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The ActiveMQ Message Broker implementation

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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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
 *
 *      http://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 org.apache.activemq.broker.region;

/**
 * Queue specific MessageReference.
 *
 * @author [email protected]
 *
 */
public interface QueueMessageReference extends MessageReference {

    QueueMessageReference NULL_MESSAGE = new NullMessageReference();

    boolean isAcked();

    void setAcked(boolean b);

    void drop();

    boolean dropIfLive();

    @Override
    boolean isDropped();

    boolean lock(LockOwner subscription);

    boolean unlock();

    LockOwner getLockOwner();
}