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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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 org.jboss.netty.handler.codec.marshalling;
  
  import org.jboss.marshalling.MarshallerFactory;
  import org.jboss.marshalling.MarshallingConfiguration;
  import org.jboss.marshalling.Unmarshaller;
  import org.jboss.netty.channel.ChannelHandlerContext;
  
  /**
   * {@link UnmarshallerProvider} implementation which use a {@link ThreadLocal} to store references
   * to {@link Unmarshaller} instances. This may give you some performance boost if you need to unmarshall
   * many small {@link Object}'s.
   *
   *
   */
  public class ThreadLocalUnmarshallerProvider implements UnmarshallerProvider {
      private final ThreadLocal<Unmarshaller> unmarshallers = new ThreadLocal<Unmarshaller>();
  
      private final MarshallerFactory factory;
      private final MarshallingConfiguration config;
  
      /**
       * Create a new instance of the {@link ThreadLocalUnmarshallerProvider}
       *
       * @param factory   the {@link MarshallerFactory} to use to create {@link Unmarshaller}'s if needed
       * @param config    the {@link MarshallingConfiguration} to use
       */
      public ThreadLocalUnmarshallerProvider(MarshallerFactory factory, MarshallingConfiguration config) {
          this.factory = factory;
          this.config = config;
      }
  
      public Unmarshaller getUnmarshaller(ChannelHandlerContext ctx) throws Exception {
          Unmarshaller unmarshaller = unmarshallers.get();
          if (unmarshaller == null) {
              unmarshaller = factory.createUnmarshaller(config);
              unmarshallers.set(unmarshaller);
          }
          return unmarshaller;
      }
  
  }