Component-Based Software Engineering. ECE493-Topic 5 Winter Lecture 26 Java Enterprise (Part D)
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1 Component-Based Software Engineering ECE493-Topic 5 Winter 2007 Lecture 26 Java Enterprise (Part D) Ladan Tahvildari Assistant Professor Dept. of Elect. & Comp. Eng. University of Waterloo J2EE Application Server Java 2 Enterprise Edition standardizes interfaces for Application Server components 2
2 EJB Overview 3 EJB Enterprise Java Beans Enterprise Java Beans are components that are deployed into containers The container provides services Loading / Initialization Transactions Persistence Communication with EJB clients Enterprise Naming Context (JNDI name space) 4
3 Java versus.net for the Enterprise.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) 5 JTA / JTS Transactions The Java Transaction API (JTA) and the Java Transaction Service (JTS) allow J2EE application servers to take the burden of transaction management from the component developer Developers can define the transactional properties of Enterprise JavaBeans technology based components during design or deployment using declarative statements in the deployment descriptor The application server takes over the transaction management responsibilities 6
4 Transactions In EJB only addresses persistent data Application code required to rollback changes in application variables Either Bean or Container Managed Transaction Bean Managed Explicit use of the Java Transaction API by the Bean Container Managed Completely declarative in deployment descriptor Container invokes business method in specified scope Entity Beans must use Container Managed transactions Session and Message Beans may use Bean Managed Clients can also establish transactional scope 7 Transaction Attributes NotSupported Method never called within a transaction Container suspends client context if it exists Required Runs in client s context if it exists otherwise Container create a new context Used for a method that requires transaction, but can participate in a broader unit of work Example: depositing money in an account Can be atomic by itself or part of a greater transaction involving other operations 8
5 Transaction Attributes Supports Uses client s context if it exists otherwise runs without a context Needs to be used with caution RequiresNew Container always runs the method in a new transaction Useful for work that commits regardless of results of outer unit of work Mandatory Client must invoke the method from within a transaction Container uses this context Never Client must not invoke the method from within a transaction Container does not provide transaction context 9 Java versus.net for the Enterprise.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) 10
6 JMS Java Message Service Enterprise messaging provides a reliable, flexible service for the asynchronous exchange of critical business data and events throughout an enterprise The JMS API adds to this a common API and provider framework that enables the development of portable, message based applications in the Java programming language Why should we use JMS? Loosely-Coupled systems Connectionless Removes dependence on client and server platform / programming language / version Publish / Subscribe metaphor Send / receive information with many, unknown clients Integration with other messaging systems IBM MQ-Series Microsoft Message Queue 11 JMS Java Message Service JMS Queue JMS Topic 12
7 Java versus.net for the Enterprise.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) 13 J2EE Application Server Java 2 Enterprise Edition standardizes interfaces for Application Server components 14
8 Java Servlets Servlets are the Java platform technology of choice for extending and enhancing web servers Servlets provide a component-based, platform-independent method for building web-based applications Servlets have access to the entire family of Java APIs, including the JDBC API to access enterprise databases Servlets can also access a library of HTTP-specific calls and receive all the benefits of Java language, including Portability Performance reusability 15 Anatomy of a Servlet init() the init() function is called when the servlet is initialized by the server. This often happens on the first doget() or dopost() call of the servlet destroy() this function is called when the servlet is being destroyed by the server, typically when the server process is being stopped 16
9 Anatomy of a Servlet doget() the doget() function is called when the servlet is called via an HTTP GET dopost() the dopost() function is called when the servlet is called via an HTTP POST POSTs are a good way to get input from HTML forms 17 JSP Java Server Pages Java Server Pages technology uses XML-like tags and scripts written in the Java programming language to encapsulate the logic that generates the content for the page Any and all formatting (HTML or XML) tags are passed directly back to the response page By separating the page logic from its design and display and supporting a reusable component-based design, JSP technology makes it faster and easier than ever to build webbased applications 18
10 EJB Example The OnLine Bank Services: what the client can do in the system such as see the foreign currency, listed shares or make operations on his hown account. Accounts: a database containing the accounts of all the clients of the bank with information about credit,debit,access etc. Security: is a subsystem that receives all the alarm caused from wrong access and performs action about the situation (calls police and stops operation of that client keeping information about him/her) Security Virtual Bank Services Client Accounts 19 EJB Example: The OnLine Bank Easy to create an EJB structure: Client will have a web page at client side to insert values and connect the system This will be done using JSP (Java Servlet Pages ) Services will be a Stateful Session Bean it will be different for each client connecting the system mantaining data about the client connected. Accounts will be formed by an Entity Bean for each account in the system with a code-account as primary key. Security will be a Message Driven Bean and will be called only from container if some operation are abnormal for result or the autentification for the same client fails too much times. 20
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