Inversion of Execution

This post introduces and explains the core architectural concept of 'Inversion of Execution' in Temporal. It details how the Temporal Server orchestrates workflow and activity tasks, which are then executed by client-side Workers. This model is contrasted with traditional execution models where a server directly runs application code. The post elaborates on the benefits of this approach, including enhanced reliability through deterministic replay of workflow tasks, improved security via zero-trust and encrypted payloads, and simplified scalability by separating server and worker concerns. A bank transfer example illustrates the workflow and activity task execution flow.