Newton's Principia Mathematica

    arrivals

    2.1.2 • Public • Published

    arrivals

    arrivals models arrival events in a system, e.g.:

    • visitors arriving to use a website
    • incoming phone calls to an exchange
    • ghosts spawning in Pacman

    This library was originally developed for use in Artillery, a modern load testing toolkit.

    Usage

    npm install arrivals

    Two models of arrival processes are available: Poisson and Uniform (arrivals at a specified constant rate).

    //
    // Poisson process example
    //
    var arrivals = require('arrivals');
     
    // Create a Poisson process with the mean inter-arrival time of 500 ms that
    // will run for 20 seconds:
    var p = arrivals.poisson.process(500, 20 * 1000);
     
    p.on('arrival', function onArrival() {
      console.log('New arrival, %s', new Date());
    });
     
    p.once('finished', function() {
      console.log('We are done.');
    });
     
    p.start();

    If the last argument (total duration of the process) is omitted, the process will run until stopped with p.stop().

    //
    // Uniform arrivals example:
    //
    var arrivals = require('arrivals');
     
    // Create an arrivals process that will trigger the callback every 500ms for
    // 20 seconds (for a total of 20000 / 200 = 40 arrivals)
    var p = arrivals.uniform.process(500, 20 * 1000);
     
    p.on('arrival', function onArrival() {
      console.log('New arrival, %s', new Date());
    }
     
    p.once('finished', function() {
      console.log('We are done.');
    });
     
    p.start();

    The last argument (total duration) is optional as in the previous example.

    License

    This software is distributed under the terms of the ISC license.

    Copyright (c) 2015-2017, Hassy Veldstra <h@artillery.io>
    
    Permission to use, copy, modify, and/or distribute this software for any
    purpose with or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.
    
    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
    REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
    AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
    INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
    LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
    OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
    PERFORMANCE OF THIS SOFTWARE.
    

    Install

    npm i arrivals

    DownloadsWeekly Downloads

    63,331

    Version

    2.1.2

    License

    ISC

    Unpacked Size

    9.1 kB

    Total Files

    6

    Last publish

    Collaborators

    • hhvhhv
    • shoreditch-ops