出处：https://www.cnblogs.com/hanfan/p/9842301.html
网上很多人已经总结的很好了，比如今天看到的这个。https://www.cnblogs.com/LipeiNet/p/9877189.html
我就不总结了，贴点代码。
RabbitMQConnect.cs
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using System;
using System.IO;
using System.Net.Sockets;
using Polly;
using Polly.Retry;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using RabbitMQ.Client.Exceptions;
namespace Common.Tool.RabbitMQ
{ public class RabbitMQConnect
{
static string host = "127.0.0.1";
static string UserName = "H";
static string password = "H";
public readonly static IConnectionFactory _connectionFactory;
IConnection _connection;
object sync_root = new object();
bool _disposed;
static RabbitMQConnect()
{
//if (host == "localhost")
//{
// _connectionFactory = new ConnectionFactory() { HostName = host };
//}
//else
{
_connectionFactory = new ConnectionFactory() { HostName = host, UserName = UserName, Password = password };
}
}
public bool IsConnected => this._connection != null && this._connection.IsOpen && this._disposed;
public IModel CreateModel()
{
if (!this.IsConnected)
{
this.TryConnect();
}
return this._connection.CreateModel();
}
public bool TryConnect()
{
lock (this.sync_root)
{
RetryPolicy policy = RetryPolicy.Handle<SocketException>()//如果我们想指定处理多个异常类型通过OR即可
.Or<BrokerUnreachableException>()//ConnectionFactory.CreateConnection期间无法打开连接时抛出异常
.WaitAndRetry(5, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)), (ex, time) =>
{
});// 重试次数，提供等待特定重试尝试的持续时间的函数，每次重试时调用的操作。
policy.Execute(() =>
{
this._connection = _connectionFactory.CreateConnection();
});
if (this.IsConnected)
{
//当连接被破坏时引发。如果在添加事件处理程序时连接已经被销毁对于此事件，事件处理程序将立即被触发。
this._connection.ConnectionShutdown += this.OnConnectionShutdown;
//在连接调用的回调中发生异常时发出信号。当ConnectionShutdown处理程序抛出异常时，此事件将发出信号。如果将来有更多的事件出现在RabbitMQ.Client.IConnection上，那么这个事件当这些事件处理程序中的一个抛出异常时，它们将被标记。
this._connection.CallbackException += this.OnCallbackException;
this._connection.ConnectionBlocked += this.OnConnectionBlocked;
//LogHelperNLog.Info($"RabbitMQ persistent connection acquired a connection {_connection.Endpoint.HostName} and is subscribed to failure events");
return true;
}
else
{
// LogHelperNLog.Info("FATAL ERROR: RabbitMQ connections could not be created and opened");
return false;
}
}
}
void OnConnectionShutdown(object sender, ShutdownEventArgs reason)
{
if (this._disposed) return;
//RabbitMQ连接正在关闭。 尝试重新连接...
//LogHelperNLog.Info("A RabbitMQ connection is on shutdown. Trying to re-connect...");
this.TryConnect();
}
/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void OnCallbackException(object sender, CallbackExceptionEventArgs e)
{
if (this._disposed) return;
// LogHelperNLog.Info("A RabbitMQ connection throw exception. Trying to re-connect...");
this.TryConnect();
}
private void OnConnectionBlocked(object sender, ConnectionBlockedEventArgs e)
{
if (this._disposed) return;
// LogHelperNLog.Info("A RabbitMQ connection is shutdown. Trying to re-connect...");
this.TryConnect();
}
public void Dispose()
{
if (this._disposed) return;
this._disposed = true;
try
{
this._connection.Dispose();
}
catch (IOException ex)
{
//_logger.LogCritical(ex.ToString());
// LogHelperNLog.Error(ex);
}
}
}
} |
RabbitMQSend.cs
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using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using System.Text;
namespace Common.Tool.RabbitMQ
{ public class RabbitMQSend
{
/// <summary>
/// Newtonsoft.Json利用IsoDateTimeConverter处理日期类型
/// </summary>
static IsoDateTimeConverter dtConverter = new IsoDateTimeConverter { DateTimeFormat = "yyyy-MM-dd HH:mm:ss" };
static RabbitMQConnect connection=null;
static RabbitMQSend()
{
connection = new RabbitMQConnect();
}
/// <summary>
/// 添加信息到队列
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="item">信息</param>
/// <param name="queueName">队列名</param>
public static void PushMsgToMq<T>(T item, string queueName)
{
string msg = JsonConvert.SerializeObject(item, dtConverter);
using (global::RabbitMQ.Client.IModel channel = connection.CreateModel())
{
channel.QueueDeclare(queue: queueName,
durable: true,
exclusive: false,
autoDelete: false,
arguments: null);
//Construct a completely empty content header for use with the Basic content class.
//构造一个完全空的内容标头，以便与Basic内容类一起使用。
global::RabbitMQ.Client.IBasicProperties properties = channel.CreateBasicProperties();
properties.Persistent = true;
byte[] body = Encoding.UTF8.GetBytes(msg);
channel.BasicPublish(exchange: "",
routingKey: queueName,
basicProperties: properties,
body: body);
}
}
}
} |
RabbitMQReceive.cs
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using Newtonsoft.Json;
using RabbitMQ.Client;
using RabbitMQ.Client.Events;
using System;
using System.Text;
namespace Common.Tool.RabbitMQ
{ public class RabbitMQReceive : IDisposable
{
IConnection connection = null;
IModel channel = null;
public void BindReceiveMqMsg<T>(Func<T, bool> func, Action<string> log, string queueName)
{
this.connection = RabbitMQConnect._connectionFactory.CreateConnection();//创建与指定端点的连接。
this.channel = this.connection.CreateModel(); //创建并返回新的频道，会话和模型。
this.channel.QueueDeclare(queue: queueName,//队列名称
durable: true,//是否持久化, 队列的声明默认是存放到内存中的，如果rabbitmq重启会丢失，如果想重启之后还存在就要使队列持久化，保存到Erlang自带的Mnesia数据库中，当rabbitmq重启之后会读取该数据库
exclusive: false,//是否排外的，有两个作用，一：当连接关闭时connection.close()该队列是否会自动删除；二：该队列是否是私有的private，如果不是排外的，可以使用两个消费者都访问同一个队列，没有任何问题，如果是排外的，会对当前队列加锁，其他通道channel是不能访问的，如果强制访问会报异常：com.rabbitmq.client.ShutdownSignalException: channel error; protocol method: #method<channel.close>(reply-code=405, reply-text=RESOURCE_LOCKED - cannot obtain exclusive access to locked queue 'queue_name' in vhost '/', class-id=50, method-id=20)一般等于true的话用于一个队列只能有一个消费者来消费的场景
autoDelete: false,//是否自动删除，当最后一个消费者断开连接之后队列是否自动被删除，可以通过RabbitMQ Management，查看某个队列的消费者数量，当consumers = 0时队列就会自动删除
arguments: null);//队列中的消息什么时候会自动被删除？
this.channel.BasicQos(prefetchSize: 0, prefetchCount: 1, global: false);//（Spec方法）配置Basic内容类的QoS参数。
//第一个参数是可接收消息的大小的 0不受限制
//第二个参数是处理消息最大的数量 1 那如果接收一个消息，但是没有应答，则客户端不会收到下一个消息，消息只会在队列中阻塞
//第三个参数则设置了是不是针对整个Connection的，因为一个Connection可以有多个Channel，如果是false则说明只是针对于这个Channel的。
EventingBasicConsumer consumer = new EventingBasicConsumer(this.channel);//构造函数，它将Model属性设置为给定值。
consumer.Received += (model, bdea) =>
{
byte[] body = bdea.Body;
string message = Encoding.UTF8.GetString(body);
log?.Invoke(message);
T item = JsonConvert.DeserializeObject<T>(message);
bool result = func(item);
if (result)
{
//（Spec方法）确认一个或多个已传送的消息。
this.channel.BasicAck(deliveryTag: bdea.DeliveryTag, multiple: false);
}
};
this.channel.BasicConsume(queue: queueName, noAck: false, consumer: consumer); //The consumer is started with noAck = false(i.e.BasicAck is required), an empty consumer tag (i.e. the server creates and returns a fresh consumer tag), noLocal=false and exclusive=false.
}
public void Dispose()
{
if (this.channel != null)
{
this.channel.Close();
}
if (this.connection != null)
{
this.connection.Close();
}
}
}
} |