A2A

Application 2 Application Services

Application 2 Application Services
Application 2 Application Services is services which orchestrates services from several applications, typically asynchronous and workflow-backed. I.e. a Auction type request against a set of suppliers or an booking/order/delivery process.

Suggestion for a more presise definition
An A2A service is a service which is responsible for collaboration between several human or automated actors.

Characteristics

Services orchestrated to produce real busuness value

Workflow-oriented processes
Orchestrated functionality from several services
ACS/CS services as Business/Domain Objects
External applications for sub-processes & tasks
Long running processes
Should not have any long-running transactions
Could (should) have cache (state full)

Patterns for Application 2 Application Services

Application 2 Application Services

Technology/Implementation strategy (Java)

Technology, implementation and products

Pick your favorite JEE/ESB/SOA platform vendor
- Sun, IBM, Oracle
Choose your favorite open source ESB/SOA platform
- OpenESB or another Open Source JBI container
- write a simple admin framework (upgrade tool support)

Technology/Implementation strategy (.NET)