package com.google.devrel.training.conference.servlet;
import static com.google.devrel.training.conference.service.OfyService.ofy;
import com.google.appengine.api.memcache.MemcacheService;
import com.google.appengine.api.memcache.MemcacheServiceFactory;
import com.google.common.base.Joiner;
import com.google.devrel.training.conference.Constants;
import com.google.devrel.training.conference.domain.Conference;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* A servlet for putting announcements in memcache.
*/
public class SetAnnouncementServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// Query for conferences with less than 5 seats lef
Iterable<Conference> iterable = ofy().load().type(Conference.class)
.filter("seatsAvailable <", 5)
.filter("seatsAvailable >", 0);
List<String> conferenceNames = new ArrayList<>(0);
for (Conference conference : iterable) {
conferenceNames.add(conference.getName());
}
if (conferenceNames.size() > 0) {
StringBuilder announcementStringBuilder = new StringBuilder(
"Last chance to attend! The following conferences are nearly sold out: ");
Joiner joiner = Joiner.on(", ").skipNulls();
announcementStringBuilder.append(joiner.join(conferenceNames));
MemcacheService memcacheService = MemcacheServiceFactory.getMemcacheService();
memcacheService.put(Constants.MEMCACHE_ANNOUNCEMENTS_KEY,
announcementStringBuilder.toString());
}
response.setStatus(204);
}
}