Batching (aggregating) messages using batch receive and batch sender in a Logic App

Below is a step-by-step guide to create an Azure Logic App workflow that uses Batch Receive and Batch Sender actions to process XML messages. The workflow will:

Receive XML messages.
Add a root tag to the batched XML messages.
Send the final batched XML message via Gmail.

Step-by-Step Workflow

Step 1: Create the Batch Receiver Logic App

This Logic App will receive and process XML messages in batches.

Go to the Azure portal and create a new Logic App.
Add a Batch Trigger:
- Search for Batch and select When messages are received in a batch.
- Configure the batch settings:
  - Release criteria: Message count base
  - Message Count: 2
  - Mode: Inline
Add a Initialize variable set type: String and value: “</Employees>”.
Add a For Each loop to iterate through the batch of messages.
Inside the loop, add a Append to string variable action to process each XML message. For example:
- Value: @item()['content']
Add a Append to string variable action outside the loop to add a end root tag to the batched XML messages. For example:
Value: </Employees>
Add a Gmail action to send the final batched XML message:
- To: Enter the recipient’s email address.
- Subject: Batched Final Message
- Body: Here is the result of the batched message
  @{variables('rootName-Var')}

Step 2: Create the Batch Sender Logic App

This Logic App will send XML messages to the Batch Receiver.

Create another Logic App.
Add a trigger When a HTTP request is received.
Add a Batch Sender action:
- Search for Batch and select Send messages to batch.
- Configure the batch settings:
  - Batch Receiver: Select the Logic App created in Step 1.
  - Message Content: @triggerBody()

Here's how Logic Apps should look:

Batch Receiver Logic App

Batch Sender Logic App

Testing the Workflow

The Batch Sender will send the XML messages to the Batch Receiver.
The Batch Receiver will process the messages based on condition (e.g. message count = 2).
The Batch Receiver will add a root tag to the batched XML messages.
The Batch Receiver will send the final batched XML message via Gmail.

Sample Input

Batch Sender sends 2 XML messages:

  <message>
    <id>1</id>
    <name>John Doe</name>
  </message>

  <message>
    <id>2</id>
    <name>Jane Smith</name>
  </message>

Sample Output

The Batch Receiver will process the messages and add a root tag:

<Employees>
  <message>
    <id>1</id>
    <name>John Doe</name>
  </message>
  <message>
    <id>2</id>
    <name>Jane Smith</name>
  </message>
</Employees>

You can download the logic app template from the estudy247 GitHub repository – Batch Receiver: la-test-batch-15 and Batch Sender: la-test-batch-16

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