Allow only a fixed number of agents to pass through a queue block periodically in Anylogic

I am using a Queue and hold block together, where the hold remains blocked until all the agents arrive at the Queue block.

How to change it and want to allow only a fixed number of agents (say 5 agents) at fixed intervals of time(say every 3 minutes)? Current properties of my Queue and hold block:

queue_block_properties

hold_block_properties

Create a cyclic event with recurrence time 3 minutes. Also create a variable which you can name count of type int.

In the event action field write:

count = 0;
hold.unblock();

Then, in the On enter field of the hold block write the following:

count++;
if( count == 5 ) {
   self.block();
}

The only question that I have is whether you want every 3 minutes to have exactly 5 agents leave or whether it's okay if they arrive a bit later. In other words if after 3 minutes, there are only 3 agents in the queue, do they leave and the hold remains unblocked in case another 2 arrive before the next cycle? Or does the hold block blocks again immediately?

In the solution I provided, if there are less than 5 at the cycle time occurrence, and then new agents arrive before the next cycle, they can pass.

Otherwise, create a new variable called target for example and write the following in the event action:

count= 0;

if( queue.size() >= 5 ) {
    target = 5;
    hold.unblock();

}

else if ( queue.size() > 0 ) {
    target = queue.size();
    hold.unblock();
}

And in the on enter of the hold, write:

count++;

if( count == target ) {
self.block();
target = 0;
}