org.apache.openjpa.slice
Class DistributionPolicy.Default

java.lang.Object
  org.apache.openjpa.slice.DistributionPolicy.Default

All Implemented Interfaces:

DistributionPolicy

Enclosing interface:

DistributionPolicy

public static class DistributionPolicy.Default
extends Object
implements DistributionPolicy

Implements a default distribution policy to store the given instance to a randomly selected available slice.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.openjpa.slice.DistributionPolicy

DistributionPolicy.Default

Constructor Summary

DistributionPolicy.Default()

Method Summary

String

distribute(Object pc, List<String> slices, Object ctx) Gets the name of the target slice where the given newly persistent or the detached, to-be-merged instance will be stored.

Methods inherited from class java.lang.Object

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

Constructor Detail

DistributionPolicy.Default

public DistributionPolicy.Default()

Method Detail

distribute

public String distribute(Object pc,
                         List<String> slices,
                         Object ctx)

Description copied from interface: DistributionPolicy

Gets the name of the target slice where the given newly persistent or the detached, to-be-merged instance will be stored.
If the current state of the given instance is sufficient to determine the target slice, return null. In that case, the runtime will callback this method again before the instance being flushed to the datastore. By then, the policy must be able to determine the target slice.

Specified by:

distribute in interface DistributionPolicy

Parameters:

pc - The newly persistent or to-be-merged object.

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.

ctx - the generic persistence context managing the given instance.

Returns:

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

See Also:

DistributedConfiguration.getActiveSliceNames()