/// <summary>
/// 异步生成断路器包装策略
/// </summary>
/// <typeparam name="TResult">结果类型</typeparam>
/// <typeparam name="TException">异常类型</typeparam>
/// <param name="options">断路器包装策略选项配置</param>
/// <param name="log">日志</param>
/// <returns>策略任务</returns>
public static IAsyncPolicy <TResult> BuilderBreakerWrapPollicyAsync <TResult, TException>(Action <BreakerWrapPolicyOptions <TResult> > options = null, ILogable log = null)
where TException : Exception
{
var config = new BreakerWrapPolicyOptions <TResult>();
if (options != null)
{
options(config);
}
var policys = new List <IAsyncPolicy <TResult> >();
// 降级
var fallback = Policy <TResult> .Handle <TException>().FallbackAsync(token =>
{
return(Task <TResult> .Run(() =>
{
if (config.GetResult == null)
{
return config.Result;
}
else
{
return config.GetResult();
}
}));
});
policys.Add(fallback);
// 断路
if (config.Breaker != null)
{
var breaker = Policy <TResult> .Handle <TException>()
.CircuitBreakerAsync(
handledEventsAllowedBeforeBreaking: config.Breaker.HandledEventsAllowedBeforeBreaking,
durationOfBreak: TimeSpan.FromSeconds(config.Breaker.DurationOfBreak),
onBreak: (ex, state, ts, context) =>
{
log.AvailableLog().WranAsync($"(onBreak)进入断路器,状态:{state},timespan:{ts}", ex.Exception, thisName, tags: config.Id);
},
onReset: (context) =>
{
log.AvailableLog().InfoAsync(msg: "(onReset)关闭断路器", source: thisName, tags: config.Id);
},
onHalfOpen: () =>
{
log.AvailableLog().InfoAsync(msg: "(onHalfOpen)半打开断路器", source: thisName, tags: config.Id);
});
policys.Add(breaker);
}
// 重试
if (config.RetryNumber != 0)
{
var retry = Policy <TResult> .Handle <TException>()
.RetryAsync(config.RetryNumber, (ex, num) =>
{
log.AvailableLog().WranAsync(msg: $"(retrt)重试第{num}次", ex.Exception, source: thisName, tags: config.Id);
});
policys.Add(retry);
}
// 超时
if (config.Timeout != 0)
{
var timeout = Policy.TimeoutAsync <TResult>(config.Timeout);
policys.Add(timeout);
}
return(Policy.WrapAsync <TResult>(policys.ToArray()));
}
