/// <summary>
/// Calls the subscriber service.
/// </summary>
/// <param name="subscriber">The subscriber.</param>
public void CallSubscriberService(Subscriber subscriber)
{
bool passed;
passed = ServicePollPassed(subscriber);
if (!passed)
{
if (!ServiceOutage(subscriber.Service))
{
// check for the grace time ??
// if exist wait before notification send
// check to see if service online before end of gracetime
// if grace time < polling frequency extra check is required
if (subscriber.GraceTime > 0)
{
Thread.Sleep(subscriber.GraceTime);
passed = ServicePollPassed(subscriber);
if (subscriber.GraceTime < subscriber.PollingFrequency)
{
passed = ServicePollPassed(subscriber);
}
if (!passed)
{
_notification.Send(subscriber.Service.Ip, subscriber.Service.Port);
}
}
else
{
_notification.Send(subscriber.Service.Ip, subscriber.Service.Port);
}
}
}
}
public void AddToSubscriptionList_registers_a_new_Subscriber()
{
var sub = new Subscriber
{
Id = 1,
Name = "Nino"
};
var allsubs = _notification.GetSubscriptionList();
Assert.IsTrue(!allsubs.Any());
_notification.AddToSubscriptionList(sub);
Assert.IsTrue(allsubs.Count() == 1);
}
/// <summary>
/// Enables the specified caller.
/// </summary>
/// <param name="caller">The caller.</param>
/// <exception cref="System.ArgumentNullException">caller</exception>
public void Enable(Subscriber caller)
{
if(caller == null)
throw new ArgumentNullException("caller");
var allServices = _nodeProvider.GetAllAvailableServices();
// we should check if service is not already available
// otherwize just add the caller to notification list
var serviceExist = allServices.Any(a => a.Ip == caller.Service.Ip && a.Port == caller.Service.Port);
// either case the caller gets registered for notifications
_notification.AddToSubscriptionList(caller);
if (!serviceExist)
{
// if service does not exist, add to the service list
_nodeProvider.AddService(caller.Service);
var timer = new Timer(o => _connection.CallSubscriberService(caller), null, 0, caller.PollingFrequency);
}
}
public void CallSubscribedServies_sends_notification_on_Failure()
{
var thisSubsriber = new Subscriber
{
PollingFrequency = 100000,
Service = new Node
{
Ip = "127.0.0.1",
Port = 11111,
OutageStartTime = DateTime.Now,
OutageEndTime = DateTime.Now.AddHours(-1)
}
};
_notification.Expect(a => a.GetSubscriptionList()).Return(GetSubscribers());
_connection.CallSubscriberService(thisSubsriber);
_notification.AssertWasCalled(
a =>
a.Send(thisSubsriber.Service.Ip, thisSubsriber.Service.Port));
}
public void Enable_only_calls_CallSubscriberService_for_newServices()
{
var nodeList = new List<Node>
{
new Node
{
Ip = "127.0.0.1",
Port = 11112,
}
};
var sub = new Subscriber
{
Service = nodeList.First()
};
_nodeProvider.Expect(a => a.GetAllAvailableServices()).Return(nodeList);
_register.Enable(sub);
// passing same service
_connection.AssertWasNotCalled(a => a.CallSubscriberService(sub));
}
/// <summary>
/// Services the poll passed.
/// </summary>
/// <param name="subscriber">The subscriber.</param>
/// <returns></returns>
/// <exception cref="System.ArgumentNullException">criteria</exception>
/// <exception cref="System.IO.InvalidDataException">Ip</exception>
/// <exception cref="System.ArgumentOutOfRangeException">frequency most be higher than a second</exception>
public bool ServicePollPassed(Subscriber subscriber)
{
if (subscriber.Service == null)
throw new ArgumentNullException("criteria");
if(!IsIPV4(subscriber.Service.Ip))
throw new InvalidDataException("Ip");
if (subscriber.PollingFrequency < MIN_FREQUENCY)
throw new ArgumentOutOfRangeException("frequency most be higher than a second");
while (true)
{
try
{
TryConnect(subscriber.Service);
}
catch (Exception)
{
return false;
}
var reader = new StreamReader(_client.GetStream());
string line = string.Empty;
while (TestConnection(subscriber.PollingFrequency))
{
try
{
// this is how we check to see if conection is still online
line = reader.ReadLine();
}
catch
{
return false;
}
}
}
}
public void Enable_Will_calls_all_expected_services_for_newServices()
{
var nodeList = new List<Node>
{
new Node
{
Ip = "192.168.0.1",
Port = 11112,
}
};
var sub = new Subscriber
{
Service = GetTestSubscribers().First().Service
};
_nodeProvider.Expect(a => a.GetAllAvailableServices()).Return(nodeList);
_register.Enable(sub);
// passing same service
_connection.AssertWasCalled(a => a.CallSubscriberService(sub));
_nodeProvider.AssertWasCalled(a => a.AddService(sub.Service));
}
/// <summary>
/// Adds to subscription list.
/// </summary>
/// <param name="caller">The caller.</param>
public void AddToSubscriptionList(Subscriber caller)
{
SubscriptionList.Add(caller);
}