Bridging Pub/Sub to Temporal with Standalone Activities

This post details the practical application of Temporal Standalone Activities for bridging Pub/Sub messages to Temporal Workflows. It highlights how Standalone Activities keep event handlers thin and decoupled by offloading durability, retries, and timeouts to Temporal. The post emphasizes the importance of using deterministic Workflow IDs derived from the event source (e.g., file path) and configuring `WorkflowIDConflictPolicy.USE_EXISTING` to ensure correct behavior during retries and prevent duplicate workflow executions. It also explains how to set unique Activity IDs for each message and use `ActivityIDConflictPolicy.USE_EXISTING` to manage redelivered messages. The author shares personal anecdotes illustrating the complexity of manual state management and retry logic before Standalone Activities, underscoring their value.