<h2>Batch Processing in Drupal 9.4 Explained </h2>
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<h3 data-start="386" data-end="407">Introduction</h3>
This in Drupal 9.4 has been significantly improved with enhancements to the Queue API. This feature enables developers to efficiently process large volumes of queued items in smaller, manageable batches, optimizing performance and resource usage. In this blog, we will explore how to implement a Queue Worker with batch processing in Drupal 9.4 using a step-by-step example.
<h3 data-start="799" data-end="845">Getting Started </h3>
Before implementing batch processing, we need to set up a custom module called customqueue that will contain our queue worker and batch processing logic. Follow these steps:
<h4>1. Creating the Custom Module</h4>
1. Create a new directory called customqueue in the modules/custom directory of your Drupal installation. 
2. Inside the customqueue directory, create a new file called customqueue.info.yml with the following contents:
&#8220;`yaml 
name: &#8216;customqueue&#8217; 
type: module 
description: &#8216;Example module for Queue Worker with Batch Processing&#8217; 
core_version_requirement: ^9 || ^10 
package: Custom 
dependencies: 
&#8211; php: ^7.3 
&#8220;`
3. Create another file called customqueue.services.yml with the following contents:
&#8220;`yaml 
services: 
customqueue.queue_worker: 
class: Drupal\customqueue\QueueWorker\MyCustomQueue 
arguments: [&#8216;@entity_type.manager&#8217;] 
tags: 
&#8211; { name: queue_worker } 
&#8220;`
4. Create the necessary directory structure and an empty file for the queue worker class: 
Create a directory called src inside the customqueue directory. Inside the src directory, create a directory called QueueWorker. Inside the QueueWorker directory, create a file called MyCustomQueue.php.
<h4>Implementing the Queue Worker</h4>
Now that we have our module set up, let’s implement the Queue Worker class.
Open the MyCustomQueue.php file and add the following code:
&#8220;`php 
 }
/** 
* {@inheritdoc} 
*/ 
public function processItem($data) { 
// Implement your custom processing logic here. 
// This method will be called for each item in the queue.
// Example: Updating an entity field value. 
$entity = $this-&gt;entityTypeManager-&gt;getStorage(&#8216;node&#8217;)-&gt;load($data[&#8216;nid&#8217;]); 
$entity-&gt;set(&#8216;field_status&#8217;, &#8216;processed&#8217;); 
$entity-&gt;save(); 
} 
} 
&#8220;`
In this example, we have defined a Queue Worker class called MyCustomQueue. The class extends the QueueWorkerBase class provided by Drupal core.
The @QueueWorker annotation is used to define the queue worker ID, title, and cron timing. Make sure to update the id and title values as per your requirements.
The processItem() method is called for each item in the queue. Inside this method, you can implement your custom processing logic. In this example, we load a node entity based on the provided nid and update a field value (field_status in this case).
<h4>Implementing</h4>
To add batch processing to our queue worker, we need to modify the processItem() method to utilize Drupal’s Batch API. The Batch API allows us to process items in smaller batches, reducing the strain on server resources.
Update the processItem() method in the MyCustomQueue class as follows:
&#8220;`php 
/** 
* {@inheritdoc} 
*/ 
public function processItem($data) { 
// Implement your custom processing logic here. 
// This method will be called for each item in the queue.
// Example: Updating an entity field value. 
$entity = $this-&gt;entityTypeManager-&gt;getStorage(&#8216;node&#8217;)-&gt;load($data[&#8216;nid&#8217;]); 
$entity-&gt;set(&#8216;field_status&#8217;, &#8216;processed&#8217;); 
$entity-&gt;save();
// Batch processing. 
$batch = [ 
&#8216;operations&#8217; =&gt; [ 
[[get_class($this), &#8216;processItem&#8217;], [$data]], 
], 
&#8216;finished&#8217; =&gt; [get_class($this), &#8216;finishedCallback&#8217;], 
&#8216;title&#8217; =&gt; t(&#8216;Processing queue items&#8230;&#8217;), 
&#8216;init_message&#8217; =&gt; t(&#8216;Starting processing&#8230;&#8217;), 
&#8216;progress_message&#8217; =&gt; t(&#8216;Processed @current out of @total.&#8217;), 
];
batch_set($batch); 
}
/** 
* Batch processing finished callback. 
*/ 
public static function finishedCallback($success, $results, $operations) { 
if ($success) { 
// Batch processing completed successfully. 
// Perform any additional actions here. 
} else { 
// Batch processing failed. 
// Log or handle errors here. 
} 
} 
&#8220;`
In this updated code, we have added the necessary code for batch processing:
After updating the entity field value, we define a $batch array that contains information about the batch process. The operations key holds an array of operations to be executed in each batch. In our case, we include the processItem() method itself as the operation and pass the $data parameter to it. The finished key specifies the callback method to be called when the batch processing is finished. We have defined a finishedCallback() method that handles any post-processing actions. The title, init_message, and progress_message keys define the messages displayed during the batch processing.
Finally, we call batch_set() and pass the $batch array to initiate the batch processing.
<h4>Benefits in Drupal 9.4</h4>
It significantly improves system efficiency by: 
✔ Reducing resource load on the server. 
✔ Ensuring scalability when handling large datasets. 
✔ Enhancing execution reliability with logging and structured processing.
<h2 data-start="5279" data-end="5298">Conclusion</h2>
By utilizing Queue API and Batch API, developers can optimize background processing in Drupal 9.4. Implementing batch processing ensures efficient task execution, especially for large-scale operations. When combined with<a href="https://cloudastra.co/blogs/efficient-batch-aws-processing-in-the-cloud-with-aws-batch"> cloud-based solutions like AWS Batch</a>, this approach enhances performance, scalability, and reliability for processing-intensive applications.
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Blog Details

Implementing Batch Processing in Drupal 9.4 Queue Worker