skyquake/plugins/composer/src/src/libraries/InstanceCounter.js

   1 /**
   2  * Created by onvelocity on 1/28/16.
   3  */
   4
   5 function getInstanceCount(type, bump = true) {
   6         // keep a global counter
   7         let count = 0;
   8         const data = sessionStorage.getItem('instance-counts');
   9         const counts = JSON.parse(data || '{}');
  10         if (counts.hasOwnProperty(type)) {
  11                 count = counts[type];
  12                 if (bump) {
  13                         counts[type] = ++count;
  14                 } else {
  15                         return count;
  16                 }
  17         } else {
  18                 count = counts[type] = 1;
  19         }
  20         sessionStorage.setItem('instance-counts', JSON.stringify(counts));
  21         return count;
  22 }
  23
  24 export default {
  25
  26         /**
  27          * Get instance count for given type without bumping the number.
  28          *
  29          * @param type
  30          * @returns {number}
  31          */
  32         current(type) {
  33                 return getInstanceCount(type, false);
  34         },
  35
  36         /**
  37          * Get the instance count for the given type - will bump the counter and return the new value.
  38          *
  39          * @param type
  40          * @returns {number}
  41          */
  42         count(type) {
  43                 return getInstanceCount(type);
  44         }
  45
  46 }