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Informations about the package poller

Poller

Poller is a library designed for polling non-blocking stuff.

Build Status

Prerequisites

It's not a very common task for PHP but sometimes you really need to poll some things until they answer you something.

For example you can run other processes in the background and wait until they finish (you can use poller-symfony-process package for it to work with Symfony's Process component) or you can poll sockets or streams.

How to use

Suppose you have 10 processes that you need to run and you need to have only 3 processes running at the same time (only 3 job slots). To implement this you will need to write an implementation of Poller\Task\Task interface which will represent a single process or you can use already implemented ProcessTask from poller-symfony-process package.

This way you will just need to instantiate a new Poller\Task\TaskQueue and enqueue all your tasks in it.

Now you need to create a new Poller instance and pass it your queue object and how many tasks do you want to run simultaneously (how many job slots do you have):

And now you're ready to run the Poller:

Task events

You can also use events on Poller, we have:

You can attach your listeners using attachListener method, f.e.:

Tasks queue

As you already saw, Poller needs TaskQueue to get tasks from. But TaskQueue class that comes with Poller is pretty limited in a way that it's just a wrapper of SplQueue and it's not very extendable. What if, for example, you want to create a process that runs some tasks forever? The best case using TaskQueue could be adding new tasks on finish event, but it wouldn't be very readable.

Actually Poller accepts anything that implements Poller\Task\PollerTaskQueue interface. So you can easily implement infinite queue:

All versions of poller with dependencies

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