• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Liutauras Vilda
  • Tim Cooke
  • Jeanne Boyarsky
  • Bear Bibeault
Sheriffs:
  • Knute Snortum
  • paul wheaton
  • Devaka Cooray
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Ron McLeod
  • Piet Souris
  • Ganesh Patekar
Bartenders:
  • Tim Holloway
  • Carey Brown
  • salvin francis

Tiers in J2EE framework

 
Ranch Hand
Posts: 157
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
please let me know the concept of TIERS in J2EE
Is it a logical boundary or a physical boundary between layers.
When i have webserver,application server and database server on same machine
Is it a single tier or three tier?
thanks
Vikas
 
Ranch Hand
Posts: 18944
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Hi Vikasids
The tier model is the logical dividing of the three logical functions: presentation, business logic and data storage. Even when you are having it all on a single server, it will be possible to make a nice three tier model.
BR Jan
 
Ranch Hand
Posts: 2676
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
A tier is generally a logical boundary, but a physical boundary could exist as well. For example, my servlets and jsps may represent a web tier of my application. My EJBs representing my business logic are the 2nd tier, and my database is my third tier.
It doesn't really matter where my servers are running, you still have the logical separation of your code. If they are running on separate servers, then you have a physical boundary that maps to the logical boundary.
 
Ranch Hand
Posts: 8934
Firefox Browser Spring Java
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Q- Do Stored procedure and table data exist in different tier.?
I remember reading a article which tells me SP are in a different tier than the database data. SP is in data access tier and data is in data tier.
 
author
Posts: 11962
5
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Physically you can't separate stored procedures and the data as both are located in the database server (stored procedures are "installed" into the database similarly as records are inserted). Logically, however, the stored procedures belong to the business logic layer (or, if you prefer separating even more, to the data access layer).
 
(instanceof Sidekick)
Posts: 8791
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
There are many ways to look at tiers or layering. I collected a few on my Logical View andArchitectural Layering pages.
 
vikasids sharma
Ranch Hand
Posts: 157
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
From the above clarifications can i make out one thing for sure that
Tier architecture expands from n tier to n+1 in both horizontal and vertical directions.
Lets say
We have 3 separate layers(tiers) for respective presentation , business and data base related data
case 1
if we break business layer in further two layers , we will call it n tier(3+1)solution.(vertical expansion)
case 2
if we add another layer horizontally to presentation, business and database , again we will call it n tier(3+1) solution.
 
permaculture is a more symbiotic relationship with nature so I can be even lazier. Read tiny ad:
professionally read, modify and write PDF files from Java
https://products.aspose.com/pdf/java
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!