+
+ function stream($fn, $args, $cachekey, $offset=0, $limit=20, $since_id=0, $max_id=0, $since=null)
+ {
+ $cache = common_memcache();
+
+ if (empty($cache) ||
+ $since_id != 0 || $max_id != 0 || (!is_null($since) && $since > 0) ||
+ ($offset + $limit) > NOTICE_CACHE_WINDOW) {
+ return call_user_func_array($fn, array_merge($args, array($offset, $limit, $since_id,
+ $max_id, $since)));
+ }
+
+ $idkey = common_cache_key($cachekey);
+
+ $idstr = $cache->get($idkey);
+
+ if (!empty($idstr)) {
+ // Cache hit! Woohoo!
+ $window = explode(',', $idstr);
+ $ids = array_slice($window, $offset, $limit);
+ return $ids;
+ }
+
+ $laststr = $cache->get($idkey.';last');
+
+ if (!empty($laststr)) {
+ $window = explode(',', $laststr);
+ $last_id = $window[0];
+ $new_ids = call_user_func_array($fn, array_merge($args, array(0, NOTICE_CACHE_WINDOW,
+ $last_id, 0, null, $tag)));
+
+ $new_window = array_merge($new_ids, $window);
+
+ $new_windowstr = implode(',', $new_window);
+
+ $result = $cache->set($idkey, $new_windowstr);
+ $result = $cache->set($idkey . ';last', $new_windowstr);
+
+ $ids = array_slice($new_window, $offset, $limit);
+
+ return $ids;
+ }
+
+ $window = call_user_func_array($fn, array_merge($args, array(0, NOTICE_CACHE_WINDOW,
+ 0, 0, null, $tag)));
+
+ $windowstr = implode(',', $window);
+
+ $result = $cache->set($idkey, $windowstr);
+ $result = $cache->set($idkey . ';last', $windowstr);
+
+ $ids = array_slice($window, $offset, $limit);
+
+ return $ids;
+ }