من هم درک مناسبی از مطالب ذکر شده نداشتم با اینحال چیزی که متوجه شدم اینه :
// Class A with Test method and callerspublic class A
{
// Singleton instance of class A
private static A instance = null;
// Last time Test method was called
private DateTime? lastTestCall = null;
// Dictionary to store last call time of each caller
private Dictionary<string, DateTime> lastCallerCalls = new Dictionary<string, DateTime>();
// Get the singleton instance of class A
public static A Instance
{
get
{
if (instance == null)
{
instance = new A();
}
return instance;
}
}
// Private constructor for singleton pattern
private A() { }
// Check if Test method can be called based on last call times of Test and callers
private bool CanCallTest()
{
return !lastTestCall.HasValue || lastCallerCalls.Values.All(callTime => callTime < lastTestCall.Value);
}
// Update the last call time of a caller
private void UpdateLastCallerCall(string callerName)
{
lastCallerCalls[callerName] = DateTime.Now;
}
// Caller_1 method that calls Test method if conditions are met
public void Caller_1()
{
if (CanCallTest())
{
Test();
}
UpdateLastCallerCall("Caller_1");
}
// Test method that performs a certain task
private void Test()
{
lastTestCall = DateTime.Now;
// Code for the Test method
NotifyObservers();
}
// List of observers that need to be updated when Test method is called
private List<IObserver> observers = new List<IObserver>();
// Attach an observer to the list
public void Attach(IObserver observer)
{
observers.Add(observer);
}
// Detach an observer from the list
public void Detach(IObserver observer)
{
observers.Remove(observer);
}
// Notify all observers in the list
private void NotifyObservers()
{
foreach (IObserver observer in observers)
{
observer.Update();
}
}
}
وبرای کلاس B
// Class B with callers that call Test method in class Apublic class B
{
// Instance of class A
private A a = A.Instance;
// Caller_2 method that calls Test method in class A if conditions are met
public void Caller_2()
{
if (a.CanCallTest())
{
a.Test();
}
a.UpdateLastCallerCall("Caller_2");
}
// Caller_3 method that calls Test method in class A if conditions are met
public void Caller_3()
{
if (a.CanCallTest())
{
a.Test();
}
a.UpdateLastCallerCall("Caller_3");
}
}