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What’s Software Architecture?
• Architectural Design
– process for identifying the subsystems that make up a
system
– defines framework for sub-system control and
communication
– Behavior as specified in collaborations among those
elements
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Architectural Design Process?
• System structuring
– system decomposed into several subsystems
– subsystem communication is established
• Control modeling
– model of control relationships among system components is
established
• Modular decomposition
– identified subsystems decomposed into modules
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Why Software Architecture?
• Scale
• Process
• Cost
• Schedule
• Skills and development teams
• Materials and technologies
• Stakeholders
• Risks
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Architecture types
Client/Server Architectures
client
send-request
server
receive-request
-Client-server architecture (client/server) is a network architecture in which each
computer or process on the network is either a client or a server
-Client computers provide an interface to allow a computer user to request
services of the server and to display the results the server returns
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Architecture types
• Components of Client/Server Architectures
System simple_cs = {
Component client = {Port send-request}
Component server = {Port receive-request}
Connector rpc = {Roles {caller, callee}}
Attachments : {client.send-request to rpc.caller;
server.receive-request to rpc.callee}
}
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Architecture types
• three-layer Architecture
• Layer indicates logical separation of components, such as having distinct namespaces and
classes for the Database Access Layer, Business Logic Layer and User Interface Layer.
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Architecture types
• pipe and filters Architecture
Pipe and Filters is architectural pattern in which an event triggers a series of processing steps
on a component, transforming it uniquely on each step. Each step is a called a filter
component and the entire sequence of called the pipeline
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Architecture types
• publish-subscribe Architecture
• In software architecture, publish–subscribe is a messaging pattern where senders
of messages, called publishers, do not program the messages to be sent directly to
specific receivers, called subscribers.
