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.

    LoginInfo loginInfo;
    CheckLoginResponse response;
    
    if(user!=null){
      loginInfo=new LoginInfo(LoginInfo.Status.LOGGED_IN,svc.createLogoutURL(request.getRquestUrl()),new GoogleAccount(user.getEmail(),user.getNickname()));
      DatastoreService datastore=getDatastoreService();
      TransportablePlayer localPlayer=request.getLocalPlayer();
      Key key=KeyFactory.createKey(Player.class.getSimpleName(), user.getEmail());
      String keyString=KeyFactory.keyToString(key);
      
      try{
        Entity player=datastore.get(key);
        
        if(localPlayer.getID().equals(player.getProperty(TransportablePlayer.ID_PROPERTY))){
          //the achievement has changed
          if(!player.getProperty(TransportablePlayer.ACHIEVEMENT_PROPERTY).equals(localPlayer.getEncryptedAchievements())){
            //if the date is greater than client timestamp, do download. Else, do upload

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      checkLoggedIn(user);
    }catch(IllegalStateException e){
      response=new PlayerCreatedResponse(CreateStatus.NOT_LOGGED_IN);
    }
    
    DatastoreService datastore=getDatastoreService();
    Query query=new Query(Player.class.getSimpleName()).addFilter(TransportablePlayer.ID_PROPERTY, Query.FilterOperator.EQUAL,player.getID());
    if(datastore.prepare(query).asSingleEntity()==null){
      // TransportablePlayer id is not duplicated. Create a new player
      Entity newPlayer =new Entity(KeyFactory.stringToKey(player.getKey()));
      Date createTime =new Date();
      newPlayer.setProperty(TransportablePlayer.USER_PROPERTY, user);
      newPlayer.setProperty(TransportablePlayer.ID_PROPERTY, player.getID());
      newPlayer.setProperty(TransportablePlayer.DATE_PROPERTY, createTime);
      newPlayer.setProperty(TransportablePlayer.TOTAL_PROPERTY, player.getTotal());
      newPlayer.setProperty(TransportablePlayer.ACHIEVEMENT_PROPERTY, player.getEncryptedAchievements());
      
      datastore.put(newPlayer);
      LOG.info("new player \""+player.getID()+"\" is created.");
      response=new PlayerCreatedResponse(createTime);
    }else{
      // TransportablePlayer id is duplicated. Send the status back
      response=new PlayerCreatedResponse(CreateStatus.DUPLICATED);

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  }
  
  @Override
  public Date saveAchievements(Player player) {
    checkLoggedIn();
    DatastoreService datastore=getDatastoreService();
    try{
      Date timestamp=new Date();
      Entity playerE=datastore.get(KeyFactory.stringToKey(player.getKey()));
      playerE.setProperty(TransportablePlayer.ACHIEVEMENT_PROPERTY, player.getEncryptedAchievements());
      playerE.setProperty(TransportablePlayer.TOTAL_PROPERTY, player.getTotal());
      playerE.setProperty(TransportablePlayer.DATE_PROPERTY, timestamp);
      datastore.put(playerE);
      
      LOG.info("The achievements have been saved.");
      
      return timestamp;
    }catch(EntityNotFoundException e){

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    RemoteApiInstaller installer2 = new RemoteApiInstaller();


    try
    {
      installer.install(options);
      DatastoreService ds = DatastoreServiceFactory.getDatastoreService();


      Query q = new Query("Boleto");


      Map<String, Entity> mB = new HashMap<String, Entity>();
      PreparedQuery pq = ds.prepare(q);
      Iterable<Entity> it = pq.asIterable();
      for (Entity e : it)
        mB.put((String)e.getProperty("codigo"), e);


      System.out.println("RES : " + mB.size());


      installer.uninstall();


      installer2.install(options2);
      DatastoreService dsDestino = DatastoreServiceFactory.getDatastoreService();
//      dsDestino.put(it);


      Map<String, Entity> mB2 = new HashMap<String, Entity>();
      PreparedQuery pq2 = dsDestino.prepare(q);
      Iterable<Entity> it2 = pq2.asIterable();
      for (Entity e : it2)
        mB2.put((String)e.getProperty("codigo"), e);
      System.out.println("RES : " + mB2.size());
      installer2.uninstall();

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    RemoteApiInstaller installer = new RemoteApiInstaller();


    try
    {
      installer.install(options);
      DatastoreService ds = DatastoreServiceFactory.getDatastoreService();


      Query q = new Query("Boleto");
      //q.addFilter("statusBoleto", Query.FilterOperator.EQUAL, "A");


      Map<String, Entity> mB = new HashMap<String, Entity>();
      for (Entity e : ds.prepare(q).asIterable())
        mB.put((String)e.getProperty("codigo"), e);


      System.out.println("RES : " + mB.size());


      int tUpdate2 = 0;

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                    + (session.getMaxInactiveInterval() * 1000));
            Expiration expires = Expiration.onDate(expire);


            memcache.put(id, bytes, expires);


            DatastoreService ds = DatastoreServiceFactory.getDatastoreService();
            Entity entity = new Entity(AC_BASE, id);
            entity.setProperty(PROPERTY_EXPIRES, expire.getTime());
            entity.setProperty(PROPERTY_DATA, new Blob(bytes));
            ds.put(entity);


        } catch (DeadlineExceededException e) {
            log.severe("DeadlineExceeded for " + session.getId());
            sendDeadlineExceededNotification(request, response);
        } catch (NotSerializableException e) {

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            HttpServletRequest request, MemcacheService memcache) {
        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) {
                    log.info("Vaadin cleanup deleting " + entities.size()
                            + " expired Vaadin sessions.");
                    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) {
                    log.info("Vaadin cleanup deleting " + entities.size()
                            + " expired appengine sessions.");
                    List<Key> keys = new ArrayList<Key>();
                    for (Entity e : entities) {
                        keys.add(e.getKey());
                    }
                    ds.delete(keys);
                }
            }
        } catch (Exception e) {
            log.warning("Exception while cleaning: " + getStackTraceAsString(e));
        }

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  }


  public DataEntry getEntryByID(String id) {
    // Get instance of data store controller
    DatastoreService dataStore = DatastoreServiceFactory.getDatastoreService();
    try {
      Entity data_entry = dataStore.get(KeyFactory.stringToKey(id));
      return getDataEntryFromEntity(data_entry);
    } catch (Exception e) {
      return null;
    }

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  }


  // Returns a DataEntry given an entity of kind DataEntry
  public DataEntry getDataEntryFromEntity(Entity result) {
    // Get instance of data store controller
    DatastoreService datastore = DatastoreServiceFactory
        .getDatastoreService();
    try {
      // Get the patient entity matching the passed in entity parent
      Entity patientEntity = datastore.get(result.getParent());


      // Get the high-level user entity that is the ancestor of this
      // patient entity
      Entity userEntity = datastore.get(patientEntity.getParent());


      // Populate user object with user entity properties from database
      User user = new User(userEntity.getKey().toString(),
          User.getPrivilegeLevelFromString((String) userEntity
              .getProperty("Privilege")),

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