Cache_Memcached
extends Kohana_Cache_Memcached
extends Cache
extends Kohana_Cache
Cache_Memcached class
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Information
This class is a transparent base class for Kohana_Cache_Memcached
Constants
Properties
Constants
-
DEFAULT_EXPIRE
integer 3600
Properties
-
public static string $default
-
default driver to use
-
string(4) "file" -
public static Kohana_Cache $instances
-
instances
-
array(0) -
protected Config $_config
-
Default value:
array(0) -
protected $memcached_instance
-
Default value:
NULL
Methods
public delete(string $id ) (defined in Kohana_Cache_Memcached)
Delete a cache entry based on id
// Delete 'foo' entry from the default group
Cache::instance()->delete('foo');
// Delete 'foo' entry from the memcache group
Cache::instance('memcache')->delete('foo')
Parameters
- string $id required - Id to remove from cache
Return Values
- boolean
Source Code
public function delete($id)
{
return $this->memcached_instance->delete($this->_sanitize_id($id));
}
public delete_all() (defined in Kohana_Cache_Memcached)
Delete all cache entries.
Beware of using this method when using shared memory cache systems, as it will wipe every entry within the system for all clients.
// Delete all cache entries in the default group
Cache::instance()->delete_all();
// Delete all cache entries in the memcache group
Cache::instance('memcache')->delete_all();
Return Values
- boolean
Source Code
public function delete_all()
{
return $this->memcached_instance->flush();
}
public get(string $id [, string $default = NULL ] ) (defined in Kohana_Cache_Memcached)
Retrieve a cached value entry by id.
// Retrieve cache entry from default group
$data = Cache::instance()->get('foo');
// Retrieve cache entry from default group and return 'bar' if miss
$data = Cache::instance()->get('foo', 'bar');
// Retrieve cache entry from memcache group
$data = Cache::instance('memcache')->get('foo');
Parameters
- string $id required - Id of cache to entry
- string $default = NULL - Default value to return if cache miss
Tags
Return Values
- mixed
Source Code
public function get($id, $default = NULL)
{
$result = $this->memcached_instance->get($this->_sanitize_id($id));
if ($this->memcached_instance->getResultCode() !== Memcached::RES_SUCCESS)
{
$result = $default;
}
return $result;
}
public set(string $id , string $data [, integer $lifetime = integer 3600 ] ) (defined in Kohana_Cache_Memcached)
Set a value to cache with id and lifetime
$data = 'bar';
// Set 'bar' to 'foo' in default group, using default expiry
Cache::instance()->set('foo', $data);
// Set 'bar' to 'foo' in default group for 30 seconds
Cache::instance()->set('foo', $data, 30);
// Set 'bar' to 'foo' in memcache group for 10 minutes
if (Cache::instance('memcache')->set('foo', $data, 600))
{
// Cache was set successfully
return
}
Parameters
- string $id required - Id of cache entry
- string $data required - Data to set to cache
- integer $lifetime = integer 3600 - Lifetime in seconds
Return Values
- boolean
Source Code
public function set($id, $data, $lifetime = 3600)
{
return $this->memcached_instance->set($this->_sanitize_id($id), $data, $lifetime);
}
final public __clone() (defined in Kohana_Cache)
Overload the __clone() method to prevent cloning
Tags
Return Values
- void
Source Code
final public function __clone()
{
throw new Cache_Exception('Cloning of Kohana_Cache objects is forbidden');
}
public config([ mixed $key = NULL , mixed $value = NULL ] ) (defined in Kohana_Cache)
Getter and setter for the configuration. If no argument provided, the current configuration is returned. Otherwise the configuration is set to this class.
// Overwrite all configuration
$cache->config(array('driver' => 'memcache', '...'));
// Set a new configuration setting
$cache->config('servers', array(
'foo' => 'bar',
'...'
));
// Get a configuration setting
$servers = $cache->config('servers);
Parameters
- mixed $key = NULL - Key to set to array, either array or config path
- mixed $value = NULL - Value to associate with key
Return Values
- mixed
Source Code
public function config($key = NULL, $value = NULL)
{
if ($key === NULL)
return $this->_config;
if (is_array($key))
{
$this->_config = $key;
}
else
{
if ($value === NULL)
return Arr::get($this->_config, $key);
$this->_config[$key] = $value;
}
return $this;
}
public static instance([ string $group = NULL ] ) (defined in Kohana_Cache)
Creates a singleton of a Kohana Cache group. If no group is supplied the default cache group is used.
// Create an instance of the default group
$default_group = Cache::instance();
// Create an instance of a group
$foo_group = Cache::instance('foo');
// Access an instantiated group directly
$foo_group = Cache::$instances['default'];
Parameters
- string $group = NULL - The name of the cache group to use [Optional]
Tags
Return Values
- Cache
Source Code
public static function instance($group = NULL)
{
// If there is no group supplied, try to get it from the config
if ($group === NULL)
{
$group = Kohana::$config->load('cache.default');
}
// If there is no group supplied
if ($group === NULL)
{
// Use the default setting
$group = Cache::$default;
}
if (isset(Cache::$instances[$group]))
{
// Return the current group if initiated already
return Cache::$instances[$group];
}
$config = Kohana::$config->load('cache');
if ( ! $config->offsetExists($group))
{
throw new Cache_Exception(
'Failed to load Kohana Cache group: :group',
[':group' => $group]
);
}
$config = $config->get($group);
// Create a new cache type instance
$cache_class = 'Cache_'.ucfirst($config['driver']);
Cache::$instances[$group] = new $cache_class($config);
// Return the instance
return Cache::$instances[$group];
}
protected __construct(array $config ) (defined in Kohana_Cache_Memcached)
Ensures singleton pattern is observed, loads the default expiry
Parameters
- array $config required - Configuration
Source Code
protected function __construct(array $config)
{
if (!extension_loaded('memcached'))
{
// exception missing memcached extension
throw new Kohana_Cache_Exception('memcached extension is not loaded');
}
parent::__construct($config);
$this->memcached_instance = new Memcached;
// load servers from configuration
$servers = Arr::get($this->_config, 'servers', []);
if (empty($servers))
{
// exception no server found
throw new Kohana_Cache_Exception('no Memcached servers in config/cache.php');
}
// load options from configuration
$options = Arr::get($this->_config, 'options', []);
// set options
foreach ($options as $option => $value)
{
if ($option === Memcached::OPT_SERIALIZER && $value === Memcached::SERIALIZER_IGBINARY
&& !Memcached::HAVE_IGBINARY)
{
// exception serializer Igbinary not supported
throw new Kohana_Cache_Exception('serializer Igbinary not supported, please fix config/cache.php');
}
if ($option === Memcached::OPT_SERIALIZER && $value === Memcached::SERIALIZER_JSON
&& !Memcached::HAVE_JSON)
{
// exception serializer JSON not supported
throw new Kohana_Cache_Exception('serializer JSON not supported, please fix config/cache.php');
}
$this->memcached_instance->setOption($option, $value);
}
// add servers
foreach ($servers as $pos => $server)
{
$host = Arr::get($server, 'host');
$port = Arr::get($server, 'port', NULL);
$weight = Arr::get($server, 'weight', NULL);
$status = Arr::get($server, 'status', TRUE);
if (!empty($host))
{
// status can be used by an external healthcheck to mark the memcached instance offline
if ($status === TRUE)
{
$this->memcached_instance->addServer($host, $port, $weight);
}
}
else
{
// exception no server host
throw new Kohana_Cache_Exception('no host defined for server[' .$pos . '] in config/cache.php');
}
}
}
protected _sanitize_id(string $id ) (defined in Kohana_Cache)
Replaces troublesome characters with underscores and adds prefix to avoid duplicates
// Sanitize a cache id
$id = $this->_sanitize_id($id);
Parameters
- string $id required - Id of cache to sanitize
Return Values
- string
Source Code
protected function _sanitize_id($id)
{
// adding cache prefix to avoid duplicates
$prefix = '';
// configuration for the specific cache group
if (isset($this->_config['prefix']) AND $this->_config['prefix'] !== NULL)
{
$prefix = $this->_config['prefix'];
}
// prefix general configuration cache
else
{
$prefix = Kohana::$config->load('cache.prefix');
}
// sha1 the id makes sure name is not too long and has not any not allowed characters
return $prefix.sha1($id);
}
