Java Entity类代码示例

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
@Override
protected StructuredQuery.Builder<Entity> complete(StructuredQuery.Filter filter,
		Sort sort) {
	if (sort == null) {
		return Query.newEntityQueryBuilder()
				.setFilter(setAncestorFilter(filter));
	}

	StructuredQuery.OrderBy[] orderBy = StreamSupport
			.stream(sort.spliterator(), false)
			.map(order -> order.isAscending()
					? StructuredQuery.OrderBy.asc(order.getProperty())
					: StructuredQuery.OrderBy.desc(order.getProperty()))
			.toArray(len -> new StructuredQuery.OrderBy[len]);
	if (orderBy.length == 0) {
		return Query.newEntityQueryBuilder()
				.setFilter(setAncestorFilter(filter));
	}
	else {
		return Query.newEntityQueryBuilder()
				.addOrderBy(orderBy[0], orderBy)
				.setFilter(setAncestorFilter(filter));
	}
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
@Test
public void testAndCondition() throws Exception {
	// Setup
	GcloudDatastoreQueryCreator creator = createCreator(PersonRepository.class,
			PersonRepository.class.getMethod("findByEmailAddressAndLastName",
					String.class, String.class),
			"[email protected]", "Doe");

	// Exercise
	StructuredQuery.Builder<Entity> queryBuilder = creator.createQuery();

	// Verify
	assertEquals(
			Query.newEntityQueryBuilder()
					.setFilter(StructuredQuery.CompositeFilter.and(
							StructuredQuery.PropertyFilter.eq("emailAddress",
									"[email protected]"),
							StructuredQuery.PropertyFilter.eq("lastName", "Doe")))
					.build(),
			queryBuilder.build());
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
@Test
public void testUnmarshalToObject_Blob() {
	// Setup
	byte[] hello = "hello".getBytes(Charset.forName("UTF-8"));
	Key key = Key.newBuilder("project", "kind", 1).build();
	Entity entity = Entity.newBuilder(key).set("object", Blob.copyFrom(hello))
			.set("bytes", Blob.copyFrom(hello)).set("string", Blob.copyFrom(hello))
			.build();
	Unmarshaller unmarshaller = new Unmarshaller();
	TestBean bean = new TestBean();

	// Exercise
	unmarshaller.unmarshalToObject(entity, bean);

	// Verify
	Assert.assertArrayEquals(hello, (byte[]) bean.object);
	Assert.assertArrayEquals(hello, bean.bytes);
	Assert.assertEquals("hello", bean.string);
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
@Test
public void testUnmarshalToObject_Boolean() {
	// Setup
	Key key = Key.newBuilder("project", "kind", 1).build();
	Entity entity = Entity.newBuilder(key).set("object", true)
			.set("boxedBoolean", true).set("primitiveBoolean", true).build();
	Unmarshaller unmarshaller = new Unmarshaller();
	TestBean bean = new TestBean();

	// Exercise
	unmarshaller.unmarshalToObject(entity, bean);

	// Verify
	Assert.assertEquals(Boolean.TRUE, bean.object);
	Assert.assertEquals(Boolean.TRUE, bean.boxedBoolean);
	Assert.assertTrue(bean.primitiveBoolean);
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
@Test
public void testUnmarshalToObject_Map1() {
	// Setup
	Key key = Key.newBuilder("project", "kind", 1).build();
	Entity entity = Entity.newBuilder(key)
			.set("object", Entity.newBuilder().set("k", "v").build())
			.set("map", Entity.newBuilder().set("k", "v").build()).build();
	Unmarshaller unmarshaller = new Unmarshaller();
	TestBean bean = new TestBean();

	// Exercise
	unmarshaller.unmarshalToObject(entity, bean);

	// Verify
	Map<String, Object> expected = new HashMap<>();
	expected.put("k", "v");
	Assert.assertEquals(expected, bean.object);
	Assert.assertEquals(expected, bean.map);
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
@Test
public void testUnmarshalToObject_Map2() {
	// Setup
	Key key = Key.newBuilder("project", "kind", 1).build();
	Entity entity = Entity.newBuilder(key)
			.set("object", Entity.newBuilder()
					.set("k1", Entity.newBuilder().set("k2", "v2").build()).build())
			.set("map", Entity.newBuilder()
					.set("k1", Entity.newBuilder().set("k2", "v2").build()).build())
			.build();
	Unmarshaller unmarshaller = new Unmarshaller();
	TestBean bean = new TestBean();

	// Exercise
	unmarshaller.unmarshalToObject(entity, bean);

	// Verify
	Map<String, Object> innerMap = new HashMap<>();
	innerMap.put("k2", "v2");
	Map<String, Object> expected = new HashMap<>();
	expected.put("k1", innerMap);
	Assert.assertEquals(expected, bean.object);
	Assert.assertEquals(expected, bean.map);
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
/**
 * Marshals the given entity and and returns the equivalent Entity needed for the underlying Cloud
 * Datastore API.
 * 
 * @return A native entity that is equivalent to the POJO being marshalled. The returned value
 *         could either be a FullEntity or Entity.
 */
private BaseEntity<?> marshal() {
  marshalKey();
  if (key instanceof Key) {
    entityBuilder = Entity.newBuilder((Key) key);
  } else {
    entityBuilder = FullEntity.newBuilder(key);
  }
  marshalFields();
  marshalAutoTimestampFields();
  if (intent == Intent.UPDATE) {
    marshalVersionField();
  }
  marshalEmbeddedFields();
  return entityBuilder.build();
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
/**
 * Inserts the given list of entities into the Cloud Datastore.
 * 
 * @param entities
 *          the entities to insert.
 * @return the inserted entities. The inserted entities will not be same as the passed in
 *         entities. For example, the inserted entities may contain generated ID, key, parent key,
 *         etc.
 * @throws EntityManagerException
 *           if any error occurs while inserting.
 */
@SuppressWarnings("unchecked")
public <E> List<E> insert(List<E> entities) {
  if (entities == null || entities.isEmpty()) {
    return new ArrayList<>();
  }
  try {
    entityManager.executeEntityListeners(CallbackType.PRE_INSERT, entities);
    FullEntity<?>[] nativeEntities = toNativeFullEntities(entities, entityManager, Intent.INSERT);
    Class<?> entityClass = entities.get(0).getClass();
    List<Entity> insertedNativeEntities = nativeWriter.add(nativeEntities);
    List<E> insertedEntities = (List<E>) toEntities(entityClass, insertedNativeEntities);
    entityManager.executeEntityListeners(CallbackType.POST_INSERT, insertedEntities);
    return insertedEntities;
  } catch (DatastoreException exp) {
    throw DatastoreUtils.wrap(exp);
  }
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
/**
 * Updates the given entity in the Cloud Datastore. The passed in Entity must have its ID set for
 * the update to work.
 * 
 * @param entity
 *          the entity to update
 * @return the updated entity.
 * @throws EntityManagerException
 *           if any error occurs while updating.
 */
@SuppressWarnings("unchecked")
public <E> E update(E entity) {
  try {
    entityManager.executeEntityListeners(CallbackType.PRE_UPDATE, entity);
    Intent intent = (nativeWriter instanceof Batch) ? Intent.BATCH_UPDATE : Intent.UPDATE;
    Entity nativeEntity = (Entity) Marshaller.marshal(entityManager, entity, intent);
    nativeWriter.update(nativeEntity);
    E updatedEntity = (E) Unmarshaller.unmarshal(nativeEntity, entity.getClass());
    entityManager.executeEntityListeners(CallbackType.POST_UPDATE, updatedEntity);
    return updatedEntity;
  } catch (DatastoreException exp) {
    throw DatastoreUtils.wrap(exp);
  }

}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
/**
 * Updates or inserts the given list of entities in the Cloud Datastore. If the entities do not
 * have a valid ID, IDs may be generated.
 * 
 * @param entities
 *          the entities to update/or insert.
 * @return the updated or inserted entities
 * @throws EntityManagerException
 *           if any error occurs while saving.
 */
@SuppressWarnings("unchecked")
public <E> List<E> upsert(List<E> entities) {
  if (entities == null || entities.isEmpty()) {
    return new ArrayList<>();
  }
  try {
    entityManager.executeEntityListeners(CallbackType.PRE_UPSERT, entities);
    FullEntity<?>[] nativeEntities = toNativeFullEntities(entities, entityManager, Intent.UPSERT);
    Class<?> entityClass = entities.get(0).getClass();
    List<Entity> upsertedNativeEntities = nativeWriter.put(nativeEntities);
    List<E> upsertedEntities = (List<E>) toEntities(entityClass, upsertedNativeEntities);
    entityManager.executeEntityListeners(CallbackType.POST_UPSERT, upsertedEntities);
    return upsertedEntities;
  } catch (DatastoreException exp) {
    throw DatastoreUtils.wrap(exp);
  }
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
void store(Workflow workflow) throws IOException {
  storeWithRetries(() -> datastore.runInTransaction(transaction -> {
    final Key componentKey = componentKeyFactory.newKey(workflow.componentId());
    if (transaction.get(componentKey) == null) {
      transaction.put(Entity.newBuilder(componentKey).build());
    }

    final String json = OBJECT_MAPPER.writeValueAsString(workflow);
    final Key workflowKey = workflowKey(workflow.id());
    final Optional<Entity> workflowOpt = getOpt(transaction, workflowKey);
    final Entity workflowEntity = asBuilderOrNew(workflowOpt, workflowKey)
        .set(PROPERTY_WORKFLOW_JSON, StringValue.newBuilder(json).setExcludeFromIndexes(true).build())
        .build();

    return transaction.put(workflowEntity);
  }));
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
public void updateNextNaturalTrigger(WorkflowId workflowId, TriggerInstantSpec triggerSpec) throws IOException {
  storeWithRetries(() -> datastore.runInTransaction(transaction -> {
    final Key workflowKey = workflowKey(workflowId);
    final Optional<Entity> workflowOpt = getOpt(transaction, workflowKey);
    if (!workflowOpt.isPresent()) {
      throw new ResourceNotFoundException(
          String.format("%s:%s doesn't exist.", workflowId.componentId(), workflowId.id()));
    }

    final Entity.Builder builder = Entity
        .newBuilder(workflowOpt.get())
        .set(PROPERTY_NEXT_NATURAL_TRIGGER, instantToTimestamp(triggerSpec.instant()))
        .set(PROPERTY_NEXT_NATURAL_OFFSET_TRIGGER, instantToTimestamp(triggerSpec.offsetInstant()));
    return transaction.put(builder.build());
  }));
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
public Map<WorkflowId, Workflow> workflows() {
  final Map<WorkflowId, Workflow> map = Maps.newHashMap();
  final EntityQuery query = Query.newEntityQueryBuilder().setKind(KIND_WORKFLOW).build();
  final QueryResults<Entity> result = datastore.run(query);

  while (result.hasNext()) {
    final Entity entity = result.next();
    final Workflow workflow;
    try {
      workflow = OBJECT_MAPPER.readValue(entity.getString(PROPERTY_WORKFLOW_JSON), Workflow.class);
    } catch (IOException e) {
      LOG.warn("Failed to read workflow {}.", entity.getKey());
      continue;
    }
    map.put(workflow.id(), workflow);
  }

  return map;
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
void patchState(WorkflowId workflowId, WorkflowState state) throws IOException {
  storeWithRetries(() -> datastore.runInTransaction(transaction -> {
    final Key workflowKey = workflowKey(workflowId);
    final Optional<Entity> workflowOpt = getOpt(transaction, workflowKey);
    if (!workflowOpt.isPresent()) {
      throw new ResourceNotFoundException(
          String.format("%s:%s doesn't exist.", workflowId.componentId(), workflowId.id()));
    }

    final Entity.Builder builder = Entity.newBuilder(workflowOpt.get());
    state.enabled().ifPresent(x -> builder.set(PROPERTY_WORKFLOW_ENABLED, x));
    state.nextNaturalTrigger()
        .ifPresent(x -> builder.set(PROPERTY_NEXT_NATURAL_TRIGGER, instantToTimestamp(x)));
    state.nextNaturalOffsetTrigger()
        .ifPresent(x -> builder.set(PROPERTY_NEXT_NATURAL_OFFSET_TRIGGER, instantToTimestamp(x)));
    return transaction.put(builder.build());
  }));
}
 

import com.google.cloud.datastore.Entity; //导入依赖的package包/类
private Backfill entityToBackfill(Entity entity) {
  final WorkflowId workflowId = WorkflowId.create(entity.getString(PROPERTY_COMPONENT),
                                                  entity.getString(PROPERTY_WORKFLOW));

  final BackfillBuilder builder = Backfill.newBuilder()
      .id(entity.getKey().getName())
      .start(timestampToInstant(entity.getTimestamp(PROPERTY_START)))
      .end(timestampToInstant(entity.getTimestamp(PROPERTY_END)))
      .workflowId(workflowId)
      .concurrency((int) entity.getLong(PROPERTY_CONCURRENCY))
      .nextTrigger(timestampToInstant(entity.getTimestamp(PROPERTY_NEXT_TRIGGER)))
      .schedule(Schedule.parse(entity.getString(PROPERTY_SCHEDULE)))
      .allTriggered(entity.getBoolean(PROPERTY_ALL_TRIGGERED))
      .halted(entity.getBoolean(PROPERTY_HALTED));

  if (entity.contains(PROPERTY_DESCRIPTION)) {
    builder.description(entity.getString(PROPERTY_DESCRIPTION));
  }

  return builder.build();
}