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vendor/symfony/console/Command/LockableTrait.php

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+<?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\Console\Command;
+
+use Symfony\Component\Console\Exception\LogicException;
+use Symfony\Component\Lock\Factory;
+use Symfony\Component\Lock\Lock;
+use Symfony\Component\Lock\Store\FlockStore;
+use Symfony\Component\Lock\Store\SemaphoreStore;
+
+/**
+ * Basic lock feature for commands.
+ *
+ * @author Geoffrey Brier <geoffrey.brier@gmail.com>
+ */
+trait LockableTrait
+{
+    /** @var Lock */
+    private $lock;
+
+    /**
+     * Locks a command.
+     *
+     * @return bool
+     */
+    private function lock($name = null, $blocking = false)
+    {
+        if (!class_exists(SemaphoreStore::class)) {
+            throw new LogicException('To enable the locking feature you must install the symfony/lock component.');
+        }
+
+        if (null !== $this->lock) {
+            throw new LogicException('A lock is already in place.');
+        }
+
+        if (SemaphoreStore::isSupported()) {
+            $store = new SemaphoreStore();
+        } else {
+            $store = new FlockStore();
+        }
+
+        $this->lock = (new Factory($store))->createLock($name ?: $this->getName());
+        if (!$this->lock->acquire($blocking)) {
+            $this->lock = null;
+
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Releases the command lock if there is one.
+     */
+    private function release()
+    {
+        if ($this->lock) {
+            $this->lock->release();
+            $this->lock = null;
+        }
+    }
+}