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SOA - Architecture and DesignPresentation Transcript
Software Design – An introductionPatterns, Models and Reference ArchitectureSOA Computing + SOA ClientsSaaS - a Quick IntroductionSoftware Design – ConceptsBusiness Process ModelingSample Web 2.0 Application AnalysisSoftware Design Specification – How to…Discussions
•Second generation Application Development Platform for Web,Mobile and Business Systems.•Facilitating Communication, Information sharing, Interoperability,User-centered design and Collaboration on the World Wide Web.
Repeatable solution to a commonly occurring problem. Patterns can be repurposed across multiple domains and used to solve recurring problems there within. Example: Collaborative Tagging (Can be used for audio files, video files, text files, binaries, people…)
Definition: Abstract lexicon capturing a generalized set of concepts and noting their purposes and relationships to each other. Primary Audience: Entrepreneurs, Software or Enterprise Architects Why: Models guide all domains, whether explicit or implicit. They facilitate a common, shared understanding or conceptualization of a domain.
A technology component view of a generalized architecture. NB!: Abstract of all technologies (HTTP, TCP/IP java etc) and abstract of all applications or vendor products. Agnostic to patterns of usage. Primary Audience: Software or enterprise Architects, developers Why: There is a great value in being able to communicate ideas and functionality abstract of specific technologies protocols or products. These become artifacts that can be applied by architects in multiple domains.
Re-purposing core functionality as service to be consumed
Mashing up multiple formats Using services to deliver rich user experiences Rendering/Media engines let users control the way they use your applications. Are no longer standalone - use knowledge of other users applications.
Software Deployment Model Service On Demand Customized Solutions based on User Shared License
Abstraction ▪ Process or result of generalization by reducing the information content of a concept or an observable phenomenon, typically in order to retain only information which is relevant for a particular purpose.
Refinement It is the process of elaboration. A hierarchy is developed by decomposing a macroscopic statement of function in a stepwise fashion until programming language statements are reached. In each step, one or several instructions of a given program are decomposed into more detailed instructions. Abstraction and Refinement are complementary concepts.
▪ Modules ▪ Software architecture is divided into components called modules.
Architecture ▪ It refers to the overall structure of the software and the ways in which that structure provides conceptual integrity for a system. A software architecture is the development work product that gives the highest return on investment with respect to quality, schedule and cost. ▪ Use cases ▪ Logical Flow / State Diagrams ▪ Activity Diagrams / Process flow ▪ Implementation / Dependencies ▪ Deployment
Use Case Name: Upload new media Created By: Loganathan Last Updated By: Loganathan Date Created: April 10 2008 Date Last Updated: April 10 2008Actors Mobile User, PeermetaPreconditionsWorkflow Mobile User Peermeta Click Upload icon in the Home page Show Choose file and Upload buttons Select media to upload Press Upload button Store media under users accountPost conditions NAExtensions / Exception flow Exception capturing and displayAssumptions NA Use Case Name: Search media Created By: Loganathan Last Updated By: Loganathan Date Created: April 10 2008 Date Last Updated: April 10 2008Actors Mobile User, PeermetaPreconditions Logged in User at Home pageWorkflow Mobile User Peermeta Enter text in the search text box Click the search button Show the media(s) for the given type Click the clear button Clear the entered text in the text boxPost conditions NAExtensions / Exception flow Exception capturing and displayAssumptions NA
Data structures – Databases and Query Engines It is a representation of the logical relationship among individual elements of data.
Representing processes of an enterprise to analyze and Improved process efficiency and quality Business Process Re-engineering + Change management + Continues Improvement (Six Sigma)
Start event Acts as a trigger for the process; indicated by a single narrow border; and can only be Catch, so is shown with an open (outline) icon. End event Represents the result of a process; indicated by a single thick or bold border; and can only Throw, so is shown with a solid icon. Intermediate event Represents something that happens between the start and end events; is indicated by a tramline border; and can Throw or Catch (using solid or open icons as appropriate) - for example, a task could flow to an event that throws a message across to another pool and a subsequent event waits to catch the response before continuing.
Task A task represents a single unit of work that is not or cannot be broken down to a further level of business process detail without diagramming the steps in a procedure (not the purpose of BPMN) Sub-process Used to hide or reveal additional levels of business process detail - when collapsed a sub-process is indicated by a plus sign against the bottom line of the rectangle; when expanded the rounded rectangle expands to show all flow objects, connecting objects, and artefacts. Has its own self-contained start and end events, and sequence flows from the parent process must not cross the boundary. Transaction A form of sub-process in which all contained activities must be treated as a whole, i.e., they must all be completed to meet an objective, and if any one of them fails they must all be compensated (undone). Transactions are differentiated from expanded sub-processes by being surrounded by a tramline border. Gateway A Gateway is represented with a diamond shape and will determine forking and merging of paths depending on the conditions expressed.
Flow objects are connected to each other using Connecting objects, which consist of three types (Sequences, Messages, and Associations): Sequence Flow A Sequence Flow is represented with a solid line and arrowhead and shows in which order the activities will be performed. The sequence flow may be also have a symbol at its start, a small diamond indicates one of a number of conditional flows from an activity while a diagonal slash indicates the default flow from a decision or activity with conditional flows. Message Flow A Message Flow is represented with a dashed line, an open circle at the start, and an open arrowhead at the end. It tells us what messages flow across organisational boundaries (i.e., between pools). A message flow can never be used to connect activities or events within the same pool. Association An Association is represented with a dotted line. It is used to associate an Artifact or text to a Flow Object, and can indicate some directionality using an open arrowhead (toward the artifact to represent a result, from the artifact to represent an input, and both to indicate it is read and updated). No directionality would be used when the Artifact or text is associated with a sequence or message flow (as that flow already shows the direction).
Pool Represents major participants in a process, typically separating different organisations. A pool contains one or more lanes (like a real swimming pool). A pool can be open (i.e., showing internal detail) when it is depicted as a large rectangle showing one or more lanes, or collapsed (i.e., hiding internal detail) when it is depicted as an empty rectangle stretching the width or height of the diagram. Lane Used to organise and categorise activities within a pool according to function or role, and depicted as a rectangle stretching the width or height of the pool. A lane contains the Flow Objects, Connecting Objects and Artifacts.
Artifacts allow developers to bring some more information into the model/diagram. In this way the model/diagram becomes more readable. There are three pre-defined Artifacts and they are: Data Objects Data Objects show the reader which data is required or produced in an activity. Group A Group is represented with a rounded-corner rectangle and dashed lines. The Group is used to group different activities but does not affect the flow in the diagram. Annotation An Annotation is used to give the reader of the model/diagram an understandable impression