org.apache.openjpa.slice

Interface QueryTargetPolicy

public interface QueryTargetPolicy

Policy to select one or more of the physical databases referred as slice in which a given query will be executed.

Author:

Pinaki Poddar

See Also:

DistributionPolicy

Method Summary

Modifier and Type	Method and Description
String[]	getTargets(String query, Map<Object,Object> params, String language, List<String> slices, Object context) Gets the name of the slices where a given query will be executed.

Method Detail

getTargets

String[] getTargets(String query,
                    Map<Object,Object> params,
                    String language,
                    List<String> slices,
                    Object context)

Gets the name of the slices where a given query will be executed.

Parameters:

query - The query string to be executed.

params - the bound parameters of the query

language - the query language

slices - list of names of the active slices. The ordering of the list is either explicit openjpa.slice.Names property or implicit i.e. alphabetic order of available identifiers if openjpa.slice.Names is unspecified.

context - generic persistence context managing the given instance.

Returns:

identifier of the slices. This names must match one of the given slice names.

See Also:

DistributedConfiguration.getActiveSliceNames()