Implement Unit Tests, add Readme, add examples, stronger implementation

src/Context.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace Toalett\Multiprocessing;
+
+use Evenement\EventEmitterInterface;
+use Evenement\EventEmitterTrait;
+use React\EventLoop\LoopInterface;
+
+class Context implements EventEmitterInterface
+{
+	public const GC_INTERVAL = 120;
+	public const CLEANUP_INTERVAL = 5;
+	use EventEmitterTrait;
+
+	private LoopInterface $eventLoop;
+	private ConcurrencyLimit $limit;
+	private Workers $workers;
+
+	public function __construct(LoopInterface $eventLoop, ConcurrencyLimit $limit, ?Workers $workers = null)
+	{
+		$this->eventLoop = $eventLoop;
+		$this->limit = $limit;
+		$this->workers = $workers ?? new Workers();
+
+		$this->eventLoop->futureTick(fn() => $this->emit('booted'));
+		$this->eventLoop->futureTick(fn() => gc_enable());
+		$this->eventLoop->addPeriodicTimer(self::CLEANUP_INTERVAL, fn() => $this->workers->cleanup());
+		$this->eventLoop->addPeriodicTimer(self::GC_INTERVAL, fn() => gc_collect_cycles());
+
+		$this->workers->on('worker_started', fn(int $pid) => $this->emit('worker_started', [$pid]));
+		$this->workers->on('worker_stopped', fn(int $pid) => $this->emit('worker_stopped', [$pid]));
+		$this->workers->on('worker_stopped', fn() => $this->emitIf($this->workers->empty(), 'no_workers_remaining'));
+	}
+
+	public function submit(callable $task, ...$args): void
+	{
+		$this->eventLoop->futureTick(function () use ($task, $args) {
+			if ($this->limit->isReachedBy(count($this->workers))) {
+				$this->emit('congestion');
+				$this->workers->awaitCongestionRelief();
+				$this->emit('congestion_relieved');
+			}
+			$this->workers->createWorkerFor($task, $args);
+		});
+	}
+
+	public function run(): void
+	{
+		$this->eventLoop->run();
+	}
+
+	public function stop(): void
+	{
+		$this->eventLoop->futureTick(function()  {
+			$this->eventLoop->stop();
+			$this->workers->stop();
+			$this->emit('stopped');
+		});
+	}
+
+	public function emitIf(bool $condition, string $event, ...$args): void
+	{
+		if ($condition) {
+			$this->emit($event, $args);
+		}
+	}
+}