Component to System State Store

Synchronous Event Posting

In a RECQ architecture, components interact with the System State Store (SSS) in a specific manner for managing state changes. This interaction follows a request/response pattern with a synchronous protocol managed by the SSS itself.

Communication Protocol:

• Synchronous Event Posting: Unlike the asynchronous communication used for component-to-component interaction, posting a state change event to the SSS is a synchronous operation.

  • Components send a request message directly to the SSS containing the event data representing the desired state change.

  • The SSS validates the event and attempts to persist it in its storage mechanism.

  • Upon successful persistence, the SSS sends a response message back to the component, confirming the success or failure of the operation.

  • The synchronous nature ensures the component receives confirmation before proceeding with further actions that might depend on the state change.

Benefits of Synchronous Event Posting:

• Strong Consistency: Synchronous event posting guarantees that the event is successfully persisted in the SSS before the component receives a confirmation. This ensures strong consistency between the component's view of the state and the actual state stored in the SSS.

• Simplified Error Handling: The component receives immediate feedback on the success or failure of the event posting, allowing for easier error handling and potential retries if necessary.

Considerations:

• Reduced Scalability: Synchronous communication can introduce bottlenecks if a large number of components frequently update the state. This might require careful configuration and optimization of the SSS to handle high volumes of event posting requests.

• Potential Latency: If components rely heavily on immediate confirmation, synchronous event posting can introduce slight latency compared to asynchronous approaches.

Conclusion:

The RECQ architecture utilizes a synchronous request/response pattern for component-to-SSS communication when posting state change events. This approach guarantees strong consistency and simplifies error handling, but it's important to consider potential scalability and latency impacts for high-volume systems. The specific communication strategy might be adjusted based on the application's specific needs and performance requirements.