Sequence

Sequence your tasks and make complex workflows more readable

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Summary

This repository contains a Chain of Responsability design pattern implementation built with PHP.

Requirements

This library requires PHP^8.3

Installation

Install Sequence using Composer:

composer require fonil/sequence

Usage

Create a Sequence instance and attach any type of payload through a simple interface:

$result = Sequence::run(FirstTask::class)
	->then(SecondTask::class)
	...
	->then(LastTask::class)
	->startWith('payload');

Tasks

Sequence requires at least a task to be run. You can attach any of the following entities as a task:

• Invokable Class
• Explicit Task
• Custom Class
• Static Method
• Closure / Callback / Callable

Invokable Class

class InvokableIncrementCounter
{
    public function __invoke(array $payload): array
    {
        $payload['counter']++;
        return $payload;
    }
}

$result = Sequence::run(InvokableIncrementCounter::class)
    ->startWith(['counter' => 0]);

echo json_encode($result);
// {"counter":1}

Explicit Task

class IncrementTask implements TaskInterface
{
    //...
    
    public function handle(mixed $payload = null): mixed
    {
        $payload['counter']++;
        return $payload;
    }
}

$result = Sequence::run(IncrementTask::class)
    ->startWith(['counter' => 0]);

echo json_encode($result);
// {"counter":1}

Custom Class

class IncrementCounter
{
    public function add(array $payload): array
    {
        $payload['counter']++;
        return $payload;
    }
}

$result = Sequence::run([IncrementCounter::class, 'add'])
    ->startWith(['counter' => 0]);

// OR

$result = Sequence::run([new IncrementCounter(), 'add'])
    ->startWith(['counter' => 0]);

echo json_encode($result);
// {"counter":1}

Static Method

class IncrementCounter
{
    public static function add(array $payload): array
    {
        $payload['counter']++;
        return $payload;
    }
}

$result = Sequence::run([IncrementCounter::class, 'add'])
    ->startWith(['counter' => 0]);

echo json_encode($result);
// {"counter":1}

Closure / Callback / Callable

$closure = function (array $payload): array {
    $payload['counter']++;
    return $payload;
};

$result = Sequence::run($closure)
    ->startWith(['counter' => 0]);

echo json_encode($result);
// {"counter":1}

Sequence Instance

$closure = function (array $payload): array {
    $payload['counter']++;
    return $payload;
};

$sequence = Sequence::run($closure)->then($closure);

$result = Sequence::run($sequence)
    ->startWith(['counter' => 0]);

echo json_encode($result);
// {"counter":2}

Examples

$result = Sequence::run($closure)			// 1st execution => $counter is 1
	->then(InvokableIncrementCounter::class)	// 2nd execution => $counter is 2
	->then([IncrementCounter::class, 'increment'])	// 3rd execution => $counter is 3
	->then(IncrementTask::class)			// 4th execution => $counter is 4
	->startWith(['counter' => 0]);

echo json_encode($result);
// {"counter":4}

Security Vulnerabilities

Please review our security policy on how to report security vulnerabilities:

PLEASE DON'T DISCLOSE SECURITY-RELATED ISSUES PUBLICLY

Supported Versions

Only the latest major version receives security fixes.

Reporting a Vulnerability

If you discover a security vulnerability within this project, please open an issue here. All security vulnerabilities will be promptly addressed.

License

The MIT License (MIT). Please see LICENSE file for more information.