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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 java.util.List;
import java.util.concurrent.Executor;
import org.apache.qpid.AMQException;
import org.apache.qpid.framing.AMQShortString;
import org.apache.qpid.server.AMQChannel;
import org.apache.qpid.server.protocol.AMQProtocolSession;
import org.apache.qpid.server.store.StoreContext;
interface DeliveryManager
{
/**
* Determines whether there are queued messages. Sets _queueing to false if
* there are no queued messages. This needs to be atomic.
*
* @return true if there are queued messages
*/
boolean hasQueuedMessages();
/**
* This method should not be used to determin if there are messages in the queue.
*
* @return int The number of messages in the queue
* @use hasQueuedMessages() for all controls relating to having messages on the queue.
*/
int getQueueMessageCount();
/**
* Requests that the delivery manager start processing the queue asynchronously
* if there is work that can be done (i.e. there are messages queued up and
* subscribers that can receive them.
* <p/>
* This should be called when subscribers are added, but only after the consume-ok
* message has been returned as message delivery may start immediately. It should also
* be called after unsuspending a client.
* <p/>
*
* @param executor the executor on which the delivery should take place
*/
void processAsync(Executor executor);
/**
* Handles message delivery. The delivery manager is always in one of two modes;
* it is either queueing messages for asynchronous delivery or delivering
* directly.
*
* @param name the name of the entity on whose behalf we are delivering the message
* @param msg the message to deliver
* @throws org.apache.qpid.server.queue.FailedDequeueException if the message could not be dequeued
*/
void deliver(StoreContext storeContext, AMQShortString name, AMQMessage msg) throws FailedDequeueException, AMQException;
void removeAMessageFromTop(StoreContext storeContext) throws AMQException;
long clearAllMessages(StoreContext storeContext) throws AMQException;
void startMovingMessages();
void enqueueMovedMessages(StoreContext context, List<AMQMessage> messageList);
void stopMovingMessages();
void removeMovedMessages(List<AMQMessage> messageListToRemove);
List<AMQMessage> getMessages();
void populatePreDeliveryQueue(Subscription subscription);
boolean performGet(AMQProtocolSession session, AMQChannel channel, boolean acks) throws AMQException;
long getTotalMessageSize();
long getOldestMessageArrival();
}
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