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CHAPTER 5 BUSINESS SERVICES WITH JBOSS
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<many-to-one class="User" name="User" > <column name="FK_USER_ID" /> </many-to-one> <many-to-one class="Session" name="Session" > <column name="FK_SESSION_ID" /> </many-to-one> <set inverse="true" name="Reminders"> <key column="FK_SCHEDULEENTRY_ID" /> <one-to-many class="Reminder" /> </set> </class> </hibernate-mapping> Now we can move to the implementation of the required DAOs. The Schedule Service needs three DAOs to accomplish its work; the ScheduleDAO, PresentationDAO, and UserDAO. The ScheduleDAO implementation is shown in Listing 5-22. Listing 5-22. ScheduleDAOBean: An EJB3-Hibernate DAO Implementation package com.integrallis.techconf.ejb.dao.hibernate; import import import import import import java.util.List; javax.ejb.Stateless; com.integrallis.techconf.dao.ScheduleDAO; com.integrallis.techconf.domain.Reminder; com.integrallis.techconf.domain.ScheduleEntry; com.integrallis.techconf.domain.User;
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@Stateless public class ScheduleDAOBean extends BaseAbstractDAO implements ScheduleDAO { public ScheduleDAOBean() {} public ScheduleEntry saveScheduleEntry(ScheduleEntry scheduleEntry) { saveEntity(scheduleEntry); return scheduleEntry; } public ScheduleEntry updateScheduleEntry(ScheduleEntry scheduleEntry) { updateEntity(scheduleEntry); return scheduleEntry; }
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CHAPTER 5 BUSINESS SERVICES WITH JBOSS
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public void deleteScheduleEntry(ScheduleEntry scheduleEntry) { deleteEntity(scheduleEntry); } public void deleteScheduleEntry(int scheduleEntryId) { deleteEntityById(ScheduleEntry.class, scheduleEntryId); } @SuppressWarnings("unchecked") public List<ScheduleEntry> getScheduleEntriesForUser(int userId) { return findFiltered(ScheduleEntry.class, ScheduleEntry.PROP_USER, new User(userId)); } public ScheduleEntry getScheduleEntryById(int scheduleEntryId) { return (ScheduleEntry) getEntityById(ScheduleEntry.class, scheduleEntryId); } public Reminder saveReminder(Reminder reminder) { saveEntity(reminder); return reminder; } public Reminder updateReminder(Reminder reminder) { updateEntity(reminder); return reminder; } public void deleteReminder(Reminder reminder) { deleteEntity(reminder); } public void deleteReminder(int reminderId) { deleteEntityById(Reminder.class, reminderId); } @SuppressWarnings("unchecked") public List<Reminder> getRemindersForScheduleEntry(int scheduleEntryId) { return findFiltered(Reminder.class, Reminder.PROP_SCHEDULE_ENTRY, new ScheduleEntry(scheduleEntryId)); } @SuppressWarnings("unchecked") public List<Reminder> getRemindersForUser(int userId) { return findFiltered(Reminder.class, Reminder.PROP_USER, new User(userId)); } }
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CHAPTER 5 BUSINESS SERVICES WITH JBOSS
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As you can see in Listing 5-22, the DAO implementation becomes fairly simple by using the utility methods provided in the abstract DAO base class. Notice that in the methods that take the name of any property of a POJO, I ve added utility final static String fields to the POJOs in order to minimize the possibility of errors as shown in the getScheduledEntryForUser, getRemindersForScheduleEntry, and getRemindersForUser methods. Now that we have all the constituents in place, we can assemble the ScheduleService implementation as shown in Listing 5-23. The DynaDTO builder factory is injected as shown before using the @Resource annotation, and the DAOs are injected using the @EJB annotation. The @EJB annotation is used to inject EJB stubs. It replaces the cumbersome lookup code previously needed with EJB 2.X. In the ScheduleServiceBean class I decided to use EJB stub injection using a class field, but like most dependency-injection facilities, it can also be applied to setter methods. For example, the field scheduleDAO is of type ScheduleDAO, which happens to be the local interface of the ScheduleDAOBean. At runtime the container will look up the stub for the ScheduleDAOBean and inject it into the ScheduleServiceBean.
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Note In situations when there are multiple bean implementations of a service interface, the @EJB
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annotation can take attributes to specify how the EJB container locates the specific bean instance.
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Listing 5-23. ScheduleServiceBean: An EJB3 SLSB Service package com.integrallis.techconf.ejb; ... @Stateless public class ScheduleServiceBean implements ScheduleService { @Resource(name = "java:/dynadto/BuilderFactory") protected BuilderFactory builderFactory; @PostConstruct public void initialization() { // constructs the DynaDTO builders scheduleEntryInfoBuilder = builderFactory .getBuilder(ScheduleEntryInfo.class); reminderInfoBuilder = builderFactory.getBuilder(ReminderInfo.class); } // DAOs @EJB protected ScheduleDAO scheduleDAO; @EJB protected PresentationDAO presentationDAO; @EJB protected UserDAO userDAO;
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CHAPTER 5 BUSINESS SERVICES WITH JBOSS
// DynaDTO Builders protected Builder scheduleEntryInfoBuilder; protected Builder reminderInfoBuilder; public ScheduleEntryInfo scheduleSessionForUser(Integer userId, Integer sessionId) { // look up the Session Session session = presentationDAO.getSessionById(sessionId); Presentation presentation = session.getPresentation(); User user = userDAO.getUserById(userId); String name = presentation.getAbstract().getTitle(); String description = "In room " + session.getRoom().getName() + " starting at " + session.getDateTimeBegin(); ScheduleEntry scheduleEntry = new ScheduleEntry(); scheduleEntry.setName(name); scheduleEntry.setDescription(description); scheduleEntry.setSession(session); scheduleEntry.setUser(user); scheduleDAO.saveScheduleEntry(scheduleEntry); return (ScheduleEntryInfo) scheduleEntryInfoBuilder.build(scheduleEntry); } public void unscheduleSessionForUser(Integer scheduleEntryId) { scheduleDAO.deleteScheduleEntry(scheduleEntryId); } @SuppressWarnings("unchecked") public List<ScheduleEntryInfo> getScheduleForUser(Integer userId) { List<ScheduleEntry> entities = scheduleDAO.getScheduleEntriesForUser(userId); return scheduleEntryInfoBuilder.buildList(entities); } public ReminderInfo createReminder(Integer scheduleEntryId, Date dateTime, String message) { ScheduleEntry scheduleEntry = new ScheduleEntry(); scheduleEntry.setId(scheduleEntryId); Reminder reminder = new Reminder(); reminder.setDateAndTime(dateTime); reminder.setMessage(message); reminder.setScheduleEntry(scheduleEntry);
CHAPTER 5 BUSINESS SERVICES WITH JBOSS
scheduleDAO.saveReminder(reminder); return (ReminderInfo) reminderInfoBuilder.build(reminder); } } The DynaDTO builders for the two DTO interfaces are constructed in the initialization method, which is marked with the annotation @PostConstruct, which is called right after instantiation. The methods in the service implementation look up Hibernate-mapped domain objects using the DAOs, perform certain business logic, and finally return DTOs. As you can see, using the DAO and DTO patterns (with the help of DynaDTO) makes the service implementation deal mainly with business logic while minimizing the amount of plumbing code required.
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