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

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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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The "number of entities in the Queue" can be found in the 'Statistics' tab of the Queue's properties.

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Enabling it (clicking it's checkbox) will enable the signal of interest on the block (#n) that can be connected to other Simulink blocks.

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Connect the #n signal to "compare to constant" block to create a boolean signal that indicates if the queue is / is not empty.

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