Developing services

Learn about developing services.

About services
A service is a process on its own: anything that is executable and can access the IBM® Spectrum Symphony API can implement a service. The service does not initiate any actions on its own. IBM Spectrum Symphony triggers all service actions.
Service lifecycle
IBM Spectrum Symphony triggers state changes for the ServiceContainer as illustrated in the following diagram. The calls indicated on the diagram are calls made in the service, with the exception of Register() which is an internal call made by the system.
MapReduce samples
The MapReduce framework provides samples that you can compile and run to test MapReduce applications.
Access to application attributes in a service
The service API gives developers access to information exposed to the service instance (SI). It is applicable to all supported operating systems.
Error codes and embedded service exceptions
When an exception is thrown from within the service of an application during its invocation, during the processing of common data when the invocation of OnSessionEnter causes the session to be aborted, or during the processing of common data update when the invocation of OnSessionUpdate causes the session to be aborted, that exception is propagated to the client.
Service error handling and host blocking
Learn about service error handling and host blocking.
Service interrupt handler
This feature enables developers to respond appropriately to any events that interrupt the running of a service instance during execution of a task. It is applicable to all supported operating systems.
Concurrently running tasks in a single service to share data
Running multiple tasks concurrently in one service instance permits you to easily share data among tasks in the same session or application, and save memory. An application that is configured to run multiple tasks concurrently on a service instance is called a multiple task service (MTS) application. This feature is supported on all operating systems supported by IBM Spectrum Symphony Advanced Edition. It is not supported on for MapReduce jobs.

Parent topic: Developing applications for IBM Spectrum Symphony