content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 com.alibaba.jstorm.message.netty;
  
  import org.jboss.netty.channel.Channel;
  import org.jboss.netty.channel.ChannelHandlerContext;
  import org.jboss.netty.handler.codec.oneone.OneToOneEncoder;
  
  import backtype.storm.messaging.ControlMessage;
  import backtype.storm.messaging.TaskMessage;
  
  public class MessageEncoder extends OneToOneEncoder {
      @Override
      protected Object encode(ChannelHandlerContext ctx, Channel channel, Object obj) throws Exception {
          if (obj instanceof MessageBatch) {
              return ((MessageBatch) obj).buffer();
          }
  
          if (obj instanceof ControlMessage) {
              return ((ControlMessage) obj).buffer();
          }
  
          if (obj instanceof TaskMessage) {
              return ((TaskMessage) obj).buffer();
          }
          
          throw new RuntimeException("Unsupported encoding of object of class " + obj.getClass().getName());
      }
  
  }