// private methods
private void ThreadStart()
{
_state = DnsMonitorState.Running;
try
{
Monitor();
}
catch (OperationCanceledException)
{
// ignore OperationCanceledException
}
catch (Exception exception)
{
_unhandledException = exception;
if (_sdamInformationEventHandler != null)
{
var message = $"Unhandled exception in DnsMonitor: {exception}.";
var sdamInformationEvent = new SdamInformationEvent(() => message);
_sdamInformationEventHandler(sdamInformationEvent);
}
_state = DnsMonitorState.Failed;
return;
}
_state = DnsMonitorState.Stopped;
}
// constructors
public DnsMonitor(IDnsMonitoringCluster cluster, IDnsResolver dnsResolver, string lookupDomainName, IEventSubscriber eventSubscriber, CancellationToken cancellationToken)
{
_cluster = Ensure.IsNotNull(cluster, nameof(cluster));
_dnsResolver = Ensure.IsNotNull(dnsResolver, nameof(dnsResolver));
_lookupDomainName = EnsureLookupDomainNameIsValid(lookupDomainName);
_cancellationToken = cancellationToken;
_service = "_mongodb._tcp." + _lookupDomainName;
_state = DnsMonitorState.Created;
eventSubscriber?.TryGetEventHandler(out _sdamInformationEventHandler);
}
public void Start_should_set_state_to_Running_when_starting()
{
var mockCluster = new Mock <IDnsMonitoringCluster>();
var subject = CreateSubject(cluster: mockCluster.Object);
DnsMonitorState actualState = (DnsMonitorState)(-1);
mockCluster
.Setup(m => m.ShouldDnsMonitorStop())
.Returns(() => { actualState = subject.State; return(true); });
var thread = subject.Start();
thread.Join();
actualState.Should().Be(DnsMonitorState.Running);
}
