Examples with ReadPolicy com.google.appengine.api.datastore.ReadPolicy used on opensource projects

Example 1 with ReadPolicy

use of com.google.appengine.api.datastore.ReadPolicy in project java-docs-samples by GoogleCloudPlatform.

the class ReadPolicyTest method readPolicy_strong_returnsAllResults.

@Test
public void readPolicy_strong_returnsAllResults() {
    double deadline = 5.0;
    ReadPolicy policy = new ReadPolicy(ReadPolicy.Consistency.STRONG);
    DatastoreServiceConfig datastoreConfig = DatastoreServiceConfig.Builder.withReadPolicy(policy).deadline(deadline);
    DatastoreService datastore = DatastoreServiceFactory.getDatastoreService(datastoreConfig);
    Entity parent = new Entity("Person", "a");
    Entity child = new Entity("Person", "b", parent.getKey());
    datastore.put(ImmutableList.<Entity>of(parent, child));
    Query q = new Query("Person").setAncestor(parent.getKey());
    List<Entity> results = datastore.prepare(q).asList(FetchOptions.Builder.withDefaults());
    assertThat(results).named("query results").hasSize(2);
}

Example 2 with ReadPolicy

use of com.google.appengine.api.datastore.ReadPolicy in project java-docs-samples by GoogleCloudPlatform.

the class ReadPolicyTest method readPolicy_eventual_returnsNoResults.

@Test
public void readPolicy_eventual_returnsNoResults() {
    // [START data_consistency]
    double deadline = 5.0;
    // Construct a read policy for eventual consistency
    ReadPolicy policy = new ReadPolicy(ReadPolicy.Consistency.EVENTUAL);
    // Set the read policy
    DatastoreServiceConfig eventuallyConsistentConfig = DatastoreServiceConfig.Builder.withReadPolicy(policy);
    // Set the call deadline
    DatastoreServiceConfig deadlineConfig = DatastoreServiceConfig.Builder.withDeadline(deadline);
    // Set both the read policy and the call deadline
    DatastoreServiceConfig datastoreConfig = DatastoreServiceConfig.Builder.withReadPolicy(policy).deadline(deadline);
    // Get Datastore service with the given configuration
    DatastoreService datastore = DatastoreServiceFactory.getDatastoreService(datastoreConfig);
    // [END data_consistency]
    Entity parent = new Entity("Person", "a");
    Entity child = new Entity("Person", "b", parent.getKey());
    datastore.put(ImmutableList.<Entity>of(parent, child));
    // Even though we are using an ancestor query, the policy is set to
    // eventual, so we should get eventually-consistent results. Since the
    // local data store test config is set to 100% unapplied jobs, there
    // should be no results.
    Query q = new Query("Person").setAncestor(parent.getKey());
    List<Entity> results = datastore.prepare(q).asList(FetchOptions.Builder.withDefaults());
    assertThat(results).named("query results").isEmpty();
}

Example 3 with ReadPolicy

use of com.google.appengine.api.datastore.ReadPolicy in project qi4j-sdk by Qi4j.

the class GaeEntityStoreMixin method activateGaeEntityStore.

@Override
public void activateGaeEntityStore() throws Exception {
    GaeEntityStoreConfiguration conf = config.get();
    // eventually consistent reads with a 5 second deadline
    DatastoreServiceConfig configuration = withReadPolicy(new ReadPolicy(ReadPolicy.Consistency.valueOf(conf.readPolicy().get().toUpperCase()))).deadline(conf.deadline().get());
    datastore = DatastoreServiceFactory.getDatastoreService(configuration);
    entityKind = conf.entityKind().get();
    System.out.println("\nActivating Google App Engine Store" + "\n----------------------------------" + "\n      Read Policy: " + conf.readPolicy().get() + "\n         Deadline: " + conf.deadline().get() + "\n      Entity Kind: " + entityKind + "\n        Datastore: " + datastore + "\n    Configuration: " + configuration + "\n");
}