how to control entities in the queue

2 次查看（过去 30 天）
Muhammad Asad Hanif
回答： Shreshth 2024-8-28
I want to control the entities in the queue block. For example I have two entities in queue block and connected server has the capacity of 1 followed by another server with the capacity 1. Now I want that second entity only leaves the queue when 1st entity leaves the second server.
I think, this is control by writing code in "exit", of "event actions" in queue block.

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回答（1 个）

Shreshth
Shreshth 2024-8-28
Hey Asad,
To control entity departure in a Simulink Queue block:
  1. Open the Queue Block: Double-click the Queue block in your model.
  2. Access Event Actions: Go to the "Event Actions" tab.
  3. Modify "Exit" Event:
  • Write MATLAB code to control entity departure.
  • Use a persistent flag to track if the first entity has left the second server.
Example code:
persistent firstEntityProcessed;
if isempty(firstEntityProcessed)
firstEntityProcessed = false;
end
if firstEntityProcessed
% Allow second entity to leave
else
% Hold second entity in queue
end
% Update `firstEntityProcessed` when the first entity leaves the second server
4. Set Up State Update: Ensure firstEntityProcessed is updated when the first entity exits the second server.
5.Test: Run the simulation to verify behavior.
Hope it helps.

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