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.
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 |
DistributionPolicy.Default
public DistributionPolicy.Default()
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()
Copyright © 2006-2012 Apache Software Foundation. All Rights Reserved.