java/src/main/com/google/appengine/api/datastore/DatastoreAttributes.java

   1 // Copyright 2010 Google Inc. All Rights Reserved.
   2
   3 package com.google.appengine.api.datastore;
   4
   5 import com.google.appengine.api.appidentity.AppIdentityService;
   6 import com.google.appengine.api.appidentity.AppIdentityService.ParsedAppId;
   7 import com.google.appengine.api.appidentity.AppIdentityServiceFactory;
   8
   9 /**
  10  * Attributes of a datastore.
  11  *
  12  */
  13 public final class DatastoreAttributes {
  14   /**
  15    * Indicates the type of datastore being used.
  16    *
  17    */
  18   public enum DatastoreType {
  19     UNKNOWN,
  20     MASTER_SLAVE,
  21     HIGH_REPLICATION,
  22   }
  23
  24   private final DatastoreType datastoreType;
  25   private static final AppIdentityService appIdentityService =
  26       AppIdentityServiceFactory.getAppIdentityService();
  27
  28   DatastoreAttributes() {
  29     ParsedAppId identity = appIdentityService.parseFullAppId(DatastoreApiHelper.getCurrentAppId());
  30     datastoreType = identity.getPartition().isEmpty() ?
  31         DatastoreType.MASTER_SLAVE : DatastoreType.HIGH_REPLICATION;
  32   }
  33
  34   /**
  35    * Gets the datastore type.
  36    *
  37    * Only guaranteed to return something other than {@link
  38    * DatastoreType#UNKNOWN} when running in production and querying the current
  39    * app.
  40    */
  41   public DatastoreType getDatastoreType() {
  42     return datastoreType;
  43   }
  44 }