Service-oriented Programming - Cross-cutting Concerns - Inter-service Communication

Inter-service Communication

In addition to the ability to call any service, Service Request Events and Shared Memory are two of the SOP built-in mechanisms provided for inter-service communication. The consumption of a service is treated as an Event in SOP. SOP provides a correlation-based event mechanism that results in the pre-emption of a running composite that has declared, through a "wait" construct, the need to wait for one or more other service consumption events to happen with specified input data values. The execution of the composite service continues when services are consumed with specific correlation key inputs associated with the wait construct. SOP also provides a shared memory space with access control where services can access and update a well-defined data structure that is similar to the input/output structure of services. The shared memory mechanism within SOP can be programmatically accessed through service interfaces.