Implement atomic increment/decrement in Cache library
Requested via issue #109
Supersedes PR #241
diff --git a/system/libraries/Cache/drivers/Cache_redis.php b/system/libraries/Cache/drivers/Cache_redis.php
index 48c803d..b6fddf0 100644
--- a/system/libraries/Cache/drivers/Cache_redis.php
+++ b/system/libraries/Cache/drivers/Cache_redis.php
@@ -63,7 +63,7 @@
/**
* Get cache
*
- * @param string Cache key identifier
+ * @param string Cache ID
* @return mixed
*/
public function get($key)
@@ -76,16 +76,17 @@
/**
* Save cache
*
- * @param string Cache key identifier
- * @param mixed Data to save
- * @param int Time to live
- * @return bool
+ * @param string $id Cache ID
+ * @param mixed $data Data to save
+ * @param int $ttl Time to live in seconds
+ * @param bool $raw Whether to store the raw value (unused)
+ * @return bool TRUE on success, FALSE on failure
*/
- public function save($key, $value, $ttl = NULL)
+ public function save($id, $data, $ttl = 60, $raw = FALSE)
{
return ($ttl)
- ? $this->_redis->setex($key, $ttl, $value)
- : $this->_redis->set($key, $value);
+ ? $this->_redis->setex($id, $ttl, $data)
+ : $this->_redis->set($id, $data);
}
// ------------------------------------------------------------------------
@@ -104,6 +105,38 @@
// ------------------------------------------------------------------------
/**
+ * Increment a raw value
+ *
+ * @param string $id Cache ID
+ * @param int $offset Step/value to add
+ * @return mixed New value on success or FALSE on failure
+ */
+ public function increment($id, $offset = 1)
+ {
+ return $this->_redis->exists($id)
+ ? $this->_redis->incr($id, $offset)
+ : FALSE;
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
+ * Decrement a raw value
+ *
+ * @param string $id Cache ID
+ * @param int $offset Step/value to reduce by
+ * @return mixed New value on success or FALSE on failure
+ */
+ public function decrement($id, $offset = 1)
+ {
+ return $this->_redis->exists($id)
+ ? $this->_redis->decr($id, $offset)
+ : FALSE;
+ }
+
+ // ------------------------------------------------------------------------
+
+ /**
* Clean cache
*
* @return bool