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Example code of thatsus/laravel-redlock

Informations about the package laravel-redlock

Laravel RedLock

Provides a generic locking mechanism using Redis. Implements the locking standard proposed by Redis.

Acknowledgements

This library was originally built by LibiChai based on the Redlock algorithm developed by antirez. The library was reworked by the team at That's Us, Inc.

Installation

  1. composer require thatsus/laravel-redlock
  2. Add ThatsUs\RedLock\RedLockServiceProvider::class, to the providers array in config/app.php
  3. Enjoy!

It's Simple!

Set a lock on any scalar. If the lock() method returns false, you did not acquire the lock.

Store results of the lock() method. Use this value to release the lock with unlock().

Example

This example sets a lock on the key "1" with a 3 second expiration time.

If it acquired the lock, it does some work and releases the lock.

Refresh

Use refreshLock() to reacquire and extend the time of your lock.

Even Easier with Closures

Use runLocked() for nicer syntax. The method returns the results of the closure, or else false if the lock could not be acquired.

Refresh with Closures

You can easily refresh your tokens when using closures. The first parameter to your closure is $refresh. Simply call it when you want to refresh. If the lock cannot be refreshed, $refresh() will break out of the closure.

Lock Queue Jobs Easily

If you're running jobs on a Laravel queue, you may want to avoid queuing up the same job more than once at a time.

The ThatsUs\RedLock\Traits\QueueWithoutOverlap trait provides this functionality with very few changes to your job. Usually only two changes are necessary.

  1. use ThatsUs\RedLock\Traits\QueueWithoutOverlap as a trait
  2. Change the handle() method to handleSync()

Sometimes it's also necessary to specify a getLockKey() method. This method must return the string that needs to be locked.

This is typically unnecessary because the lock key can be generated automatically. But if the job's data is not easy to stringify, you must define the getLockKey() method.

This trait also provides a refresh method called refreshLock(). If refreshLock() is unable to refresh the lock, an exception is thrown and the job fails.

Finally, you can change the lock time-to-live from the default 300 seconds to another value using the $lock_time property.

Contribution

If you find a bug or want to contribute to the code or documentation, you can help by submitting an issue or a pull request.

License

MIT

All versions of laravel-redlock with dependencies

PHP Build Version
Package Version
Requires php Version >=5.4.0
illuminate/support Version ^5.0,<5.6
illuminate/console Version ^5.0,<5.6
predis/predis Version ^1.1
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