Added ChannelPipeline.isAttached()

src/main/java/org/jboss/netty/channel/ChannelPipeline.java

@@ -415,6 +415,12 @@ public interface ChannelPipeline {
      */
     void attach(Channel channel, ChannelSink sink);
 
+    /**
+     * Returns {@code true} if and only if this pipeline is attached to
+     * a {@link Channel}.
+     */
+    boolean isAttached();
+
     /**
      * Converts this pipeline into an ordered {@link Map} whose keys are
      * handler names and whose values are handlers.

src/main/java/org/jboss/netty/channel/DefaultChannelPipeline.java

@@ -99,6 +99,10 @@ public class DefaultChannelPipeline implements ChannelPipeline {
         this.sink = sink;
     }
 
+    public boolean isAttached() {
+        return channel != null && sink != null;
+    }
+
     public synchronized void addFirst(String name, ChannelHandler handler) {
         if (name2ctx.isEmpty()) {
             init(name, handler);