org.apache.openjpa.slice
Class DistributionPolicy.Default

java.lang.Object
  extended by 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()


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