commit21

app/Services/ReplenishmentProcessLock.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace App\Services;
+
+use RuntimeException;
+
+/** Local process exclusion; OS releases the lock if a worker is terminated. */
+class ReplenishmentProcessLock
+{
+    /** @var resource|null */
+    private $handle = null;
+
+    public function acquire(): bool
+    {
+        if ($this->handle !== null) {
+            throw new RuntimeException('Verificação periódica já adquirida nesta instância.');
+        }
+        $handle = fopen(storage_path('framework/replenishment-command.lock'), 'c');
+        if ($handle === false) {
+            throw new RuntimeException('Não foi possível abrir o controlo da verificação periódica.');
+        }
+        if (! flock($handle, LOCK_EX | LOCK_NB)) {
+            fclose($handle);
+
+            return false;
+        }
+        $this->handle = $handle;
+
+        return true;
+    }
+
+    public function release(): void
+    {
+        if ($this->handle !== null) {
+            flock($this->handle, LOCK_UN);
+            fclose($this->handle);
+            $this->handle = null;
+        }
+    }
+
+    public function __destruct()
+    {
+        $this->release();
+    }
+}