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## org.apache.cayenne.cache
Class EhCacheQueryCache

    java.lang.Object
      org.apache.cayenne.cache.EhCacheQueryCache

All Implemented Interfaces:
  QueryCache

    public class EhCacheQueryCache

extends Object
implements QueryCache

Field Summary
`protected CacheManager` | `cacheManager`

Constructor Summary
`EhCacheQueryCache()`
`EhCacheQueryCache(CacheManager cacheManager)`
`EhCacheQueryCache(String configFile)`

Method Summary
`void` | `clear()` Clears all cache entries.
`List` | `get(QueryMetadata metadata)` Returns a cached query result for the given QueryMetadata or null if the result is not cached or is expired.
`List` | `get(QueryMetadata metadata, QueryCacheEntryFactory factory)` Returns a cached query result for the given QueryMetadata.
`Ehcache` | `getDefaultCache()` Returns default cache group.
`void` | `put(QueryMetadata metadata, List results)`
`void` | `remove(String key)` Removes a single entry from cache.
`void` | `removeGroup(String groupKey)` Removes a group of entries identified by group key.
`void` | `shutdown()` Shuts down EhCache CacheManager
`int` | `size()` Returns the number of entries currently in the cache, including expired but not removed entries.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### cacheManager

    protected CacheManager cacheManager

Constructor Detail

### EhCacheQueryCache

    public EhCacheQueryCache()

### EhCacheQueryCache

    public EhCacheQueryCache(String configFile)

### EhCacheQueryCache

    public EhCacheQueryCache(CacheManager cacheManager)

Method Detail

### get

    public List get(QueryMetadata metadata)

  Description copied from interface: `QueryCache`
  Returns a cached query result for the given QueryMetadata or null if the result is not cached or is expired.

  Specified by:
    `get` in interface `QueryCache`

### get

    public List get(QueryMetadata metadata,
                    QueryCacheEntryFactory factory)

  Description copied from interface: `QueryCache`
  Returns a cached query result for the given QueryMetadata. If the result is not cached or is expired, cache will use provided factory to rebuild the value and store it in the cache. A corollary is that this method never returns null.

  Compared to `QueryCache.get(QueryMetadata)`, this method allows the cache to do appropriate synchronization when refreshing the entry, preventing multiple threads from running the same query when a missing entry is requested by multiple threads simultaneously.

  Specified by:
    `get` in interface `QueryCache`

### put

    public void put(QueryMetadata metadata,
                    List results)

  Specified by:
    `put` in interface `QueryCache`

### remove

    public void remove(String key)

  Description copied from interface: `QueryCache`
  Removes a single entry from cache.

  Specified by:
    `remove` in interface `QueryCache`

### removeGroup

    public void removeGroup(String groupKey)

  Description copied from interface: `QueryCache`
  Removes 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:
    `removeGroup` in interface `QueryCache`

### clear

    public void clear()

  Description copied from interface: `QueryCache`
  Clears all cache entries.

  Specified by:
    `clear` in interface `QueryCache`

### size

    public int size()

  Description copied from interface: `QueryCache`
  Returns the number of entries currently in the cache, including expired but not removed entries.

  Specified by:
    `size` in interface `QueryCache`

### getDefaultCache

    public Ehcache getDefaultCache()

  Returns default cache group.

### shutdown

    @BeforeScopeEnd
    public void shutdown()

  Shuts down EhCache CacheManager

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