete;
67
69 ~cache_global() { detruit(); };
70
71 // inherited from fichier_global
72
73 virtual void change_ownership(const std::string & user, const std::string & group) override { ptr->change_ownership(user, group); };
74 virtual void change_permission(U_I perm) override { ptr->change_permission(perm); };
75 virtual infinint get_size() const override { return ptr->get_size(); };
76 virtual void fadvise(advise adv) const override { ptr->fadvise(adv); };
77
78
79 // inherited from generic_file grand-parent class
80
81 virtual bool skippable(skippability direction, const infinint & amount) override { return buffer->skippable(direction, amount); };
82 virtual bool skip(const infinint & pos) override { return buffer->skip(pos); };
83 virtual bool skip_to_eof() override { return buffer->skip_to_eof(); };
84 virtual bool skip_relative(S_I x) override { return buffer->skip_relative(x); };
85 virtual bool truncatable(const infinint & pos) const override { return buffer->truncatable(pos); };
86 virtual infinint get_position() const override { return buffer->get_position(); };
87
88 // expose cache specific methods
89
90 void change_to_read_write() { buffer->change_to_read_write(); };
91
92 protected:
93
94 // inherited from fichier_global
95
96 virtual U_I fichier_global_inherited_write(const char *a, U_I size) override { buffer->write(a, size); return size; };
97 virtual bool fichier_global_inherited_read(char *a, U_I size, U_I & read, std::string & message) override { read = buffer->read(a, size); return true; };
98
99 // inherted from generic_file
100 virtual void inherited_read_ahead(const infinint & amount) override { buffer->read_ahead(amount); };
101 virtual void inherited_truncate(const infinint & pos) override { buffer->truncate(pos); };
102 virtual void inherited_sync_write() override { buffer->sync_write(); ptr->sync_write(); };
103 virtual void inherited_flush_read() override { buffer->flush_read(); };
104 virtual void inherited_terminate() override { buffer->terminate(); ptr->terminate(); };
105
106
107 private:
108 cache* buffer;
109 fichier_global* ptr;
110
111 void detruit();
112 };
113
115
116} // end of namespace
117
118#endif
119
cache.hpp
contains the cache class
libdar::cache_global::inherited_read_ahead
virtual void inherited_read_ahead(const infinint &amount) override
tells the object that several calls to read() will follow to probably obtain at least the given amoun...
Definition cache_global.hpp:100
libdar::cache_global::inherited_truncate
virtual void inherited_truncate(const infinint &pos) override
truncate file at the give offset
Definition cache_global.hpp:101
libdar::cache_global::skip_to_eof
virtual bool skip_to_eof() override
skip to the end of file
Definition cache_global.hpp:83
libdar::cache_global::cache_global
cache_global(cache_global &&ref)=delete
move constructor
libdar::cache_global::fadvise
virtual void fadvise(advise adv) const override
set posix_fadvise for the whole file
Definition cache_global.hpp:76
libdar::cache_global::change_permission
virtual void change_permission(U_I perm) override
change the permission of the file
Definition cache_global.hpp:74
libdar::cache_global::inherited_sync_write
virtual void inherited_sync_write() override
write down any pending data
Definition cache_global.hpp:102
libdar::cache_global::cache_global
cache_global(const std::shared_ptr< user_interaction > &dialog, fichier_global *x_ptr, bool shift_mode, U_I size=default_cache_size)
constructor
libdar::cache_global::cache_global
cache_global(cache_global &ref)=delete
copy constructor
libdar::cache_global::change_ownership
virtual void change_ownership(const std::string &user, const std::string &group) override
set the ownership of the file
Definition cache_global.hpp:73
libdar::cache_global::skip
virtual bool skip(const infinint &pos) override
skip at the absolute position
Definition cache_global.hpp:82
libdar::cache_global::operator=
cache_global & operator=(const cache_global &ref)=delete
assignment operator
libdar::cache_global::get_position
virtual infinint get_position() const override
get the current read/write position
Definition cache_global.hpp:86
libdar::cache_global::fichier_global_inherited_read
virtual bool fichier_global_inherited_read(char *a, U_I size, U_I &read, std::string &message) override
replaces generic_file::inherited_read() method, to allow the return of partial reading
Definition cache_global.hpp:97
libdar::cache_global::inherited_flush_read
virtual void inherited_flush_read() override
reset internal engine, flush caches in order to read the data at current position
Definition cache_global.hpp:103
libdar::cache_global::fichier_global_inherited_write
virtual U_I fichier_global_inherited_write(const char *a, U_I size) override
replaces generic_file::inherited_write() method, to allow the return of partial writings
Definition cache_global.hpp:96
libdar::cache_global::skip_relative
virtual bool skip_relative(S_I x) override
skip relatively to the current position
Definition cache_global.hpp:84
libdar::cache_global::get_size
virtual infinint get_size() const override
return the size of the file
Definition cache_global.hpp:75
libdar::cache_global::truncatable
virtual bool truncatable(const infinint &pos) const override
whether the implementation is able to truncate to the given position
Definition cache_global.hpp:85
libdar::cache_global::inherited_terminate
virtual void inherited_terminate() override
destructor-like call, except that it is allowed to throw exceptions
Definition cache_global.hpp:104
libdar::cache_global::~cache_global
~cache_global()
destructor
Definition cache_global.hpp:69
libdar::cache_global::skippable
virtual bool skippable(skippability direction, const infinint &amount) override
whether the implementation is able to skip
Definition cache_global.hpp:81
libdar::cache
the cache class implements a fixed length read/write caching mechanism
Definition cache.hpp:53
libdar::fichier_global
abstraction of filesystem files for entrepot
Definition fichier_global.hpp:59
libdar::fichier_global::advise
advise
Definition fichier_global.hpp:62
libdar::fichier_global::fichier_global
fichier_global(const std::shared_ptr< user_interaction > &dialog, gf_mode mode)
constructor
Definition fichier_global.hpp:76
libdar::generic_file::read
virtual U_I read(char *a, U_I size) override
read data from the generic_file inherited from proto_generic_file
libdar::infinint
the arbitrary large positive integer class
Definition real_infinint.hpp:62
fichier_global.hpp
class fichier_global definition. This class is a pure virtual class class fichier_global is an abstra...
my_config.h
include macro defined by the configure script and some specific additional ones
libdar
libdar namespace encapsulate all libdar symbols
Definition archive.hpp:47