Package org.apache.openjpa.slice

Class DistributionPolicy.Default

  • All Implemented Interfaces:
    DistributionPolicy
    Enclosing interface:
    DistributionPolicy
    public static class DistributionPolicy.Default
extends java.lang.Object
implements DistributionPolicy
    Implements a default distribution policy to store the given instance to a randomly selected available slice.

    • Constructor Summary

      Constructors 
      Constructor Description
      Default()  

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      java.lang.String distribute​(java.lang.Object pc, java.util.List<java.lang.String> slices, java.lang.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

      • Default

        public Default()

    • Method Detail

      • distribute

        public java.lang.String distribute​(java.lang.Object pc,
                                   java.util.List<java.lang.String> slices,
                                   java.lang.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()