protected override bool?RunTest(ref string message)
{
Semaphore semaphore;
try
{
semaphore = _repo.Probe(nameof(Executor));
}
catch
{
message = $"SQL error, check database. See also {nameof(SqlRepositoryHealthCheck)}.";
return(false);
}
DateTime cutOffPoint = _timeProvider.GetUtcNow().Add(new TimeSpan(0, -15, 0));
if (semaphore.HeartBeat < cutOffPoint)
{
message = $"The hearthbeat is more than 15 minutes old and has therefore experired. Current owner id is {semaphore.CurrentOwnerId}. ";
return(false);
}
else
{
message = $"The hearthbeat has not experired.";
return(true);
}
}
public void SemaphoreTest()
{
Assert.That(SemaphoreRepository.MaxAge > TimeSpan.FromSeconds(2),
"Can not complete the test with a SemaphoreMaxAge less than 2 sec.");
var callerId1 = "CommonRepoTest1";
string currentOwner;
Assert.That(SemaphoreRepository.Get(_semaphoreId, callerId1, out currentOwner), Is.True,
"Should get lock from empty repo");
Assert.That(callerId1, Is.EqualTo(currentOwner),
"Current owner should be set correctly");
// Make a time step less than SemaphoreMaxAge
TimeProvider.Step(SemaphoreRepository.MaxAge.Add(TimeSpan.FromSeconds(-1)));
var callerId2 = "CommonRepoTest2";
Assert.That(SemaphoreRepository.Get(_semaphoreId, callerId2, out currentOwner), Is.False,
"Another caller should not get the lock before max age has expired.");
Assert.That(callerId1, Is.EqualTo(currentOwner),
"Current owner should not have changed.");
Assert.That(SemaphoreRepository.Get(_semaphoreId, callerId1, out currentOwner), Is.True,
"First caller should still get the lock");
Assert.That(callerId1, Is.EqualTo(currentOwner),
"Current owner should not have changed.");
// Make a time step more than SemaphoreMaxAge
TimeProvider.Step(SemaphoreRepository.MaxAge.Add(TimeSpan.FromSeconds(1)));
Assert.That(SemaphoreRepository.Get(_semaphoreId, callerId2, out currentOwner), Is.True,
"The semaphore max age has been exceded ownership change should be allowed.");
Assert.That(callerId2, Is.EqualTo(currentOwner),
"The current owner is changed correctly to 2nd caller id.");
Assert.That(SemaphoreRepository.Get(_semaphoreId, callerId1, out currentOwner), Is.False,
"The previous caller is denied, since the semaphore has moved to 2nd caller");
Assert.That(callerId2, Is.EqualTo(currentOwner),
"Current owner should not have changed.");
var probe = SemaphoreRepository.Probe(_semaphoreId);
Assert.That(probe.SemaphoreId, Is.EqualTo(_semaphoreId));
Assert.That(probe.CurrentOwnerId, Is.EqualTo(callerId2));
Assert.That(probe.HeartBeat, Is.EqualTo(TimeProvider.GetUtcNow()));
}