#ask-questions
Title
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damp-toothbrush-94983
06/30/2023, 3:10 PMHello I am new with Growthbook. I wonder if GB SDK would keep to update the features status in my application, or my application needs to implement it?
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fresh-football-47124
06/30/2023, 3:11 PM
Hi Michael. What do you mean by “status”?
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damp-toothbrush-94983
06/30/2023, 3:17 PMMaybe refresh is better. I mean how our application get latest features' value, on/off
Does SDK have such function or GB service will send stream and let SDK keep the sync with GB server?
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fresh-football-47124
06/30/2023, 3:20 PM
what is the tech stack?
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damp-toothbrush-94983
06/30/2023, 3:23 PMin our app, we will call growthbook.loadFeatures() in App.js to get all features. I wonder how our app gets the latest status of these features?
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fresh-football-47124
06/30/2023, 3:24 PM
for JS, we do have real time updates with SSE
which you can enable
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damp-toothbrush-94983
06/30/2023, 3:25 PMduring create GrowthBook object?
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fresh-football-47124
06/30/2023, 3:28 PM
you have a single page app?
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damp-toothbrush-94983
06/30/2023, 3:30 PMno
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fresh-football-47124
06/30/2023, 3:30 PM
are you using GrowthBook client side or server side? (or both)
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damp-toothbrush-94983
06/30/2023, 3:34 PMboth, ui is react and backend is java
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fresh-football-47124
06/30/2023, 3:46 PM
okay, both those SDK languages support streaming updates
which will update realtime
you can DM me your SDK id and I can enable it for those endpoints if you want to test it out
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damp-toothbrush-94983
06/30/2023, 3:49 PMok, thanks!
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better-magician-65629
07/04/2023, 5:02 PMjava supports refreshing the features with a stale-while-revalidate approach. you can read more about that here, but essentially:
When you fetch features and they are considered stale, the stale features are returned from themethod and a network call to refresh the features is enqueued asynchronously. When that request succeeds, the features are updated with the newest features, and the next call togetFeaturesJson()will return the refreshed features.getFeaturesJson()
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damp-toothbrush-94983
07/06/2023, 12:19 PMGot it. Thanks
@better-magician-65629 dose reat have similar function?
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better-magician-65629
07/06/2023, 6:03 PMyes the react SDK uses the JS SDK. you can read the docs on auto-refreshing here for more info: https://docs.growthbook.io/lib/js#loading-features
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damp-toothbrush-94983
07/14/2023, 3:13 PM@better-magician-65629 and @fresh-football-47124 In java code, I should create GB object each time to get refreshed feature value?
in the above code example, each end point controller creates gb object with each call
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better-magician-65629
07/14/2023, 4:46 PMcreating a new GrowthBook instance for each request is recommended, and the GBFeaturesRepository (if you're using that) should be a singleton
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damp-toothbrush-94983
07/14/2023, 5:31 PMthanks
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better-magician-65629
07/14/2023, 6:39 PMi've also added another example that may help DRY up the request using a HandlerInterceptor, so you don't need to create it inline with every request. https://github.com/growthbook/examples/tree/main/jvm-spring-web#handlerinterceptor-implementation
also you asked about "refreshed feature value" – refreshing of features is handled in the GBFeaturesRepository. you can learn about the refreshing behaviour here: https://docs.growthbook.io/lib/java#fetching-cacheing-and-refreshing-features-with-gbfeaturesrepository
a new GrowthBook instance is recommended for each request so that there aren't race conditions between requests calling setAttributes and evaluating features on a single instance.
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