Layered architecture
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Layered Architecture. Group 1 - Wesley Flowers, Brian Kennedy, Corey Masters, Everett Thayer, Andre Vicente. Part 1: Introduction. Corey Masters. Layered Architecture. Most commonly used of all architectures Forms the basis of the modern paradigm of computing

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Layered Architecture

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Layered architecture

Layered Architecture

Group 1 - Wesley Flowers, Brian Kennedy, Corey Masters, Everett Thayer, Andre Vicente


Part 1 introduction

Part 1: Introduction

Corey Masters


Layered architecture1

Layered Architecture

  • Most commonly used of all architectures

  • Forms the basis of the modern paradigm of computing

  • Modules use services of the module(s) directly below it and provide services to the module(s) above it

  • Promotes loose coupling of cohesive modules

  • Often used as a "fallback" architecture when an obvious solution is not present

  • Other architectures can use this style, in a hybrid fashion


Layered architecture2

Layered Architecture

  • Aqua Lush Example

  • LCD TV Example (Bai and Chen)


Part 2 high level

Part 2: High-Level

Wesley Flowers


High level diagrams

High-Level Diagrams

Onion Diagram

Wedding Cake Diagram

Layer 5

Layer 4

Layer 3

Layer 2

Layer 1

Wedding Cake Design is typically used to show connection between layers in communication protocols and user interfaces.

Onion Diagram typically illustrates operating system layers.


Communication

Communication

  • Static Structure:

    The software is partitioned into layers that provide a cohesive set of services with a well-defined interface.

  • Dynamic Structure:

    Each layer is allowed to only use

    • the layer directly below it (Strict Layered style)

    • all the layers below it (Relaxed Layered style)


Part 3 example

Part 3: Example

Brian Kennedy


Wedding cake layered architecture for office delivery robots

(Wedding Cake) Layered Architecture for Office Delivery Robots

This example uses Strict Style.


Four main layers

Four Main Layers

  • Task Scheduling, Path Planning, Navigation and Obstacle Avoidance

    • Task Scheduling determines how long all the routes will take (determine by asking Path Planner the length of each path).

    • Path Planner creates paths the robot can take (Factoring in what navigation has said is possible).

    • Navigation decides what paths can be taken to reach destination (Using data from Obstacle Avoidance).

    • Obstacle Avoidance decides how to handle each obstacle the robot may run into.


Everett thayer

Part 4: Advantages

Everett Thayer


Advantages for the layered style

Advantages for the Layered Style

  • The layers can make great modules

  • Helps simplify the program by sub-dividing complex portions

  • Layers make use of the services provided by the layer below.

  • Layers provide services to the layer above

  • Satisfies the Principle of Cohesion

  • Layers are loosely coupled


Advantages for the layered style1

Advantages for the Layered Style

  • Supports information hiding

  • Layers help increase changeability, reusability, reliability, and maintainability

  • Changes can be made to certain layers and not the core functionality of the program

  • Systems can be easily ported to new platforms

  • Layers provide well-defined interfaces that can have reusable components


Layered architecture

Part 5: Disadvantages

Andre Vicente


The problem with overhead

The Problem with Overhead

  • Allocating information on a system with multiple sub-levels can become a problem in Layered Architecture design

  • Data that is passed through multiple layers can sometimes be changed due to the encryption and decryption of certain levels when either reading or writing information

  • Performance becomes an issue when traveling through multiple layers instead of accessing a component directly


Restrictions to layered independence

Restrictions to Layered Independence

  • Shared processes that are modified or added within higher layers must also be modified in the lower levels associated with the higher level

  • Modifying lower-level interfaces sometimes percolates to higher levels, commonly seen in a relaxed layered approach

  • Applications that require interface components can have longer standby times if the layers prevent them from accessing a database

  • Large applications can be controlled and encapsulated more effectively but this adds complexity to smaller systems

  • Satisfying an n amount of layers


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