List of Figures

Chapter 1: Patterns for Building Enterprise Solutions

Figure 1.1: Singleton pattern, abbreviated

Figure 1.2: Quote application layers

Figure 1.3: Layers pattern, abbreviated

Figure 1.4: Three-Layered Application, abbreviated

Figure 1.5: Three-Layered Services Application, abbreviated

Figure 1.6: Three-Layered Services Application applied to the quote application

Figure 1.7: Refinement of related patterns

Figure 1.8: A cluster of patterns

Chapter 2: Organizing Patterns

Figure 2.1: A set of patterns

Figure 2.2: Pattern relationships represented as lines

Figure 2.3: Pattern clusters

Figure 2.4: Levels of abstraction

Figure 2.5: Adding viewpoints

Figure 2.6: The PatternFrame

Figure 2.7: Root constraints of the PatternFrame

Chapter 3: Web Presentation Patterns

Figure 3.1: Web Presentation patterns cluster

Figure 3.2: MVC class structure

Figure 3.3: Behavior of the passive model

Figure 3.4: Using Observer to decouple the model from the view in the active model

Figure 3.5: Behavior of the active model

Figure 3.6: Example Web page

Figure 3.7: Page Controller structure

Figure 3.8: Using BaseController to eliminate code duplication

Figure 3.9: Separating the Web-dependent and Web-independent code

Figure 3.10: Simple page

Figure 3.11: Simple page displaying user input

Figure 3.12: Banner displaying dynamic content

Figure 3.13: Structure of the code-behind pages implementation

Figure 3.14: Page request sequence

Figure 3.15: Front Controller structure

Figure 3.16: Front Controller, typical scenario

Figure 3.17: Handler portion of the front controller

Figure 3.18: Command portion of the front controller

Figure 3.19: Structure of the code-behind classes of the view

Figure 3.20: Chain of composable filters

Figure 3.21: Intercepting Filter class diagram

Figure 3.22: Intercepting Filter sequence diagram

Figure 3.23: Decorator class diagram

Figure 3.24: Decorator sequence diagram

Figure 3.25: Event-driven intercepting filters

Figure 3.26: Intercepting filter that does not intervene in the message flow

Figure 3.27: Intercepting filter that redirects the message flow

Figure 3.28: Basic page cache configuration

Figure 3.29: Sequence for a cache miss (when the page is not in the cache)

Figure 3.30: Sequence for a cache hit (when the page is in the cache)

Figure 3.31: Basic Observer structure

Figure 3.32: Basic Observer interaction

Figure 3.33: Using a helper class to avoid inheriting from the Subject class

Figure 3.34: Separating DomainObject and Subject

Figure 3.35: State propagation using the pull model

Figure 3.36: Extraneous notifications

Figure 3.37: Modifying object state from within Update causes an infinite loop

Figure 3.38: Example UML static diagram

Figure 3.39: Observer class diagram

Figure 3.40: Modified Observer class diagram

Chapter 4: Deployment Patterns

Figure 4.1: Deployment cluster

Figure 4.2: Layers

Figure 4.3: UML representation of layers composed of subsystems

Figure 4.4: Sequence diagram of a top-down scenario

Figure 4.5: Sequence diagram of a bottom-up scenario

Figure 4.6: Three-Layered Services Application

Figure 4.7: Single-tiered distribution

Figure 4.8: Two-tiered distribution

Figure 4.9: Three-tiered distribution

Figure 4.10: Four-tiered distribution

Figure 4.11: Three-tiered distribution

Figure 4.12: Three-Layered Services Application

Figure 4.13: Simple Web application deployment

Figure 4.14: Complex Web application deployment

Figure 4.15: Extended enterprise application deployment

Figure 4.16: Smart client application deployment

Chapter 5: Distributed Systems Patterns

Figure 5.1: Patterns in the Distributed Systems cluster

Figure 5.2: Structure with no distribution

Figure 5.3: Structure with distribution

Figure 5.4: Behavior with distribution

Figure 5.5: Broker structure with server look-up

Figure 5.6: Broker behavior with server look-up

Figure 5.7: Structure of Broker serving as intermediary

Figure 5.8: Behavior of Broker serving as intermediary

Figure 5.9: HttpChannel implementation

Figure 5.10: TcpChannel/binary serialization implementation

Figure 5.11: Structure for the HttpChannel/SOAP example

Figure 5.12: Structure of the hybrid approach

Figure 5.13: Remote calls without a DTO

Figure 5.14: Reducing the number of calls by using a DTO

Figure 5.15: Using an Assembler to load data into the DTO

Figure 5.16: Behavior of a typical user request

Figure 5.17: Schema for sample application

Figure 5.18: Behavior of a typical user request

Figure 5.19: Schema for sample application

Figure 5.20: Visual Studio .NET DataSet file type

Figure 5.21: Singleton structure

Chapter 6: Services Patterns

Figure 6.1: Invocation of a service in an SOA

Figure 6.2: Communication channel and TCP/IP protocol stacks

Figure 6.3: Communication protocol stacks with addition of HTTP

Figure 6.4: Service elements

Figure 6.5: Service elements

Figure 6.6: Service Interface class diagram

Figure 6.7: Service Gateway consuming the service of a service interface

Figure 6.8: Application structure

Figure 6.9: Example Web application

Figure 6.10: Structural view of example Web application

Chapter 7: Performance and Reliability Patterns

Figure 7.1: Performance and Reliability patterns cluster

Figure 7.2: Basic clustering concepts

Figure 7.3: Asymmetric cluster

Figure 7.4: Symmetric cluster

Figure 7.5: Load balancing components

Figure 7.6: Load balancing and centralized state management

Figure 7.7: Load balancing and asynchronous session state management

Figure 7.8: Basic solution with a single application server

Figure 7.9: Solution with a scalable application tier

Figure 7.10: Non-failover solution with single point of failure

Figure 7.11: Solution with failover data tier