4 Layers in an SOA

4 Layers in an SOA

4 Layers in an SOA

There are 4 layers in an SOA:

  • Business Processes
  • Business Services
  • Integration Services
  • Enterprise Resources

4 Layers in an SOA

Enterprise Resources

  • existing applications
  • COTS systems (consumer, off the shelf)
  • Object Oriented systems
  • Legacy systems (eg CRM + ERP)
  • Data at this layer resides in existing applications¬†and databases
  • Operations have a specific, structured interface
  • Operations return structured responses
  • These applications provide transactions
    • single, logical units of work in the enterprise operational systems
  • Responsible for reading, writing and modifying data

Integration Services

  • Provide access and interfaces to existing applications
  • Expose existing applications as services
  • Involve translation from whats actually available in the application to whats desired as an enterprise service

Business Services

  • Provide high-level functionality
  • Provide an interface abstraction from the implementations in layers below
  • Provide virtual implementation of related business processes that can be re-used across multiple systems
  • Break the direct dependance between business processes and the underlying applications
  • provide business processes (eg customerProfiling) through the logical grouping of related operations (eg search customer by email)

Business Processes

  • Series of operations that are executed in an ordered sequence
  • Described in a business process model (BPM)
  • Executed by a business process management system (BPMS)
  • Included in orchestration in terms of
    • Execution
    • Sequencing
    • Selection
  • Provide long-running ¬†sets of activities
  • Operate on business documents
  • Composed of business activities

Sources: https://en.wikipedia.org/wiki/Service-oriented_architecture