public Subscription(
IProcessInstancesClient userTaskClient,
OnProcessInstanceCallback callback,
InstanceSubscriptionSettings subscriptionSettings)
{
_instanceClient = userTaskClient ?? throw new ArgumentNullException(nameof(userTaskClient));
_callback = callback ?? throw new ArgumentNullException(nameof(callback));
_subscriptionSettings = subscriptionSettings ?? throw new ArgumentNullException(nameof(subscriptionSettings));
_stopSignal = new CancellationTokenSource();
}
public void SubscribeForProcessInstanceStateChange(string processId, Func <ProcessInstance, ProcessState> action)
{
var subscriptionSettings = new InstanceSubscriptionSettings
{
SubscribeOnce = false,
ConfigureQuery = o =>
{
o.FilterByProcessInstanceId(processId);
o.FilterByStates(ProcessState.Error, ProcessState.Finished, ProcessState.Terminated);
}
};
var handledInstance = ProcessState.Running;
Func <ProcessState> getRecentInstanceState = () => handledInstance;
Action <ProcessState> updateRecentInstanceState = instance => { handledInstance = instance; };
void Callback(IEnumerable <ProcessInstance> instances)
{
try
{
var processInstances = instances.ToList();
switch (processInstances.ToList().Count)
{
case 0: return;
}
var instance = processInstances.First();
if (!instance.State.Equals(getRecentInstanceState()))
{
updateRecentInstanceState(action(instance));
}
_logger.Log(LogLevel.Debug,
$"Handled instance state change: {processId}:{getRecentInstanceState()}");
}
catch (Exception e)
{
Console.WriteLine(e);
throw;
}
}
_instanceClient.SubscribeForProcessesInstances(Callback, subscriptionSettings);
}
public static ISubscription SubscribeForProcessesInstances(
this IProcessInstancesClient client,
OnProcessInstanceCallback callback,
InstanceSubscriptionSettings subscriptionSettings
)
{
var subscriptionSettings1 = subscriptionSettings ?? new InstanceSubscriptionSettings();
if (subscriptionSettings1.FetchInterval <= TimeSpan.Zero)
{
throw new ArgumentException(
$"Fetch interval '{subscriptionSettings1.FetchInterval}' should be positive.");
}
var subscription = new Subscription(client, callback, subscriptionSettings1);
subscription.StartAsync();
return(subscription);
}
