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 /* this implements a simple LRU algorithm */
18 struct _FileCacheData {
19 FileCacheReleaseFunc release;
25 typedef struct _FileCacheEntry FileCacheEntry;
26 struct _FileCacheEntry {
31 static gint file_cache_entry_compare_cb(gconstpointer a, gconstpointer b)
33 const FileCacheEntry *fca = a;
34 const FileData *fd = b;
35 if (fca->fd == fd) return 0;
40 FileCacheData *file_cache_new(FileCacheReleaseFunc release, gulong max_size)
42 FileCacheData *fc = g_new(FileCacheData, 1);
43 fc->release = release;
45 fc->max_size = max_size;
50 gint file_cache_get(FileCacheData *fc, FileData *fd)
54 work = g_list_find_custom(fc->list, fd, file_cache_entry_compare_cb);
57 fc->list = g_list_remove_link(fc->list, work);
58 fc->list = g_list_concat(work, fc->list);
59 DEBUG_1("cache hit: %s", fd->path);
62 DEBUG_1("cache miss: %s", fd->path);
66 void file_cache_set_size(FileCacheData *fc, gulong size)
69 FileCacheEntry *last_fe;
70 work = g_list_last(fc->list);
71 while (fc->size > size && work)
76 fc->list = g_list_delete_link(fc->list, work);
79 DEBUG_1("cache remove: %s", last_fe->fd->path);
80 fc->size -= last_fe->size;
81 fc->release(last_fe->fd);
82 file_data_unref(last_fe->fd);
87 void file_cache_put(FileCacheData *fc, FileData *fd, gulong size)
92 work = g_list_find_custom(fc->list, fd, file_cache_entry_compare_cb);
95 /* entry already exists, move it to the beginning */
96 fc->list = g_list_remove_link(fc->list, work);
97 fc->list = g_list_concat(work, fc->list);
101 DEBUG_1("cache add: %s", fd->path);
102 fe = g_new(FileCacheEntry, 1);
103 fe->fd = file_data_ref(fd);
105 fc->list = g_list_prepend(fc->list, fe);
108 file_cache_set_size(fc, fc->max_size);
111 gulong file_cache_get_max_size(FileCacheData *fc)
116 gulong file_cache_get_size(FileCacheData *fc)
121 void file_cache_set_max_size(FileCacheData *fc, gulong size)
124 file_cache_set_size(fc, fc->max_size);
127 void file_cache_dump(FileCacheData *fc)
132 DEBUG_1("cache dump: max size:%ld size:%ld", fc->max_size, fc->size);
136 FileCacheEntry *fe = work->data;
138 DEBUG_1("cache entry: %s %ld", fe->fd->path, fe->size);