/// <summary>
/// The Publish.
/// </summary>
/// <typeparam name="TObject">.</typeparam>
/// <param name="produceConfig">The produceConfig<see cref="Func{MqSettings}"/>.</param>
/// <param name="jsonBody">The jsonBody<see cref="Func{string}"/>.</param>
/// <returns>The <see cref="bool"/>.</returns>
public bool Publish <TObject>(Func <MqSettings> produceConfig, Func <string> jsonBody)
{
MqSettings config = produceConfig();
if (string.IsNullOrWhiteSpace(config.QueueName))
{
throw new Exception($"{nameof(config.QueueName)}不可为空");
}
try
{
if (_channel == null || _channel.IsClosed)
{
_channel = _connection.CreateModel();
//设置交换器及类型
_channel.ExchangeDeclare(
config.ExChangeName,
config.ExChangeType,
config.Durable,
config.AutoDelete,
config.Arguments);
//声明队列
_channel.QueueDeclare(
queue: config.QueueName, //队列名称
durable: config.Durable, //是否持久化 true
exclusive: config.Exclusive, //是否排它性 false
autoDelete: config.AutoDelete, //是否自动删除 false
arguments: config.Arguments);
//绑定消息队列
_channel.QueueBind(
queue: config.QueueName, //队列
exchange: config.ExChangeName, //交换器
routingKey: config.RoutingKey, //routingkey
arguments: config.Arguments);
}
//持久化队列
var properties = _channel.CreateBasicProperties();
properties.Persistent = true;
//转换消息数据
if (string.IsNullOrWhiteSpace(jsonBody()))
{
throw new Exception($"委托参数{nameof(jsonBody)}不可为空。");
}
var body = Encoding.UTF8.GetBytes(jsonBody());
//发送消息
_channel.BasicPublish(
exchange: config.ExChangeName,
routingKey: config.RoutingKey,
mandatory: true,//如果exchange根据自身类型和消息routingKey无法找到一个合适的queue存储消息，那么broker会调用basic.return方法将消息返还给生产者;false:将直接丢弃
basicProperties: properties,
body: body);
return(true);
}
catch (Exception ex)
{
_logger.LogError(exception: ex, $"{nameof(MqService)}.Publish 出现异常");
return(false);
}
}
/// <summary>
/// The Subscribe.
/// </summary>
/// <param name="settings">The settings<see cref="Func{MqSettings}"/>.</param>
/// <param name="func">The func<see cref="Func{string, bool}"/>.</param>
public void Subscribe(Func <MqSettings> settings, Func <string, bool> func)
{
MqSettings config = settings();
if (string.IsNullOrWhiteSpace(config.QueueName))
{
throw new Exception($"{nameof(config.QueueName)}不可为空");
}
try
{
Task.Run(() =>
{
if (_channel == null || _channel.IsClosed)
{
_channel = _connection.CreateModel();
//设置交换器及类型
_channel.ExchangeDeclare(
config.ExChangeName,
config.ExChangeType,
config.Durable,
config.AutoDelete,
config.Arguments);
//声明队列
_channel.QueueDeclare(
queue: config.QueueName, //队列名称
durable: config.Durable, //是否持久化 true
exclusive: config.Exclusive, //是否排它性 false
autoDelete: config.AutoDelete, //是否自动删除 false
arguments: config.Arguments);
}
//此处临时如此处理，后面有特殊需求在做扩展，这里是一次从队列拿一条
_channel.BasicQos(prefetchSize: 0, prefetchCount: 1, global: false);//告诉broker同一时间只处理一个消息
var consumer = new EventingBasicConsumer(_channel);
consumer.Received += (currentConsumer, ea) =>
{
try
{
lock (_object)
{
var body = ea.Body;
var message = Encoding.UTF8.GetString(body);
_logger.LogInformation($"接收到{config.QueueName}消息: {message} )");
bool blnResult = func(message);
if (blnResult)
{
_logger.LogInformation($"MQConsumerService.Subscribor 调用委托执行完成");
if (!config.AutoAck)
{
_channel.BasicAck(ea.DeliveryTag, false); //手动应答
IBasicProperties props = ea.BasicProperties; //传来的属性
_channel.BasicPublish(ea.Exchange, ea.RoutingKey, props, ea.Body);
}
else
{
_channel.BasicAck(ea.DeliveryTag, true);
}
}
else
{
_logger.LogWarning($"消费端回调函执行结果为：{blnResult}");
}
}
}
catch (Exception ex)
{
_logger.LogError(ex, "MQConsumerService.Subscribor 执行失败");
if (!config.AutoAck)
{
/*
* 此种方式存在缺陷，方便其他人学习，所以我写在这，会导致一个很严重的结果就是消息在消费失败之后回退队列时，会一直处于队列末尾，
* 这样会循环往复的被处理，如果一直失败，其他消息也失败，长期会导致消息堆积，大量堆积。
*/
//channel.BasicReject(ea.DeliveryTag, command.Requeue);
//换成以下方式（将错误或消费失败消息推送到队列尾部）
_channel.BasicAck(ea.DeliveryTag, false); //手动应答
IBasicProperties props = ea.BasicProperties; //传来的属性
_channel.BasicPublish(ea.Exchange, ea.RoutingKey, props, ea.Body);
_logger.LogError(ex, "MQConsumerService.Subscribor.catch 已将消息重新推到队列（头部） ");
}
}
};
_channel.BasicConsume(queue: config.QueueName,
autoAck: config.AutoAck,
consumer: consumer);
_logger.LogInformation($"StartConsumer Successed");
Thread.Sleep(Timeout.Infinite);
});
}
catch (Exception ex)
{
_logger.LogError(exception: ex, $"{nameof(MqService)}.Consumer 出现异常");
}
}
