Add factory to build EventLoop, Client, DNSResolver

This allow to simplify the process of react instance creation

Author: shulard

src/ReactFactory.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace Http\Adapter;
+
+use React\EventLoop\LoopInterface;
+use React\EventLoop\Factory as EventLoopFactory;
+use React\Dns\Resolver\Resolver as DnsResolver;
+use React\Dns\Resolver\Factory as DnsResolverFactory;
+use React\HttpClient\Factory as HttpClientFactory;
+use React\HttpClient\Client as HttpClient;
+
+/**
+ * Factory wrapper for React instances
+ * @author Stéphane Hulard <[email protected]>
+ */
+class ReactFactory
+{
+    /**
+     * Build a react Event Loop
+     * @return LoopInterface
+     */
+    public static function buildEventLoop()
+    {
+        return EventLoopFactory::create();
+    }
+
+    /**
+     * Build a React Dns Resolver
+     * @param  LoopInterface $loop
+     * @param  string        $dns
+     * @return DnsResolver
+     */
+    public static function buildDnsResolver(
+        LoopInterface $loop,
+        $dns = '8.8.8.8'
+    ) {
+        $factory = new DnsResolverFactory();
+        return $factory->createCached($dns, $loop);
+    }
+
+    /**
+     * Build a React Http Client
+     * @param  LoopInterface $loop
+     * @param  Resolver      $dns
+     * @return HttpClient
+     */
+    public static function buildHttpClient(
+        LoopInterface $loop,
+        DnsResolver $dns = null
+    ) {
+        if( null === $dns ) {
+            $dns = self::buildDnsResolver($loop);
+        }
+
+        $factory = new HttpClientFactory();
+        return $factory->create($loop, $dns);
+    }
+}