| /* |
| * |
| * 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. |
| * |
| */ |
| using System; |
| |
| namespace Apache.Qpid.Messaging |
| { |
| /// <summary> |
| /// Describes an object that can be used to receive (consume) |
| /// messages from an AMQP queue. |
| /// </summary> |
| /// <remarks> |
| /// Consumers are created using either |
| /// <see cref="IChannel.CreateConsumer"/> or using |
| /// the builder pattern (preferred) with |
| /// <see cref="IChannel.CreateConsumerBuilder"/>. |
| /// |
| /// <para> |
| /// Consumers offer two different ways of receiving messages: |
| /// You can attach a delegate to the <see cref="OnMessage"/> |
| /// event and be notified when a message arrives, or you can |
| /// use the <see cref="Receive"/> and <see cref="ReceiveNoWait"/> |
| /// methods to control when you receive messages. Be aware that you can use |
| /// one or the other, but not both at the same time. |
| /// </para> |
| /// <para> |
| /// Regardless of which method you choose, the prefetch settings |
| /// specified when creating the channel will still control when messages |
| /// are actually received from the AMQP broker. Any messages that arrive |
| /// between the prefetch window will be queued by the channel |
| /// until they can be delivered to the consumer (either though the event |
| /// or until the consumer actively calls <see cref="Receive"/>). |
| /// </para> |
| /// </remarks> |
| public interface IMessageConsumer : IDisposable, ICloseable |
| { |
| /// <summary> |
| /// Fired when a message is received from the broker by the consumer |
| /// </summary> |
| MessageReceivedDelegate OnMessage { get; set; } |
| |
| /// <summary> |
| /// Wait infinitely for a message to be received from the broker |
| /// </summary> |
| /// <returns>The message received</returns> |
| IMessage Receive(); |
| |
| /// <summary> |
| /// Wait the specified time until a message is receive from the broker |
| /// </summary> |
| /// <param name="delay">Maximum number of milliseconds to wait for a message</param> |
| /// <returns>The message received, or null if the timeout expires</returns> |
| IMessage Receive(long delay); |
| |
| /// <summary> |
| /// Return a message if one is already available in the channel. |
| /// Does not wait for one to be received from the broker. |
| /// </summary> |
| /// <returns>The message, if it was available, otherwise null</returns> |
| IMessage ReceiveNoWait(); |
| } |
| } |