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javaioSerializable; javarmiRemoteException; javaxejbCreateException; javaxejbEJBHome;
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/** * BenefitEnrollerHome is the home interface for our * simple benefits processing and registration system */ public interface BenefitEnrollerHome extends EJBHome { /** * Creates a registration session for a student */ BenefitEnroller create(String a_memberId) throws RemoteException, CreateException; }
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Calling the create() method eventually results in creation of a corresponding BenefitEnrollerBean instance Recall that this is a stateful session bean, so there's one per client session If we hadn't needed to maintain state, we could have chosen to implement BenefitEnrollerBean as stateless The process of bean instantiation follows the lifecycle contract defined earlier for stateful session beans The create(), setSessionContext(), and ejbCreate() methods will be called in that order by the container These methods can be implemented by the developer when she codes the bean instance class, which is the topic of the next subsection Coding the Bean Class Listing 8-3 shows one way that a stateful session bean called BenefitEnrollerBean can be written
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Listing 8-3 The BenefitEnroller Session Bean Class
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1 import javautil*; 2 import javaxejb*; 3 import javaxnaming*; 4 import javaxrmiPortableRemoteObject; 5 6 /** 7 * The BenefitEnrollerBean includes the core business logic and 8 * required SessionBean methods for our school registration system 9 */ 10 public class BenefitEnrollerBean implements SessionBean 11 { 12 String m_memberId; 13 ArrayList m_elections; 14 15 public BenefitEnrollerBean() { } 16 17 /** 18 * Creates a benefits enrollment session for specified member 19 */ 20 public void ejbCreate(String a_memberId) 21 { 22 m_memberId = a_memberId; 23 m_elections = new ArrayList(); 24 } 25 26 public void ejbRemove() { } 27 public void ejbActivate() { } 28 public void ejbPassivate() { } 29 30 public void setSessionContext(SessionContext sc) { } 31 32 /** 33 * Adds a course to current class list 34 */ 35 public void selectBenefit(String a_benefitId) 36 { 37 m_electionsadd(a_benefitId); 38 } 39 40 /** 41 * Removes a course from current class list 42 */ 43 public void deselectBenefit(String a_benefitId) 44 { 45 int idx = -1; 46 String cur; 47 48 for (int i=0; i<m_electionssize(); i++) { 49 cur = (String)m_electionsget(i);
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50 if (curequals(a_benefitId)) { 51 m_electionsremove(i); 52 break; 53 } 54 } 55 } 56 57 /** 58 * Returns the list of benefit elections, in the current order 59 */ 60 public ArrayList getBenefitList() 61 { 62 return m_elections; 63 } 64 65 /** 66 * Confirms an enrollment, returns a confirmation code 67 */ 68 public ArrayList confirmElections() 69 { 70 if (m_electionssize() == 0) 71 return null; 72 73 ArrayList bList = new ArrayList(); 74 75 try 76 { 77 Context initial = new InitialContext(); 78 79 Object objref = initiallookup( 80 "java:comp/env/ejb/MemberBenefit"); 81 82 MemberBenefitHome mbh = (MemberBenefitHome) 83 PortableRemoteObjectnarrow(objref, 84 MemberBenefitHomeclass); 85 86 MemberBenefit curMb; 87 88 for (int i=0; i<m_electionssize(); i++) 89 { 90 curMb = mbhcreate( 91 m_memberId, 92 m_electionsget(i)toString(), 93 CalendargetInstance()getTime()); 94 95 bListadd(curMb); 96 } 97 98 } catch (Exception ex) { 99 throw new EJBException("ERROR: "+exgetMessage()); 100 } 101
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102 103
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return bList; }
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In summarizing the organization and contents of this code, it's important to note the following:
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ejbCreate() methods are required for every manner in which we want our bean to be instantiated Since this is a stateful session bean, the instantiation information can be recorded in bean instance variables Lines 22 and 23, for example, show how the member ID is set and how the benefit election list is initialized The other EJB life-cycle methods, such as ejbRemove(), are required by the lifecycle contract, but don't need to be implemented For special session beans, particularly those that also interact with the database or deal with some other external resource, implementation of these methods might be required The methods shown in lines 35 through 63 are the implementations of the business methods exposed by the BenefitEnrollerRemote object shown earli-er in Listing 8-1 Notice that they simply query and manipulate instance member variables, which are associated with a logical client session The confirmEnrollment() method is interesting because it shows how a session bean can communicate with another EJB, in this case an entity bean The purpose here is to use BenefitEnroller to coordinate the creation of a set of elections, just as a shopping cart for an online store might be filled When the member is done and has confirmed elections, the session bean can coordinate its persistence with other application entity beans It achieves this persistence by repetitively using the MemberBenefitHome object as a factory to create new MemberBenefit instances
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