/*
* Copyright 2014 Google Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.samples.apps.iosched.server.gcm.db;
import com.google.samples.apps.iosched.server.gcm.db.models.MulticastMessage;
import java.util.List;
import java.util.logging.Logger;
import static com.google.samples.apps.iosched.server.gcm.db.OfyService.ofy;
/**
* Simple implementation of a data store using standard Java collections.
* <p>
* This class is neither persistent (it will lost the data when the app is
* restarted) nor thread safe.
*/
public final class MessageStore {
private static final Logger LOG = Logger.getLogger(MessageStore.class.getName());
private MessageStore() {
throw new UnsupportedOperationException();
}
/**
* Creates a persistent record with the devices to be notified using a
* multicast message.
*
* @param devices registration ids of the devices
* @param type message type
* @param extraData additional message payload
* @return ID for the persistent record
*/
public static Long createMulticast(List<String> devices,
String type,
String extraData) {
LOG.info("Storing multicast for " + devices.size() + " devices. (type=" + type + ")");
MulticastMessage msg = new MulticastMessage();
msg.setDestinations(devices);
msg.setAction(type);
msg.setExtraData(extraData);
ofy().save().entity(msg).now();
Long id = msg.getId();
LOG.fine("Multicast ID: " + id);
return id;
}
/**
* Gets a persistent record with the devices to be notified using a
* multicast message.
*
* @param id ID for the persistent record
*/
public static MulticastMessage getMulticast(Long id) {
return ofy().load().type(MulticastMessage.class).id(id).now();
}
/**
* Updates a persistent record with the devices to be notified using a
* multicast message.
*
* @param id ID for the persistent record.
* @param devices new list of registration ids of the devices.
*/
public static void updateMulticast(Long id, List<String> devices) {
MulticastMessage msg = ofy().load().type(MulticastMessage.class).id(id).now();
if (msg == null) {
LOG.severe("No entity for multicast ID: " + id);
return;
}
msg.setDestinations(devices);
ofy().save().entity(msg);
}
/**
* Deletes a persistent record with the devices to be notified using a
* multicast message.
*
* @param id ID for the persistent record.
*/
public static void deleteMulticast(Long id) {
ofy().delete().type(MulticastMessage.class).id(id);
}
}