LOCAL_CACHE_TEMPLATE
typename LOCAL_CACHE_CLASS::result
LOCAL_CACHE_CLASS::get(const KeyT& key, ValueT& value)
{
// lock
if (capacity < 1) {
return MISS;
}
tbsys::CThreadGuard guard(&mutex);
entry_cache_iterator iter = cache.find(&key);
if (iter == cache.end()) {
return MISS;
}
// adjust lru list
lru.splice(lru.begin(), lru, iter->second);
// whatever, find entry, fill value
fill_value(iter, value);
// check whether entry was expired
uint64_t now = tbutil::Time::now().toMilliSeconds();
assert(expire != 0);
if (now - entry_utime(iter) > expire) {
// expired
set_entry_utime(iter->second, now);
return EXPIRED;
} else {
// fresh entry
return HIT;
}
}
LOCAL_CACHE_TEMPLATE
typename LOCAL_CACHE_CLASS::result
LOCAL_CACHE_CLASS::put_if_absent(const KeyT &key, const ValueT &val, ValueT &curtVal) {
if (capacity < 1) {
return MISS;
}
result res = MISS;
// lock
tbsys::CThreadGuard guard(&mutex);
entry_cache_iterator iter = cache.find(&key);
internal_entry *entry = NULL;
if (iter == cache.end()) {
res = MISS;
// not found
// evict entry
while (cache.size() >= capacity) {
assert(capacity >= 1);
const internal_entry *evict = evict_one();
assert(evict != NULL);
// free entry
drop_entry(evict);
}
// insert new one
// allocate internal_entry, relase after evict or in clear()
entry = make_entry(key, val);
if (entry == NULL) {
return SETERROR;
}
lru.push_front(entry);
cache[entry->get_key()] = lru.begin();
curtVal = val;
} else {
res = HIT;
// found, already exists
// adjust lru list
lru.splice(lru.begin(), lru, iter->second);
// update entry value and utime
// update first, some meta info
fill_value(iter, curtVal);
uint64_t now = tbutil::Time::now().toMilliSeconds();
assert(expire != 0);
if (now - entry_utime(iter) > expire) {
// expired
set_entry_utime(iter->second, now);
res = EXPIRED;
}
}
return res;
}