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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.Channel;
    22  import org.jboss.netty.channel.ChannelHandler;
    23  import org.jboss.netty.channel.ChannelHandlerContext;
    24
    25  /**
    26   * {@link UnmarshallerProvider} which store a reference to the {@link Unmarshaller} in the
    27   * {@link ChannelHandlerContext} via the {@link ChannelHandlerContext#setAttachment(Object)}
    28   * method. So the same {@link Unmarshaller} will be used during the life-time of a {@link Channel}
    29   * for the {@link ChannelHandler}'s {@link ChannelHandlerContext}.
    30   *
    31   *
    32   */
    33  public class ContextBoundUnmarshallerProvider extends DefaultUnmarshallerProvider {
    34
    35      public ContextBoundUnmarshallerProvider(MarshallerFactory factory, MarshallingConfiguration config) {
    36          super(factory, config);
    37      }
    38
    39      @Override
    40      public Unmarshaller getUnmarshaller(ChannelHandlerContext ctx) throws Exception {
    41          Unmarshaller unmarshaller = (Unmarshaller) ctx.getAttachment();
    42          if (unmarshaller == null) {
    43              unmarshaller = super.getUnmarshaller(ctx);
    44              ctx.setAttachment(unmarshaller);
    45          }
    46          return unmarshaller;
    47      }
    48
    49  }