Making it easier to supply async http configuration.

core/src/main/java/software/amazon/awssdk/core/client/builder/AsyncClientBuilder.java

@@ -17,6 +17,7 @@
 
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.ScheduledExecutorService;
+import java.util.function.Consumer;
 
 /**
  * This includes required and optional override configuration required by every async client builder. An instance can be acquired
@@ -49,4 +50,20 @@ public interface AsyncClientBuilder<B extends AsyncClientBuilder<B, C>, C>
      * finished with it, the SDK will only close HTTP clients that it creates.
      */
     B asyncHttpConfiguration(ClientAsyncHttpConfiguration asyncHttpConfiguration);
+
+    /**
+     * Configures the HTTP client used by the service client.
+     *
+     * Allows just specifying the builder parameters without having to instantiate a builder and call <code>build</code> on it.
+     * For example
+     *
+     * <pre><code>
+     *     builder().asyncHttpConfiguration(b -> b.httpClient(client));
+     * </code></pre>
+     *
+     * @see #asyncHttpConfiguration(ClientAsyncHttpConfiguration)
+     */
+    default B asyncHttpConfiguration(Consumer<ClientAsyncHttpConfiguration.Builder> asyncHttpConfiguration) {
+        return asyncHttpConfiguration(ClientAsyncHttpConfiguration.builder().apply(asyncHttpConfiguration).build());
+    }
 }

core/src/main/java/software/amazon/awssdk/core/client/builder/ClientAsyncHttpConfiguration.java

@@ -124,6 +124,7 @@ public interface Builder extends CopyableBuilder<Builder, ClientAsyncHttpConfigu
          */
         // This intentionally returns SdkBuilder so that only httpClient or httpClientFactory may be supplied.
         SdkBuilder<?, ClientAsyncHttpConfiguration> httpClientFactory(SdkAsyncHttpClientFactory sdkClientFactory);
+
     }
 
     /**

http-clients/netty-nio-client/src/main/java/software/amazon/awssdk/http/nio/netty/NettySdkHttpClientFactory.java

@@ -22,6 +22,7 @@
 import io.netty.channel.EventLoopGroup;
 import java.time.Duration;
 import java.util.Optional;
+import java.util.function.Consumer;
 import software.amazon.awssdk.annotations.Immutable;
 import software.amazon.awssdk.http.SdkHttpConfigurationOption;
 import software.amazon.awssdk.http.async.SdkAsyncHttpClient;
@@ -169,6 +170,16 @@ public interface Builder extends CopyableBuilder<Builder, NettySdkHttpClientFact
          */
         Builder eventLoopGroupConfiguration(EventLoopGroupConfiguration eventLoopGroupConfiguration);
 
+        /**
+         * Configuration for the Netty {@link EventLoopGroup} which multiplexes IO events.
+         *
+         * @param eventLoopGroupConfiguration consumer that allows a {@link EventLoopGroupConfiguration.Builder} to be mutated.
+         * @return This builder for method chaining.
+         * @see #eventLoopGroupConfiguration(EventLoopGroupConfiguration)
+         */
+        default Builder eventLoopGroupConfiguration(Consumer<EventLoopGroupConfiguration.Builder> eventLoopGroupConfiguration) {
+            return eventLoopGroupConfiguration(EventLoopGroupConfiguration.builder().apply(eventLoopGroupConfiguration).build());
+        }
     }
 
     private static final class DefaultBuilder implements Builder {