3 * Copyright (C) 2008 The Geeqie Team
5 * Author: Vladimir Nadvornik
7 * This software is released under the GNU General Public License (GNU GPL).
8 * Please read the included file COPYING for more information.
9 * This software comes with no warranty of any kind, use at your own risk!
14 #include "filecache.h"
16 /* Set to TRUE to add file cache dumps to the debug output */
17 const gboolean debug_file_cache = FALSE;
19 /* this implements a simple LRU algorithm */
21 struct _FileCacheData {
22 FileCacheReleaseFunc release;
28 typedef struct _FileCacheEntry FileCacheEntry;
29 struct _FileCacheEntry {
34 FileCacheData *file_cache_new(FileCacheReleaseFunc release, gulong max_size)
36 FileCacheData *fc = g_new(FileCacheData, 1);
37 fc->release = release;
39 fc->max_size = max_size;
44 gboolean file_cache_get(FileCacheData *fc, FileData *fd)
53 FileCacheEntry *fce = work->data;
57 DEBUG_1("cache hit: fc=%p %s", fc, fd->path);
58 if (work == fc->list) return TRUE; /* already at the beginning */
59 /* move it to the beginning */
60 DEBUG_1("cache move to front: fc=%p %s", fc, fd->path);
61 fc->list = g_list_remove_link(fc->list, work);
62 fc->list = g_list_concat(work, fc->list);
63 if (debug_file_cache) file_cache_dump(fc);
68 DEBUG_1("cache miss: fc=%p %s", fc, fd->path);
72 void file_cache_set_size(FileCacheData *fc, gulong size)
75 FileCacheEntry *last_fe;
77 if (debug_file_cache) file_cache_dump(fc);
79 work = g_list_last(fc->list);
80 while (fc->size > size && work)
85 fc->list = g_list_delete_link(fc->list, work);
88 DEBUG_1("cache remove: fc=%p %s", fc, last_fe->fd->path);
89 fc->size -= last_fe->size;
90 fc->release(last_fe->fd);
91 file_data_unref(last_fe->fd);
96 void file_cache_put(FileCacheData *fc, FileData *fd, gulong size)
100 if (file_cache_get(fc, fd)) return;
102 DEBUG_1("cache add: fc=%p %s", fc, fd->path);
103 fe = g_new(FileCacheEntry, 1);
104 fe->fd = file_data_ref(fd);
106 fc->list = g_list_prepend(fc->list, fe);
109 file_cache_set_size(fc, fc->max_size);
112 gulong file_cache_get_max_size(FileCacheData *fc)
117 gulong file_cache_get_size(FileCacheData *fc)
122 void file_cache_set_max_size(FileCacheData *fc, gulong size)
125 file_cache_set_size(fc, fc->max_size);
128 void file_cache_dump(FileCacheData *fc)
133 DEBUG_1("cache dump: fc=%p max size:%ld size:%ld", fc, fc->max_size, fc->size);
137 FileCacheEntry *fe = work->data;
139 DEBUG_1("cache entry: fc=%p [%lu] %s %ld", fc, ++n, fe->fd->path, fe->size);