/// <summary>
///
/// </summary>
/// <param name="event"></param>
/// <param name="expires">消息过期时间</param>
public static void WithNoRetry(this MessageCarrier @event)
{
@event.Headers["x-first-death-queue"] = $"{@event.RouteKey}@Failed"; //死信队列名称
@event.Headers.Remove("x-message-ttl");
@event.Headers["x-dead-letter-exchange"] = @event.Headers["x-exchange"]; //过期消息转向路由
@event.Headers["x-dead-letter-routing-key"] = @event.RouteKey; //过期消息转向路由相匹配routingkey
}
/// <summary>
/// 设置延时策略
/// </summary>
/// <param name="event"></param>
/// <param name="TTL">延时时间（秒）</param>
/// <returns></returns>
public static void WithWait(this MessageCarrier @event, int TTL)
{
@event.Headers["x-first-death-queue"] = $"{@event.RouteKey}@Delay#{TTL}"; //死信队列名称
@event.Headers["x-message-ttl"] = TTL * 1000; //当一个消息被推送在该队列的时候 可以存在的时间 单位为ms，应小于队列过期时间
@event.Headers["x-dead-letter-exchange"] = @event.Headers["x-exchange"]; //过期消息转向路由
@event.Headers["x-dead-letter-routing-key"] = @event.RouteKey; //过期消息转向路由相匹配routingkey
}
/// <summary>
/// 重试，（有等待时间，有重试次数限制）
/// </summary>
/// <param name="response"></param>
/// <returns></returns>
public static MessageCarrier WaitAndRetry(this MessageResponse response, Func <int, int> retryAttempt, int maxRetries)
{
var @event = MessageCarrier.Clone(response);
var numberOfRetries = response.GetNumberOfRetries();
var TTL = retryAttempt(numberOfRetries);
//当前重试次数小于最大重试次数
if (numberOfRetries < maxRetries)
{
@event.WithWait(TTL);
@event.WithRetry(maxRetries, ++numberOfRetries);
}
else
{
@event.WithNoRetry();
}
return(@event);
}
/// <summary>
/// 设置重试策略
/// </summary>
/// <param name="event"></param>
/// <param name="MaxRetries">最大重试次数</param>
/// <param name="NumberOfRetries">当前重试次数</param>
/// <returns></returns>
public static void WithRetry(this MessageCarrier @event, int MaxRetries, int NumberOfRetries)
{
@event.Headers["x-message-max-retries"] = MaxRetries;
@event.Headers["x-message-retries"] = NumberOfRetries;
}
