Seminarium on Component-based Software Engineering

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Presentation transcript:

Seminarium on Component-based Software Engineering JavaBeans David Snuijf

Java Released in alpha-form in 1995 by Sun Originality: concepts of applets Java became common used by 1996 20/04/2019 Seminarium CBSE

Java – components Java component models: Applet JavaBeans Enterprise JavaBeans Servlets Application client components J2SE J2EE J2SE: Java 2 platform, Standard Edition J2EE: Java 2 platform, Enterprise Edition 20/04/2019 Seminarium CBSE

Let’s get into avaBeans J 20/04/2019 Seminarium CBSE

JavaBeans – solution to.. Enables software developers to design and create reusable pieces of software that easily integrate with each other with applications with development tools 20/04/2019 Seminarium CBSE

JavaBeans – Main aspects Events Properties Introspection Customization Persistence 20/04/2019 Seminarium CBSE

JavaBeans Approach to composition: Beans define: Connection-oriented programming / wiring Beans define: Event sources Event listeners By connecting one bean instance’s listener to another bean instance’s event source, events flow container structures InfoBus 20/04/2019 Seminarium CBSE

Let’s get into nterprise JavaBeans E 20/04/2019 Seminarium CBSE

Enterprise JavaBeans (EJB) Provide a framework for components that may be "plugged in" to a server Enterprise JavaBeans is totally different of JavaBeans, except that it uses some similar concepts 20/04/2019 Seminarium CBSE

Enterprise JavaBeans – Goals Easy for developers to create applications Standard way for client/server applications Compatible with and uses other Java APIs EJB can interoperate with non-Java apps EJB is compatible with CORBA 20/04/2019 Seminarium CBSE

Enterprise JavaBean component Client EJB Home stub EJB Object stub Home Remote or local EJB Server EJB Container EJB Home EJB Object EJB Bean 20/04/2019 Seminarium CBSE

Kind of Enterprise JavaBeans Four kind of EJB beans Stateless session Stateful session Entity Message-driven 20/04/2019 Seminarium CBSE

Questions? ? 20/04/2019 Seminarium CBSE

20/04/2019 Seminarium CBSE