barcode 128 generator vb.net 7: Enterprise JavaBeans and the EJB Container Model in Java

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7: Enterprise JavaBeans and the EJB Container Model
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// Log message to console public void log(String msg) { System.out.println(Calendar.getInstance().getTime() +":EntityCMPBean:" + msg); } }
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2. Create the CMP Entity Bean Home Interface Here is a home interface for our CMP entity bean example:
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package javaee.architect.EntityCMP; import javax.ejb.*; import java.util.*; import java.rmi.*; // This is the home interface, used by clients as a // factory for EJB objects (remote references). The EJB // container vendor implements this extended interface. // In this home interface there is a create() method that // corresponds to the ejbCreate() method in actual bean code. public interface EntityCMPRemoteHome extends javax.ejb.EJBHome { // Finder methods that return one or // more EJB Objects (remote reference). // The functionality of these finder methods // can be customized at deployment time public Collection findByName(String string) throws FinderException, RemoteException; public Collection findByDescription(String string) throws FinderException, RemoteException; public Collection findByProductPx(Double dbl) throws FinderException, RemoteException; public Collection findAllProducts() throws FinderException, RemoteException; public EntityCMPRemote findByPrimaryKey(String productId) throws FinderException, RemoteException; // Creates/returns the EJB Object (remote reference). public EntityCMPRemote create(String productId, String name, Double productPx, String description) throws CreateException, RemoteException; }
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3. Create the CMP Entity Bean Remote Interface Here is a remote interface for our CMP entity bean example. It is important to note that the following code is not supposed to demonstrate the best practice for the design of the remote interface.
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Distinguish Between Stateful and Stateless Session Beans
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An improved implementation would provide access via a session facade (see 5), which would simplify access and reduce potential network traffic.
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package javaee.architect.EntityCMP; import javax.ejb.*; import java.util.*; import java.rmi.*; // This is the remote interface, used by clients when // they need to call an EJB objects. The EJB container // vendor implements this extended interface, which is // responsible for delegating subsequent calls to the // actual bean code. public interface EntityCMPRemote extends EJBObject { // Getters and setters for Entity Bean fields. public String getProductId() throws RemoteException; public void setName(String name) throws RemoteException; public String getName() throws RemoteException; public void setProductPx(Double productPx) throws RemoteException; public Double getProductPx() throws RemoteException; public void setDescription(String description) throws RemoteException; public String getDescription() throws RemoteException; }
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4. Create Deployment Descriptors As mentioned in the first code review exercise in this chapter, the deployment descriptor, located within a JAR file, allows the properties of an EJB to be maintained outside of Java code. Here is our deployment descriptor (ejb-jar.xml) for the CMP entity session bean. You will notice some EJB Query Language (EJB QL), which defines the queries for the finder and select methods of an entity bean with CMP.
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< xml version="1.0" ><!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd"> <ejb-jar> <enterprise-beans> <entity> <display-name>EntityCMP</display-name> <ejb-name>EntityCMP</ejb-name> <home>javaee.architect.EntityCMP.EntityCMPRemoteHome</home> <remote>javaee.architect.EntityCMP.EntityCMPRemote</remote> <ejb-class>javaee.architect.EntityCMP.EntityCMPBean</ejb-class> <persistence-type>Container</persistence-type> <prim-key-class>java.lang.String</prim-key-class>
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7: Enterprise JavaBeans and the EJB Container Model
<reentrant>False</reentrant> <cmp-version>2.x</cmp-version> <abstract-schema-name>EntityCMP</abstract-schema-name> <cmp-field> <field-name>productId</field-name> </cmp-field> <cmp-field> <field-name>name</field-name> </cmp-field> <cmp-field> <field-name>productPx</field-name> </cmp-field> <cmp-field> <field-name>description</field-name> </cmp-field> <primkey-field>productId</primkey-field> <query> <query-method> <method-name>findByName</method-name> <method-params> <method-param>java.lang.String</method-param> </method-params> </query-method> <ejb-ql>WHERE name = 1</ejb-ql> </query> <query> <query-method> <method-name>findByDescription</method-name> <method-params> <method-param>java.lang.String</method-param> </method-params> </query-method> <ejb-ql>WHERE description = 1</ejb-ql> </query> <query> <query-method> <method-name>findByProductPx</method-name> <method-params> <method-param>java.lang.Double</method-param> </method-params> </query-method> <ejb-ql>WHERE productPx = 1</ejb-ql> </query>
Distinguish Between Stateful and Stateless Session Beans
<query> <query-method> <method-name>findAllProducts</method-name> <method-params /> </query-method> <ejb-ql>WHERE productId IS NOT NULL</ejb-ql> </query> </entity> </enterprise-beans> <assembly-descriptor> <container-transaction> <method> <ejb-name>EntityCMP</ejb-name> <method-name>*</method-name> </method> <trans-attribute>Required</trans-attribute> </container-transaction> </assembly-descriptor> </ejb-jar>
5. Compile, Assemble, and Deploy the CMP Entity Bean The next steps in the process are to compile, assemble, and then deploy the entity bean. In our example, the following set of steps are used to complete the process. As part of the deployment process, references in the deployment descriptor need to be resolved to actual resources in the container. How these resources are resolved is, at the moment, container specific. In the WebLogic environment, the following files can be used for the CMP Entity bean example: No, the following files above refers to the weblogic-ejb-jar.xml and weblogic-cmprdbms-jar.xml files listed below paHere s the code for the weblogic-ejb-jar.xml file:
< xml version="1.0" > <!DOCTYPE weblogic-ejb-jar PUBLIC "-//BEA Systems, Inc.//DTD WebLogic 8.1.0 EJB//EN" "http://www.bea.com/servers/wls810/dtd/weblogic-ejb-jar.dtd" > <weblogic-ejb-jar> <weblogic-enterprise-bean> <ejb-name>EntityCMP</ejb-name> <entity-descriptor> <entity-cache> <max-beans-in-cache>1000</max-beans-in-cache> </entity-cache> <persistence>
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