public void WaitAndRetry_WithAction()
{
TimeSpan slept = TimeSpan.Zero;
SystemUtil.SetSleep(span => slept += span);
int count = 0;
var policy = ActionPolicy
.Handle <TimeoutException>()
.WaitAndRetry(Range.Create(5, i => i.Seconds()), (ex, s) => count += 1);
// non-handled
Expect <ArgumentException>(() => policy.Do(RaiseArgument));
Assert.AreEqual(TimeSpan.Zero, slept);
Assert.AreEqual(0, count);
// handled succeeds
Raise <TimeoutException>(5, policy);
Assert.AreEqual(10.Seconds(), slept);
Assert.AreEqual(5, count);
// handled fails
Expect <TimeoutException>(6, policy);
Assert.AreEqual(20.Seconds(), slept);
Assert.AreEqual(10, count);
}
public void Stack_trace_is_preserved()
{
var policy = ActionPolicy
.Handle <InvalidOperationException>()
.Retry(2);
StackTest <InvalidOperationException> .Check(policy);
}
public void Retry_Once()
{
var policy = ActionPolicy.Handle <TimeoutException>().Retry(0);
// non-handled exception
Expect <ArgumentException>(() => policy.Do(RaiseArgument));
Raise <TimeoutException>(0, policy);
Expect <TimeoutException>(1, policy);
}
public void Stack_trace_is_preserved()
{
var policy = ActionPolicy
.Handle <InvalidOperationException>()
.CircuitBreaker(10.Seconds(), 6);
SystemUtil.SetSleep(s => { });
StackTest <InvalidOperationException> .Check(policy);
}
internal static void Check(ActionPolicy policy)
{
try
{
policy.Do(Fire);
}
catch (TException ex)
{
StringAssert.Contains("InternalStack", ex.StackTrace);
}
}
public void From_is_similar_to_With()
{
var policy = ActionPolicy
.From(e => true)
.Retry(2);
// handled succeeds
Raise <TimeoutException>(2, policy);
// handled fails
Expect <TimeoutException>(3, policy);
}
public void Retry()
{
var policy = ActionPolicy
.Handle <TimeoutException>()
.Retry(2);
// non-handled exception
Expect <ArgumentException>(() => policy.Do(RaiseArgument));
// handled succeeds
Raise <TimeoutException>(2, policy);
// handled fails
Expect <TimeoutException>(3, policy);
}
static void Raise <TException>(int count, ActionPolicy policy)
where TException : Exception, new()
{
int counter = 0;
policy.Do(() =>
{
if (counter < count)
{
counter++;
throw new TException();
}
});
}
public void RetryForever()
{
int counter = 0;
var policy = ActionPolicy
.Handle <TimeoutException>()
.RetryForever(ex => counter += 1);
// non-handled exception
Expect <ArgumentException>(() => policy.Do(RaiseArgument));
Assert.AreEqual(0, counter);
// handled succeeds
Raise <TimeoutException>(11, policy);
Assert.AreEqual(11, counter);
}
public void WaitAndRetry()
{
TimeSpan slept = TimeSpan.Zero;
SystemUtil.SetSleep(span => slept += span);
var policy = ActionPolicy
.Handle <TimeoutException>()
.WaitAndRetry(Range.Create(5, i => i.Seconds()));
Expect <ArgumentException>(() => policy.Do(RaiseArgument));
Assert.AreEqual(TimeSpan.Zero, slept);
Expect <TimeoutException>(() => policy.Do(RaiseTimeout));
Assert.AreEqual(10.Seconds(), slept);
}
public void Retry_With_Action()
{
int counter = 0;
var policy = ActionPolicy
.Handle <TimeoutException>()
.Retry(2, (ex, i) => counter += 1);
// non-handled exception
Expect <ArgumentException>(() => policy.Do(RaiseArgument));
Assert.AreEqual(0, counter);
// handled succeeds
Raise <TimeoutException>(2, policy);
Assert.AreEqual(2, counter);
// handled fails
Expect <TimeoutException>(3, policy);
Assert.AreEqual(4, counter);
}
public void CircuitBreaker()
{
var policy = ActionPolicy
.Handle <TimeoutException>()
.CircuitBreaker(1.Minutes(), 2);
var time = new DateTime(2008, 1, 1);
SystemUtil.SetTime(time);
// non-handled
policy.Do(Nothing);
Expect <ArgumentException>(() => policy.Do(RaiseArgument));
// handled below
// Raise
Expect <TimeoutException>(() => policy.Do(RaiseTimeout));
Expect <TimeoutException>(() => policy.Do(RaiseTimeout));
// Trigger
Expect <TimeoutException>(() => policy.Do(RaiseArgument));
Expect <TimeoutException>(() => policy.Do(Nothing));
// Elapse and pass
SystemUtil.SetTime(time.AddMinutes(1));
policy.Do(Nothing);
// Raise
Expect <TimeoutException>(() => policy.Do(RaiseTimeout));
Expect <TimeoutException>(() => policy.Do(RaiseTimeout));
// Elapse and rearm
SystemUtil.SetTime(time.AddMinutes(1));
Expect <TimeoutException>(() => policy.Do(RaiseTimeout));
// Non-elapse and trigger
SystemUtil.SetTime(time.AddSeconds(119));
Expect <TimeoutException>(() => policy.Do(Nothing));
// Elapse and pass
SystemUtil.SetTime(time.AddMinutes(2));
policy.Do(Nothing);
}
/// <summary>
/// Creates generic reliability wrapper around the <see cref="IProvider{TKey,TValue}"/>
/// </summary>
/// <param name="provider"></param>
/// <param name="policy"></param>
public HandlingProvider(IProvider <TKey, TValue> provider, ActionPolicy policy)
{
_provider = provider;
_policy = policy;
}
static void Expect <TException>(int count, ActionPolicy policy)
where TException : Exception, new()
{
Expect <TException>(() => Raise <TException>(count, policy));
}