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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:
    *
    *   https://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 io.netty.handler.codec.marshalling;
  
  import io.netty.channel.ChannelHandlerContext;
  
  import io.netty.util.concurrent.FastThreadLocal;
  import org.jboss.marshalling.Marshaller;
  import org.jboss.marshalling.MarshallerFactory;
  import org.jboss.marshalling.MarshallingConfiguration;
  
  /**
   * {@link UnmarshallerProvider} implementation which use a {@link ThreadLocal} to store references
   * to {@link Marshaller} instances. This may give you some performance boost if you need to marshall
   * many small {@link Object}'s and your actual Thread count is not to big
   */
  public class ThreadLocalMarshallerProvider implements MarshallerProvider {
      private final FastThreadLocal<Marshaller> marshallers = new FastThreadLocal<Marshaller>();
  
      private final MarshallerFactory factory;
      private final MarshallingConfiguration config;
  
      /**
       * Create a new instance of the {@link ThreadLocalMarshallerProvider}
       *
       * @param factory   the {@link MarshallerFactory} to use to create {@link Marshaller}'s if needed
       * @param config    the {@link MarshallingConfiguration} to use
       */
      public ThreadLocalMarshallerProvider(MarshallerFactory factory, MarshallingConfiguration config) {
          this.factory = factory;
          this.config = config;
      }
  
      @Override
      public Marshaller getMarshaller(ChannelHandlerContext ctx) throws Exception {
          Marshaller marshaller = marshallers.get();
          if (marshaller == null) {
              marshaller = factory.createMarshaller(config);
              marshallers.set(marshaller);
          }
          return marshaller;
      }
  }