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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.MarshallerFactory;
    19  import org.jboss.marshalling.MarshallingConfiguration;
    20  import org.jboss.marshalling.Unmarshaller;
    21  import org.jboss.netty.channel.ChannelHandlerContext;
    22
    23  /**
    24   * {@link UnmarshallerProvider} implementation which use a {@link ThreadLocal} to store references
    25   * to {@link Unmarshaller} instances. This may give you some performance boost if you need to unmarshall
    26   * many small {@link Object}'s.
    27   *
    28   *
    29   */
    30  public class ThreadLocalUnmarshallerProvider implements UnmarshallerProvider {
    31      private final ThreadLocal<Unmarshaller> unmarshallers = new ThreadLocal<Unmarshaller>();
    32
    33      private final MarshallerFactory factory;
    34      private final MarshallingConfiguration config;
    35
    36      /**
    37       * Create a new instance of the {@link ThreadLocalUnmarshallerProvider}
    38       *
    39       * @param factory   the {@link MarshallerFactory} to use to create {@link Unmarshaller}'s if needed
    40       * @param config    the {@link MarshallingConfiguration} to use
    41       */
    42      public ThreadLocalUnmarshallerProvider(MarshallerFactory factory, MarshallingConfiguration config) {
    43          this.factory = factory;
    44          this.config = config;
    45      }
    46
    47      public Unmarshaller getUnmarshaller(ChannelHandlerContext ctx) throws Exception {
    48          Unmarshaller unmarshaller = unmarshallers.get();
    49          if (unmarshaller == null) {
    50              unmarshaller = factory.createUnmarshaller(config);
    51              unmarshallers.set(unmarshaller);
    52          }
    53          return unmarshaller;
    54      }
    55
    56  }