Function¶

type¶

• On-demand functions

• Scheduled functions

• Event-based functions

runtime¶

• Functions are hosted within Azure App Service

• App Service loads the Azure runtime

• On arrival of a request or the occurrence of a trigger, App Service

• loads the incoming payload
• reads the function.json file to find the function's bindings and trigger
• maps the incoming data to incoming parameters, and

• invokes the function with parameter values

• Once the function completes its execution, the value is passed back to the runtime by way of an outgoing parameter defined as a binding in the function.json file

• The function runtime returns the values to the caller

binding¶

Binding is the process of creating a connection between

• the incoming data and

• the Azure function along with

• mapping the data types

Connection type

• a single direction from runtime to function and vice versa or

• multi directional: transmit data between runtime and function in both directions

trigger¶

Trigger can

• invoke a function based on external events

• pass the incoming data, payload, and metadata to the function

Function Proxies¶

can be used to call multiple functions with with a single function URL

Durable Functions¶

output can be saved to local variable and the state is preserved