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    1   /**
    2    * Licensed to the Apache Software Foundation (ASF) under one or more
    3    * contributor license agreements.  See the NOTICE file distributed with
    4    * this work for additional information regarding copyright ownership.
    5    * The ASF licenses this file to You under the Apache License, Version 2.0
    6    * (the "License"); you may not use this file except in compliance with
    7    * the License.  You may obtain a copy of the License at
    8    *
    9    *      http://www.apache.org/licenses/LICENSE-2.0
   10    *
   11    * Unless required by applicable law or agreed to in writing, software
   12    * distributed under the License is distributed on an "AS IS" BASIS,
   13    * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   14    * See the License for the specific language governing permissions and
   15    * limitations under the License.
   16    */
   17   package org.apache.activemq.broker.region;
   18   
   19   /**
   20    * Queue specific MessageReference.
   21    * 
   22    * @author fateev@amazon.com
   23    * @version $Revision: 628667 $
   24    */
   25   public interface QueueMessageReference extends MessageReference {
   26   
   27       QueueMessageReference NULL_MESSAGE = new NullMessageReference();
   28   
   29       boolean isAcked();
   30       
   31       void setAcked(boolean b);
   32       
   33       void drop();
   34    
   35       boolean isDropped();
   36           
   37       boolean lock(LockOwner subscription);
   38       
   39       boolean unlock();
   40       
   41       LockOwner getLockOwner();
   42   }

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