Operations 

See Operations for explanation.

Custom operations can be registered using the PHP attribute \KM2\DataSeeder\Attribute\Operation . Operation can not be used to manipulate seeding data. See Events for data manipulation.

Operation is executed before data seeding. 
<?php

namespace MyVendor\MyExtension\Operation;

use KM2\DataSeeder\Attribute\Operation;
use KM2\DataSeeder\Operation\OperationInterface;

#[Operation(identifier: 'my-custom-operation', beforeDataSeeding: true)]
class MyCustomOperation implements OperationInterface
{
    public function run(Configuration $configuration, VariableCollection $variables, ?RootNode $rootNode): void
    {
        // $rootNode is null for operations executed before data seeding.
        echo "This operation is executed before data seeding.";
    }
}
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Operation is executed after data seeding. 
<?php

namespace MyVendor\MyExtension\Operation;

use KM2\DataSeeder\Attribute\Operation;
use KM2\DataSeeder\Operation\OperationInterface;

#[Operation(identifier: 'my-custom-operation')]
class MyCustomOperation implements OperationInterface
{
    public function run(Configuration $configuration, VariableCollection $variables, ?RootNode $rootNode): void
    {
        echo "This operation is executed after data seeding.";
    }
}
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