throw stream close exception in array stream implementation

src/Store/ArrayStream.php

@@ -14,8 +14,8 @@
 /** @implements IteratorAggregate<Message> */
 final class ArrayStream implements Stream, IteratorAggregate
 {
-    /** @var Iterator<Message> $iterator */
-    private readonly Iterator $iterator;
+    /** @var Iterator<Message>|null $iterator */
+    private Iterator|null $iterator;
 
     /** @var positive-int|0|null */
     private int|null $position;
@@ -33,17 +33,26 @@ public function __construct(array $messages = [])
 
     public function close(): void
     {
+        $this->iterator = null;
     }
 
     /** @return Traversable<Message> */
     public function getIterator(): Traversable
     {
+        if ($this->iterator === null) {
+            throw new StreamClosed();
+        }
+
         return $this->iterator;
     }
 
     /** @return positive-int|0|null */
     public function position(): int|null
     {
+        if ($this->iterator === null) {
+            throw new StreamClosed();
+        }
+
         if ($this->position === null) {
             $this->iterator->key();
         }
@@ -58,6 +67,10 @@ public function position(): int|null
      */
     public function index(): int|null
     {
+        if ($this->iterator === null) {
+            throw new StreamClosed();
+        }
+
         if ($this->index === null) {
             $this->iterator->key();
         }
@@ -67,16 +80,28 @@ public function index(): int|null
 
     public function next(): void
     {
+        if ($this->iterator === null) {
+            throw new StreamClosed();
+        }
+
         $this->iterator->next();
     }
 
     public function end(): bool
     {
+        if ($this->iterator === null) {
+            throw new StreamClosed();
+        }
+
         return !$this->iterator->valid();
     }
 
     public function current(): Message|null
     {
+        if ($this->iterator === null) {
+            throw new StreamClosed();
+        }
+
         return $this->iterator->current() ?: null;
     }
 

src/Subscription/Engine/DefaultSubscriptionEngine.php

@@ -347,6 +347,7 @@ function (array $subscriptions) use ($limit): void {
                         }
                     }
                 } finally {
+                    $endIndex = $stream?->index();
                     $stream?->close();
 
                     if ($messageCounter > 0) {
@@ -381,7 +382,7 @@ function (array $subscriptions) use ($limit): void {
                 $this->logger?->info(
                     sprintf(
                         'Subscription Engine: End of stream on position "%d" has been reached, finish processing.',
-                        $stream->index() ?: 'unknown',
+                        $endIndex ?: 'unknown',
                     ),
                 );
             },

tests/Unit/Store/ArrayStreamTest.php

@@ -6,6 +6,7 @@
 
 use Patchlevel\EventSourcing\Message\Message;
 use Patchlevel\EventSourcing\Store\ArrayStream;
+use Patchlevel\EventSourcing\Store\StreamClosed;
 use Patchlevel\EventSourcing\Tests\Unit\Fixture\Email;
 use Patchlevel\EventSourcing\Tests\Unit\Fixture\ProfileCreated;
 use Patchlevel\EventSourcing\Tests\Unit\Fixture\ProfileId;
@@ -139,6 +140,8 @@ public function testWithNoList(): void
 
     public function testClose(): void
     {
+        $this->expectException(StreamClosed::class);
+
         $message = Message::create(
             new ProfileCreated(
                 ProfileId::fromString('foo'),
@@ -156,10 +159,6 @@ public function testClose(): void
         self::assertSame(false, $stream->end());
 
         $stream->close();
-
-        self::assertSame(1, $stream->index());
-        self::assertSame(0, $stream->position());
-        self::assertSame($message, $stream->current());
-        self::assertSame(false, $stream->end());
+        $stream->index();
     }
 }