Use of cached objects in CloudScript?

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John Peterson asked Sep 29, '17

Use of cached objects in CloudScript?

Title ID: 44B1

Dear PlayFab community,

I am wondering how some of the Title-wide data management server API calls are managed. For example, the GetTitleData() or GetCatalogItems() will return relatively static data (in our case). Would it be worthwhile to cache this data with some sort of expiry? Or maybe the backing objects are already cached in some way (and refreshed when changes are made)? I had thought to potentially cache the data locally, and avoid the API call except to refresh.

Thoughts?

apis CloudScript

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Answer 1 · 2017-09-30T01:49:47Z

brendan answered Sep 30, '17

Yes, all title-level data is both sharded and cached, for efficiency. If you additionally want to cache that data for Cloud Script calls, there are two options:

1. Just add it into the script as static data. If it's a static value in the script, you don't even need to call GetTitleData.

2. Use a global cache to store the data. We spin up and down servers to manage your Cloud Script calls based upon usage. If you're checking a globally defined data store, you would only make the call to GetTitleData once after any given logic server spins up, saving time on all subsequent calls (though that first call will always have to be made).

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John Peterson commented · Sep 30, 2017 at 02:34 PM

Thanks, Brendan -- that's great to know! Do you happen to have any code examples of #2 handy (preferably in TypeScript) that I could copy?

0 ·

brendan John Peterson commented · Sep 30, 2017 at 11:11 PM

Sure, it could be something as simple as this:

function dataCache() {
  if( typeof dataCache.staticValue == 'undefined' ) {
    var request = {
      "Keys": [ "foo" ]
    };
    dataCache.staticValue = JSON.parse( server.GetTitleData( request ).Data[ "foo" ] );
  }
}


handlers.Test = function (args, context) {
  var data = dataCache();
};

If you put logging in before and after the dataCache() call, what you'll see is that when you're re-using the same engine that previously ran (and which hasn't shut down yet), the value of dataCache.staticValue is still there.

2 ·

John Peterson brendan commented · Oct 04, 2017 at 05:57 PM

Thanks, Brendan! Now I'm on the lookout for a simple in-memory cache that does a time-to-live so that I can quickly expire my entries while testing. ;-)

Surprisingly, that's hard to find in TypeScript. :-(

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