java/src/main/com/google/appengine/api/labs/datastore/overlay/OverlayBaseDatastoreService.java

   1 package com.google.appengine.api.labs.datastore.overlay;
   2
   3 import com.google.appengine.api.datastore.BaseDatastoreService;
   4 import com.google.appengine.api.datastore.DatastoreService;
   5
   6 /**
   7  * A {@link DatastoreService} using an overlay model. Conceptually, an overlay Datastore is based on
   8  * some other Datastore (the "parent"). The overlay allows developers to effectively update or
   9  * delete entities on the parent, but without actually modifying the data that the parent stores.
  10  * (There is one exception: ID allocation is forwarded to the parent Datastore.)
  11  */
  12 interface OverlayBaseDatastoreService extends BaseDatastoreService {
  13   /** Gets the name of the overlay. */
  14   String getName();
  15
  16   /** Gets the parent Datastore for the overlay. */
  17   BaseDatastoreService getParentDatastoreService();
  18 }