Expose the isInputOpen() method in CoreSession interface.

Signed-off-by: Lachlan Roberts <lachlan@webtide.com>

jetty-websocket/websocket-core-common/src/main/java/org/eclipse/jetty/websocket/core/CoreSession.java

@@ -110,6 +110,11 @@ public interface CoreSession extends OutgoingFrames, Configuration
      */
     SocketAddress getRemoteAddress();
 
+    /**
+     * @return True if the websocket is open inbound
+     */
+    boolean isInputOpen();
+
     /**
      * @return True if the websocket is open outbound
      */
@@ -253,6 +258,12 @@ public interface CoreSession extends OutgoingFrames, Configuration
             return null;
         }
 
+        @Override
+        public boolean isInputOpen()
+        {
+            return true;
+        }
+
         @Override
         public boolean isOutputOpen()
         {

jetty-websocket/websocket-core-common/src/main/java/org/eclipse/jetty/websocket/core/internal/WebSocketCoreSession.java

@@ -183,6 +183,12 @@ public class WebSocketCoreSession implements IncomingFrames, CoreSession, Dumpab
         return getConnection().getEndPoint().getRemoteSocketAddress();
     }
 
+    @Override
+    public boolean isInputOpen()
+    {
+        return sessionState.isInputOpen();
+    }
+
     @Override
     public boolean isOutputOpen()
     {
@@ -416,8 +422,10 @@ public class WebSocketCoreSession implements IncomingFrames, CoreSession, Dumpab
     {
         if (!demanding)
             throw new IllegalStateException("FrameHandler is not demanding: " + this);
+
         if (!sessionState.isInputOpen())
             throw new IllegalStateException("FrameHandler input not open: " + this);
+
         connection.demand(n);
     }