diff options
Diffstat (limited to 'libibex')
| -rw-r--r-- | libibex/ChangeLog | 14 | ||||
| -rw-r--r-- | libibex/wordindex.h | 2 | ||||
| -rw-r--r-- | libibex/wordindexmem.c | 61 |
3 files changed, 76 insertions, 1 deletions
diff --git a/libibex/ChangeLog b/libibex/ChangeLog index f4ed9f5f28..de9cb8dd40 100644 --- a/libibex/ChangeLog +++ b/libibex/ChangeLog @@ -1,3 +1,17 @@ +2000-11-16 Not Zed <NotZed@HelixCode.com> + + * wordindexmem.c (ibex_create_word_index_mem): Initialise nameinit + & namecache. + (contains_name): On first call, load all names into memory. We + usually do a whole lot of lookups in a row, and this saves a lot + of penalties on a big list, for not too much a memory hit. + (find_name): If we have the namelist in memory do a quick + short-circuit check to see if we have to do further processing. + (unindex_name): Cross check the namecache, if it is active. + Remove it there too/or exit (no work to do). + (word_flush): If we have the namecache active, destroy it now, as + it is not needed anymore (for now). + 2000-10-30 Kjartan Maraas <kmaraas@gnome.org> * hash.c: #include <stdlib.h> to remove warning. diff --git a/libibex/wordindex.h b/libibex/wordindex.h index 353f4dddc6..3a60accb70 100644 --- a/libibex/wordindex.h +++ b/libibex/wordindex.h @@ -61,6 +61,8 @@ struct _IBEXWord { struct _list wordnodes; /* LRU list of wordcache structures */ int wordcount; /* how much space used in cache */ int precount; + GHashTable *namecache; /* a list of names (only), cached for quick reference */ + int nameinit; }; diff --git a/libibex/wordindexmem.c b/libibex/wordindexmem.c index f0cc7336f8..4c0bca7cef 100644 --- a/libibex/wordindexmem.c +++ b/libibex/wordindexmem.c @@ -136,6 +136,8 @@ ibex_create_word_index_mem(struct _memcache *bc, blockid_t *wordroot, blockid_t ibex_list_new(&idx->wordnodes); idx->wordcount = 0; idx->precount = 0; + idx->namecache = g_hash_table_new(g_str_hash, g_str_equal); + idx->nameinit = 0; idx->klass = &ibex_word_index_mem_class; /* we use the same block array storage for both indexes at the moment */ @@ -271,6 +273,19 @@ static void unindex_name(struct _IBEXWord *idx, const char *name) d(printf("unindexing %s\n", name)); + /* if we have a namecache, check that to see if we need to remove that item, or there is no work here */ + if (idx->nameinit) { + char *oldkey; + gboolean oldval; + + if (g_hash_table_lookup_extended(idx->namecache, name, (void *)&oldkey, (void *)&oldval)) { + g_hash_table_remove(idx->namecache, oldkey); + g_free(oldkey); + } else { + return; + } + } + /* lookup the hash key */ nameid = idx->nameindex->klass->find(idx->nameindex, name, strlen(name)); /* get the block for this key */ @@ -330,7 +345,30 @@ static void unindex_name(struct _IBEXWord *idx, const char *name) /* index contains (any) data for name */ static gboolean contains_name(struct _IBEXWord *idx, const char *name) { - return idx->nameindex->klass->find(idx->nameindex, name, strlen(name)) != 0; + struct _IBEXCursor *idc; + nameid_t wordid; + char *key; + int len; + + /* load all the names into memory, since we're *usually* about to do a lot of these */ + + /* Note that because of the (poor) hash algorithm, this is >> faster than + looking up every key in turn. Basically because all keys are stored packed + in the same list, not in buckets of keys for the same hash (among other reasons) */ + + if (!idx->nameinit) { + printf("pre-loading all name info into memory\n"); + idc = idx->nameindex->klass->get_cursor(idx->nameindex); + while ( (wordid = idc->klass->next(idc)) ) { + key = idc->index->klass->get_key(idc->index, wordid, &len); + g_hash_table_insert(idx->namecache, key, (void *)TRUE); + } + idc->klass->close(idc); + idx->nameinit = TRUE; + } + + return (gboolean)g_hash_table_lookup(idx->namecache, name); + /*return idx->nameindex->klass->find(idx->nameindex, name, strlen(name)) != 0;*/ } /* returns all matches for word */ @@ -391,6 +429,10 @@ static gboolean find_name(struct _IBEXWord *idx, const char *name, const char *w struct _wordcache *cache; int i; + /* if we have the namelist in memory, quick-check that */ + if (idx->nameinit && g_hash_table_lookup(idx->namecache, name) == NULL) + return FALSE; + /* lookup the hash key for the name */ nameid = idx->nameindex->klass->find(idx->nameindex, name, strlen(name)); /* get the block for this name */ @@ -607,6 +649,10 @@ static void add_list(struct _IBEXWord *idx, const char *name, GPtrArray *words) d(cache_sanity(idx)); + /* make sure we keep the namecache in sync, if it is active */ + if (idx->nameinit && g_hash_table_lookup(idx->namecache, name) == NULL) + g_hash_table_insert(idx->namecache, g_strdup(name), (void *)TRUE); + /* get the nameid and block start for this name */ add_index_key(idx->nameindex, name, &nameid, &nameblock, &nametail); @@ -694,6 +740,14 @@ word_sync(struct _IBEXWord *idx) return 0; } +static gboolean +free_key(void *key, void *value, void *data) +{ + g_free(key); + + return TRUE; +} + /* sync and flush any in-memory data to disk and free it */ static int word_flush(struct _IBEXWord *idx) @@ -702,6 +756,10 @@ word_flush(struct _IBEXWord *idx) g_hash_table_foreach_remove(idx->wordcache, sync_free_value, idx); idx->wordcount = 0; + if (idx->nameinit) { + g_hash_table_foreach_remove(idx->namecache, free_key, NULL); + idx->nameinit = FALSE; + } return 0; } @@ -715,6 +773,7 @@ static int word_close(struct _IBEXWord *idx) idx->wordstore->klass->close(idx->wordstore);*/ idx->wordindex->klass->close(idx->wordindex); g_hash_table_destroy(idx->wordcache); + g_hash_table_destroy(idx->namecache); g_free(idx); return 0; |