Waitable

The Waitable class is used for asynchronous computing. A Waitable object has three states

• Fulfilled
• Rejected
• Running: This is the default state when it's created

This class is analogue to JavaScript Promise class

Installation

You can install this library from Composer executing the following commands composer require srdestino/waitable then all you have to do is use this as in the following examples

Usage

Create a new Waitable

$waitable = new Waitable(function (IWaitable $waitable){
  LongTask();
  $waitable->Resolve(null); // When you call this method it will mark the Waitable as Fulfilled
});

This will create a new Waitable and the function we pass to the constructor will be executed asynchronously

Wait until the Waitable is resolved

$waitable = new Waitable(function (IWaitable $waitable){
  $waitable->Resolve("Test"); // When you call this method it will mark the waitable as Fulfilled
});

$result = $waitable->Wait();
echo $result; // It will print "Test"

Wait until all waitables are resolved

$firstWaitable = new Waitable(function (IWaitable $waitable){
    $waitable->Resolve("First value");
});
$secondWaitable = new Waitable(function (IWaitable $waitable) use($secondValue){
    $waitable->Resolve("Second value");
});
list($firstResult, $secondResult) = Waitable::WaitAll([$firstWaitable, $secondWaitable]);

echo $firstResult; // "First value"
echo $secondResult; // "Second value"

The static method WaitAll receives an array of IWaitable and wait until all are fulfilled. This method will return an array with the values returned by all the waitables.

Collaborating & Getting Help

This is an open source library, so you can collaborate if you want, feel free to create Pull Request or open an issue in case you need help or want to suggest something.

Apache

If you want to enable pcntl in Apache you can refer to the following post I wrote in medium

https://medium.com/@jhuertasdeveloper/how-to-enable-pcntl-in-apache-56c6f6f0cbab