By Gail Anderson
This e-book simplifies the construction of well-designed firm functions utilizing the upgraded company JavaBeans 2.0 specification. skilled Java platform mentors Gail Anderson and Paul Anderson use particular code examples to introduce each key ability occupied with developing elements, stand-alone Java platform consumers, and JavaServer Pages API consumers. They introduce robust EJB platform layout styles, and convey easy methods to observe them in real-world tasks whereas fending off severe mistakes in software layout. utilizing genuine enterprise parts, the authors express tips to utilize those key EJB part structure beneficial properties: Stateless and stateful consultation beans Entity beans with bean-managed endurance Entity beans with container-managed patience Container-managed relationships neighborhood and distant interfaces The firm JavaBeans question Language EJB 2.0 specification message pushed beansEach bankruptcy incorporates a "Design instructions and styles" part designed that will help you check tradeoffs linked to your layout judgements, and key element summaries that tie jointly very important thoughts. briefly, Anderson and Anderson offer you every thing you want to construct EJB 2.0 platform functions with greatest robustness, scalability, and function.
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Additional info for Enterprise JavaBeans™ Component Architecture: Designing and Coding Enterprise Applications
1. Naming Conventions for EJB Class and Interface Names EJB Class/Interface Name Example Remote Interface Bean Loan Name Home Interface Bean LoanHome Name + Home Bean Implementation Class Bean LoanBean Name + Bean Figure 3-2 shows a class diagram of the standard EJB interfaces as well as the classes and interfaces that we write to form the Loan EJB. Interface LoanHome is the home interface extending interface EJBHome. Interface Loan is the remote interface extending interface EJBObject and contains the business methods for our Loan EJB.
Thus, we make sure that the Calendar object referred by a LoanVO object is not modified, except through its setter, setStartDate(). PaymentVO Class Recall that in the Loan remote interface, business methods annualAmortTable() and monthlyAmortTable() return ArrayList. Both methods actually return an ArrayList collection of PaymentVO value objects that encapsulate payment data. Like value object LoanVO, PaymentVO is a convenient way to return the payment schedule within a collection. By returning all the data in a collection, we reduce the number of remote calls required to retrieve payment data.
Clients access the create() method through the home interface but call the business methods through the enterprise bean's remote interface. Our Loan EJB has three business methods that must appear in the remote interface. Method monthlyPayment() returns the monthly payment including principal and interest. The monthlyAmortTable() method produces a month-by-month payment table for the loan. Method annualAmortTable() produces a year-by-year payment schedule. java for the Loan remote interface, which extends the EJBObject interface.