how to determine whether a queue is empty in Simevents and do some actions based on this observation?

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Tianhao Guo
Tianhao Guo 2016-4-23
评论： Tianhao Guo 2016-4-27
Hi guys,
I want to model a queue with vacations. When the queue is empty, the server will have a period of vacation with certain distribution.(I can use use gate to block the server ) So I need to get the data of the number of entity in queue block. Could you please tell me how to do that?
Many thanks.
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Tianhao Guo
Tianhao Guo 2016-4-23
编辑：Tianhao Guo 2016-4-23
Sorry that I am not very familiar with Matlab. Maybe I can write a discrete event-driven queue using customized block. So if you know where to find these kinds of resources. It will be of great help as well.

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回答（1 个）

Nikhil Vyas
Nikhil Vyas 2016-4-27
The Queue blocks(and almost all the other similar blocks of simevents) has a Statistics Tab in the Block Parameters.
This would result in an additional port #n appearing on the block. You can monitor this port to check the number of entities in the queue at any time. If #n gives you 0, the queue is currently empty.
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Tianhao Guo
Tianhao Guo 2016-4-27
Thank you for you answer. Sorry, I didn't explain clearly. A queue with vacation means that I need to close the gate as soon as the queue is empty. Then how to monitor this port? Maybe I should let the queue trigger something when it is empty.

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