Produce EventLoopGroup build item

extensions/netty/deployment/src/main/java/io/quarkus/netty/deployment/EventLoopGroupBuildItem.java

@@ -0,0 +1,30 @@
+package io.quarkus.netty.deployment;
+
+import java.util.function.Supplier;
+
+import io.netty.channel.EventLoopGroup;
+import io.quarkus.builder.item.SimpleBuildItem;
+
+/**
+ * Provides suppliers that return EventLoopGroup used by the application.
+ *
+ * See EventLoopSupplierBuildItem to register custom EventLoopGroup
+ */
+public final class EventLoopGroupBuildItem extends SimpleBuildItem {
+    private final Supplier<EventLoopGroup> bossEventLoopGroup;
+    private final Supplier<EventLoopGroup> mainEventLoopGroup;
+
+    public EventLoopGroupBuildItem(Supplier<EventLoopGroup> boss, Supplier<EventLoopGroup> main) {
+        this.bossEventLoopGroup = boss;
+        this.mainEventLoopGroup = main;
+    }
+
+    public Supplier<EventLoopGroup> getBossEventLoopGroup() {
+        return bossEventLoopGroup;
+    }
+
+    public Supplier<EventLoopGroup> getMainEventLoopGroup() {
+        return mainEventLoopGroup;
+    }
+
+}

extensions/netty/deployment/src/main/java/io/quarkus/netty/deployment/EventLoopSupplierBuildItem.java

@@ -5,6 +5,12 @@
 import io.netty.channel.EventLoopGroup;
 import io.quarkus.builder.item.SimpleBuildItem;
 
+/**
+ * Register EventLoopGroup suppliers to be used to produce main EventLoopGroup and boss EventLoopGroup annotated beans.
+ * If not provided, both will be created from a default supplier.
+ *
+ * See EventLoopGroupBuildItem for actual supplier instances
+ */
 public final class EventLoopSupplierBuildItem extends SimpleBuildItem {
 
     private final Supplier<EventLoopGroup> mainSupplier;

extensions/netty/deployment/src/main/java/io/quarkus/netty/deployment/NettyProcessor.java

@@ -180,9 +180,10 @@ public void eagerlyInitClass(NettyRecorder recorder) {
     @Record(ExecutionTime.RUNTIME_INIT)
     void registerEventLoopBeans(BuildProducer<SyntheticBeanBuildItem> syntheticBeans,
             Optional<EventLoopSupplierBuildItem> loopSupplierBuildItem,
-            NettyRecorder recorder) {
-        Supplier<Object> boss;
-        Supplier<Object> main;
+            NettyRecorder recorder,
+            BuildProducer<EventLoopGroupBuildItem> eventLoopGroups) {
+        Supplier<EventLoopGroup> boss;
+        Supplier<EventLoopGroup> main;
         if (loopSupplierBuildItem.isPresent()) {
             boss = (Supplier) loopSupplierBuildItem.get().getBossSupplier();
             main = (Supplier) loopSupplierBuildItem.get().getMainSupplier();
@@ -209,6 +210,8 @@ void registerEventLoopBeans(BuildProducer<SyntheticBeanBuildItem> syntheticBeans
                 .unremovable()
                 .setRuntimeInit()
                 .done());
+
+        eventLoopGroups.produce(new EventLoopGroupBuildItem(boss, main));
     }
 
     @BuildStep

extensions/netty/runtime/src/main/java/io/quarkus/netty/runtime/NettyRecorder.java

@@ -35,8 +35,8 @@ public void run() {
         }).start();
     }
 
-    public Supplier<Object> createEventLoop(int nThreads) {
-        return new Supplier<Object>() {
+    public Supplier<EventLoopGroup> createEventLoop(int nThreads) {
+        return new Supplier<EventLoopGroup>() {
 
             volatile EventLoopGroup val;