Coroutine Context API

Using Coroutines Contexts as Hierarchic Service Locators and Dependency Injection Containers.

Inspired by https://reactjs.org/docs/context.html

Install

composer require leocavalcante/coroutine-context-api

Usage

Provide

\Swoole\Coroutine\Context\provide(string $key, mixed $value): void

Sets a value to be consumed from children Coroutines based on a string.

use function Swoole\Coroutine\{run, Context\provide};

run(static function(): void {
    provide('message', 'Hello, World!');
});

Consume

\Swoole\Coroutine\Context\consume(string $key, [mixed $default]): mixed

Consumes the value from the given key.

use function Swoole\Coroutine\{run, Context\provide, Context\consume};

run(static function(): void {
    provide('message', 'Hello, World!');
    go(static fn() => print(consume('message') . PHP_EOL));
});

But, but...

Why is this different from passing parameters to function arguments?

The consume function can lookup through the nearest provided key in the Coroutine tree.

use function Swoole\Coroutine\{run, Context\provide, Context\consume};

run(static function(): void {
    provide('message', 'Hello, World!');
    go(static fn() =>
        go(static fn() =>
            go(static fn() =>
                print(consume('message') . PHP_EOL)
            )
        )
    );
});

Why is this different from globals?

It is not about global space being polluted, it is based on parent-child "Coroutine tree".

run(static function(): void {
    provide('message', 'Hello, World!');
    go(static fn() => print(consume('message') . PHP_EOL));
});

run(static function(): void {
    provide('message', 'Olá, Mundo!');
    go(static fn() => print(consume('message') . PHP_EOL));
});

run(static function(): void {
    go(static fn() => print(consume('message', $default = '你好, 世界!') . PHP_EOL));
});