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/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed 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 java.util.concurrent.Executor;
import java.util.List;
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(String name, AMQMessage msg) throws FailedDequeueException;
void removeAMessageFromTop() throws AMQException;
void clearAllMessages() throws AMQException;
List<AMQMessage> getMessages();
}
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