org.springframework.cache.concurrent

## Class ConcurrentMapCacheFactoryBean

- java.lang.Object
- - org.springframework.cache.concurrent.ConcurrentMapCacheFactoryBean

- All Implemented Interfaces:
    Aware, BeanNameAware, FactoryBean<ConcurrentMapCache>, InitializingBean

      public class ConcurrentMapCacheFactoryBean
      extends Object
      implements FactoryBean<ConcurrentMapCache>, BeanNameAware, InitializingBean

  `FactoryBean` for easy configuration of a `ConcurrentMapCache` when used within a Spring container. Can be configured through bean properties; uses the assigned Spring bean name as the default cache name.

  Useful for testing or simple caching scenarios, typically in combination with `SimpleCacheManager` or dynamically through `ConcurrentMapCacheManager`.

  Since:
    3.1
  Author:
    Costin Leau, Juergen Hoeller

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `ConcurrentMapCacheFactoryBean()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `afterPropertiesSet()` Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
    `ConcurrentMapCache` | `getObject()` Return an instance (possibly shared or independent) of the object managed by this factory.
    `Class<?>` | `getObjectType()` Return the type of object that this FactoryBean creates, or `null` if not known in advance.
    `boolean` | `isSingleton()` Is the object managed by this factory a singleton? That is, will `FactoryBean.getObject()` always return the same object (a reference that can be cached)?
    `void` | `setAllowNullValues(boolean allowNullValues)` Set whether to allow `null` values (adapting them to an internal null holder value).
    `void` | `setBeanName(String beanName)` Set the name of the bean in the bean factory that created this bean.
    `void` | `setName(String name)` Specify the name of the cache.
    `void` | `setStore(ConcurrentMap<Object,Object> store)` Specify the ConcurrentMap to use as an internal store (possibly pre-populated).

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### ConcurrentMapCacheFactoryBean

          public ConcurrentMapCacheFactoryBean()

  - ### Method Detail

    - #### setName

          public void setName(String name)

      Specify the name of the cache.

      Default is "" (empty String).

    - #### setStore

          public void setStore(ConcurrentMap<Object,Object> store)

      Specify the ConcurrentMap to use as an internal store (possibly pre-populated).

      Default is a standard `ConcurrentHashMap`.

    - #### setAllowNullValues

          public void setAllowNullValues(boolean allowNullValues)

      Set whether to allow `null` values (adapting them to an internal null holder value).

      Default is "true".

    - #### setBeanName

          public void setBeanName(String beanName)

      Description copied from interface: `BeanNameAware`
      Set the name of the bean in the bean factory that created this bean.

      Invoked after population of normal bean properties but before an init callback such as `InitializingBean.afterPropertiesSet()` or a custom init-method.

      Specified by:
        `setBeanName` in interface `BeanNameAware`
      Parameters:
        `beanName` - the name of the bean in the factory. Note that this name is the actual bean name used in the factory, which may differ from the originally specified name: in particular for inner bean names, the actual bean name might have been made unique through appending "#..." suffixes. Use the `BeanFactoryUtils.originalBeanName(String)` method to extract the original bean name (without suffix), if desired.

    - #### afterPropertiesSet

          public void afterPropertiesSet()

      Description copied from interface: `InitializingBean`
      Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

      This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

      Specified by:
        `afterPropertiesSet` in interface `InitializingBean`

    - #### getObject

          public ConcurrentMapCache getObject()

      Description copied from interface: `FactoryBean`
      Return an instance (possibly shared or independent) of the object managed by this factory.

      As with a `BeanFactory`, this allows support for both the Singleton and Prototype design pattern.

      If this FactoryBean is not fully initialized yet at the time of the call (for example because it is involved in a circular reference), throw a corresponding `FactoryBeanNotInitializedException`.

      As of Spring 2.0, FactoryBeans are allowed to return `null` objects. The factory will consider this as normal value to be used; it will not throw a FactoryBeanNotInitializedException in this case anymore. FactoryBean implementations are encouraged to throw FactoryBeanNotInitializedException themselves now, as appropriate.

      Specified by:
        `getObject` in interface `FactoryBean<ConcurrentMapCache>`
      Returns:
        an instance of the bean (can be `null`)
      See Also:
        `FactoryBeanNotInitializedException`

    - #### getObjectType

          public Class<?> getObjectType()

      Description copied from interface: `FactoryBean`
      Return the type of object that this FactoryBean creates, or `null` if not known in advance.

      This allows one to check for specific types of beans without instantiating objects, for example on autowiring.

      In the case of implementations that are creating a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.

      This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.

      NOTE: Autowiring will simply ignore FactoryBeans that return `null` here. Therefore it is highly recommended to implement this method properly, using the current state of the FactoryBean.

      Specified by:
        `getObjectType` in interface `FactoryBean<ConcurrentMapCache>`
      Returns:
        the type of object that this FactoryBean creates, or `null` if not known at the time of the call
      See Also:
        `ListableBeanFactory.getBeansOfType(java.lang.Class<T>)`

    - #### isSingleton

          public boolean isSingleton()

      Description copied from interface: `FactoryBean`
      Is the object managed by this factory a singleton? That is, will `FactoryBean.getObject()` always return the same object (a reference that can be cached)?

      NOTE: If a FactoryBean indicates to hold a singleton object, the object returned from `getObject()` might get cached by the owning BeanFactory. Hence, do not return `true` unless the FactoryBean always exposes the same reference.

      The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

      NOTE: This method returning `false` does not necessarily indicate that returned objects are independent instances. An implementation of the extended `SmartFactoryBean` interface may explicitly indicate independent instances through its `SmartFactoryBean.isPrototype()` method. Plain `FactoryBean` implementations which do not implement this extended interface are simply assumed to always return independent instances if the `isSingleton()` implementation returns `false`.

      Specified by:
        `isSingleton` in interface `FactoryBean<ConcurrentMapCache>`
      Returns:
        whether the exposed object is a singleton
      See Also:
        `FactoryBean.getObject()`, `SmartFactoryBean.isPrototype()`