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## org.apache.cayenne.cache
Interface QueryCache

All Known Implementing Classes:
  MapQueryCache, OSQueryCache

    public interface QueryCache

An interface that defines generic QueryCache.

Since:
  3.0
Author:
  Andrus Adamchik

Method Summary
`void` | `clear()` Clears all 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.
`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.
`int` | `size()`

Method Detail

### get

    List get(QueryMetadata metadata)

  Returns a cached query result for the given QueryMetadata or null if the result is not cached or is expired.

### get

    List get(QueryMetadata metadata,
             QueryCacheEntryFactory factory)

  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 `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.

### put

    void put(QueryMetadata metadata,
             List results)

### remove

    void remove(String key)

  Removes a single entry from cache.

### removeGroup

    void removeGroup(String groupKey)

  Removes a group of entries identified by group key. This may not be supported by the implementation.

### clear

    void clear()

  Clears all entries.

### size

    int size()

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