README

Sometimes you want to ensure that a Symfony console command does not run in parallel. This bundle adds an optional locking feature to all console commands that can be used to prevent parallel execution.

Installation

Install the bundle via Composer:

composer require matthimatiker/command-locking-bundle

Then register the bundle in your AppKernel:

<?php
// app/AppKernel.php

public function registerBundles()
{
    $bundles = array(
        // ...
        new \Matthimatiker\CommandLockingBundle\MatthimatikerCommandLockingBundle()
    );
    // ...
}

Usage

Simply pass the --lock option to any command to ensure that parallel runs are prohibited:

app/console cache:warmup --lock

If the command did not terminate yet and the same command is called again (in lock mode), then it is simply skipped and a notice is shown.

The default locking implementation relies on the filesystem and uses Symfony's LockHandler. This avoids parallel execution as long as your application runs on a single system. If you need a distributed lock, then you will have to write your own lock manager.

Custom Lock Managers

A custom lock manager must implement \Matthimatiker\CommandLockingBundle\Locking\LockManagerInterface. Afterwards it must be registered as service and tagged as matthimatiker_command_locking.console.lock_manager:

my.custom_lock_manager:
    class: My\Custom\LockManager
    tags:
        - { name: matthimatiker_command_locking.console.lock_manager, alias: custom }

An alias must be defined together with the tag (custom in this example) and is used to reference the new lock manager:

app/console cache:warmup --lock=custom

Known Issues

When sub-command are called as described in the official documentation, then locking cannot be used for the sub-commands as the life-cycle events are not fired.