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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package org.jboss.netty.handler.codec.marshalling;
17  
18  import org.jboss.marshalling.MarshallerFactory;
19  import org.jboss.marshalling.MarshallingConfiguration;
20  import org.jboss.marshalling.Unmarshaller;
21  import org.jboss.netty.channel.Channel;
22  import org.jboss.netty.channel.ChannelHandler;
23  import org.jboss.netty.channel.ChannelHandlerContext;
24  
25  /**
26   * {@link UnmarshallerProvider} which store a reference to the {@link Unmarshaller} in the
27   * {@link ChannelHandlerContext} via the {@link ChannelHandlerContext#setAttachment(Object)}
28   * method. So the same {@link Unmarshaller} will be used during the life-time of a {@link Channel}
29   * for the {@link ChannelHandler}'s {@link ChannelHandlerContext}.
30   *
31   *
32   */
33  public class ContextBoundUnmarshallerProvider extends DefaultUnmarshallerProvider {
34  
35      public ContextBoundUnmarshallerProvider(MarshallerFactory factory, MarshallingConfiguration config) {
36          super(factory, config);
37      }
38  
39      @Override
40      public Unmarshaller getUnmarshaller(ChannelHandlerContext ctx) throws Exception {
41          Unmarshaller unmarshaller = (Unmarshaller) ctx.getAttachment();
42          if (unmarshaller == null) {
43              unmarshaller = super.getUnmarshaller(ctx);
44              ctx.setAttachment(unmarshaller);
45          }
46          return unmarshaller;
47      }
48  
49  }