Architectural Pattern

Architectural Pattern 

• Architectural patterns for software define a specific approach for handling some characteristic of the system.
• Bosch and Booch define a number of architectural pattern domains.
• Access control :
• There are many situations in which access to data, features, and functionality delivered by an application is limited to specifically defined end users.
• Concurrency :
• There are a number of different ways in which an application can handle concurrency, and each can be presented by a different architectural pattern.
• Distribution:  
• The distribution problem addresses the manner in which systems or components within systems communicate with one another in a distributed environment.Twosubproblems are considered:
• (1) the way in which entities connect to one another,
•  For example The most common architectural pattern established to address the distribution problem is the Broker pattern. Abroker acts as a “middleman” between the client component and a server component. 
•  Persistence : 
•  Persistent data are stored in a database or file and may be read or modified by other processes at a later time. 
• two architectural patterns areused to achieve persistence 
• —A DatabaseManagementSystem 
• --- Application LevelPersistence pattern that builds persistence features into the application architecture