374611: do not redispatch if already dispatched when SSL reads content on write

jetty-client/src/main/java/org/eclipse/jetty/client/SelectConnector.java

@@ -276,6 +276,11 @@ class SelectConnector extends AggregateLifeCycle implements HttpClient.Connector
             _endp.shutdownOutput();
         }
 
+        public void dispatch()
+        {
+            _endp.asyncDispatch();
+        }
+
         public void asyncDispatch()
         {
             _endp.asyncDispatch();

jetty-io/src/main/java/org/eclipse/jetty/io/AsyncEndPoint.java

@@ -19,7 +19,14 @@ public interface AsyncEndPoint extends ConnectedEndPoint
 {
     /* ------------------------------------------------------------ */
     /**
-     * Dispatch the endpoint to a thread to attend to it.
+     * Dispatch the endpoint if it is not already dispatched
+     * 
+     */
+    public void dispatch();
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * Dispatch the endpoint. If it is already dispatched, schedule a redispatch
      * 
      */
     public void asyncDispatch();

jetty-io/src/main/java/org/eclipse/jetty/io/nio/SelectChannelEndPoint.java

@@ -208,11 +208,7 @@ public class SelectChannelEndPoint extends ChannelEndPoint implements AsyncEndPo
     {
         synchronized(this)
         {
-            if (_dispatched)
-            {
-                throw new IllegalStateException("dispatched");
-            }
-            else
+            if (!_dispatched)
             {
                 _dispatched = true;
                 boolean dispatched = _manager.dispatch(_handler);

jetty-io/src/main/java/org/eclipse/jetty/io/nio/SslConnection.java

@@ -412,7 +412,7 @@ public class SslConnection extends AbstractConnection implements AsyncConnection
 
             // If we are reading into the temp buffer and it has some content, then we should be dispatched.
             if (toFill==_unwrapBuf && _unwrapBuf.hasContent() && !_connection.isSuspended())
-                _aEndp.asyncDispatch();
+                _aEndp.dispatch();
         }
         finally
         {
@@ -721,6 +721,11 @@ public class SslConnection extends AbstractConnection implements AsyncConnection
             process(null, null);
         }
 
+        public void dispatch()
+        {
+            _aEndp.dispatch();
+        }
+
         public void asyncDispatch()
         {
             _aEndp.asyncDispatch();

jetty-spdy/spdy-jetty/src/main/java/org/eclipse/jetty/spdy/EmptyAsyncEndPoint.java

@@ -32,6 +32,11 @@ public class EmptyAsyncEndPoint implements AsyncEndPoint
     private boolean closed;
     private int maxIdleTime;
 
+    @Override
+    public void dispatch()
+    {
+    }
+    
     @Override
     public void asyncDispatch()
     {