Package org.apache.cayenne.cache
Class MapQueryCache
- java.lang.Object
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- org.apache.cayenne.cache.MapQueryCache
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- All Implemented Interfaces:
Serializable,QueryCache
public class MapQueryCache extends Object implements QueryCache, Serializable
A default implementation of theQueryCacheinterface that stores data in a non-expiring LRUMap.- Since:
- 3.0
- See Also:
- Serialized Form
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Field Summary
Fields Modifier and Type Field Description protected Map<String,Map<String,List<?>>>cacheGroupsstatic intDEFAULT_CACHE_SIZE
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Constructor Summary
Constructors Constructor Description MapQueryCache()MapQueryCache(int maxSize)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected StringcacheName(QueryMetadata metadata)voidclear()Clears all cache entries.protected Map<String,List<?>>createCache(String cacheName)protected Map<String,List<?>>createIfAbsent(String cacheName)protected Map<String,List<?>>createIfAbsent(QueryMetadata metadata)Listget(QueryMetadata metadata)Returns a cached query result for the given QueryMetadata or null if the result is not cached or is expired.Listget(QueryMetadata metadata, QueryCacheEntryFactory factory)Returns a non-null cached value.protected Map<String,List<?>>getCache(String name)voidput(QueryMetadata metadata, List results)voidremove(String key)Removes a single entry from cache.voidremoveGroup(String groupKey)Removes a group of entries identified by group key.voidremoveGroup(String groupKey, Class<?> keyType, Class<?> valueType)Removes a group of entries identified by group key.intsize()
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Method Detail
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get
public List get(QueryMetadata metadata)
Description copied from interface:QueryCacheReturns a cached query result for the given QueryMetadata or null if the result is not cached or is expired.- Specified by:
getin interfaceQueryCache
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get
public List get(QueryMetadata metadata, QueryCacheEntryFactory factory)
Returns a non-null cached value. If it is not present in the cache, it is obtained by callingQueryCacheEntryFactory.createObject()without blocking the cache. As a result there is a potential of multiple threads to be updating cache in parallel - this wouldn't lead to corruption of the cache, but can be suboptimal.- Specified by:
getin interfaceQueryCache
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put
public void put(QueryMetadata metadata, List results)
- Specified by:
putin interfaceQueryCache
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remove
public void remove(String key)
Description copied from interface:QueryCacheRemoves a single entry from cache.- Specified by:
removein interfaceQueryCache
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removeGroup
public void removeGroup(String groupKey)
Description copied from interface:QueryCacheRemoves a group of entries identified by group key. Note that depending on implementation this method may either actively remove the entries belonging to the group or just mark them as expired, so that they are refreshed on the next access. In the former case the cache size would shrink, but in the later the cache size will not change after calling this method.- Specified by:
removeGroupin interfaceQueryCache
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removeGroup
public void removeGroup(String groupKey, Class<?> keyType, Class<?> valueType)
Description copied from interface:QueryCacheRemoves a group of entries identified by group key. Can be used if cache provider supports strictly typed caches.- Specified by:
removeGroupin interfaceQueryCache- See Also:
QueryCache.removeGroup(String)
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clear
public void clear()
Description copied from interface:QueryCacheClears all cache entries.- Specified by:
clearin interfaceQueryCache
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size
public int size()
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createIfAbsent
protected Map<String,List<?>> createIfAbsent(QueryMetadata metadata)
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cacheName
protected String cacheName(QueryMetadata metadata)
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