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package org.apache.qpid.server.queue;
import org.apache.qpid.AMQException;
import org.apache.qpid.server.store.StoreContext;
import org.apache.qpid.server.subscription.Subscription;
/*
*
* 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.
*
*/
public interface QueueEntry extends Comparable<QueueEntry>
{
public static enum State
{
AVAILABLE,
ACQUIRED,
EXPIRED,
DEQUEUED
}
public static interface StateChangeListener
{
public void stateChanged(QueueEntry entry, State oldSate, State newState);
}
public abstract class EntryState
{
private EntryState()
{
}
public abstract State getState();
}
public final class AvailableState extends EntryState
{
public State getState()
{
return State.AVAILABLE;
}
}
public final class DeletedState extends EntryState
{
public State getState()
{
return State.DEQUEUED;
}
}
public final class ExpiredState extends EntryState
{
public State getState()
{
return State.EXPIRED;
}
}
public final class NonSubscriptionAcquiredState extends EntryState
{
public State getState()
{
return State.ACQUIRED;
}
}
public final class SubscriptionAcquiredState extends EntryState
{
private final Subscription _subscription;
public SubscriptionAcquiredState(Subscription subscription)
{
_subscription = subscription;
}
public State getState()
{
return State.ACQUIRED;
}
public Subscription getSubscription()
{
return _subscription;
}
}
final static EntryState AVAILABLE_STATE = new AvailableState();
final static EntryState DELETED_STATE = new DeletedState();
final static EntryState EXPIRED_STATE = new ExpiredState();
final static EntryState NON_SUBSCRIPTION_ACQUIRED_STATE = new NonSubscriptionAcquiredState();
AMQQueue getQueue();
AMQMessage getMessage();
long getSize();
boolean getDeliveredToConsumer();
boolean expired() throws AMQException;
boolean isAcquired();
boolean acquire();
boolean acquire(Subscription sub);
boolean delete();
boolean isDeleted();
boolean acquiredBySubscription();
void setDeliveredToSubscription();
void release();
String debugIdentity();
boolean immediateAndNotDelivered();
void setRedelivered(boolean b);
Subscription getDeliveredSubscription();
void reject();
void reject(Subscription subscription);
boolean isRejectedBy(Subscription subscription);
void requeue(StoreContext storeContext) throws AMQException;
void dequeue(final StoreContext storeContext) throws FailedDequeueException;
void dispose(final StoreContext storeContext) throws MessageCleanupException;
void restoreCredit();
void discard(StoreContext storeContext) throws AMQException;
boolean isQueueDeleted();
void addStateChangeListener(StateChangeListener listener);
boolean removeStateChangeListener(StateChangeListener listener);
}
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