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package org.traccar.web.server.model;
import java.util.Date;
import java.util.LinkedList;
import java.util.List;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.persistence.EntityManager;
import javax.persistence.Persistence;
import javax.persistence.TypedQuery;
import javax.servlet.ServletException;
import javax.servlet.http.HttpSession;
import org.traccar.web.client.model.DataService;
import org.traccar.web.shared.model.Device;
import org.traccar.web.shared.model.Position;
import org.traccar.web.shared.model.User;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
public class DataServiceImpl extends RemoteServiceServlet implements DataService {
private static final long serialVersionUID = 1;
private static final String PERSISTENCE_DATASTORE = "java:/DefaultDS";
private static final String PERSISTENCE_UNIT_DEBUG = "debug";
private static final String PERSISTENCE_UNIT_RELEASE = "release";
private static final String ATTRIBUTE_USER = "user";
private EntityManager entityManager;
@Override
public void init() throws ServletException {
super.init();
String persistenceUnit;
try {
Context context = new InitialContext();
context.lookup(PERSISTENCE_DATASTORE);
persistenceUnit = PERSISTENCE_UNIT_RELEASE;
} catch (NamingException e) {
persistenceUnit = PERSISTENCE_UNIT_DEBUG;
}
entityManager = Persistence.createEntityManagerFactory(persistenceUnit).createEntityManager();
}
@Override
public void destroy() {
entityManager.close();
super.destroy();
}
private void setUser(User user) {
HttpSession session = getThreadLocalRequest().getSession();
session.setAttribute(ATTRIBUTE_USER, user);
}
private User getUser() {
HttpSession session = getThreadLocalRequest().getSession();
return (User) session.getAttribute(ATTRIBUTE_USER);
}
@Override
public boolean authenticated() {
return (getUser() != null);
}
@Override
public boolean authenticate(String login, String password) {
TypedQuery<User> query = entityManager.createQuery(
"SELECT x FROM User x WHERE x.login = :login", User.class);
query.setParameter("login", login);
List<User> results = query.getResultList();
if (!results.isEmpty() && password.equals(results.get(0).getPassword())) {
setUser(results.get(0));
return true;
}
return false;
}
@Override
public boolean register(String login, String password) {
User user = new User();
user.setLogin(login);
user.setPassword(password);
entityManager.getTransaction().begin();
try {
entityManager.persist(user);
} finally {
entityManager.getTransaction().commit();
}
setUser(user);
return true;
}
@Override
public List<Device> getDevices() {
User user = getUser();
List<Device> devices = new LinkedList<Device>();
devices.addAll(user.getDevices());
return devices;
}
@Override
public Device addDevice(Device device) {
User user = getUser();
entityManager.getTransaction().begin();
try {
entityManager.persist(device);
user.getDevices().add(device);
} finally {
entityManager.getTransaction().commit();
}
return device;
}
@Override
public Device updateDevice(Device device) {
entityManager.getTransaction().begin();
try {
device = entityManager.merge(device);
} finally {
entityManager.getTransaction().commit();
}
return device;
}
@Override
public Device removeDevice(Device device) {
User user = getUser();
entityManager.getTransaction().begin();
try {
device = entityManager.merge(device);
user.getDevices().remove(device);
entityManager.remove(device);
} finally {
entityManager.getTransaction().commit();
}
return device;
}
@Override
public List<Position> getPositions(Device device, Date from, Date to) {
List<Position> positions = new LinkedList<Position>();
TypedQuery<Position> query = entityManager.createQuery(
"SELECT x FROM Position x WHERE x.device = :device AND x.time BETWEEN :from AND :to", Position.class);
query.setParameter("device", device);
query.setParameter("from", from);
query.setParameter("to", to);
positions.addAll(query.getResultList());
return positions;
}
@Override
public List<Position> getLatestPositions() {
List<Position> positions = new LinkedList<Position>();
User user = getUser();
if (!user.getDevices().isEmpty()) {
TypedQuery<Position> query = entityManager.createQuery(
"SELECT x FROM Position x WHERE (x.device, x.time) IN (" +
"SELECT y.device, MAX(y.time) FROM Position y WHERE y.device IN :devices GROUP BY y.device)", Position.class);
query.setParameter("devices", user.getDevices());
positions.addAll(query.getResultList());
}
return positions;
}
}
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