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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.qpid.server.queue;
import org.apache.qpid.AMQException;
import org.apache.qpid.server.filter.Filterable;
import org.apache.qpid.server.message.MessageInstance;
import org.apache.qpid.server.subscription.Subscription;
import org.apache.qpid.server.txn.ServerTransaction;
public interface QueueEntry extends MessageInstance, Comparable<QueueEntry>
{
public static enum State
{
AVAILABLE,
ACQUIRED,
EXPIRED,
DEQUEUED,
DELETED;
}
public static interface StateChangeListener
{
public void stateChanged(QueueEntry entry, State oldSate, State newState);
}
public abstract class EntryState
{
private EntryState()
{
}
public abstract State getState();
/**
* Returns true if state is either DEQUEUED or DELETED.
*
* @return true if state is either DEQUEUED or DELETED.
*/
public boolean isDispensed()
{
State currentState = getState();
return currentState == State.DEQUEUED || currentState == State.DELETED;
}
}
public final class AvailableState extends EntryState
{
public State getState()
{
return State.AVAILABLE;
}
public String toString()
{
return getState().name();
}
}
public final class DequeuedState extends EntryState
{
public State getState()
{
return State.DEQUEUED;
}
public String toString()
{
return getState().name();
}
}
public final class DeletedState extends EntryState
{
public State getState()
{
return State.DELETED;
}
public String toString()
{
return getState().name();
}
}
public final class ExpiredState extends EntryState
{
public State getState()
{
return State.EXPIRED;
}
public String toString()
{
return getState().name();
}
}
public final class NonSubscriptionAcquiredState extends EntryState
{
public State getState()
{
return State.ACQUIRED;
}
public String toString()
{
return getState().name();
}
}
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;
}
public String toString()
{
return "{" + getState().name() + " : " + _subscription +"}";
}
}
final static EntryState AVAILABLE_STATE = new AvailableState();
final static EntryState DELETED_STATE = new DeletedState();
final static EntryState DEQUEUED_STATE = new DequeuedState();
final static EntryState NON_SUBSCRIPTION_ACQUIRED_STATE = new NonSubscriptionAcquiredState();
AMQQueue getQueue();
long getSize();
boolean getDeliveredToConsumer();
boolean expired() throws AMQException;
boolean acquire(Subscription sub);
boolean acquiredBySubscription();
boolean isAcquiredBy(Subscription subscription);
void setRedelivered();
boolean isRedelivered();
Subscription getDeliveredSubscription();
void reject();
boolean isRejectedBy(long subscriptionId);
int routeToAlternate(final BaseQueue.PostEnqueueAction action, ServerTransaction txn);
boolean isQueueDeleted();
QueueEntry getNextNode();
QueueEntry getNextValidEntry();
void addStateChangeListener(StateChangeListener listener);
boolean removeStateChangeListener(StateChangeListener listener);
/**
* Number of times this queue entry has been delivered.
*
* @return delivery count
*/
int getDeliveryCount();
void incrementDeliveryCount();
void decrementDeliveryCount();
Filterable asFilterable();
}
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