Add no-args constructor for simple use-cases

transport/src/main/java/io/netty/channel/socket/nio/NioClientSocketChannelFactory.java

@@ -86,6 +86,15 @@ public class NioClientSocketChannelFactory implements ClientSocketChannelFactory
     private final WorkerPool<NioWorker> workerPool;
     private final NioClientSocketPipelineSink sink;
 
+    /**
+     * Creates a new {@link NioClientSocketChannelFactory} which uses {@link Executors#newCachedThreadPool()} for the worker and boss executors.
+     *
+     * See {@link #NioClientSocketChannelFactory(Executor, Executor)}
+     */
+    public NioClientSocketChannelFactory() {
+        this(Executors.newCachedThreadPool(), Executors.newCachedThreadPool());
+    }
+    
     /**
      * Creates a new instance.  Calling this constructor is same with calling
      * {@link #NioClientSocketChannelFactory(Executor, Executor, int, int)} with

transport/src/main/java/io/netty/channel/socket/nio/NioDatagramChannelFactory.java

@@ -79,6 +79,17 @@ public class NioDatagramChannelFactory implements DatagramChannelFactory {
     private final NioDatagramPipelineSink sink;
     private final WorkerPool<NioDatagramWorker> workerPool;
 
+
+    /**
+     * Create a new {@link NioDatagramChannelFactory} with a {@link Executors#newCachedThreadPool()}.
+     *
+     * See {@link #NioDatagramChannelFactory(Executor)}
+     */
+    public NioDatagramChannelFactory() {
+        this(Executors.newCachedThreadPool());
+    }
+    
+    
     /**
      * Creates a new instance.  Calling this constructor is same with calling
      * {@link #NioDatagramChannelFactory(Executor, int)} with 2 * the number of

transport/src/main/java/io/netty/channel/socket/nio/NioServerSocketChannelFactory.java

@@ -89,6 +89,17 @@ public class NioServerSocketChannelFactory implements ServerSocketChannelFactory
     private final WorkerPool<NioWorker> workerPool;
     private final ChannelSink sink;
 
+    /**
+     * Create a new {@link NioServerSocketChannelFactory} using
+     * {@link Executors#newCachedThreadPool()} for the boss and worker.
+     * 
+     * See {@link #NioServerSocketChannelFactory(Executor, Executor)}
+     */
+    public NioServerSocketChannelFactory() {
+        this(Executors.newCachedThreadPool(), Executors.newCachedThreadPool());
+    }
+    
+    
     /**
      * Creates a new instance.  Calling this constructor is same with calling
      * {@link #NioServerSocketChannelFactory(Executor, Executor, int)} with 2 *

transport/src/main/java/io/netty/channel/socket/oio/OioClientSocketChannelFactory.java

@@ -16,6 +16,7 @@
 package io.netty.channel.socket.oio;
 
 import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
 import java.util.concurrent.RejectedExecutionException;
 
 import io.netty.channel.Channel;
@@ -75,6 +76,15 @@ public class OioClientSocketChannelFactory implements ClientSocketChannelFactory
     private final Executor workerExecutor;
     final OioClientSocketPipelineSink sink;
 
+    /**
+     * Creates a new instance with a {@link Executors#newCachedThreadPool()} as worker executor.
+     *
+     * See {@link #OioClientSocketChannelFactory(Executor)}
+     */
+    public OioClientSocketChannelFactory() {
+        this(Executors.newCachedThreadPool());
+    }
+    
     /**
      * Creates a new instance.
      *

transport/src/main/java/io/netty/channel/socket/oio/OioDatagramChannelFactory.java

@@ -16,6 +16,7 @@
 package io.netty.channel.socket.oio;
 
 import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
 import java.util.concurrent.RejectedExecutionException;
 
 import io.netty.channel.Channel;
@@ -74,6 +75,16 @@ public class OioDatagramChannelFactory implements DatagramChannelFactory {
     private final Executor workerExecutor;
     final OioDatagramPipelineSink sink;
 
+
+    /**
+     * Creates a new instance with a {@link Executors#newCachedThreadPool()} as worker executor.
+     *
+     * See {@link #OioDatagramChannelFactory(Executor)}
+     */
+    public OioDatagramChannelFactory() {
+        this(Executors.newCachedThreadPool());
+    }
+    
     /**
      * Creates a new instance.
      *

transport/src/main/java/io/netty/channel/socket/oio/OioServerSocketChannelFactory.java

@@ -16,6 +16,7 @@
 package io.netty.channel.socket.oio;
 
 import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
 import java.util.concurrent.RejectedExecutionException;
 
 import io.netty.channel.Channel;
@@ -88,6 +89,15 @@ public class OioServerSocketChannelFactory implements ServerSocketChannelFactory
     private final Executor workerExecutor;
     private final ChannelSink sink;
 
+    /**
+     * Create a new {@link OioServerSocketChannelFactory} with a {@link Executors#newCachedThreadPool()} for the boss and worker executor.
+     *
+     * See {@link #OioServerSocketChannelFactory(Executor, Executor)}
+     */
+    public OioServerSocketChannelFactory() {
+        this(Executors.newCachedThreadPool(), Executors.newCachedThreadPool());
+    }
+    
     /**
      * Creates a new instance.
      *