package com.fms.kccc.service;
import static com.google.appengine.api.taskqueue.TaskOptions.Builder.withUrl;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.logging.Logger;
import com.fms.kccc.controller.HomeServlet;
import com.fms.kccc.controller.SendMessageServlet;
import com.fms.kccc.dao.ImageContentDAO;
import com.fms.kccc.dao.ImageContentDAOImpl;
import com.fms.kccc.object.ImageContent;
import com.fms.kccc.server.Datastore;
import com.google.appengine.api.taskqueue.Queue;
import com.google.appengine.api.taskqueue.QueueFactory;
import com.google.appengine.api.taskqueue.TaskOptions;
import com.google.appengine.api.taskqueue.TaskOptions.Method;
public class ImageContentServiceImpl implements ImageContentService {
protected final Logger logger = Logger.getLogger(getClass().getName());
ImageContentDAO imageContentDAO = new ImageContentDAOImpl();
@Override
public void addNewImageContent(ImageContent imageContent) {
imageContentDAO.add(imageContent);
sendNotification();
}
@Override
public List<ImageContent> getImageContents(String category, int page,
int rows) {
// TODO Auto-generated method stub
return imageContentDAO.getImageContents(category, page, rows);
}
private void sendNotification() {
List<String> devices = Datastore.getDevices();
String status;
if (devices.isEmpty()) {
status = "Message ignored as there is no device registered!";
} else {
Queue queue = QueueFactory.getQueue("gcm");
// NOTE: check below is for demonstration purposes; a real
// application
// could always send a multicast, even for just one recipient
if (devices.size() == 1) {
// send a single message using plain post
String device = devices.get(0);
queue.add(withUrl("/send").param(
SendMessageServlet.PARAMETER_DEVICE, device));
status = "Single message queued for registration id " + device;
} else {
// send a multicast message using JSON
// must split in chunks of 1000 devices (GCM limit)
int total = devices.size();
List<String> partialDevices = new ArrayList<String>(total);
int counter = 0;
int tasks = 0;
for (String device : devices) {
counter++;
partialDevices.add(device);
int partialSize = partialDevices.size();
if (partialSize == Datastore.MULTICAST_SIZE
|| counter == total) {
String multicastKey = Datastore
.createMulticast(partialDevices);
logger.fine("Queuing " + partialSize
+ " devices on multicast " + multicastKey);
TaskOptions taskOptions = TaskOptions.Builder
.withUrl("/send")
.param(SendMessageServlet.PARAMETER_MULTICAST,
multicastKey).method(Method.POST);
queue.add(taskOptions);
partialDevices.clear();
tasks++;
}
}
status = "Queued tasks to send " + tasks
+ " multicast messages to " + total + " devices";
}
}
logger.info(status);
}
@Override
public List<ImageContent> getMarkedImageContents(String category,
Date date, int page, int rows) {
return imageContentDAO.getMarkedImageContents(category, date, page, rows);
}
}