"ReceiptHandle": "AQEBAbg4vEIbQ+OC/o7R/R5CmZMHv5cKcfzn7LCiKnm+u1p2jabE+Z9mm0b0/wpf+H3Qnh7BE/FtjErqifBMudHIFzpZhHcEy7wxvXuK1AhzpPhimnbIdM/BSmWLyOKADw+xmbngIoSNAlzeqHTIEuxOt9+5ULxki/JW6ar9SBnur6CHNGvzg34c4hblXKdBnlf34QWs/NS1rE8SZ6ErHTEvFBugz0aY7GaIQlLzaevZyXTnLkajLnU+9GZ+i/fcx0+qx+hGJQ9Hm4Ko66xTDGqdTg=", If you execute the script you’ll see this output. QUEUE_URL=$(aws sqs create-queue -queue-name test.fifo -attributes FifoQueue=true,ContentBasedDeduplication=true -query QueueUrl -output text)Īws sqs send-message -message-body "Message 1" -message-group-id 1 -queue-url "$QUEUE_URL" > /dev/nullĪws sqs send-message -message-body "Message 2" -message-group-id 1 -queue-url "$QUEUE_URL" > /dev/nullĪws sqs send-message -message-body "Message 3" -message-group-id 1 -queue-url "$QUEUE_URL" > /dev/nullĪws sqs receive-message -queue-url "$QUEUE_URL"Īws sqs delete-queue -queue-url "$QUEUE_URL" attempt to receive a message from the queue again.attempt to receive a message from the queue.send 3 messages to the queue, all with the same message group id.To demonstrate this, we’ll run a shell script which uses the AWS CLI to: If it’s received by a consumer, but for whatever reasons fails to process and isn’t deleted, then no other messages with the same message group id can be received. Sample model: QUEUE functions.Message 1 is at the front of the queue. Waiting= QUEUE FIFO(Arriving,Servicing,Init Profile,100,20) However, for discrete time (difference equation) models this can be significant.
For example:įor continuous models this is usually a minor point. This means that if you want to allow the current period's inflow to be used as part of the current period's outflow you need to add it in. Note that because a queue is like a level, the value depends on the inflow and outflow from previous times, not the current inflow and outflow. If a queue goes negative it is treated as having entries only from the previous time step (both the average and oldest age will be equal to TIME STEP). Similarly, if outflow is negative it is treated as a positive inflow. If inflow is negative it is treated as a positive outflow. To make sense both inflow and outflow should be positive and outflow should be controlled so that the queue never goes negative.īehavioral Notes: Queues are slower to compute and require more memory than ordinary levels and thus should only be used when you need to apply a QUEUE. Restrictions: QUEUE FIFO must appear directly after the = sign. Also, unlike an ordinary Level the value of a queue will never change within a time step so that using Runge-Kutta integration will give different results if queues are used instead of ordinary Levels. All of the y values in the Lookup should be greater than or equal to 0.Ī queue is the same as a Level defined using an INTEG equation except that you can use the functions QUEUE AGE AVERAGE, QUEUE AGE IN RANGE and QUEUE AGE OLDEST to get information about what is in the queue. profile is effectively a probability distribution function that is automatically renormalized to have an x axis running from 0 to age range and an area of 1. At the initial time to content of the queue ( initial ) is distributed over age TIME STEP to age range + TIME STEP with a profile given by the Lookup function profile. Defines a variable to be a Level with the specified inflow, outflow and initial value.
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