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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  }