broker-core/src/main/java/org/apache/qpid/server/queue/QueueEntry.java

/*
*
* 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
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package org.apache.qpid.server.queue;

import org.apache.qpid.server.message.MessageInstance;
import org.apache.qpid.server.message.MessageReference;
import org.apache.qpid.server.model.Queue;

public interface QueueEntry extends MessageInstance, Comparable<QueueEntry>
{

    Queue<?> getQueue();

    long getSize();

    boolean acquireOrSteal(final Runnable delayedAcquisitionTask);

    QueueConsumer getDeliveredConsumer();

    boolean isQueueDeleted();

    QueueEntry getNextNode();

    QueueEntry getNextValidEntry();

    void setExpiration(long calculatedExpiration);

    MessageReference newMessageReference();

    boolean checkHeld(final long evaluationTime);
}