September 2003
Intermediate to advanced
368 pages
10h 16m
English
Content preview from J2EE Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The Business Tier
There are several ways to slice up a J2EE application. It’s quite common to hear the phrases domain logic, business logic, business object, business tier, and other variants tossed around with wild abandon, resulting in more than a little confusion. What is the business tier? Is the application server part of the business tier, or does it enable the business tier? What about the database? The tables in the database? The servlet container?
All business tiers, as we use the term, have two functions in common. Business tiers:
Provide a structured model for application data.
Provide procedures for performing business-related activities.
Most also share the following characteristics. Business tiers:
Are shared by multiple clients.
Provide a framework for transactions, ensuring that the information in the domain model remains in a valid state.
Provide a persistence mechanism for application data.
Most enterprise applications ultimately serve multiple clients, whether different types of clients (servlet applications versus Swing GUIs) or multiple instances of the same type (10,000 Swing GUIs, or an array of web servers). Most applications will use some transaction functionality at least once, but transaction implementations can be done via JTA, EJB, JDBC, or raw objects, depending on the needs and desires of the designer. Persistence is commonly associated with the transaction logic, often via JDBC and a database. Chapter 10 is devoted to transactions and concurrency management, ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.