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Php – Add workflow to a service dynamically in Symfony 6.4

The Symfony 6.4 docs state concerning the workflow registry:

Beware that injecting the Registry into your services is not
recommended.

However, I need to get a specific workflow within a service method which decides which workflow to use based on a key. I don’t know in advance which workflow to load, so I can’t inject a specific workflow. How can I do this? For now, I inject the registry. Could I somehow inject the service_container and get it from there later?

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2

Answers


  1. Chosen as BEST ANSWER
    0

    Here's my Solution:

        #WorkflowLoader.php
use PsrContainerContainerExceptionInterface;
use PsrContainerContainerInterface;
use PsrContainerNotFoundExceptionInterface;
use SymfonyComponentDependencyInjectionAttributeTaggedLocator;
use SymfonyComponentWorkflowWorkflow;
use RuntimeException;

class WorkflowLoader
{
    public function __construct(
        #[TaggedLocator('workflow')] private readonly ContainerInterface $serviceLocator
    )
    {
    }

    public function getWorkflow($workflowName): Workflow
    {
        try {
            if (!$workflow = $this->serviceLocator->get('state_machine.' . $workflowName)) {
                $workflow = $this->serviceLocator->get('workflow.' . $workflowName);
            }
        } catch (NotFoundExceptionInterface|ContainerExceptionInterface $e) {
            throw new RuntimeException("Process Workflow $workflowName could not be loaded. n" . $e->getMessage());
        }
        return $workflow;
    }
}

  2. 0

    You can use service locators to access every workflows.

    It’s mentioned in the documentation:

    If you want to retrieve all workflows, for documentation purposes for example, you can inject all services with the following tag:

    workflow: all workflows and all state machine;
workflow.workflow: all workflows;
workflow.state_machine: all state machines.

    It’s possible to do it easily with Symfony 6/7 using locator attribute:

    public function __construct(
    #[TaggedLocator('workflow')] private ContainerInterface $workflowsAndStateMachinesLocator,
    #[TaggedLocator('workflow.workflow')] private ContainerInterface $workflowsLocator,
    #[TaggedLocator('workflow.state_machine')] private ContainerInterface $stateMachinesLocator,
) {
}
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