private AsyncPolicy <IServiceResult> GetPolicy(string route, Type returnValueType)
{
return(Policies.GetOrAdd(route, key =>
{
var service = ServiceFactory.Get(route);
var serviceCircuitBreakerOptions = service.ServiceCircuitBreakerOptions;
var circuitBreakerEvent = ServiceProvider.GetService <ICircuitBreakerEvent>();
AsyncPolicy <IServiceResult> policy = Policy <IServiceResult> .Handle <Exception>().FallbackAsync <IServiceResult>(
async ct =>
{
//TODO 如果多次降级，根据路由排除此node
if (circuitBreakerEvent != null)
{
await circuitBreakerEvent.OnFallback(route, service.ClientMethodInfo);
}
if (returnValueType == null)
{
return new ServiceResult(null);
}
if (service.ServiceCircuitBreakerOptions.HasInjection)
{
return new ServiceResult(await ScriptInjection.Run(route));
}
return new ServiceResult(returnValueType.IsValueType ? Activator.CreateInstance(returnValueType) : default);
});
private AsyncPolicy <object> GetPolicy(string route, Type returnValueType)
{
return(Policies.GetOrAdd(route, (key) =>
{
var service = ServiceFactory.Get(route);
var serviceCircuitBreakerOptions = service.ServiceCircuitBreakerOptions;
var circuitBreakerEvent = ServiceProvider.GetService <ICircuitBreakerEvent>();
AsyncPolicy <object> policy = Policy <object> .Handle <Exception>().FallbackAsync(
async ct =>
{
if (circuitBreakerEvent != null)
{
await circuitBreakerEvent.OnFallback(route, service.MethodInfo);
}
if (returnValueType == null)
{
return null;
}
if (service.ServiceCircuitBreakerOptions.HasInjection)
{
return await ScriptInjection.Run(route);
}
return returnValueType.IsValueType ? Activator.CreateInstance(returnValueType) : null;
});
if (serviceCircuitBreakerOptions.ExceptionsAllowedBeforeBreaking > 0)
{
policy = policy.WrapAsync(Policy.Handle <Exception>().CircuitBreakerAsync(serviceCircuitBreakerOptions.ExceptionsAllowedBeforeBreaking, serviceCircuitBreakerOptions.DurationOfBreak,
async(ex, state, ts, ctx) =>
{
if (circuitBreakerEvent != null)
{
await circuitBreakerEvent.OnBreak(route, service.MethodInfo, ex, ts);
}
},
async ctx =>
{
if (circuitBreakerEvent != null)
{
await circuitBreakerEvent.OnRest(route, service.MethodInfo);
}
},
async() =>
{
if (circuitBreakerEvent != null)
{
await circuitBreakerEvent.OnHalfOpen(route, service.MethodInfo);
}
}));
}
if (serviceCircuitBreakerOptions.Retry > 0)
{
policy = policy.WrapAsync(Policy.Handle <Exception>().RetryAsync(serviceCircuitBreakerOptions.Retry,
async(ex, times) =>
{
if (circuitBreakerEvent != null)
{
await circuitBreakerEvent.OnRetry(route, service.MethodInfo, ex, times);
}
}));
}
if (serviceCircuitBreakerOptions.Timeout.Ticks > 0)
{
policy = policy.WrapAsync(Policy.TimeoutAsync(serviceCircuitBreakerOptions.Timeout, TimeoutStrategy.Pessimistic,
async(ctx, ts, task, ex) =>
{
if (circuitBreakerEvent != null)
{
await circuitBreakerEvent.OnTimeOut(route, service.MethodInfo, ex);
}
}));
}
return policy;
}));
}
