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Example code of mouf/utils.common.lock

Informations about the package utils.common.lock

Lock Manager

The LockManager package is a simple package that provides functions to get a lock. Typically, you want to use locks when you want to be sure that 2 actions do not happen at the same time. For instance, if you regularly schedule cron tasks, you might want to be sure the last cron task is finished before running a new one. A lock can help you do that.

The Lock class

The Lock class represents a lock. You can acquire a lock to lock the resource and release the lock to set it free. Of course, if the lock has been already acquired by another user, you won't be able to acquire it yourself. You can optionnaly wait for the lock to be freed by the other process to acquire it yourself.

Internally, locks are acquired by putting a lock on a "file" that is hidden in the temp directory. When creating a Lock instance in Mouf, you will therefore have to find a unique temp name for that file.

If your PHP script crashes or exits without explicitly releasing the lock, the lock will be automatically released, so that other processes can use the lock.

Example

A first example: trying to acquire a lock without waiting

A second example: acquire a lock and wait if the lock is not available

Good practices

A good practice is to create the lock object via a dependency injection mechanism. This way, you can share instances of your lock accross services that require it. The Mouf framework let's you do that. Let's assume you create a "myLock" instance:

Your code to use the lock would look this:

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