CSC/ECE 517 Summer 2008/wiki3 7 SHOP PAT

Problem Definition

Shopper pattern. The idea of a "shopping cart" is ubiquitous in e-commerce. This idea lends itself to abstraction in the form of a Shopper pattern. Find examples and descriptions that are suitable for teaching this pattern, if possible, including some non-obvious applications. Write up your findings in the form of a narrative.

Introduction

The main purpose of Shopper Pattern is to provide as a means to assist people or consumers to obtain a collection of items from a set of shops or the providers. And the goal is achieved without introducing coupling between the consumer and the provider.

Participants

• Consumer :provide a list of items and user is allowed to choose item among them.Then the price is scanned and placed in the shopping bag.

• Shopper: Browse through the item from the shopping list and search for the muliple provider for that particular item.Shopper may search the item on diffent basis ex: Brand name, lowest price.highest price etc.

• Provider:It keeps multiple items and make it available to shopper. At the same time assist the shopper in locating the other providers.

• ItemRequest: Requested item by th eshopper is identified.

• Item:The things that are a provider owns,described by an item request,a consumer request, and a shopper obtains.

Consequences

• Shopper pattern helps in decoupling the requesting object from the object that provide the requested items.
• The responsibilities can be moved for provider objects.the requesting application will not nee dto be modified.
• The provider objects can be rearranged without modyfying the requesting application.
• Optional items can be optimized in such a way so that the processing time will be required only if th eitem is present in the list.

Steps to remember in designing:

• Standard icons and conventions:
• Avoid irrelevant links:
• Reveal structure:
• Leave breadcrumbs:
• Don't bury information
• Don't be mysterious:
• Provide help: