How to flush the cache

Question

In Apps Script I need a way to flush the cache regardless of key. Alternatively I need a way to find all the keys which are currently cached.

When we cache items we

Answer 1

Cache is faster than properties? Don't think so, check out this:

function propertiesUser() { // 1272.0 , 1135.0
  var value = { a: 'a', b: 'b' }
  var key = 'ab';
  PropertiesService.getUserProperties().setProperty(key, value);
  var i = 0;
  var t = Date.now();
  while (i<100) {
    Logger.log( PropertiesService.getUserProperties().getProperty(key))
    i++
  }
  Logger.log( Date.now()-t);
}

function propertiesScript() { // 1190.0
  var value = { a: 'a', b: 'b' }
  var key = 'ab';
  PropertiesService.getScriptProperties().setProperty(key, value);
  var i = 0;
  var t = Date.now();
  while (i<100) {
    Logger.log( PropertiesService.getScriptProperties().getProperty(key))
    i++
  }
  Logger.log( Date.now()-t);
}

function cache() { // 4141.0
  var value = { a: 'a', b: 'b' }
  var key = 'ab';
  CacheService.getUserCache().put(key, JSON.stringify(value))
  var i = 0;
  var t = Date.now();
  while (i<100) {
    Logger.log( CacheService.getUserCache().get(key) )
    i++
  }
  Logger.log( Date.now()-t);
}

Answer 2

No way to do it like that. A better way to invalidate the cache is to store a version inside each cached object and keep the version in scriptProperties too. Whenever you read from the cache ignore it if its version is lower than your global version from scriptproperties. To invalidate the cache(s) simply increment your version from scriptProperties.