Expose EventLoopGroup on DefaultAsyncHttpClient, close AsyncHttpClient#1221

Author: slandelle

client/src/main/java/org/asynchttpclient/DefaultAsyncHttpClient.java

@@ -17,6 +17,7 @@
 package org.asynchttpclient;
 
 import static org.asynchttpclient.util.Assertions.assertNotNull;
+import io.netty.channel.EventLoopGroup;
 import io.netty.util.HashedWheelTimer;
 import io.netty.util.Timer;
 
@@ -247,6 +248,10 @@ public ChannelPool getChannelPool() {
         return channelManager.getChannelPool();
     }
 
+    public EventLoopGroup getEventLoopGroup() {
+        return channelManager.getEventLoopGroup();
+    }
+
     protected BoundRequestBuilder requestBuilder(String method, String url) {
         return new BoundRequestBuilder(this, method, config.isDisableUrlEncodingForBoundRequests()).setUrl(url).setSignatureCalculator(signatureCalculator);
     }

client/src/main/java/org/asynchttpclient/netty/channel/ChannelManager.java

@@ -487,4 +487,8 @@ public void drainChannelAndOffer(final Channel channel, final NettyResponseFutur
     public ChannelPool getChannelPool() {
         return channelPool;
     }
+
+    public EventLoopGroup getEventLoopGroup() {
+        return eventLoopGroup;
+    }
 }