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Azure

Azure Durable Functions

Introduction

Azure Durable Functions is an extension of Azure Functions that allow developers to write stateful, long-running functions in a serverless environment. It enables developers to create code in an imperative style, as opposed to the traditional event-driven style of Azure Functions.

Durable Functions offers several features that help in building stateful, long-running functions, such as:

  1. Durable orchestration functions: This allows developers to express complex, multi-step workflows as a series of stateful function calls.
  2. Durable entities: it allows developers to implement stateful entities that can be used by orchestration functions.
  3. Durable timers: enables developers to set timers within an orchestration function, which allows for pausing execution and resuming later.

To start using Durable Functions, developers will need to create a new Azure Functions project and install the Durable Functions extension. Then, developers can create new functions using the Durable Functions template.

The Durable Functions SDK provides a set of high-level APIs that make it easy to implement complex, stateful logic in functions. Additionally, Durable Functions have a built-in web interface that allows developers to monitor and manage their functions, including viewing the status of active orchestrations and replaying completed ones. Overall, Azure Durable Functions is a powerful tool for building stateful, long-running functions in a serverless environment, it provides a set of high-level APIs and a built-in web interface that make it easy to implement complex logic and manage functions.

Example

Here’s an example of an orchestration function written in Python that takes an input message, processes it, and then sends an output message:
Azure-01

This example shows how to use the DurableOrchestrationClient to call activity functions and manage the workflow.
Here is an example of how to use Durable Entities in Python:

Azure-02

This example shows how to use the DurableEntityClient to define and manage an entity.
As you can see, the syntax for Durable Functions in Python is similar to the one in C#. The main difference is the use of the async and await keywords. Durable Functions in Python allows you to build stateful, long-running functions in a serverless environment, making it easy to implement complex workflows and handle states.

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