eBay Case Study

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• eBay Case Study
• Jeremy Kraybill Jeremy Thomerson

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CARad Who Are We?
Started as an auction site in competition with
eBay, before eBay had really developed its Motors
division.
Grew to be the 1 tool for listing vehicles
on eBay Motors
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CARad Overview
Acquired by eBay in March 2003

• Listing and vehicle management tools for vehicle
  sellers
• CARad.com focused on dealers
• CARad Express focused on individuals
• Generally 4,000-5,000 live listings at any given
  time on eBay Motors
• 70 of users are dealers
• Application hosted out of eBay Denver hosting
  facility
• Originally written in Macromedia ColdFusion
• Migration of all application functionality over
  to Java with Spring / Tapestry / Hibernate /
  Freemarker infrastructure

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Functional Architecture
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CARad Java Architecture
Engine
Offline applications
Pages
SOAP interface
Web Components
Tapestry
Axis
Services Layer
Services Layer
Domain Model
Domain Model
DAO Layer
DAO Layer
Hibernate Mappings
Hibernate Mappings
Spring ORM
Spring ORM
Spring
Hibernate
Hibernate
Spring
Servlet container
DB
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Build / Test Environments
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Modular overrides in Spring
Hierarchical Spring contexts Need for overridden
beans within the context at some levels. Define
base configurations at lower modules that can be
overridden at higher level. Test configurations
can also override module-config on each level to
provide mocked out services, etc
Our top level applications have the need to
override beans that are used by beans in lower
modules. For example, our US site may need to
add a page into a list of pages defined within
our standard web flow, whereas another countrys
site may not need to override that standard page
flow.
carad.com.api
carad.com.fsbo
carad.com.dealer
internal.web
internal.apps
internal.domain testing config
internal.domain services DAOs
internal.platform testing config
internal.platform abstract session
factories declarative transaction policies logging
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Switching applications at runtime
As we build out many different applications, we
develop the need to be able to quickly change
between them for development and testing of
shared code and configuration. We use a Spring
service to be able to switch applications at
runtime (development / regression) without
restarting our web server.
ContextLocator setContextName(String) getContext()
ContextSingletonBeanFactoryLocator
Other Countries
Other Verticals
Motors (US)
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Database build
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Distributed regression
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