Examples of com.google.appengine.api.datastore.DatastoreService

Package com.google.appengine.api.datastore

Examples of com.google.appengine.api.datastore.DatastoreService

com.google.appengine.api.datastore.DatastoreService
The {@code DatastoreService} provides synchronous access to a schema-lessdata storage system. The fundamental unit of data in this system is the {@code Entity}, which has an immutable identity (represented by a {@code Key}) and zero or more mutable properties. {@code Entity}objects can be created, updated, deleted, retrieved by identifier, and queried via a combination of properties.
The {@code DatastoreService} can be used transactionally andsupports the notion of a "current" transaction. A current transaction is established by calling {@link #beginTransaction()}. The transaction returned by this method ceases to be current when an attempt is made to commit or rollback or when another call is made to {@link #beginTransaction()}. A transaction can only be current within the Thread that created it.
The various overloads of put, get, and delete all support transactions. Users of this class have the choice of explicitly passing a (potentially {@code null}) {@link Transaction} to thesemethods or relying on the behavior governed by the {@link ImplicitTransactionManagementPolicy}. If a user explicitly provides a {@link Transaction} it is up to the user to call{@link Transaction#commit()} or {@link Transaction#rollback()} atthe proper time. If a user relies on implicit transaction management and the installed policy creates a transaction, that transaction will be committed (in the case of a success) or rolled back (in the case of a failure) before the operation returns to the user. The methods that manage transactions according to {@link ImplicitTransactionManagementPolicy} are:{@link #delete(Key)}, {@link #delete(Iterable)}, {@link #get(Key)}, {@link #get(Iterable)}, {@link #put(Entity)}, and {@link #put(Iterable)}.
The overload of prepare that takes a {@link Transaction}parameter behaves the same as the overloads of put, get, and delete that take a {@link Transaction} parameter. However, the overloadof prepare that does not take a {@link Transaction} parameter,unlike put, get, and delete, does not use an existing {@link Transaction} if one is already running and does not consultthe {@link ImplicitTransactionManagementPolicy} if one is notalready running.

public class EntityRemove extends AbstractSubscriber {


  public void onMessage(Message message) {
    SimpleMessage msg = (SimpleMessage) message;
    String kind =  msg.getMessage();
    DatastoreService datastore = getBusiness().getSystemService()
              .getDatastore(); 
        Query query = new Query(kind);
        PreparedQuery results = datastore.prepare(query);
        int i = 0;
        boolean end = true;
        for (Entity entity : results.asIterable()) {
          datastore.delete(entity.getKey());
          i++;
        if (getBusiness().getSystemService()
            .getRequestCPUTimeSeconds() > 25) {
          addEntityRemoveTask(kind);
          end = false;

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    String mode =  msg.getMessage();
    if (mode != null && mode.equals("start")) {
      addSessionCleanTask();
    }
    else {
          DatastoreService datastore = getBusiness().getSystemService()
              .getDatastore(); 
          Query query = new Query("_ah_SESSION");
          query.addFilter("_expires", FilterOperator.LESS_THAN, 
              System.currentTimeMillis());
          PreparedQuery results = datastore.prepare(query);
          int i = 0;
          boolean end = true;
          for (Entity session : results.asIterable()) {
            datastore.delete(session.getKey());
            i++;
          if (getBusiness().getSystemService()
              .getRequestCPUTimeSeconds() > 25) {
            addSessionCleanTask();
            end = false;

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            MemcacheService memcache) throws ServletException {
        HttpSession session = request.getSession();
        String id = AC_BASE + session.getId();
        byte[] serializedAC = (byte[]) memcache.get(id);
        if (serializedAC == null) {
            DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
            Key key = KeyFactory.createKey(AC_BASE, id);
            Entity entity = null;
            try {
                entity = ds.get(key);
            } catch (EntityNotFoundException e) {
                // Ok, we were a bit optimistic; we'll create a new one later
            }
            if (entity != null) {
                Blob blob = (Blob) entity.getProperty(PROPERTY_DATA);

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     * continue w/ next.
     */
    private void cleanDatastore() {
        long expire = new Date().getTime();
        try {
            DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
            // Vaadin stuff first
            {
                Query q = new Query(AC_BASE);
                q.setKeysOnly();


                q.addFilter(PROPERTY_EXPIRES,
                        FilterOperator.LESS_THAN_OR_EQUAL, expire);
                PreparedQuery pq = ds.prepare(q);
                List<Entity> entities = pq.asList(Builder
                        .withLimit(CLEANUP_LIMIT));
                if (entities != null) {
                    getLogger()
                            .log(Level.INFO,
                                    "Vaadin cleanup deleting {0} expired Vaadin sessions.",
                                    entities.size());
                    List<Key> keys = new ArrayList<Key>();
                    for (Entity e : entities) {
                        keys.add(e.getKey());
                    }
                    ds.delete(keys);
                }
            }
            // Also cleanup GAE sessions
            {
                Query q = new Query(APPENGINE_SESSION_KIND);
                q.setKeysOnly();
                q.addFilter(PROPERTY_APPENGINE_EXPIRES,
                        FilterOperator.LESS_THAN_OR_EQUAL, expire);
                PreparedQuery pq = ds.prepare(q);
                List<Entity> entities = pq.asList(Builder
                        .withLimit(CLEANUP_LIMIT));
                if (entities != null) {
                    getLogger()
                            .log(Level.INFO,
                                    "Vaadin cleanup deleting {0} expired appengine sessions.",
                                    entities.size());
                    List<Key> keys = new ArrayList<Key>();
                    for (Entity e : entities) {
                        keys.add(e.getKey());
                    }
                    ds.delete(keys);
                }
            }
        } catch (Exception e) {
            getLogger().log(Level.WARNING, "Exception while cleaning.", e);
        }

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    f.bars2 = generate(Bar.class, 10);
    f.bars2[6] = null;


    Key key = os.beginSession().store(f).now();


    DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
    Entity e = ds.get(key);
    assertTrue(e.getProperty("b") instanceof Blob);
    assertTrue(e.getProperty("c") instanceof String);


    Foo f2 = os.beginSession().load(key).now();
    assertTrue(ReflectionUtils.fieldsEqual(f, f2));

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    oss.store(new Foo("Barney Rubble")).now();


    List<Foo> foos = Lists.newArrayList(oss.find(Foo.class).now());
    assertEquals(2, foos.size());


    DatastoreService service = DatastoreServiceFactory.getDatastoreService();
    List<Entity> entities = Lists.newArrayList(service.prepare(new Query("Foo")).asIterable());
    assertEquals(2, entities.size());
    for(Entity e : entities)
    {
      String name = e.getProperty("name").toString();
      assertTrue (name.equals("Fred Flintstone") || name.equals("Barney Rubble"));

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    writer.write(entity2);
    writer.write(entity3);
    writer.endSlice();
    writer.endShard();


    DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
    try {
      ds.get(entity1.getKey());
      fail("Should ot be able to find entity1");
    } catch (EntityNotFoundException ignore) {
      // expected
    }
    assertEquals(entity2, ds.get(entity2.getKey()));
    assertEquals(entity3, ds.get(entity3.getKey()));
  }

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    executeTasksUntilEmpty();
    ShardedJobState state = service.getJobState(jobId);
    assertEquals(new Status(DONE), state.getStatus());
    IncrementalTaskState<IncrementalTask> it = Iterators.getOnlyElement(service.lookupTasks(state));
    assertNull(((TestTask) it.getTask()).getPayload());
    DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
    assertEquals(2, ds.prepare(new Query()).countEntities(FetchOptions.Builder.withDefaults()));
  }

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    TestTask s1 = new TestTask(0, 2, 2, 2, bytes);
    TestTask s2 = new TestTask(1, 2, 2, 1);
    jobService.startJob("testCleanupJob", ImmutableList.of(s1, s2), controller, settings);
    assertFalse(jobService.cleanupJob("testCleanupJob"));
    executeTasksUntilEmpty();
    DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
    assertEquals(3, ds.prepare(new Query()).countEntities(FetchOptions.Builder.withDefaults()));
    assertTrue(jobService.cleanupJob("testCleanupJob"));
    executeTasksUntilEmpty();
    assertEquals(0, ds.prepare(new Query()).countEntities(FetchOptions.Builder.withDefaults()));
  }

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      super(expectedResult);
    }


    @Override
    public void completed(Iterator<TestTask> results) {
      DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
      assertEquals(7, ds.prepare(new Query()).countEntities(FetchOptions.Builder.withDefaults()));
      super.completed(results);
    }

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