/// <summary>
/// FallbackPolicy是多线程安全的和可重用的
/// </summary>
/// <param name="func">要执行的业务逻辑</param>
/// <param name="fallbackAction">业务逻辑执行失败后，执行的挽救代码</param>
/// <returns></returns>
public static PolicyResult <T> Fallback <T>(Func <T> func, Action fallbackAction = null)
{
FallbackPolicy policy = Policy.Handle <Exception>().Fallback(() =>
{
fallbackAction?.Invoke();
});
return(policy.ExecuteAndCapture(func));
}
//FallbackPolicy是多线程安全的和可重用的
/// <summary>
/// FallbackPolicy是多线程安全的和可重用的
/// </summary>
/// <param name="action">要执行的业务逻辑</param>
/// <param name="fallbackAction">业务逻辑执行失败后，执行的挽救代码</param>
/// <returns></returns>
public static PolicyResult Fallback(Action action, Action fallbackAction = null)
{
FallbackPolicy policy = Policy.Handle <Exception>().Fallback(() =>
{
fallbackAction?.Invoke();
});
return(policy.ExecuteAndCapture(action));
}
public void Should_call_fallbackAction_with_the_passed_context_when_execute_and_capture()
{
IDictionary <string, object> contextData = null;
Func <Context, CancellationToken, ResultPrimitive> fallbackAction = (ctx, ct) => { contextData = ctx; return(ResultPrimitive.Substitute); };
Action <DelegateResult <ResultPrimitive>, Context> onFallback = (ex, ctx) => { };
FallbackPolicy <ResultPrimitive> fallbackPolicy = Policy
.HandleResult(ResultPrimitive.Fault)
.Fallback(fallbackAction, onFallback);
fallbackPolicy.ExecuteAndCapture(() => { return(ResultPrimitive.Fault); },
new { key1 = "value1", key2 = "value2" }.AsDictionary())
.Result.Should().Be(ResultPrimitive.Substitute);
contextData.Should()
.ContainKeys("key1", "key2").And
.ContainValues("value1", "value2");
}
public void Should_call_fallbackAction_with_the_fault_when_execute_and_capture()
{
DelegateResult <ResultPrimitive> fallbackOutcome = null;
Func <DelegateResult <ResultPrimitive>, Context, CancellationToken, ResultPrimitive> fallbackAction =
(outcome, ctx, ct) => { fallbackOutcome = outcome; return(ResultPrimitive.Substitute); };
Action <DelegateResult <ResultPrimitive>, Context> onFallback = (ex, ctx) => { };
FallbackPolicy <ResultPrimitive> fallbackPolicy = Policy <ResultPrimitive>
.HandleResult(ResultPrimitive.Fault)
.Fallback(fallbackAction, onFallback);
var result = fallbackPolicy.ExecuteAndCapture(() => { return(ResultPrimitive.Fault); });
result.Should().NotBeNull();
result.Result.Should().Be(ResultPrimitive.Substitute);
fallbackOutcome.Should().NotBeNull();
fallbackOutcome.Exception.Should().BeNull();
fallbackOutcome.Result.Should().Be(ResultPrimitive.Fault);
}