org.broadleafcommerce.common.cache

Class AbstractCacheMissAware

java.lang.Object

org.broadleafcommerce.common.cache.AbstractCacheMissAware

Direct Known Subclasses:

SystemPropertiesDaoImpl

public abstract class AbstractCacheMissAware
extends Object

Support for any class that wishes to utilize a query miss cache. This cache is capable of caching a query miss (the query returns no results). This is beneficial since standard level 2 cache does not maintain misses. NOTE, special cache invalidation support must be added to address this cache if a change is made to one or more of the cached missed items.

Author:

Jeff Fischer

Field Summary

Fields

Modifier and Type	Field and Description
protected net.sf.ehcache.Cache	cache
protected StatisticsService	statisticsService

Constructor Summary

Constructors

Constructor and Description
AbstractCacheMissAware()

Method Summary

Modifier and Type	Method and Description
protected String	buildKey(String... params) Build the key representing this missed cache item.
protected void	clearCache(String cacheName) Remove all items from the underlying cache - a complete clear
protected net.sf.ehcache.Cache	getCache(String cacheName) Retrieve the underlying cache for this query miss cache.
protected <T> T	getCachedObject(Class<T> responseClass, String cacheName, String statisticsName, PersistentRetrieval<T> retrieval, String... params) This is the main entry point for retrieving an object from this cache.
protected abstract org.apache.commons.logging.Log	getLogger() To provide more accurate logging, this abstract cache should utilize a logger from its child implementation.
protected <T> T	getNullObject(Class<T> responseClass) Retrieve a null representation of the cache item.
protected <T> T	getObjectFromCache(String key, String cacheName) Retrieve the missed cache item from the specified cache.
protected void	removeItemFromCache(String cacheName, String... params) Remove a specific cache item from the underlying cache

Methods inherited from class java.lang.Object

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

Field Detail

statisticsService

protected StatisticsService statisticsService

cache

protected net.sf.ehcache.Cache cache

Constructor Detail

AbstractCacheMissAware

public AbstractCacheMissAware()

Method Detail

buildKey

protected String buildKey(String... params)

Build the key representing this missed cache item. Will include sandbox and/or site information if appropriate.

Parameters:

params - the appropriate params comprising a unique key for this cache item

Returns:

the completed key

getObjectFromCache

protected <T> T getObjectFromCache(String key,
                                   String cacheName)

Retrieve the missed cache item from the specified cache.

Type Parameters:

T - the type of the cache item

Parameters:

key - the unique key for the cache item

cacheName - the name of the cache - this is the cache region name from ehcache config

Returns:

the cache item instance

getCache

protected net.sf.ehcache.Cache getCache(String cacheName)

Retrieve the underlying cache for this query miss cache. Presumably and Ehcache region has been configured for this cacheName.

Parameters:

cacheName - the name of the cache - the ehcache region name

Returns:

the underlying cache

removeItemFromCache

protected void removeItemFromCache(String cacheName,
                                   String... params)

Remove a specific cache item from the underlying cache

Parameters:

cacheName - the name of the cache - the ehcache region name

params - the appropriate params comprising a unique key for this cache item

clearCache

protected void clearCache(String cacheName)

Remove all items from the underlying cache - a complete clear

Parameters:

cacheName - the name of the cache - the ehcache region name

getNullObject

protected <T> T getNullObject(Class<T> responseClass)

Retrieve a null representation of the cache item. This representation is the same for all cache misses and is used as the object representation to store in the cache for a cache miss.

Type Parameters:

T - the type of the cache item

Parameters:

responseClass - the class representing the type of the cache item

Returns:

the null representation for the cache item

getCachedObject

protected <T> T getCachedObject(Class<T> responseClass,
                                String cacheName,
                                String statisticsName,
                                PersistentRetrieval<T> retrieval,
                                String... params)

This is the main entry point for retrieving an object from this cache.

Type Parameters:

T - the type of the cache item

Parameters:

responseClass - the class representing the type of the cache item

cacheName - the name of the cache - the ehcache region name

statisticsName - the name to use for cache hit statistics

retrieval - the block of code to execute if a cache miss is not found in this cache

params - the appropriate params comprising a unique key for this cache item

Returns:

The object retrieved from the executiom of the PersistentRetrieval, or null if a cache miss was found in this cache

See Also:

StatisticsService

getLogger

protected abstract org.apache.commons.logging.Log getLogger()

To provide more accurate logging, this abstract cache should utilize a logger from its child implementation.

Returns:

a Log instance from the subclass of this abstract class