Overview Of Azure Function

Scenario: If you want to build the application before that you have to choose the framework then we need to learn how to deploy the framework onto the server then how to manage and maintain those server over time. It is not easy quick or efficient that is way we go for azure function.

Azure Function : It is easy way to build the application that you need using serverless function that scale automatically meet the requirement(Demand) no worrying about server and infrastructure.

If you are new to development then azure function help you to create application that accept http request for website processes product order via queue message react to data flowing from device like an IOT hub or just run simple schedule task since as your function scale automatically just write the function logic as your function that handle the rest of the things like Deployment, Maintenance so that your application running smooth.

You are paying only what you use.

You will write less code.

Manage less infrastructure 

Upfront cost(Purchasing is very easy for your own things) is very less. 

Notes: Let's assume your task is running and performing critical task.

for example building API or managing the message queue.

First Thing : Azure Function allow you to implement your system logic into available coed blocks and these code blocks are called as function. you can call the function at anytime if you want to response the critical task. 

Second Things : If the request is increase as azure function meet the requirement. If sometime request fall then automatically extra resource drop off. 

Where do all compute resource come automatically : Azure Functions hosting options 

What we can do with azure function :

Azure functions are best suited for small apps that contain event that can work independently for other websites. Some of the common azure functions are: scheduling the task, sending the mail, sending the notification, IoT data processing task, database cleanup, take the backup, order task executing, message.

What is trigger or event to run azure function :

Trigger is an object that tell to the azure function who it will be invoked.

If you want to execute a function every 5 minutes then you have to use timer trigger. 

Every function must be associate with one trigger.

Based on the task we have different types of trigger :

1. Timer Trigger (Execute a function based on scheduling task).

2. HTTP Trigger(Execute a function when HTTP request receive).

3. Blob  Trigger(EAF When file is uploaded or modified in azure blob storage).

4. Queue Trigger(EAF When message added into azure storage queue).

5. Azure Cosmos DB.

6. Event Hub.