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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.Marshaller;
19  import org.jboss.netty.channel.Channel;
20  import org.jboss.netty.channel.ChannelHandler.Sharable;
21  import org.jboss.netty.channel.ChannelHandlerContext;
22  import org.jboss.netty.handler.codec.oneone.OneToOneEncoder;
23  
24  /**
25   * {@link OneToOneEncoder} implementation which uses JBoss Marshalling to marshal
26   * an Object.
27   *
28   * See <a href="http://www.jboss.org/jbossmarshalling">JBoss Marshalling website</a>
29   * for more informations
30   *
31   * Use {@link MarshallingEncoder} if possible.
32   *
33   */
34  @Sharable
35  public class CompatibleMarshallingEncoder extends OneToOneEncoder {
36  
37      private final MarshallerProvider provider;
38  
39      /**
40       * Create a new instance of the {@link CompatibleMarshallingEncoder}
41       *
42       * @param provider  the {@link MarshallerProvider} to use to get the {@link Marshaller} for a {@link Channel}
43       */
44      public CompatibleMarshallingEncoder(MarshallerProvider provider) {
45          this.provider = provider;
46      }
47  
48      @Override
49      protected Object encode(ChannelHandlerContext ctx, Channel channel, Object msg) throws Exception {
50          Marshaller marshaller = provider.getMarshaller(ctx);
51          ChannelBufferByteOutput output =
52                  new ChannelBufferByteOutput(ctx.getChannel().getConfig().getBufferFactory(), 256);
53          marshaller.start(output);
54          marshaller.writeObject(msg);
55          marshaller.finish();
56          marshaller.close();
57  
58          return output.getBuffer();
59      }
60  }