Class yii\mongodb\Cache
| Inheritance | yii\mongodb\Cache » 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-mongodb/blob/master/Cache.php |
Cache implements a cache application component by storing cached data in a MongoDB.
By default, Cache stores session data in a MongoDB collection named 'cache' inside the default database. This collection is better to be pre-created with fields 'id' and 'expire' indexed. The collection name can be changed by setting $cacheCollection.
Please refer to yii\caching\Cache for common cache operations that are supported by Cache.
The following example shows how you can configure the application to use Cache:
'cache' => [
'class' => 'yii\mongodb\Cache',
// 'db' => 'mymongodb',
// 'cacheCollection' => 'my_cache',
]
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 |
| $cacheCollection | string|array | The name of the MongoDB collection that stores the cache data. | yii\mongodb\Cache |
| $db | yii\mongodb\Connection|array|string | The MongoDB connection object or the application component ID of the MongoDB connection. | yii\mongodb\Cache |
| $defaultDuration | integer | Default duration in seconds before a cache entry will expire. | yii\caching\Cache |
| $gcProbability | integer | The probability (parts per million) that garbage collection (GC) should be performed when storing a piece of data in the cache. | yii\mongodb\Cache |
| $keyPrefix | string | A string prefixed to every cache key so that it is unique globally in the whole cache storage. | yii\caching\Cache |
| $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\BaseObject |
| __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 an object property. | yii\base\BaseObject |
| __isset() | Checks if a property is set, i.e. defined and not null. | yii\base\BaseObject |
| __set() | Sets value of an object property. | yii\base\BaseObject |
| __unset() | Sets an object property to null. | yii\base\BaseObject |
| 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\BaseObject |
| canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\BaseObject |
| 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\Cache |
| flush() | Deletes all values from cache. | yii\caching\Cache |
| gc() | Removes the expired data values. | yii\mongodb\Cache |
| 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\BaseObject |
| hasProperty() | Returns a value indicating whether a property is defined. | yii\base\BaseObject |
| init() | Initializes the Cache component. | yii\mongodb\Cache |
| 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\mongodb\Cache |
| addValues() | Adds multiple key-value pairs to cache. | yii\caching\Cache |
| deleteValue() | Deletes a value with the specified key from cache This method should be implemented by child classes to delete the data from actual cache storage. | yii\mongodb\Cache |
| flushValues() | Deletes all values from cache. | yii\mongodb\Cache |
| getValue() | Retrieves a value from cache with a specified key. | yii\mongodb\Cache |
| getValues() | Retrieves multiple values from cache with the specified keys. | yii\caching\Cache |
| setValue() | Stores a value identified by a key in cache. | yii\mongodb\Cache |
| setValues() | Stores multiple key-value pairs in cache. | yii\caching\Cache |
Property Details
The name of the MongoDB collection that stores the cache data. Please refer to yii\mongodb\Connection::getCollection() on how to specify this parameter. This collection is better to be pre-created with fields 'id' and 'expire' indexed.
The MongoDB connection object or the application component ID of the MongoDB connection. After the Cache object is created, if you want to change this property, you should only assign it with a MongoDB connection object. Starting from version 2.0.2, this can also be a configuration array for creating the object.
The probability (parts per million) that garbage collection (GC) should be performed when storing a piece of data in the cache. Defaults to 100, meaning 0.01% chance. This number should be between 0 and 1000000. A value 0 meaning no GC will be performed at all.
Method Details
Stores a value identified by a key into cache if the cache does not contain this key.
This method should be implemented by child classes to store the data in specific cache storage.
| protected boolean addValue ( $key, $value, $expire ) | ||
| $key | string | The key identifying the value to be cached |
| $value | string | The value to be cached |
| $expire | 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 method should be implemented by child classes to delete the data from actual cache storage.
| protected boolean deleteValue ( $key ) | ||
| $key | string | The key of the value to be deleted |
| return | boolean | If no error happens during deletion |
|---|---|---|
Deletes all values from cache.
Child classes may implement this method to realize the flush operation.
| protected boolean flushValues ( ) | ||
| return | boolean | Whether the flush operation was successful. |
|---|---|---|
Removes the expired data values.
| public void gc ( $force = false ) | ||
| $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. |
Retrieves a value from cache with a specified key.
This method should be implemented by child classes to retrieve the data from specific cache storage.
| protected string|boolean getValue ( $key ) | ||
| $key | string | A unique key identifying the cached value |
| return | string|boolean | The value stored in cache, false if the value is not in the cache or expired. |
|---|---|---|
Initializes the Cache component.
This method will initialize the $db property to make sure it refers to a valid MongoDB connection.
| public void init ( ) | ||
| throws | yii\base\InvalidConfigException | if $db is invalid. |
|---|---|---|
Stores a value identified by a key in cache.
This method should be implemented by child classes to store the data in specific cache storage.
| protected boolean setValue ( $key, $value, $expire ) | ||
| $key | string | The key identifying the value to be cached |
| $value | string | The value to be cached |
| $expire | 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 |
|---|---|---|