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<?php |
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/* zCache |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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/** |
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* Redis Cache Class |
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* |
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* @use Redis (https://github.com/nicolasff/phpredis) |
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* |
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*/ |
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class RedisCache extends AbstractCache |
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{ |
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/** |
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* Redis object instance |
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* |
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* @var object Redis object |
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*/ |
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private $_redis; |
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/** |
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* Instantiates the `Redis` object and connects it to the configured server. |
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* |
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* @return void |
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*/ |
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function __construct() |
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{ |
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global $redisServer, $redisPort; |
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if (!$this->_redis) { |
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$this->_redis = new Redis(); |
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} |
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if (substr($redisServer, 0, 7) == "unix://") { |
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$this->_redis->pconnect(substr($redisServer, 7), 0.0, null, 0); |
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} else { |
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$this->_redis->pconnect($redisServer, $redisPort, 0.0, null, 0); |
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} |
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} |
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/** |
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* Sets expiration time for cache key |
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* |
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* @param string $key The key to uniquely identify the cached item |
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* @param mixed $timeout A `strtotime()`-compatible string or a Unix timestamp. |
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* @return boolean |
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*/ |
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protected function _expireAt($key, $timeout) |
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{ |
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return $this->_redis->expireAt($key, is_int($timeout) ? $timeout : strtotime($timeout)); |
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} |
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/** |
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* Read value from the cache |
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* |
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* @param string $key The key to uniquely identify the cached item |
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* @return mixed |
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*/ |
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public function get($key) |
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{ |
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return $this->_redis->get($key); |
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} |
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/** |
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* Write value to the cache |
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* |
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* @param string $key The key to uniquely identify the cached item |
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* @param mixed $value The value to be cached |
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* @param null|string $timeout A strtotime() compatible cache time. |
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* @return boolean |
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*/ |
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public function set($key, $value, $timeout) |
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{ |
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$result = $this->_redis->set($key, $value); |
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return $result ? $this->_expireAt($key, $timeout) : $result; |
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} |
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/** |
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* Override value in the cache |
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* |
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* @param string $key The key to uniquely identify the cached item |
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* @param mixed $value The value to be cached |
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* @param null|string $timeout A strtotime() compatible cache time. |
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* @return boolean |
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*/ |
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public function replace($key, $value, $timeout) |
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{ |
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return $this->_redis->set($key, $value, $timeout); |
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} |
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/** |
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* Delete value from the cache |
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* |
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* @param string $key The key to uniquely identify the cached item |
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*/ |
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public function delete($key) |
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{ |
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return (boolean) $this->_redis->del($key); |
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} |
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/** |
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* Performs an atomic increment operation on specified numeric cache item. |
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* |
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* Note that if the value of the specified key is *not* an integer, the increment |
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* operation will have no effect whatsoever. Redis chooses to not typecast values |
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* to integers when performing an atomic increment operation. |
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* |
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* @param string $key Key of numeric cache item to increment |
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* @return Closure Function returning item's new value on successful increment, else `false` |
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*/ |
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public function increment($key, $step = 1, $timeout = 0) |
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{ |
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if ($timeout) { |
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$this->_expireAt($key, $timeout); |
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} |
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return $this->_redis->incr($key, $step); |
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} |
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/** |
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* Performs an atomic decrement operation on specified numeric cache item. |
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* |
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* Note that if the value of the specified key is *not* an integer, the decrement |
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* operation will have no effect whatsoever. Redis chooses to not typecast values |
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* to integers when performing an atomic decrement operation. |
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* |
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* @param string $key Key of numeric cache item to decrement |
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* @param integer $step Offset to decrement - defaults to 1 |
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* @param integer $timeout A strtotime() compatible cache time. |
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* @return Closure Function returning item's new value on successful decrement, else `false` |
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*/ |
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public function decrement($key, $step = 1, $timeout = 0) |
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{ |
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if ($timeout) { |
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$this->_expireAt($key, $timeout); |
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} |
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return $this->_redis->decr($key, $step); |
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} |
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/** |
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* Clears user-space cache |
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* |
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* @return boolean|null |
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*/ |
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public function flush() |
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{ |
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$this->_redis->flushdb(); |
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} |
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} |
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Adding a
@return
annotation to a constructor is not recommended, since a constructor does not have a meaningful return value.Please refer to the PHP core documentation on constructors.