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Using the DTO and Session Facade wizard d Use this page to specify which fields you want included in the generated data transfer objects. Check the Include check box next to each field you want to include and uncheck the check box for those you want to omit. By default all the primary key fields are checked and you won t be able to uncheck them. Include any fields used by the business methods of your entity bean and its finders. The list box on the left will list multiple entity beans if the bean has relationships with others. Make sure you have selected each bean in the list so that you have the opportunity to include or omit each field. Click Next to go on to the next step: e JBuilder suggests names for the data transfer object assemblers and the package where they are stored. Edit these details if the default names aren t satisfactory. If your entity bean has relationships to other beans that you specified in the previous step, you ll see them listed in the box on the left. Select each bean and fill in the information for all beans. If a file with the name you specify for the data transfer object already exists, the page allows you to specify how you want the file conflict resolved. If necessary, select the resolution option you prefer. Click Next to go to the next step: f JBuilder suggests names for the session facade and the package where they will be stored. Edit these if you want to make changes. You can use the drop-down list for the Session Facade Name to select an existing session bean. This allows you to add the create, update, and delete methods of multiple entity beans to a single session bean. The box on the left lists the bean class, the remote interface and the home interface. Select each element in turn and specify the information for each. Make sure you have looked at each page to give you the chance to see 66 Developing Applications with Enterprise JavaBeans
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Using the DTO and Session Facade wizard b If the entity bean for which you are created a session facade has relationships defined to other entity beans, this page appears in the wizard: In the list of relationships on this page, check the Include check box to specify which relationships you want the session facade to know about. Click Next to go to the next step: c JBuilder suggests names for the data transfer objects (DTOs) and the package where they are stored. Edit these details if the default names aren t satisfactory. If your entity bean has relationships to other beans that you specified in the previous step, you ll see them listed in the box on the left. Select each bean and fill in the information for all beans. If a file with the name you specify for the data transfer object already exists, the page allows you to specify how you want the file conflict resolved by enabling the conflict resolution options. If necessary, select the resolution option you prefer. You ll see these options on other pages of the wizard. Whenever they are enabled, you must select how you want the conflict resolved. Click Next to go to the next step: Chapter 7: Creating session facades for entity beans 65
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Using the DTO and Session Facade wizard Using the DTO and Session Facade wizard The wizard can generate these types of classes: DTOs Data transfer objects. Their purpose is to pass information into and out of the EJB layer. One DTO is created for the bean the facade is created for, and additional DTOs are created for all beans with relationships to the initial bean. DTOs are sometimes referred to as Transfer Objects and other times as Value Objects. DtoAssemblers Factory classes that assemble DTOs from beans. They require a bean and use its data to populate a DTO. ServiceLocator A single class used to make looking up EJB home interfaces easier. You might need to edit the getInitialContext() method or make a subclass if you need to make a custom initial context for a particular application server. SessionFacade A stateless session bean used to interact with an entity bean. It contains methods for creating, retrieving, updating, and deleting instances of the entity bean. Business Delegate A delegate file created so you can call the methods of the session facade without having to know about EJBs or application servers. This is the primary class that clients will use to access and interact with entity bean data. When you write a test client, you can just use the business delegate to interact with the EJBs, which should make using EJBs easier. A Struts web client, which demonstrates the simple usage of the Business Delegate and its use in Struts. For information about Struts, see Using the Struts framework in JBuilder in Developing Web Applications. To create data transfer objects and a session facade for an entity bean, 1 Right-click a 2.0 CMP or BMP entity bean in the EJB designer. 2 Choose DTO/Facade Wizard on the context menu to display the wizard: 3 Work through the steps of the wizard: a The first page of the wizard allows you to specify whether you just want to create a stateless session facade for the entity bean, to generate a business delegate, and to also generate a Struts web client that uses the generated business delegate. Which pages appear in the wizard depend on which files you select to generate on this page. Click Next to go to the next step. 64 Developing Applications with Enterprise JavaBeans
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Chapter 7 Creating session facades for entity beans When you are designing your EJB applications, it s a good idea to avoid having an EJB client directly access your entity beans. There are at least two very good reasons for this: Each time the client requests data from an entity bean, an RMI-IIOP network call is made. If, for example, the client requests the customer s ID number and the customer s name, two network calls are required. With multiple entity beans and many data requests, your runtime performance can slow markedly. A client that accesses an entity bean directly must know the entity bean s implementation intimately. The client and the entity beans it calls are tightly coupled, which means changes you make in the entity bean will affect the client, too. A popular solution is to use the Session Facade design pattern in which session facades intercede between the client and the entity beans. The client sends requests to the session facade, which forwards the request to the appropriate entity bean. A session facade doesn t do work itself, but delegates the work to other objects. A session facade provides a simple interface. It is the client interface to the underlying system, encapsulating specific knowledge and not exposing it unnecessarily. You can read about the Session Facade design pattern on the Web. Here are some links to get you started: Core J2EE Pattern Session Facade at http://java.sun.com/blueprints/ corej2eepatterns/Patterns/SessionFacade.html EJB Best Practices: Entity Bean Projection at http://www-106.ibm.com/ developerworks/java/library/j-ejb1008.html Best Practices to Improve Performance Using Patterns in J2EE at http://www.precisejava.com/javaperf/j2ee/Patterns.htm Rules and Patterns for Session Facades at http://www7b.software.ibm.com/wsdd/ library/techarticles/0106_brown/sessionfacades.html JBuilder can help you create stateless session facades and data transfer objects (DTOs) for your entity beans using the DTO And Session Facade wizard. Note The DTO And Session Facade wizard is enabled for EJB 2.0 entity beans only. Chapter 7: Creating session facades for entity beans 63
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62 Developing Applications with Enterprise JavaBeans
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Creating entity beans with bean-managed persistence Creating entity beans with bean-managed persistence The EJB designer can also help you create bean-managed persistence (BMP) entity beans: 1 Right-click the EJB designer pane. 2 Choose Create EJB|BMP Entity Bean or click the Create EJB icon on the EJB designer toolbar and choose BMP Entity Bean on the menu that appears. Design your BMP bean as you would other beans by adding methods and fields and adding necessary logic. Unlike CMP entity beans, you must then add code to manage the bean s persistence. Chapter 6: Creating entity beans with the EJB designer 61
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Creating a schema from entity beans 6 Enter an EJB QL statement. An EJB QL query is a string that must contain a SELECT clause and a FROM clause, and may include a WHERE clause. Some select method s inspector may have additional fields, depending on your target application server. If you need help filling in these additional fields, consult your application server s documentation. For more information about writing queries with the EJB 2.0 query language, see Enterprise JavaBeans Query Language in the J2EE tutorial on the Sun web site at http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/EJBQL.html. Also consult your application server documentation. Adding a home business method Note Only EJB 2.0 components can have home business methods. EJB 2.0 components (both CMP and BMP) can have business methods, also called ejbHome methods, declared in the home interface. To create a home business method, 1 Right-click the entity bean representation in the EJB designer and choose Add| Method or click the Add icon on the toolbar and choose Method on the menu that appears. 2 Specify the name of the method, its return type, and its parameters as you would when creating any other method using the method s inspector. 3 Specify the Interface value as Home, Local Home, or Home/Local Home. When you specify a home interface, the EJB designer declares the method in the home interface(s) you specified with the method name you specified. It also adds the method to the bean class with a prefix of ejbHome. Like other business methods, you must then add the logic required to implement the ejbHome method in the bean class. Creating a schema from entity beans You can use an entity bean in the EJB designer to create a schema to add to a data source in the structure pane. To create a schema from entity beans, 1 Select the entity bean(s) you want to use to create a schema. 2 Right-click the EJB designer pane and choose Create Schema From Selection or click the Create Schema From Selection icon on the toolbar. 3 Select the data source you want the schema added to and choose OK. Exporting a data source If you ve modified a data source, you might want to use it to create database tables that reflect the changes you ve made. Right-click the data source s node in the structure pane and choose Export To SQL DDL (Data Definition Language.) In the dialog box that appears, specify a name for the file. You can then use that file to create a database that uses your modified data source. 60 Developing Applications with Enterprise JavaBeans
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Creating CMP entity beans from an imported data source To add a finder to a 1.1 entity bean, 1 Right-click the name of the bean in the bean representation in the EJB designer and choose Add|Finder on the context menu that appears or click the Add icon on the toolbar and choose Finder. A new finder method appears at the bottom of the bean along with the finder s inspector. 2 Use the inspector to give the finder a new name. 3 Choose whether the finder should return an instance of the bean or java.util.Collection. By default, JBuilder inserts the name of the bean s remote interface. 4 Specify the parameters passed to the finder, giving both the data types and the parameter names as the value of Input Parameters. For example, java.lang.String lastName. 5 Accept the default value of Home as the Home Interface. 6 In the Where Clause box, specify the SQL Where clause to return the entities that you want. Adding an ejbSelect method Note Only EJB 2.0 components can have ejbSelect methods. EJB QL is also used to create abstract ejbSelect() methods. Such methods allow you to use EJB QL to find objects or values related to the state of an entity bean without exposing the results to the client. To add an ejbSelect() method, 1 Right-click the name of the bean in the bean representation in the EJB designer and choose Add|Select on the context menu that appears. A new select method appears at the bottom of the bean along with the method s inspector. 2 Use the inspector to give the method a new name. The EJB designer will add a prefix of ejbSelect to the method name you specify. For example, if you specify the name AllLineItems in the inspector, the EJB designer places an abstract ejbSelectAllLineItems() method in the bean class. 3 Specify whether the method should return an instance of the bean, a java.util.Collection, or java.util.Set. By default, JBuilder inserts the remote or locale interface of the bean, depending on whether the bean is declared as remote or local. 4 Specify the parameters passed to the ejbSelect() method, giving both the data type and the parameter name as the value of Input Parameters. For example, java.lang.String lastName. 5 Select a mapping from the Result Type Mapping drop-down list. Chapter 6: Creating entity beans with the EJB designer 59
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Creating CMP entity beans from an imported data source Adding a finder method Finder methods allow the client to access the results of an EJB QL query. EJB QL is the query language for container-managed persistence query methods defined in the EJB 2.0 specification. An EJB QL query is a string that must contain a SELECT clause and a FROM clause, and may include a WHERE clause. To add a finder method to a CMP 2.0 entity bean, 1 Right-click the name of the bean in the bean representation in the EJB designer and choose Add|Finder on the context menu that appears or click the Add icon on the toolbar and choose Finder. A new finder method appears at the bottom of the bean along with the finder s inspector. 2 Use the inspector to give the finder a new name. 3 Choose whether the finder should return an instance of the bean or java.util.Collection. By default, JBuilder inserts the name of the bean. 4 Specify the parameters passed to the finder, giving both the data types and the parameter names as the value of Input Parameters. For example, java.lang.String lastName. 5 Specify whether the finder should be declared in the home or local home interface or both in the Home Interfaces field. Your choices are limited by whether the bean is declared as local or remote. 6 Specify the load state as true or false, using the drop-down list. 7 If you choose to enter a query, enter an EJB QL statement in the Query field. For example, SELECT DISTINCT OBJECT(o) FROM Order AS o, IN(o.lineItems) AS 1 WHERE 1.shipped = FALSE Some application servers also permit you to use proprietary extensions. Check your application server documentation for more information about specifying queries. The finder s inspector may have additional fields, depending on the selected application server. If you need help filling in these additional fields, consult your application server documentation. For more information about writing queries with the EJB 2.0 query language, see Enterprise JavaBeans Query Language in the J2EE tutorial on the Sun web site at http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/EJBQL.html. 58 Developing Applications with Enterprise JavaBeans
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Creating CMP entity beans from an imported data source If you specified Many To Many as the value of the Multiplicity field, the editor looks like this: In this case, you select the table in the middle that contains the columns that join the other two tables. Then click and drag between the columns to establish the relationship: Improving performance in large projects with many relationships If your project is quite large with many defined relationships, you might want to stop JBuilder from attempting to find the best route when it draws relationship lines as you work with the EJB designer. Doing so can improve performance. Choose Tools| Preferences, select EJB designer in the tree to display the EJB designer page, and uncheck the Route Relationship Lines option, which is on by default. Removing a relationship To remove a relationship between two entity beans, right-click the new field that was added to the entity bean when the relationship was created and choose Delete Relationship on the context menu. Chapter 6: Creating entity beans with the EJB designer 57
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