Mastering Azure Serverless Computing

Orchestrator functions

The orchestrator function is the function responsible for the orchestration process: its code describes how the functions are executed and their order.

The orchestrator function is triggered by a special trigger called OrchestratorTrigger:

[FunctionName(FunctionNames.OrderWorkflowFunction)]    public static async Task Run([OrchestrationTrigger] DurableOrchestrationContext context,    ILogger log){    // Orchestration code}

The DurableOrchestrationContext class allows you to call other functions or manage the payload passed from the client that calls the orchestrator function. Its structure is shown in the following screenshot:

The most important methods exposed by this class are the following:

• CallActivityAsync and CallActivityWithRetryAsync ...