//...

function getData(request) {
  // ...

  var startDate = request.dateRange.startDate;
  var endDate = request.dateRange.endDate;

  var cache = new DataCache(CacheService.getUserCache(), startDate, endDate);
  var plays = null;
  plays = fetchFromCache(cache);
  if (!plays) {
    plays = fetchFromApi(startDate, endDate);
    setInCache(plays, cache);
  }

  return buildTabularData(plays, dataSchema);
}

function prepareSchema(request) {
  // Prepare the schema for the fields requested.
  var dataSchema = [];
  var fixedSchema = getSchema().schema;
  request.fields.forEach(function(field) {
    for (var i = 0; i < fixedSchema.length; i++) {
      if (fixedSchema[i].name == field.name) {
        dataSchema.push(fixedSchema[i]);
        break;
      }
    }
  });

  return dataSchema;
}

function fetchFromCache(cache) {
  var plays = null;
  console.log('Trying to fetch from cache...');
  try {
    var playsString = cache.get();
    plays = JSON.parse(playsString);
    console.log('Fetched succesfully from cache', plays.length);
  } catch (e) {
    console.log('Error when fetching from cache:', e);
  }

  return plays;
}

function setInCache(plays, cache) {
  console.log('Setting data to cache...');
  try {
    cache.set(JSON.stringify(plays));
  } catch (e) {
    console.log('Error when storing in cache', e);
  }
}