Spring Security - Third Edition

Data access objects in MongoDB

In our EventDao interface, we are required to create a new Event object. With JPA, we can have our object ID automatically generated. With MongoDB, there are several ways to assign primary key identifiers, but for the sake of this demonstration, we are just going to use an atomic counter, as follows:

    //src/main/java/com/packtpub/springsecurity/dataaccess/MongoEventDao.java    ...    import java.util.concurrent.atomic.AtomicInteger;    @Repository    public class MongoEventDao implements EventDao {      // Simple Primary Key Generator       private AtomicInteger eventPK = new AtomicInteger(102);       ...       @Override       public int createEvent(Event event) {           ...           // Get the next PK instance           event.setId(eventPK.incrementAndGet()); Event newEvent ...