The Init transition is the only transition that is enabled in the initial marking. There is no token on the place in the initial marking. The color set for the place is a timed color set, and the time stamp of the token on the place will determine when the Arrive transition can occur. The System page provides the most abstract representation of the queue system.Ī token on the place Next is used to determine when new jobs arrive. The name of the simulation output directory is accessed via the function Output.getSimOutputDir which is one of the output management functions. The name of the file is Trans_Log_File.txt, and it will be saved in a simulation output directory.
Queue anylogic enable preemption update#
The function initfile initializes a file that a user-defined monitor will update during simulations. The function getfid will return the file identifier that fileid refers to, assuming that fileid does not refer to the value NONE. For more information about TextIO.outstream and option values, see the online help pages for the TextIO structure and the Option structure in the SML Basis Library. The variable is a reference to a TextIO.outstream option.
The reference variable fileid is used in a user-defined monitor that is described on the help page for Queue System Miscellaneous Monitors. The reference variable longdelaytime is used to indicate the lower limit for what will be considered long waiting times for jobs in the queue. Val filename = OS.ncat (Output.getSimOutputDir(), (* this will raise Option exception if fileid = NONE *) Globref fileid = (NONE : TextIO.outstream option) The value of the AT field is set using the intTime function which is used to store the model time at which the job was created. it will return either A or B when it is invoked. The JobType.ran() is a color set function that returns a random value from the color set JobType, i.e. The function newJob returns a value from the color set Job.
Queue anylogic enable preemption simulator#
The type of model time values is described on the help page for simulator functions.
The function intTime converts the current model time to an integer value. The function uses the exponential random distribution function. The function expTime is used to generate integer values that are approximately exponentially distributed with a mean value determined by the parameter mean. The color set ServerxJob a product color set that is used to represent the server when it is busy processing a job. the time at which the job arrived in the system. The AT field is of type INT, and it is used to store the arrival time of the job, i.e. The field named jobType determines the type of the job since it has type JobType. The color set Job models a job as a record consisting of two fields. The color set JobType is an enumeration color set that defines the two types of jobs: A and B. In this system there are two types of jobs. SYSTEM DECLSĬolset ServerxJob = product Server * Job timed Some of the important declarations are briefly explained. The other block, named MONITOR DECLS, contains declarations that are used either only in monitors or to change options in the performance facilities.Īll declarations for the net are shown below. One declaration block, named SYSTEM DECLS, contains the declarations that are used in the net structure. The declarations for the net are organized in two declaration blocks. The net can also be downloaded from here. Samples/QueueSystem/QueueSystem.cpn where is the directory in which CPN Tools is installed. This example will show how monitors can be used to calculate different kinds of statistics regarding, e.g., the length of the queue of jobs, the amount of time that jobs spend in the queue, and the percentage of time that the server is busy processing jobs. Several different performance measures can be calculated for this system.
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