Java Enterprise Services. J2EE Technology Architecture. From Abstractions to Implementations. Component-Based Software Engineering

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1 Component-Based Software Engineering From Abstractions to Implementations ECE493-Topic 4 Winter 2006 Lecture 16 Java Enterprise (Part A) Ladan Tahvildari Assistant Professor Dept. of Elect. & Comp. Eng. University of Waterloo Abstract views (PIM, Written in UML) Domain-specific Models (PSM, Written in UML with extra notation) Enterprise Middleware Architecture Abstract system architecture Safety Critical Architecture Embedded System Architecture Implementations OO: simple Java:.NET: EJB, COM+, CORBA C JMS, JSP ASP 2 Java Enterprise Services Sun Microsystems provides specifications for a comprehensive suite of technologies to solve large scale distributed system problems This suite is the Java 2 Enterprise Edition, commonly known as J2EE which offers a suite of software specification to: Design, develop, assemble and deploy enterprise applications February Discuss 28, 2006 the architecture of J2EE and how it can be used to develop distributed multi-tiered 3 J2EE Technology Architecture Application clients Server platform IIOP, others Java Server pages Enterprise Java Beans Components html Web clients Servlets JTS JMAPI JNDI JMS JAXP JDBC JAAS 4

2 J2EE Suite XML Technology The Java API for XML Processing (JAXP) The Java API for XML-based RPC (JAX-RPC) SOAP with Attachments API for Java (JAAS) The Java API for XML Registries (JAXR) Web Technology Java Servlets JavaServer Pages (JSP) Enterprise Java Bean (EJB) Technology Session beans Entity beans Message-driven beans Platform Services Transactions Java Message Service J2EE-Based Application The J2EE APIs enable distributed systems and applications through the following: Unified application model across tiers with enterprise beans Simplified response and request mechanism with JSP pages and servlets Reliable security model with JAAS XML-based data interchange integration with JAXP Simplified interoperability with the J2EE Connector Architecture Easy database connectivity with the JDBC API Enterprise application integration with message-driven beans and JMS, JTA, and JNDI 5 6 Enterprise Application Model Distributed Multi-tiered Applications Services, clients (people and application) and data are distributed geographically across many platforms and many machines. Multiple tiers: Client-tier (browser or client-application) Web-tier (web-server: Java Server Pages) Business-tier (logic; Examples: Enterprise Java Beans) Enterprise-Information-System (EIS) tier (database) 7 8

3 J2EE Clients Web Clients Dynamic web pages with HTML, rendered by web browsers Can include applets Communicates with server typically using HTTP Application Clients User interface using GUI components such as Swing Directly accesses the business logic tier Web-tier Components Client can communicate with the business tier either directly or through servlets of JSP that are located in the web-tier Web-tier can help in pre-processing and allows distribution of the functionality Servlets are special classes to realize the request-response model (get, post of HTTP) JSP is a developer-friendly wrapper over the servlet classes 9 10 Business-tier Components This is defined by the logic that pertains to the (business) application that is being developed Enterprise Java Beans (EJB) can be used to implement this tier This tier receives the data from the web-tier and processes the data and sends it to the EIS-tier and takes the data from the EIS and sends it to the web-tier Enterprise Information System Tier In general this corresponds to the database (relational database) and other information management system The other information management systems may include Enterprise Resource Planning (ERP) and legacy system connected through open database connectivity 11 12

4 Enterprise Java Beans Application Server - Architecture Enterprise Java Beans ( EJB ) is amiddleware component model for Java aspecification for creating server-side, scalable, transactional, multi-user and secure enterprise-level applications Presentation HTML Application Java Application Business Logic Data Access Presented by Sun in the 1999, they are easier than other technologies as RMI or CORBA J2EE Application Server Java versus.net for the Enterprise Java 2 Enterprise Edition standardizes interfaces for Application Server components.net COM+ Components Transactions Loosely Coupled Events Queued Components Object Pooling JIT Activation ASP.NET Java EJB Session Beans (Stateless, Stateful) Entity Beans Message-Driven Beans Java Transaction Service (JTS) Java Message Service (JMS) Can be implemented through JMS Instance Pooling Activation/Passivate (on stateful beans) Java Server Page (JSP) 15 16

5 EJB Overview Types of Enterprise Java Beans Session Beans Stateful Stateless Entity Beans Bean-Managed Persistence (BMP) Container-Managed Persistence (CMP) Enterprise Java Beans Query Language Message-Driven Beans Session bean with Java Messaging features Session Beans For transient functions Represents conversational state Typically one per request Data is non-persistent Lifetime is limited by the client s once the client exits, the session bean and data are gone Simple and easy to program Light-weight Stateful Session Bean s Life Cycle The client invoke the create method The EJB container : Instantiates the bean Invokes the setsessioncontext Invokes ejbcreate The bean is ready,. While in the ready state EJB container may passivate the bean moving it from memory to secondary storage A client may invoke a business method EJB container may activate a bean,moving it back to the ready stage, and then calls the bean's ejbactivate method A client may invoke the remove method and the container calls the bean's ejbremove method 19 20

6 Stateful Session Bean s Life Cycle Stateless Session Bean s Life Cycle The client invoke the create method The EJB container : Instantiates the bean Invokes the setsessioncontext Invokes ejbcreate The bean is ready. While in the ready state A client may invoke a business method A client may invoke the remove method and the container calls the bean's ejbremove method It s never passivate Stateless Session Bean s Life Cycle Types of Enterprise Java Beans Session Beans Stateful Stateless Entity Beans Bean-Managed Persistence (BMP) Container-Managed Persistence (CMP) Enterprise Java Beans Query Language Message-Driven Beans Session bean with Java Messaging features 23 24

7 Entity Bean Transactional in behavior Can be shared among clients Persistent: data exists permanently after client quits Corresponds to a row of a relational database The persistence (storing into the database) can be done: automatically by the container (CMP) or explicitly by the bean (BMP) In BMP, you write the code for database access calls This may be additional responsibility but it gives control to the bean developer. Entity Bean s Life Cycle The EJB container: Creates the instance Calls the setentitycontext The entity bean moves to a pool of available instances While in the pool: Instance is not associated with any particular object identity All instances in the pool are identical EJB container may assign an identity to an instance when moving it to the ready stage invoking the ejbactivate method A client may invoke the create method EJB container calls ejbcreate and ejbpostcreate EJB container may remove the instance invoking unsetentitycontext While in the ready state: A client may invoke entity bean's business methods A client may invoke the remove method EJB container calls the ejbremove method EJB container may invoke the ejbpassivate method Entity Bean s Life Cycle Types of Enterprise Java Beans Session Beans Stateful Stateless Entity Beans Bean-Managed Persistence (BMP) Container-Managed Persistence (CMP) Enterprise Java Beans Query Language Message-Driven Beans Session bean with Java Messaging features 27 28

8 Message-Driven Bean A message driven bean is an enterprise bean that allows J2EE applications to process messages asynchronously It acts as a JMS listener, which is similar to an event listener except that it receives messages instead of events. The messages can be sent by any J2EE component: an application client another enterprise bean a web component a non-j2ee system using JMS Retain no data or conversational state Message Driven Bean s Life Cycle EJB container creates a pool of message-driven bean instances For each instance, the EJB container instantiates the bean : It calls the setmessagedrivencontext It calls the instance's ejbcreate Like a stateless session bean,it s never passivated, It has only two states: Nonexistent Ready to receive messages While in the ready state : EJB container may call onmessage EJB container may call the ejbremove Message Driven Bean s Life Cycle 31

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