int dict_cache_delete(DICT_CACHE *cp, const char *cache_key)
{
const char *myname = "dict_cache_delete";
int del_res;
DICT *db = cp->db;
/*
* Delete the entry, unless we would delete the current first/next entry.
* In that case, schedule the "current" entry for delete-behind to avoid
* mis-behavior by some databases.
*/
if (DC_MATCH_SAVED_CURRENT_KEY(cp, cache_key)) {
DC_SCHEDULE_FOR_DELETE_BEHIND(cp);
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: key=%s (current entry - schedule for delete-behind)",
myname, cache_key);
DICT_ERR_VAL_RETURN(cp, DICT_ERR_NONE, DICT_STAT_SUCCESS);
} else {
del_res = dict_del(db, cache_key);
if (del_res != 0)
msg_rate_delay(&cp->del_log_stamp, cp->log_delay, msg_warn,
"%s: could not delete entry for %s", cp->name, cache_key);
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: key=%s (%s)", myname, cache_key,
del_res == 0 ? "found" :
db->error ? "error" : "not found");
DICT_ERR_VAL_RETURN(cp, db->error, del_res);
}
}
const char *dict_cache_lookup(DICT_CACHE *cp, const char *cache_key)
{
const char *myname = "dict_cache_lookup";
const char *cache_val;
DICT *db = cp->db;
/*
* Search for the cache entry. Don't return an entry that is scheduled
* for delete-behind.
*/
if (DC_IS_SCHEDULED_FOR_DELETE_BEHIND(cp)
&& DC_MATCH_SAVED_CURRENT_KEY(cp, cache_key)) {
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: key=%s (pretend not found - scheduled for deletion)",
myname, cache_key);
DICT_ERR_VAL_RETURN(cp, DICT_ERR_NONE, (char *) 0);
} else {
cache_val = dict_get(db, cache_key);
if (cache_val == 0 && db->error != 0)
msg_rate_delay(&cp->get_log_stamp, cp->log_delay, msg_warn,
"%s: cache lookup for '%s' failed due to error",
cp->name, cache_key);
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: key=%s value=%s", myname, cache_key,
cache_val ? cache_val : db->error ?
"error" : "(not found)");
DICT_ERR_VAL_RETURN(cp, db->error, cache_val);
}
}
void dict_cache_update(DICT_CACHE *cp, const char *cache_key,
const char *cache_val)
{
const char *myname = "dict_cache_update";
/*
* Store the cache entry and cancel the delete-behind operation.
*/
if (DC_IS_SCHEDULED_FOR_DELETE_BEHIND(cp)
&& DC_MATCH_SAVED_CURRENT_KEY(cp, cache_key)) {
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: cancel delete-behind for key=%s", myname, cache_key);
DC_CANCEL_DELETE_BEHIND(cp);
}
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: key=%s value=%s", myname, cache_key, cache_val);
dict_put(cp->db, cache_key, cache_val);
}
const char *dict_cache_lookup(DICT_CACHE *cp, const char *cache_key)
{
const char *myname = "dict_cache_lookup";
const char *cache_val;
/*
* Search for the cache entry. Don't return an entry that is scheduled
* for delete-behind.
*/
if (DC_IS_SCHEDULED_FOR_DELETE_BEHIND(cp)
&& DC_MATCH_SAVED_CURRENT_KEY(cp, cache_key)) {
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: key=%s (pretend not found - scheduled for deletion)",
myname, cache_key);
return (0);
} else {
cache_val = dict_get(cp->db, cache_key);
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: key=%s value=%s", myname, cache_key,
cache_val ? cache_val : "(not found)");
return (cache_val);
}
}
int dict_cache_update(DICT_CACHE *cp, const char *cache_key,
const char *cache_val)
{
const char *myname = "dict_cache_update";
DICT *db = cp->db;
int put_res;
/*
* Store the cache entry and cancel the delete-behind operation.
*/
if (DC_IS_SCHEDULED_FOR_DELETE_BEHIND(cp)
&& DC_MATCH_SAVED_CURRENT_KEY(cp, cache_key)) {
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: cancel delete-behind for key=%s", myname, cache_key);
DC_CANCEL_DELETE_BEHIND(cp);
}
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: key=%s value=%s", myname, cache_key, cache_val);
put_res = dict_put(db, cache_key, cache_val);
if (put_res != 0)
msg_rate_delay(&cp->upd_log_stamp, cp->log_delay, msg_warn,
"%s: could not update entry for %s", cp->name, cache_key);
DICT_ERR_VAL_RETURN(cp, db->error, put_res);
}
int dict_cache_delete(DICT_CACHE *cp, const char *cache_key)
{
const char *myname = "dict_cache_delete";
int zero_means_found;
/*
* Delete the entry, unless we would delete the current first/next entry.
* In that case, schedule the "current" entry for delete-behind to avoid
* mis-behavior by some databases.
*/
if (DC_MATCH_SAVED_CURRENT_KEY(cp, cache_key)) {
DC_SCHEDULE_FOR_DELETE_BEHIND(cp);
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: key=%s (current entry - schedule for delete-behind)",
myname, cache_key);
zero_means_found = 0;
} else {
zero_means_found = dict_del(cp->db, cache_key);
if (cp->user_flags & DICT_CACHE_FLAG_VERBOSE)
msg_info("%s: key=%s (%s)", myname, cache_key,
zero_means_found == 0 ? "found" : "not found");
}
return (zero_means_found);
}
