Add a no-args constructor for simple use cases

src/main/java/org/jboss/netty/channel/socket/nio/NioClientSocketChannelFactory.java

@@ -87,6 +87,15 @@ 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

src/main/java/org/jboss/netty/channel/socket/nio/NioDatagramChannelFactory.java

@@ -79,6 +79,15 @@ 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

src/main/java/org/jboss/netty/channel/socket/nio/NioServerSocketChannelFactory.java

@@ -89,6 +89,15 @@ 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 *

src/main/java/org/jboss/netty/channel/socket/oio/OioClientSocketChannelFactory.java

@@ -16,6 +16,7 @@
 package org.jboss.netty.channel.socket.oio;
 
 import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
 import java.util.concurrent.RejectedExecutionException;
 
 import org.jboss.netty.channel.Channel;
@@ -76,6 +77,15 @@ 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.
      *

src/main/java/org/jboss/netty/channel/socket/oio/OioServerSocketChannelFactory.java

@@ -16,6 +16,7 @@
 package org.jboss.netty.channel.socket.oio;
 
 import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
 import java.util.concurrent.RejectedExecutionException;
 
 import org.jboss.netty.channel.Channel;
@@ -89,6 +90,15 @@ 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.
      *