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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.marshalling.MarshallerFactory;
20  import org.jboss.marshalling.MarshallingConfiguration;
21  import org.jboss.netty.channel.ChannelHandlerContext;
22  
23  /**
24   * {@link UnmarshallerProvider} implementation which use a {@link ThreadLocal} to store references
25   * to {@link Marshaller} instances. This may give you some performance boost if you need to marshall
26   * many small {@link Object}'s and your actual Thread count is not to big
27   *
28   *
29   *
30   *
31   */
32  public class ThreadLocalMarshallerProvider implements MarshallerProvider {
33      private final ThreadLocal<Marshaller> marshallers = new ThreadLocal<Marshaller>();
34  
35      private final MarshallerFactory factory;
36      private final MarshallingConfiguration config;
37  
38      /**
39       * Create a new instance of the {@link ThreadLocalMarshallerProvider}
40       *
41       * @param factory   the {@link MarshallerFactory} to use to create {@link Marshaller}'s if needed
42       * @param config    the {@link MarshallingConfiguration} to use
43       */
44      public ThreadLocalMarshallerProvider(MarshallerFactory factory, MarshallingConfiguration config) {
45          this.factory = factory;
46          this.config = config;
47      }
48  
49      public Marshaller getMarshaller(ChannelHandlerContext ctx) throws Exception {
50          Marshaller marshaller = marshallers.get();
51          if (marshaller == null) {
52              marshaller = factory.createMarshaller(config);
53              marshallers.set(marshaller);
54          }
55          return marshaller;
56      }
57  }