Hi Yuxiao Zhai,
The reason why the program terminates after the event in A has been triggered twice is because the events are triggering each other in a loop, which leads to a recursive call of the showName() method in both objects A and B. Each time the showName() method is called, it triggers the event in the other object, which in turn triggers the event in the original object, and so on.
Since there is no exit condition for this loop, it continues indefinitely until the program reaches the maximum recursion depth, which is set by default to 500 in MATLAB. Once this limit is reached, MATLAB throws an error message and terminates the program.
To prevent this infinite loop, you can add a condition in the showName() method to stop the recursion after a certain number of iterations. For example, you can define a counter variable in each object and increment it each time the method is called. Then you can add a condition to check if the counter has reached a maximum value, and if so, stop the recursion by not triggering the event.
classdef myClass < handle
properties
Name
Counter
MaxCounter
end
events
theEvent
end
methods
function obj = myClass(c, maxCounter)
obj.Name = c; obj.Counter = 0;
obj.MaxCounter = maxCounter;
end
function showName(obj)
obj.Counter = obj.Counter + 1;
if obj.Counter <= obj.MaxCounter
disp(['This is obj ', obj.Name])
notify(obj, 'theEvent')
end
end
end
end
The constructor takes an additional argument maxCounter, which sets the maximum number of times the showName() method can be called. The method checks if the counter is less than or equal to this maximum value before triggering the event. This ensures that the recursion stops after a certain number of iterations, and the program does not terminate due to a maximum recursion depth error.
