public void MediaRetryPolicyTestExecuteAsyncTrivial()
{
MediaRetryPolicy target = new TestMediaServicesClassFactory(null).GetSaveChangesRetryPolicy();
int expected = 10;
var task = target.ExecuteAsync(() => Task.Factory.StartNew<int>(() => expected));
Assert.AreEqual(expected, task.Result);
}
public void MediaRetryPolicyTestExecuteAsyncNonTransient()
{
MediaRetryPolicy target = new TestMediaServicesClassFactory(null).GetSaveChangesRetryPolicy();
int exceptionCount = 2;
int expected = 10;
var fakeException = new WebException("test", WebExceptionStatus.RequestCanceled);
Func<int> func = () =>
{
if (--exceptionCount > 0) throw fakeException;
return expected;
};
try
{
var task = target.ExecuteAsync(() => Task.Factory.StartNew<int>(() => func()));
task.Wait();
var result = task.Result;
}
catch (AggregateException ax)
{
WebException x = (WebException)ax.Flatten().InnerException;
Assert.AreEqual(1, exceptionCount);
Assert.AreEqual(fakeException, x);
throw x;
}
Assert.Fail("Expected exception");
}
public void MediaRetryPolicyTestExecuteAsyncRetry()
{
MediaRetryPolicy target = new TestMediaServicesClassFactory(null).GetSaveChangesRetryPolicy();
int exceptionCount = 2;
int expected = 10;
var fakeException = new WebException("test", WebExceptionStatus.ConnectionClosed);
Func<int> func = () =>
{
if (--exceptionCount > 0) throw fakeException;
return expected;
};
var task = target.ExecuteAsync(() => Task.Factory.StartNew<int>(() => func()));
Assert.AreEqual(expected, task.Result);
Assert.AreEqual(0, exceptionCount);
}
public void MediaRetryPolicyTestExecuteAsyncBackoff()
{
MediaRetryPolicy target = new TestMediaServicesClassFactory(null).GetSaveChangesRetryPolicy();
int exceptionCount = 5;
int expected = 10;
var fakeException = new WebException("test", WebExceptionStatus.ConnectionClosed);
TimeSpan lastInterval = TimeSpan.Zero;
DateTime lastInvoked = DateTime.UtcNow;
Func<int> func = () =>
{
TimeSpan newInterval = DateTime.UtcNow - lastInvoked;
TimeSpan delta = newInterval - lastInterval;
Assert.IsTrue(exceptionCount > 3 || delta.TotalMilliseconds > 1, "Iterations left:{0} interval increase too small from {1} to {2}", exceptionCount, lastInterval, newInterval, delta);
lastInvoked = DateTime.UtcNow;
lastInterval = newInterval;
if (--exceptionCount > 0) throw fakeException;
return expected;
};
var task = target.ExecuteAsync(() => Task.Factory.StartNew<int>(() => func()));
Assert.AreEqual(expected, task.Result);
Assert.AreEqual(0, exceptionCount);
}