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Advanced Serverless Architectures with Microsoft Azure

You're reading from   Advanced Serverless Architectures with Microsoft Azure Design complex serverless systems quickly with the scalability and benefits of Azure

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Product type Paperback
Published in Feb 2019
Publisher Packt
ISBN-13 9781788479127
Length 278 pages
Edition 1st Edition
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Author (1):
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Daniel Bass Daniel Bass
Author Profile Icon Daniel Bass
Daniel Bass
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Toc

Interacting with Humans in Azure Durable Functions


Humans tend to be unpredictable and asynchronous in completing a task compared to a computing service. Consider the comparison between a message arriving on a queue for an Azure Function and a message arriving on a phone for a human. It is fairly certain that the Azure Function will complete that operation almost immediately, whereas the human is likely to have a random amount of delay as they get occupied with other work.

If we are trying to complete an order workflow while depending on human input (for example, authorizing the order or packing the shipping crate), then we are creating a set of distributed transactions. The general name for this is a "Saga". There are two broad approaches to working with this:

  • Orchestration: This refers to having a long-running process that requires the first task to be completed, and then the second, and so on.

  • Choreography: In this approach, each individual microservice handles a task and publishes an...

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