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3 Tier Architecture

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What is it?

What is it?
Evolution to the 3-Tier Architecture
Advantages and Disadvantages
Example of 3 Tier aplication in .NET platform with C# language

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    3 Tier Architecture 3 Tier Architecture Presentation Transcript

    • 3-Tier Architecture
    • Main Points
      • What is 3-Tier Architecture?
      • Evolution to the 3-Tier Architecture Development
      • What does 3-Tier Architecture offer you?
        • Advantages and disadvantages using 3-Tier Architecture
      • Example of how you can implement 3-Tier Architecture in .Net platform using C#.
    • What is 3-Tier Architecture?
      • A three-way interaction in a client/server environment.
        • The user interface is stored in the client.
        • The bulk of the business aplication logic is stored in one or more servers.
        • The data are stored in a database server.
    • What is 3-Tier Architecture
    • Evolution to the 3-Tier Architecture
      • Single Tier
      • Dual Tier Environments
      • 3-Tier Architecture
      • N-Tier Architecture
      Tiers we are going to study…
    • Single Tier (I)
      • Time of huge “Mainframe”
      • All processing in a single computer.
      • All resources attached to the same computer
      • Access via dumb terminals
    • Single Tier (II)
      • Advantages
        • Simple
        • Efficient
        • Uncomplicated
      • Disadvantages
        • The cost of the central machine is very expensive
    • Dual Tier (I)
      • The Personal Computer
      • Necessity of providing personal software
      • The client/server model was born!!!!
    • Dual Tier (III)
      • Logical system components – most wich are on the client.
    • Dual Tier (II)
      • Problems with this model:
        • The connections are very expensive.
        • One can only connects a limited number of users to a server before SQL server spends more time managing connections than processing request.
        • Cost-ineffective. Many users only use their connection 2-3% of the time.
    • 3-Tier Architecture (I)
      • With the advent of Internet many people jumped to the conclusion that the days of the mainframe were back.
      • Client/Server obviously failed, personal computers had failed and Windows was on its way out.
      • A host of “thin client” application where developed.
      • Thus 3-tier applications were born.
    • 3-Tier Architecture (II)
      • This application runs the traditional client/server model but from a web server.
    • 3-Tier Architecture (III)
      • The client only displays the GUI and data, but has no part in producing results.
    • 3-Tier Architecture (IV)
      • Benefits:
        • SCALABILITY:
          • The application servers can be deployed on many machines.
          • The database no longer requires a connection from every client (only from a smaller number of application servers).
          • TP monitors or ORBs can be used to balance loads and dynamically manage the number of application server(s) available.
    • 3-Tier Architecture (V)
      • Benefits:
        • BETTER RE-USE:
          • If an estandard object is employed, the specific language of implementation of the middle tier can be made transparent.
        • IMPROVE DATA INTEGRITY:
          • The middle tier can ensure that only valid data is allowed to be updated in the database.
    • 3-Tier Architecture (VI)
      • Benefits:
        • IMPROVED SECURITY:
          • Since the client doesn’t have direct access to the database.
          • Business Logic is generally more secure since it is placed on a more secure central server.
        • REDUCED DISTRIBUTION:
          • Changes to business logic only need to be updated on the application servers and do not have to be distribuited to all the clients.
    • 3-Tier Architecture (VII)
      • Benefits:
        • IMPROVED AVAILABILITY:
          • Mission-critical applications can make use of redundant application servers and redundant database servers, so it can recover from network or server failures.
        • HIDDEN DATABASE STRUCTURE
          • Since the actual structure of the database is hidden from the caller.
    • 3-Tier Architecture (VIII)
      • Drawbacks:
        • INCREASED COMPLEXITY/EFFORT:
          • In general is more difficult to build a 3-tier application compared a 2-tier application because:
            • The points of communication are doubled.
            • Many handy productivity enhacements provided by the client tools will be foregone or their benefit will be reduced.
        • FEWER TOOLS:
          • The existence of more tools available for a 2-tier model (e.g. most reporting tools).
    • 3-Tier Architecture (IX)
      • The complexity concerns in the 3-tier model can not be easily dismissed, but there are many situations in which it provides certain benefits.
        • Example:
          • The bulk of data maintenance is done by a small number of users.
          • A large number of users must be supported, but they only require a small subset of the total application logic
          • Other application need to exchange some information/data with this application
          • Some users need direct access to the data in order to use special tools (e.g. reporting tools).
    • 3-Tier Architecture (X)
      • Conclusions:
        • Complex application rules easy to implement in application server.
        • Business logic off-loaded from database server and client, which improve performance
        • Changes to business logic automatically enforce by server
        • Application server is portable to other database server platforms by virtue of the application SW.
        • Superior performance for medium to high volume environments
    • 3-Tier application in ASP.Net
      • Program organized into three major disjunctive tiers on layers:
        • Application layer or Business layer
        • Business layer
          • Property layer
        • Data layer
    • 3-Tier application example
      • Graphical User Interface
    • Presentation Layer
    • Property Layer (I)
    • Property Layer (II)
    • Business Layer
    • Data Layer
    • Presentation Layer Creating an object of the Property Layer
    • Presentation Layer Creating an object of the Business Layer
    • Presentation Layer Creating an object in wich will recieve the information
    • Presentation Layer Obtaining ID
    • Presentation Layer Calling of Business Layer Function
    • Business Layer Creating an object in wich will recieve the information
    • Business Layer Calling of Business Layer Function
    • Data Layer Result object declaration
    • Data Layer SQL Query definition
    • Data Layer Creating an object in wich we will recieve the information
    • Data Layer SQL Query Execution
    • Data Layer Returning the information of the database
    • Business Layer Returning the information of the Data Layer
    • Presentation Layer Returning Data from the Business Layer
    • Presentation Layer Displaying Results