CDummyCache
| 包 | system.caching |
|---|---|
| 继承 | class CDummyCache » CApplicationComponent » CComponent |
| 实现 | IApplicationComponent, ICache, ArrayAccess |
| 可用自 | 1.0 |
| 版本 | $Id$ |
CDummyCache does not do/cache anything. It is used as the default 'cache' application component.
公共属性
| 属性 | 类型 | 描述 | 被定义在 |
|---|---|---|---|
| behaviors | array | the behaviors that should be attached to this component. | CApplicationComponent |
| isInitialized | boolean | whether this application component has been initialized (i. | CApplicationComponent |
| keyPrefix | string | a string prefixed to every cache key so that it is unique. | CDummyCache |
公共方法
| 方法 | 描述 | 被定义在 |
|---|---|---|
| __call() | Calls the named method which is not a class method. | CComponent |
| __get() | Returns a property value, an event handler list or a behavior based on its name. | CComponent |
| __isset() | Checks if a property value is null. | CComponent |
| __set() | Sets value of a component property. | CComponent |
| __unset() | Sets a component property to be null. | CComponent |
| add() | Stores a value identified by a key into cache if the cache does not contain this key. | CDummyCache |
| asa() | Returns the named behavior object. | CComponent |
| attachBehavior() | Attaches a behavior to this component. | CComponent |
| attachBehaviors() | Attaches a list of behaviors to the component. | CComponent |
| attachEventHandler() | Attaches an event handler to an event. | CComponent |
| canGetProperty() | Determines whether a property can be read. | CComponent |
| canSetProperty() | Determines whether a property can be set. | CComponent |
| delete() | Deletes a value with the specified key from cache | CDummyCache |
| detachBehavior() | Detaches a behavior from the component. | CComponent |
| detachBehaviors() | Detaches all behaviors from the component. | CComponent |
| detachEventHandler() | Detaches an existing event handler. | CComponent |
| disableBehavior() | Disables an attached behavior. | CComponent |
| disableBehaviors() | Disables all behaviors attached to this component. | CComponent |
| enableBehavior() | Enables an attached behavior. | CComponent |
| enableBehaviors() | Enables all behaviors attached to this component. | CComponent |
| flush() | Deletes all values from cache. | CDummyCache |
| get() | Retrieves a value from cache with a specified key. | CDummyCache |
| getEventHandlers() | Returns the list of attached event handlers for an event. | CComponent |
| getIsInitialized() | CApplicationComponent | |
| hasEvent() | Determines whether an event is defined. | CComponent |
| hasEventHandler() | Checks whether the named event has attached handlers. | CComponent |
| hasProperty() | Determines whether a property is defined. | CComponent |
| init() | Initializes the application component. | CDummyCache |
| mget() | Retrieves multiple values from cache with the specified keys. | CDummyCache |
| offsetExists() | Returns whether there is a cache entry with a specified key. | CDummyCache |
| offsetGet() | Retrieves the value from cache with a specified key. | CDummyCache |
| offsetSet() | Stores the value identified by a key into cache. | CDummyCache |
| offsetUnset() | Deletes the value with the specified key from cache | CDummyCache |
| raiseEvent() | Raises an event. | CComponent |
| set() | Stores a value identified by a key into cache. | CDummyCache |
属性详情
a string prefixed to every cache key so that it is unique. Defaults to application ID.
方法详情
|
public boolean add(string $id, mixed $value, integer $expire=0, ICacheDependency $dependency=NULL)
| ||
| $id | string | the key identifying the value to be cached |
| $value | mixed | the value to be cached |
| $expire | integer | the number of seconds in which the cached value will expire. 0 means never expire. |
| $dependency | ICacheDependency | dependency of the cached item. If the dependency changes, the item is labeled invalid. |
| {return} | boolean | true if the value is successfully stored into cache, false otherwise |
Stores a value identified by a key into cache if the cache does not contain this key. Nothing will be done if the cache already contains the key.
|
public boolean delete(string $id)
| ||
| $id | string | the key of the value to be deleted |
| {return} | boolean | if no error happens during deletion |
Deletes a value with the specified key from cache
|
public void flush()
|
Deletes all values from cache. Be careful of performing this operation if the cache is shared by multiple applications. Child classes may implement this method to realize the flush operation.
|
public mixed get(string $id)
| ||
| $id | string | a key identifying the cached value |
| {return} | mixed | the value stored in cache, false if the value is not in the cache, expired or the dependency has changed. |
Retrieves a value from cache with a specified key.
|
public void init()
|
Initializes the application component. This method overrides the parent implementation by setting default cache key prefix.
|
public array mget(array $ids)
| ||
| $ids | array | list of keys identifying the cached values |
| {return} | array | list of cached values corresponding to the specified keys. The array is returned in terms of (key,value) pairs. If a value is not cached or expired, the corresponding array value will be false. |
Retrieves multiple values from cache with the specified keys. Some caches (such as memcache, apc) allow retrieving multiple cached values at one time, which may improve the performance since it reduces the communication cost. In case a cache doesn't support this feature natively, it will be simulated by this method.
|
public boolean offsetExists(string $id)
| ||
| $id | string | a key identifying the cached value |
| {return} | boolean | |
Returns whether there is a cache entry with a specified key. This method is required by the interface ArrayAccess.
|
public mixed offsetGet(string $id)
| ||
| $id | string | a key identifying the cached value |
| {return} | mixed | the value stored in cache, false if the value is not in the cache or expired. |
Retrieves the value from cache with a specified key. This method is required by the interface ArrayAccess.
|
public void offsetSet(string $id, mixed $value)
| ||
| $id | string | the key identifying the value to be cached |
| $value | mixed | the value to be cached |
Stores the value identified by a key into cache. If the cache already contains such a key, the existing value will be replaced with the new ones. To add expiration and dependencies, use the set() method. This method is required by the interface ArrayAccess.
|
public boolean offsetUnset(string $id)
| ||
| $id | string | the key of the value to be deleted |
| {return} | boolean | if no error happens during deletion |
Deletes the value with the specified key from cache This method is required by the interface ArrayAccess.
|
public boolean set(string $id, mixed $value, integer $expire=0, ICacheDependency $dependency=NULL)
| ||
| $id | string | the key identifying the value to be cached |
| $value | mixed | the value to be cached |
| $expire | integer | the number of seconds in which the cached value will expire. 0 means never expire. |
| $dependency | ICacheDependency | dependency of the cached item. If the dependency changes, the item is labeled invalid. |
| {return} | boolean | true if the value is successfully stored into cache, false otherwise |
Stores a value identified by a key into cache. If the cache already contains such a key, the existing value and expiration time will be replaced with the new ones.