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Prevent Multiple Executions of a Console Command
Prevent Multiple Executions of a Console Command¶
New in version 3.2: The LockableTrait was introduced in Symfony 3.2.
A simple but effective way to prevent multiple executions of the same command in a single server is to use file locks. The Filesystem component provides a LockHandler class that eases the creation and release of these locks.
In addition, the Console component provides a PHP trait called LockableTrait
that adds two convenient methods to lock and release commands:
// ...
use Symfony\Component\Console\Command\LockableTrait;
class UpdateContentsCommand extends Command
{
use LockableTrait;
// ...
protected function execute(InputInterface $input, OutputInterface $output)
{
if (!$this->lock()) {
$output->writeln('The command is already running in another process.');
return 0;
}
// If you prefer to wait until the lock is released, use this:
// $this->lock(null, true);
// ...
// if not released explicitly, Symfony releases the lock
// automatically when the execution of the command ends
$this->release();
}
}
This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.