QueryDatastoreCompilationCache (DataNucleus Core 6.0.1-SNAPSHOT API)

All Known Implementing Classes:

AbstractQueryDatastoreCompilationCache, JavaxCacheQueryDatastoreCompilationCache, SoftQueryDatastoreCompilationCache, StrongQueryDatastoreCompilationCache, WeakQueryDatastoreCompilationCache
```
public interface QueryDatastoreCompilationCache
```
Cache for query compilations (datastore-specific).

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`clear()`	Method to clear the cache.
`void`	`close()`	Method to close the cache when no longer needed.
`boolean`	`contains(String queryKey)`	Accessor for whether the specified query is in the cache
`void`	`evict(String queryKey)`	Evict the query from the compilation cache.
`Object`	`get(String queryKey)`	Accessor for a (generic) compilation from the cache.
`boolean`	`isEmpty()`	Accessor for whether the cache is empty.
`Object`	`put(String queryKey, Object compilation)`	Method to put an object in the cache.
`int`	`size()`	Accessor for the total number of compilations in the query cache.

- Method Detail
  - close
```
void close()
```
    Method to close the cache when no longer needed. Provides a hook to release resources etc.
  - evict
```
void evict(String queryKey)
```
    Evict the query from the compilation cache.
    
    Parameters:
    
    queryKey - Key for the query to evict.
  - clear
```
void clear()
```
    Method to clear the cache.
  - isEmpty
```
boolean isEmpty()
```
    Accessor for whether the cache is empty.
    
    Returns:
    
    Whether it is empty.
  - size
```
int size()
```
    Accessor for the total number of compilations in the query cache.
    
    Returns:
    
    Number of queries
  - get
```
Object get(String queryKey)
```
    Accessor for a (generic) compilation from the cache.
    
    Parameters:
    
    queryKey - The query key
    
    Returns:
    
    The cached query compilation
  - put
```
Object put(String queryKey,
           Object compilation)
```
    Method to put an object in the cache.
    
    Parameters:
    
    queryKey - The query key
    
    compilation - The compilation for this datastore
    
    Returns:
    
    The cached compilation previously associated with this query (if any)
  - contains
```
boolean contains(String queryKey)
```
    Accessor for whether the specified query is in the cache
    
    Parameters:
    
    queryKey - The query key
    
    Returns:
    
    Whether it is in the cache