JMS with Client Acknowledge and durable subscriptions provides guaranteed, once-and-only-once delivery semantics. The message remains in the persistent queue until the BusinessWorks process successfully processes it and acknowledges it, surviving server restarts. HTTP is inherently stateless and less suited for guaranteed delivery without complex, custom-built logic.

In TIBCO BusinessWorks, connections to external HTTP/SOAP/REST services are managed through Shared Resources (like HTTP Connection). If this resource is not configured with the correct parameters (timeouts, security) or is not in the ‘Started’ state, the process will fail with connection errors, even if the target URL is valid.

The Parallel activity (or a Group with its execution mode set to ‘Parallel’) is specifically designed for this scenario. It allows multiple execution branches to run concurrently, significantly reducing overall latency compared to sequential execution. The process can then synchronize and aggregate the results before sending the final response.

The ‘Mark as processed’ feature (often involving moving or renaming the file to a ‘Processed Directory’) is the standard mechanism for achieving once-only processing in a File Poller. This action is atomic from the poller’s perspective. If the process crashes after reading but before finishing, the file is already marked as processed and will not be picked up again after a restart. ‘Delete after reading’ is risky and doesn’t aid in recovery scenarios.

A key characteristic of a transaction scope in TIBCO BusinessWorks is atomicity. If any activity within the scope (including Generate Error) throws a fault that is not caught and handled *inside* the scope, the entire transaction is rolled back. This ensures data consistency but means the developer must design fault handling carefully, potentially using Try-Catch within the transaction to handle specific errors without triggering a full rollback if not desired.

Event Sources (Signal In, Wait) and Event Generators (Signal Out, Notify) enable event-driven architecture. They allow a running process instance to pause and wait for an event (e.g., a Signal from another process, a timer expiry) before proceeding. This is fundamental for designing long-running, stateful processes that react to business events, rather than just short request/reply flows.

A Transaction scope is the correct construct to define a unit of work. To include both the SOAP call (which may be transactional via WS-AtomicTransaction) and the JDBC update in a single distributed transaction, XA (two-phase commit) support must be configured for the involved resources (JDBC Connection and SOAP’s transaction support). This ensures atomic commit or rollback across both systems.

The SOAP Request Reply process starter is the primary method for exposing a synchronous service endpoint. It generates a WSDL based on the input and output schemas you define, providing a standard, contract-first web service interface. This allows any SOAP-aware client to invoke the BusinessWorks process seamlessly.

Shared Variables are accessible by all process instances across all engines in a domain. This makes them susceptible to race conditions when multiple threads (processing different requests) read and write to them concurrently. This can cause unpredictable data corruption and bugs that are hard to reproduce. Preferences should be given to process instance variables, passing data via inputs/outputs, or using a proper shared state mechanism like a database or EMS.

JMS with Client Acknowledge and durable subscriptions provides guaranteed, once-and-only-once delivery semantics. The message remains in the persistent queue until the BusinessWorks process successfully processes it and acknowledges it, surviving server restarts. HTTP is inherently stateless and less suited for guaranteed delivery without complex, custom-built logic.0