Class yii\caching\FileCache
| Inheritance | yii\caching\FileCache » yii\caching\Cache » yii\base\Component » yii\base\BaseObject |
|---|---|
| Implements | yii\base\Configurable, yii\caching\CacheInterface |
| Available since version | 2.0 |
| Source Code | https://github.com/yiisoft/yii2/blob/master/framework/caching/FileCache.php |
FileCache implements a cache component using files.
For each data value being cached, FileCache will store it in a separate file. The cache files are placed under $cachePath. FileCache will perform garbage collection automatically to remove expired cache files.
Please refer to yii\caching\Cache for common cache operations that are supported by FileCache.
For more details and usage information on Cache, see the guide article on caching.
Public Properties
| Property | Type | Description | Defined By |
|---|---|---|---|
| $behaviors | yii\base\Behavior[] | List of behaviors attached to this component. This property is read-only. | yii\base\Component |
| $cacheFileSuffix | string | Cache file suffix. | yii\caching\FileCache |
| $cachePath | string | The directory to store cache files. | yii\caching\FileCache |
| $defaultDuration | integer | Default duration in seconds before a cache entry will expire. | yii\caching\Cache |
| $dirMode | integer | The permission to be set for newly created directories. | yii\caching\FileCache |
| $directoryLevel | integer | The level of sub-directories to store cache files. | yii\caching\FileCache |
| $fileMode | integer | The permission to be set for newly created cache files. | yii\caching\FileCache |
| $gcProbability | integer | The probability (parts per million) that garbage collection (GC) should be performed when storing a piece of data in the cache. | yii\caching\FileCache |
| $keyPrefix | string | A string prefixed to every cache key. | yii\caching\FileCache |
| $serializer | null|array|false | The functions used to serialize and unserialize cached data. | yii\caching\Cache |
Public Methods
| Method | Description | Defined By |
|---|---|---|
| __call() | Calls the named method which is not a class method. | yii\base\Component |
| __clone() | This method is called after the object is created by cloning an existing one. | yii\base\Component |
| __construct() | Constructor. | yii\base\BaseObject |
| __get() | Returns the value of a component property. | yii\base\Component |
| __isset() | Checks if a property is set, i.e. defined and not null. | yii\base\Component |
| __set() | Sets the value of a component property. | yii\base\Component |
| __unset() | Sets a component property to be null. | yii\base\Component |
| add() | Stores a value identified by a key into cache if the cache does not contain this key. | yii\caching\Cache |
| attachBehavior() | Attaches a behavior to this component. | yii\base\Component |
| attachBehaviors() | Attaches a list of behaviors to the component. | yii\base\Component |
| behaviors() | Returns a list of behaviors that this component should behave as. | yii\base\Component |
| buildKey() | Builds a normalized cache key from a given key. | yii\caching\Cache |
| canGetProperty() | Returns a value indicating whether a property can be read. | yii\base\Component |
| canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\Component |
| className() | Returns the fully qualified name of this class. | yii\base\BaseObject |
| delete() | Deletes a value with the specified key from cache. | yii\caching\Cache |
| detachBehavior() | Detaches a behavior from the component. | yii\base\Component |
| detachBehaviors() | Detaches all behaviors from the component. | yii\base\Component |
| ensureBehaviors() | Makes sure that the behaviors declared in behaviors() are attached to this component. | yii\base\Component |
| exists() | Checks whether a specified key exists in the cache. | yii\caching\FileCache |
| flush() | Deletes all values from cache. | yii\caching\Cache |
| gc() | Removes expired cache files. | yii\caching\FileCache |
| get() | Retrieves a value from cache with a specified key. | yii\caching\Cache |
| getBehavior() | Returns the named behavior object. | yii\base\Component |
| getBehaviors() | Returns all behaviors attached to this component. | yii\base\Component |
| getOrSet() | Method combines both set() and get() methods to retrieve value identified by a $key, or to store the result of $callable execution if there is no cache available for the $key. | yii\caching\Cache |
| hasEventHandlers() | Returns a value indicating whether there is any handler attached to the named event. | yii\base\Component |
| hasMethod() | Returns a value indicating whether a method is defined. | yii\base\Component |
| hasProperty() | Returns a value indicating whether a property is defined for this component. | yii\base\Component |
| init() | Initializes this component by ensuring the existence of the cache path. | yii\caching\FileCache |
| madd() | Stores multiple items in cache. Each item contains a value identified by a key. | yii\caching\Cache |
| mget() | Retrieves multiple values from cache with the specified keys. | yii\caching\Cache |
| mset() | Stores multiple items in cache. Each item contains a value identified by a key. | yii\caching\Cache |
| multiAdd() | Stores multiple items in cache. Each item contains a value identified by a key. | yii\caching\Cache |
| multiGet() | Retrieves multiple values from cache with the specified keys. | yii\caching\Cache |
| multiSet() | Stores multiple items in cache. Each item contains a value identified by a key. | yii\caching\Cache |
| off() | Detaches an existing event handler from this component. | yii\base\Component |
| offsetExists() | Returns whether there is a cache entry with a specified key. | yii\caching\Cache |
| offsetGet() | Retrieves the value from cache with a specified key. | yii\caching\Cache |
| offsetSet() | Stores the value identified by a key into cache. | yii\caching\Cache |
| offsetUnset() | Deletes the value with the specified key from cache This method is required by the interface ArrayAccess. | yii\caching\Cache |
| on() | Attaches an event handler to an event. | yii\base\Component |
| set() | Stores a value identified by a key into cache. | yii\caching\Cache |
| trigger() | Triggers an event. | yii\base\Component |
Protected Methods
| Method | Description | Defined By |
|---|---|---|
| addValue() | Stores a value identified by a key into cache if the cache does not contain this key. | yii\caching\FileCache |
| addValues() | Adds multiple key-value pairs to cache. | yii\caching\Cache |
| deleteValue() | Deletes a value with the specified key from cache This is the implementation of the method declared in the parent class. | yii\caching\FileCache |
| flushValues() | Deletes all values from cache. | yii\caching\FileCache |
| gcRecursive() | Recursively removing expired cache files under a directory. | yii\caching\FileCache |
| getCacheFile() | Returns the cache file path given the normalized cache key. | yii\caching\FileCache |
| getValue() | Retrieves a value from cache with a specified key. | yii\caching\FileCache |
| getValues() | Retrieves multiple values from cache with the specified keys. | yii\caching\Cache |
| setValue() | Stores a value identified by a key in cache. | yii\caching\FileCache |
| setValues() | Stores multiple key-value pairs in cache. | yii\caching\Cache |
Property Details
Cache file suffix. Defaults to '.bin'.
The directory to store cache files. You may use path alias here. If not set, it will use the "cache" subdirectory under the application runtime path.
The permission to be set for newly created directories. This value will be used by PHP chmod() function. No umask will be applied. Defaults to 0775, meaning the directory is read-writable by owner and group, but read-only for other users.
The level of sub-directories to store cache files. Defaults to 1. If the system has huge number of cache files (e.g. one million), you may use a bigger value (usually no bigger than 3). Using sub-directories is mainly to ensure the file system is not over burdened with a single directory having too many files.
The permission to be set for newly created cache files. This value will be used by PHP chmod() function. No umask will be applied. If not set, the permission will be determined by the current environment.
The probability (parts per million) that garbage collection (GC) should be performed when storing a piece of data in the cache. Defaults to 10, meaning 0.001% chance. This number should be between 0 and 1000000. A value 0 means no GC will be performed at all.
A string prefixed to every cache key. This is needed when you store cache data under the same $cachePath for different applications to avoid conflict.
To ensure interoperability, only alphanumeric characters should be used.
Method Details
Stores a value identified by a key into cache if the cache does not contain this key.
This is the implementation of the method declared in the parent class.
| protected boolean addValue ( $key, $value, $duration ) | ||
| $key | string | The key identifying the value to be cached |
| $value | string | The value to be cached. Other types (if you have disabled $serializer) unable to get is correct in getValue(). |
| $duration | integer | The number of seconds in which the cached value will expire. 0 means never expire. |
| return | boolean | True if the value is successfully stored into cache, false otherwise |
|---|---|---|
Deletes a value with the specified key from cache This is the implementation of the method declared in the parent class.
| protected boolean deleteValue ( $key ) | ||
| $key | string | The key of the value to be deleted |
| return | boolean | If no error happens during deletion |
|---|---|---|
Checks whether a specified key exists in the cache.
This can be faster than getting the value from the cache if the data is big. Note that this method does not check whether the dependency associated with the cached data, if there is any, has changed. So a call to get() may return false while exists returns true.
| public boolean exists ( $key ) | ||
| $key | mixed | A key identifying the cached value. This can be a simple string or a complex data structure consisting of factors representing the key. |
| return | boolean | True if a value exists in cache, false if the value is not in the cache or expired. |
|---|---|---|
Deletes all values from cache.
This is the implementation of the method declared in the parent class.
| protected boolean flushValues ( ) | ||
| return | boolean | Whether the flush operation was successful. |
|---|---|---|
Removes expired cache files.
| public void gc ( $force = false, $expiredOnly = true ) | ||
| $force | boolean | Whether to enforce the garbage collection regardless of $gcProbability. Defaults to false, meaning the actual deletion happens with the probability as specified by $gcProbability. |
| $expiredOnly | boolean | Whether to removed expired cache files only. If false, all cache files under $cachePath will be removed. |
Recursively removing expired cache files under a directory.
This method is mainly used by gc().
| protected void gcRecursive ( $path, $expiredOnly ) | ||
| $path | string | The directory under which expired cache files are removed. |
| $expiredOnly | boolean | Whether to only remove expired cache files. If false, all files
under |
Returns the cache file path given the normalized cache key.
| protected string getCacheFile ( $normalizedKey ) | ||
| $normalizedKey | string | Normalized cache key by buildKey() method |
| return | string | The cache file path |
|---|---|---|
Retrieves a value from cache with a specified key.
This is the implementation of the method declared in the parent class.
| protected string|false getValue ( $key ) | ||
| $key | string | A unique key identifying the cached value |
| return | string|false | The value stored in cache, false if the value is not in the cache or expired. |
|---|---|---|
Initializes this component by ensuring the existence of the cache path.
| public void init ( ) |
Stores a value identified by a key in cache.
This is the implementation of the method declared in the parent class.
| protected boolean setValue ( $key, $value, $duration ) | ||
| $key | string | The key identifying the value to be cached |
| $value | string | The value to be cached. Other types (If you have disabled $serializer) unable to get is correct in getValue(). |
| $duration | integer | The number of seconds in which the cached value will expire. 0 means never expire. |
| return | boolean | True if the value is successfully stored into cache, false otherwise |
|---|---|---|
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