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Developer manual
Jelix 1.3.9

Chapter: Using cache

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jCache is a class to store any data in a cache system like memcache. It supports other kind of storage like files or a SQL database.

Note that jCache doesn't use jKVDb as a backend, but it could use it in next versions.

Configuration

You should declare storages in a var/config/profiles.ini.php file. See the corresponding chapter to know how to use this file. It may contain some section, corresponding to a "profile", like for jDb or jKVDb.

The connection type to indicate in profile names is jcache.

Each profile must declare these properties:

  • driver: the driver name for the storage backend
  • enabled: to enable or disable the cache for this profile (1 or 0). You can then disable the cache without modifying your classes, when you develop or want to debug something.
  • ttl: the default time to live of data, in seconds. 0 means no timeout.

Depending of the driver, you may have additional parameters.

memcache backend

It is a driver for memcache, using the memcache API of PHP (not memcached API).

The configuration parameter is server, containing a list of host and port.


[jcache:mymemcache]
driver=memcache
ttl=360
enabled=1
servers = memcache_host1:11211,memcache_host2:11211,memcache_host3:11211

file backend

It is similar to the file driver of jKVDb. Here are its configuration parameters:

  • driver=file
  • cache_dir: the directory where to store the files. by default: temp/yourapp/cache/.
  • file_locking=1 to disable or enable file locking (keep to 1 is better)
  • directory level: Set the directory structure level. 0 means "no directory structure", 1 means "one level of directory", 2 means "two levels"...
  • directory_umask: umask for directory structure (default '0700')
  • file_name_prefix: prefix for cache files (default 'jelix_cache')
  • cache_file_umask: umask for cache files (default '0600')

sql backend

This driver uses a sql table to store cache values. The installer of jelix creates the needed table if you use this backend. If it is already installed, during developpement, use one of the lib/jelix/core-modules/jelix/install/sql/install_jcache.schema.* files to create the table.

Configuration parameters:

  • dao: indicates the dao to use. By default, jelix~cache.
  • dbprofile: the jDb profile to use.

Using jCache

To store and read from the cache system, call one of the static methods of jCache.

  • jCache::get($key): to retrieve the value corresponding to the given key.
  • jCache::set($key, $value, $ttl): to store a new value or modify an existing value. $ttl is optional
  • jCache::delete($key): delete the given key-value
  • jCache::increment($key): increment the value. You can indicate also the value of the incrementation
  • jCache::decrement($key): decrement the value. You can indicate also the value of the decrementation
  • jCache::add($key, $value): to store a new value. return false if the key already exists
  • jCache::replace($key,$value, $ttl): to change the value of the corresponding key. If the key doesn't exist, it returns false. $ttl is optional.
  • jCache::garbage(): delete all expired keys
  • jCache::flush(): delete all keys
  • jCache::call($fn, $fnargs, $ttl): get the value corresponding to the function name/args. If it is not set, call the function $fn with arguments $fnargs, which should return a value. This value is then put into the cache.

All this static methods accept as last argument a profile. By default, the "default" profile will be used.

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