private static int GetRunningTaskCount()
{
int count = 0;
var tasks = Tasks.Values.ToList();
for (int i = 0; i < tasks.Count; i++)
{
DataTask dt = tasks[i];
if (dt == null)
{
continue;
}
Task t = dt.Task;
if (t.Status == TaskStatus.Canceled || t.Status == TaskStatus.Faulted)
{
continue;
}
if (t.Status == TaskStatus.Created || t.Status == TaskStatus.WaitingForActivation)
{
continue;
}
if (t.Status == TaskStatus.RanToCompletion)
{
continue;
}
count++;
}
return(count);
}
public static object GetData(object owner, string dataName, TimeSpan updateInterval, object nullValue, Func <object> getData)
{
Dictionary <string, object> props = GetProperties(owner);
object res = nullValue;
if (!props.TryGetValue(dataName, out res))
{
props.Add(dataName, nullValue);
res = nullValue;
}
if (!object.Equals(res, nullValue))
{
return(res);
}
DataTask dt = null;
if (!Tasks.TryGetValue(GetKey(owner, dataName), out dt))
{
CreateTask(owner, dataName, getData);
}
else
{
dt.Priority++;
}
UpdateTasks();
return(nullValue);
}
private static void CreateTask(object owner, string dataName, Func <object> getData)
{
string key = GetKey(owner, dataName);
Task <object> t = new Task <object>(() => {
object res = getData();
SetValue(owner, dataName, res);
OnTaskCompleted(owner);
return(res);
});
DataTask dt = new DataTask()
{
Task = t, Priority = 1
};
Tasks.Add(GetKey(owner, dataName), dt);
if (GetRunningTaskCount() < MaxAllowedTaskCount)
{
t.Start();
}
}