Client-Server Architecture consists of two types of components: clients and servers. 

4 layers of a general information system are as follows:

--> Presentation layer (also known as UI layer)

The presentation layer is responsible for the following:

-->Application layer (also known as service layer)

The application layer provides many services, including:

 --> Business logic layer (also known as domain layer)
Business logic is the programming that manages communication between an end user interface and a database. 
Business rule describes :

-->Data access layer (also known as persistence layer)
Data access layer.in computer software, is a layer of a computer program which provides simplified access to data stored in persistent storage of some kind, such as an entity-relational database. 

b) Interface

c) Dependencies

d) Port

Example :
 

 

 

 

ONE of the most special features of client server architectural pattern is mix and match platforms. Client and server can be mixed and matched for different platforms. One of the example is the hardware and operating system can be well intermixed. The figure below shows how client and server architectural pattern works.

The most commonly found 4 layers of a general information system are as follows.

One special feature that makes us think this pattern is layered is when there is a grouping of related functionality into distinct layers that are stacked on top of each other. And it is an  inverted pyramid of reuse where each layer aggregates the responsibilities and abstractions of the layer directly beneath it .

A computer network diagram of clients communicating with a server via the Internet.

Allows replacement of entire layers so long as the interface is maintained. Redundant facilities (e.g., authentication) can be provided in each layer to increase the dependability of the system. 
Disadvantage: 
 Providing a clean separation between layers is often difficult and a high-level layer may have to interact directly with lower-level layers rather than through the layer immediately below it. Performance can be a problem because of multiple levels of interpretation of a service request as it is processed at each layer. 

One special feature that makes us think this pattern is Pipe and Filter because it has message queue as pipe and it also has filters.

Sequence Diagram

One special feature that makes us think this pattern is repository because it has the Repository which is responsible to provide and implement these query methods. 

Main objective: To create seperation of concern (To seperate user interface with software logic.)

Image below shows the process flows in MVC.

Component diagrams can be used to −

Component diagrams are different in terms of nature and behavior. Component diagrams are used to model the physical aspects of a system. 

Component diagrams are used to visualize the organization and relationships among components in a system. These diagrams are also used to make executable systems. 

 

The purpose of the component diagram can be summarized as −

Figure 1: MVC class structure 

By separating the software applications to three components is a good idea where it helps to: 

Disadvantages of MVC
1. The complexity is high to develop the applications using this pattern.
2. Not right suitable for small applications which has adverse effect in the application’s performance and design.
3. In terms of servlet and JSP, both often contains business logic and presentation tier.
4. The isolated development process by UI authors, business logic authors and controller authors may lead to delay in their respective modules development. 

Represents hardware or software objects, which are of a higher level than components.

Shows input or materials that a component either receives or provides. 

Specifies a separate interaction point between the component and the environment. 

Groups together multiple elements of the system and is represented by file folders in Lucidchart

Allows developers to affix a meta-analysis to the component diagram.

  Shows that one part of your system depends on another.