ceph/src/jaegertracing/opentelemetry-cpp/third_party/prometheus-cpp/3rdparty/civetweb/src/third_party/duktape-1.8.0/examples/eventloop/curses-timers.js

   1 /*
   2  *  Test using timers and intervals with curses.
   3  */
   4
   5 if (typeof Ncurses !== 'object') {
   6     throw new Error('Ncurses required');
   7 }
   8
   9 function fillScreen(ch) {
  10     var size, w, h;
  11     var i, j;
  12
  13     size = Ncurses.getmaxyx();
  14     h = size[0];
  15     w = size[1];
  16
  17     for (i = 0; i < h; i++) {
  18         for (j = 0; j < w; j++) {
  19             Ncurses.mvprintw(i, j, ch);
  20         }
  21     }
  22     Ncurses.refresh();
  23 }
  24
  25 function main() {
  26     var i, j;
  27     var counters = [];
  28     var size, w, h;
  29
  30     Ncurses.initscr();
  31     size = Ncurses.getmaxyx();
  32     h = size[0];
  33     w = size[1];
  34
  35     fillScreen('.');
  36
  37     setInterval(function () {
  38         Ncurses.mvprintw(1, 4, new Date().toISOString());
  39         Ncurses.refresh();
  40     }, 1000);
  41
  42     function addCounter(row, index, interval) {
  43         counters[index] = 0;
  44         setInterval(function () {
  45             counters[index]++;
  46             Ncurses.mvprintw(row, 4, '' + Date.now() + ' ' + counters[index]);
  47             Ncurses.refresh();
  48         }, interval);
  49     }
  50
  51     function addRandomChar(row, col, interval) {
  52         setTimeout(function () {
  53             Ncurses.mvprintw(row, col, String.fromCharCode(Math.random() * 64 + 0x20));
  54             Ncurses.refresh();
  55         }, interval);
  56     }
  57
  58     for (i = 0; i < h - 5; i++) {
  59         addCounter(3 + i, i, 363 * i + 400);
  60     }
  61
  62     /* Here the inserts take a lot of time because the underlying timer manager
  63      * data structure has O(n) insertion performance.
  64      */
  65     for (i = 0; i < h - 5; i++) {
  66         for (j = 0; j < w - 50; j++) {
  67             // Math.exp(0)...Math.exp(8) is an uneven distribution between 1...~2980.
  68             addRandomChar(3 + i, 28 + j, 58000 - Math.exp(Math.random() * 8) * 20);
  69         }
  70     }
  71
  72     setTimeout(function () {
  73         Ncurses.endwin();
  74         Ncurses.delscreen();
  75         requestEventLoopExit();
  76     }, 120e3);
  77 }
  78
  79 main();