[Workflow] Add EventNameTrait to compute event name strings in subscribers

src/Symfony/Component/Workflow/CHANGELOG.md

@@ -7,6 +7,7 @@ CHANGELOG
  * Add method `getEnabledTransition()` to `WorkflowInterface`
  * Automatically register places from transitions
  * Add support for workflows that need to store many tokens in the marking
+ * Add method `getName()` in event classes to build event names in subscribers 
 
 7.0
 ---

src/Symfony/Component/Workflow/Event/AnnounceEvent.php

@@ -17,6 +17,9 @@
 
 final class AnnounceEvent extends Event
 {
+    use EventNameTrait {
+        getNameForTransition as public getName;
+    }
     use HasContextTrait;
 
     public function __construct(object $subject, Marking $marking, ?Transition $transition = null, ?WorkflowInterface $workflow = null, array $context = [])

src/Symfony/Component/Workflow/Event/CompletedEvent.php

@@ -17,6 +17,9 @@
 
 final class CompletedEvent extends Event
 {
+    use EventNameTrait {
+        getNameForTransition as public getName;
+    }
     use HasContextTrait;
 
     public function __construct(object $subject, Marking $marking, ?Transition $transition = null, ?WorkflowInterface $workflow = null, array $context = [])

src/Symfony/Component/Workflow/Event/EnterEvent.php

@@ -17,6 +17,9 @@
 
 final class EnterEvent extends Event
 {
+    use EventNameTrait {
+        getNameForPlace as public getName;
+    }
     use HasContextTrait;
 
     public function __construct(object $subject, Marking $marking, ?Transition $transition = null, ?WorkflowInterface $workflow = null, array $context = [])

src/Symfony/Component/Workflow/Event/EnteredEvent.php

@@ -17,6 +17,9 @@
 
 final class EnteredEvent extends Event
 {
+    use EventNameTrait {
+        getNameForPlace as public getName;
+    }
     use HasContextTrait;
 
     public function __construct(object $subject, Marking $marking, ?Transition $transition = null, ?WorkflowInterface $workflow = null, array $context = [])

src/Symfony/Component/Workflow/Event/EventNameTrait.php

@@ -0,0 +1,61 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Workflow\Event;
+
+use Symfony\Component\Workflow\Exception\InvalidArgumentException;
+
+/**
+ * @author Nicolas Rigaud <squrious@protonmail.com>
+ *
+ * @internal
+ */
+trait EventNameTrait
+{
+    /**
+     * Gets the event name for workflow and transition.
+     *
+     * @throws InvalidArgumentException If $transitionName is provided without $workflowName
+     */
+    private static function getNameForTransition(?string $workflowName, ?string $transitionName): string
+    {
+        return self::computeName($workflowName, $transitionName);
+    }
+
+    /**
+     * Gets the event name for workflow and place.
+     *
+     * @throws InvalidArgumentException If $placeName is provided without $workflowName
+     */
+    private static function getNameForPlace(?string $workflowName, ?string $placeName): string
+    {
+        return self::computeName($workflowName, $placeName);
+    }
+
+    private static function computeName(?string $workflowName, ?string $transitionOrPlaceName): string
+    {
+        $eventName = strtolower(basename(str_replace('\\', '/', static::class), 'Event'));
+
+        if (null === $workflowName) {
+            if (null !== $transitionOrPlaceName) {
+                throw new \InvalidArgumentException('Missing workflow name.');
+            }
+
+            return sprintf('workflow.%s', $eventName);
+        }
+
+        if (null === $transitionOrPlaceName) {
+            return sprintf('workflow.%s.%s', $workflowName, $eventName);
+        }
+
+        return sprintf('workflow.%s.%s.%s', $workflowName, $eventName, $transitionOrPlaceName);
+    }
+}

src/Symfony/Component/Workflow/Event/GuardEvent.php

@@ -23,6 +23,10 @@
  */
 final class GuardEvent extends Event
 {
+    use EventNameTrait {
+        getNameForTransition as public getName;
+    }
+
     private TransitionBlockerList $transitionBlockerList;
 
     public function __construct(object $subject, Marking $marking, Transition $transition, ?WorkflowInterface $workflow = null)

src/Symfony/Component/Workflow/Event/LeaveEvent.php

@@ -17,6 +17,9 @@
 
 final class LeaveEvent extends Event
 {
+    use EventNameTrait {
+        getNameForPlace as public getName;
+    }
     use HasContextTrait;
 
     public function __construct(object $subject, Marking $marking, ?Transition $transition = null, ?WorkflowInterface $workflow = null, array $context = [])

src/Symfony/Component/Workflow/Event/TransitionEvent.php

@@ -17,6 +17,9 @@
 
 final class TransitionEvent extends Event
 {
+    use EventNameTrait {
+        getNameForTransition as public getName;
+    }
     use HasContextTrait;
 
     public function __construct(object $subject, Marking $marking, ?Transition $transition = null, ?WorkflowInterface $workflow = null, array $context = [])

src/Symfony/Component/Workflow/Tests/Event/EventNameTraitTest.php

@@ -0,0 +1,73 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Workflow\Tests\Event;
+
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Workflow\Event\AnnounceEvent;
+use Symfony\Component\Workflow\Event\CompletedEvent;
+use Symfony\Component\Workflow\Event\EnteredEvent;
+use Symfony\Component\Workflow\Event\EnterEvent;
+use Symfony\Component\Workflow\Event\GuardEvent;
+use Symfony\Component\Workflow\Event\LeaveEvent;
+use Symfony\Component\Workflow\Event\TransitionEvent;
+
+class EventNameTraitTest extends TestCase
+{
+    /**
+     * @dataProvider getEvents
+     *
+     * @param class-string $class
+     */
+    public function testEventNames(string $class, ?string $workflowName, ?string $transitionOrPlaceName, string $expected)
+    {
+        $name = $class::getName($workflowName, $transitionOrPlaceName);
+        $this->assertEquals($expected, $name);
+    }
+
+    public static function getEvents(): iterable
+    {
+        yield [AnnounceEvent::class, null, null, 'workflow.announce'];
+        yield [AnnounceEvent::class, 'post', null, 'workflow.post.announce'];
+        yield [AnnounceEvent::class, 'post', 'publish', 'workflow.post.announce.publish'];
+
+        yield [CompletedEvent::class, null, null, 'workflow.completed'];
+        yield [CompletedEvent::class, 'post', null, 'workflow.post.completed'];
+        yield [CompletedEvent::class, 'post', 'publish', 'workflow.post.completed.publish'];
+
+        yield [EnteredEvent::class, null, null, 'workflow.entered'];
+        yield [EnteredEvent::class, 'post', null, 'workflow.post.entered'];
+        yield [EnteredEvent::class, 'post', 'published', 'workflow.post.entered.published'];
+
+        yield [EnterEvent::class, null, null, 'workflow.enter'];
+        yield [EnterEvent::class, 'post', null, 'workflow.post.enter'];
+        yield [EnterEvent::class, 'post', 'published', 'workflow.post.enter.published'];
+
+        yield [GuardEvent::class, null, null, 'workflow.guard'];
+        yield [GuardEvent::class, 'post', null, 'workflow.post.guard'];
+        yield [GuardEvent::class, 'post', 'publish', 'workflow.post.guard.publish'];
+
+        yield [LeaveEvent::class, null, null, 'workflow.leave'];
+        yield [LeaveEvent::class, 'post', null, 'workflow.post.leave'];
+        yield [LeaveEvent::class, 'post', 'published', 'workflow.post.leave.published'];
+
+        yield [TransitionEvent::class, null, null, 'workflow.transition'];
+        yield [TransitionEvent::class, 'post', null, 'workflow.post.transition'];
+        yield [TransitionEvent::class, 'post', 'publish', 'workflow.post.transition.publish'];
+    }
+
+    public function testInvalidArgumentExceptionIsThrownIfWorkflowNameIsMissing()
+    {
+        $this->expectException(\InvalidArgumentException::class);
+
+        EnterEvent::getName(null, 'place');
+    }
+}