org.datanucleus.store.federation

Class FederatedQueryManager

java.lang.Object

org.datanucleus.store.query.QueryManager

org.datanucleus.store.federation.FederatedQueryManager

public class FederatedQueryManager
extends QueryManager

Manager for queries for federated datastores. Responsible for distributing queries across multiple datastores and federating the results.

Field Summary

Fields inherited from class org.datanucleus.store.query.QueryManager

LOCALISER, nucleusCtx, storeMgr

Constructor Summary

Constructors

Constructor and Description
FederatedQueryManager(NucleusContext nucleusContext, StoreManager storeMgr)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	initialiseQueryCaches() Method to find and initialise the query cache, for caching query compilations.
Query	newQuery(String language, ExecutionContext ec, Object query) Method to generate a new query using the passed query as basis.

Methods inherited from class org.datanucleus.store.query.QueryManager

addDatastoreQueryCompilation, addDatastoreQueryResult, addQueryCompilation, close, deleteDatastoreQueryCompilation, evictQueryResultsForType, getDatastoreQueryCompilation, getDatastoreQueryResult, getInMemoryEvaluatorForMethod, getQueryCompilationCache, getQueryCompilationForQuery, getQueryDatastoreCompilationCache, getQueryResultsCache

Methods inherited from class java.lang.Object

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

Constructor Detail

FederatedQueryManager

public FederatedQueryManager(NucleusContext nucleusContext,
                     StoreManager storeMgr)

Method Detail

initialiseQueryCaches

protected void initialiseQueryCaches()

Method to find and initialise the query cache, for caching query compilations.

Overrides:

initialiseQueryCaches in class QueryManager

newQuery

public Query newQuery(String language,
             ExecutionContext ec,
             Object query)

Method to generate a new query using the passed query as basis.

Overrides:

newQuery in class QueryManager

Parameters:

language - The query language

ec - ExecutionContext

query - The query filter (String) or a previous Query

Returns:

The Query