Dapr integration overview in Azure - Step-by-Step Execution

Process Flow - Dapr integration overview

Start Application

↓

Initialize Dapr Sidecar

↓

Application Sends Request

↓

Dapr Intercepts Request

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Dapr Calls Target Service or Component

↓

Response Returned via Dapr

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Application Receives Response

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End

This flow shows how an application uses Dapr sidecar to send and receive requests through Dapr, enabling easy integration with other services or components.

Execution Sample

Azure

app -> dapr sidecar -> service/component -> dapr sidecar -> app

This shows the path of a request from the app through Dapr to a service and back.

Process Table

Step	Action	Component	Result
1	Start Application	App	App is running and ready
2	Initialize Dapr Sidecar	Dapr Sidecar	Sidecar starts alongside app
3	App sends request	App	Request sent to Dapr sidecar
4	Dapr intercepts request	Dapr Sidecar	Request processed by Dapr
5	Dapr calls target service	Dapr Sidecar	Service receives request
6	Service processes request	Service	Service prepares response
7	Response sent back	Dapr Sidecar	Response routed back to app
8	App receives response	App	App processes response
9	End	App & Dapr	Request cycle complete

💡 Request cycle ends after app receives response

Status Tracker

Variable	Start	After Step 3	After Step 5	After Step 7	Final
Request	None	Sent to Dapr	Received by Service	Response sent back	Response received by App
Response	None	None	None	Sent to App	Processed by App

Key Moments - 3 Insights

Why does the application send requests to the Dapr sidecar instead of directly to the service?

Because Dapr sidecar handles service discovery, retries, and communication, simplifying the app code as shown in steps 3 and 4 of the execution_table.

What role does the Dapr sidecar play in the communication?

It acts as a proxy that intercepts requests and routes them to the correct service or component, as seen in steps 4 and 5.

When does the application receive the response?

After the service processes the request and sends the response back through Dapr, the app receives it at step 8.

Visual Quiz - 3 Questions

Look at the execution_table, at which step does the Dapr sidecar first handle the request?

A Step 4

B Step 3

C Step 5

D Step 6

💡 Hint

Check the 'Component' and 'Action' columns in execution_table rows 3 and 4.

According to variable_tracker, what is the state of the 'Response' variable after step 5?

A Sent to App

B None

C Processed by App

D Received by Service

💡 Hint

Look at the 'Response' row and the column 'After Step 5' in variable_tracker.

If the Dapr sidecar did not intercept the request, which step would be skipped?

A Step 7

B Step 3

C Step 4

D Step 8

💡 Hint

Refer to the execution_table to see where Dapr intercepts the request.

Concept Snapshot

Dapr integration overview:
- App runs with a Dapr sidecar
- App sends requests to sidecar
- Sidecar routes requests to services/components
- Responses return via sidecar to app
- Simplifies communication and adds features like retries

Full Transcript

This visual execution shows how an application integrates with Dapr. The app starts and runs alongside a Dapr sidecar. When the app sends a request, it goes first to the Dapr sidecar, which intercepts and processes it. The sidecar then calls the target service or component. The service processes the request and sends a response back through the sidecar. Finally, the app receives the response. This flow helps the app communicate easily and reliably with other services.