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 }