2014 Pre-MSc-IS-1 Java Enterprise Edition and Information Systems Layering

Programme: Master of Science in Business Information Systems FHNW
Course: Pre-Master Information Systems
Topic: Java Enterprise Edition and Information Systems Layering

Transcript

1. Andreas Martin - Page 1 Master of Science in Business Information Systems FHNW Pre-Master Information Systems 1. Java Enterprise Edition and Information Systems Layering Andreas Martin 1. Java Enterprise Edition and Information Systems Layering http://www.flickr.com/photos/jcolivera/2950430514
2. Andreas Martin - Page 2 What is Java EE?  «Java EE 7 is an umbrella specification» http://www.flickr.com/photos/tworm/3362762909/ Source: The Java EE 7 Tutorial, Oracle Corporation, 2013: http://docs.oracle.com/javaee/7/tutorial/doc/javaeetutorial7.pdf 1. Java Enterprise Edition and Information Systems Layering
3. Andreas Martin - Page 3 Prejudice against Java EE 1. Java Enterprise Edition and Information Systems Layering
4. Andreas Martin - Page 4 1. Complexity Java EE is http://www.flickr.com/photos/sea-turtle/198445204/
5. Andreas Martin - Page 5 2. Performance http://www.flickr.com/photos/63885769@N00/4697146984/
6. Andreas Martin - Page 6 3. Stability http://www.flickr.com/photos/crilix/3781456153/
7. Andreas Martin - Page 7 …to much coffee… Enterprise JavaBeans http://www.flickr.com/photos/jcolivera/2950430514
8. Andreas Martin - Page 8 Java EE 7 We love it… http://www.flickr.com/photos/jcolivera/2949579735
9. Andreas Martin - Page 9 Fundamental Principle: Layering http://www.flickr.com/photos/rvoegtli/5688343678/
10. What is the difference between “Layer” and “Tier”?  «Layers are a way of organizing your code.»  «Tiers are about where your code runs.» http://www.flickr.com/photos/rvoegtli/5688343678/
11. The Latte Macchiato «Layering» Principle http://www.flickr.com/photos/tf28/4367660424 Presentation Layer Goal: Display of information, processing / forwarding of user interactions. Technologies: JavaServer Faces (JSF), JavaServer Pages (JSP), Servlets, etc. Business (Logic) Layer Goal: Reproduction of actions or «verbs» of the application (buy a book, print an order, deliver a book, etc.). Technologies: Enterprise Java Beans (EJBs) Persistence Layer Goal: Reproduction of database attributes, information or «nouns» in object / class attributes (Object-Relational Mapping, ORM). Technologies: Java Persistence API (JPA)
12. Andreas Martin - Page 12 Java EE Layering 1. Java Enterprise Edition and Information Systems Layering
13. Andreas Martin - Page 13 Java EE and (Technical) Tiers 1. Java Enterprise Edition and Information Systems Layering Source: The Java EE 7 Tutorial, Oracle Corporation, 2013: http://docs.oracle.com/javaee/7/tutorial/doc/javaeetutorial7.pdf
14. Andreas Martin - Page 14 Java EE 7 – Typical Layering 1. Java Enterprise Edition and Information Systems Layering
15. Andreas Martin - Page 15 Business Layer Java EE 7 – Typical Layering including Process Layer 1. Java Enterprise Edition and Information Systems Layering Databases Persistence Layer @EntityManager (JPA) (JPA) @Entity (JPA) Session Bean (EJB) @PersistenceContext Service Layer Presentation Layer Users Service Consumer Process Layer User Interface Component Service Interface Business Process @EJB / @Inject
16. Andreas Martin - Page 16 Business Layer Java EE 7 – Typical Layering 1. Java Enterprise Edition and Information Systems Layering Persistence Layer @EntityManager (JPA) (JPA) @Entity (JPA) Session Bean (EJB) @PersistenceContext Presentation Layer Facelets (JSF) @ManagedBean (JSF) Facelets (JSF) Users Databases @EJB / @Inject
17. Andreas Martin - Page 17 Package Structure Recommendation … 1. Java Enterprise Edition and Information Systems Layering
18. Andreas Martin - Page 18 Package Structure  Recommendation - (ch.xx.project…): .domain (Persistence Layer): Entity classes .dao (Business Layer in Java EE and Persistence / Data Access Layer in Spring): DAO- classes (Java EE 7: Abstract Facade / Spring: Abstract Facade and Specific DAO) .business (Business Layer): Enterprise Java Beans .service (Service Layer): Service Facade, SOAP und REST Web- Services .controller (Presentation Layer): Controller classes .view (Presentation Layer): Views .dto (Layer independent) : Transfer objects .util (Layer independent) : Utility classes 6. Java EE 6 Architecture