| /* |
| * Copyright 2014 Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.onlab.netty; |
| |
| import java.io.IOException; |
| |
| /** |
| * A unit of communication. |
| * Has a payload. Also supports a feature to respond back to the sender. |
| */ |
| public interface Message { |
| |
| /** |
| * Returns the payload of this message. |
| * @return message payload. |
| */ |
| public byte[] payload(); |
| |
| /** |
| * Sends a reply back to the sender of this message. |
| * @param data payload of the response. |
| * @throws IOException if there is a communication error. |
| */ |
| public void respond(byte[] data) throws IOException; |
| } |