Hello, I'm working on a squad system and I need to know when a friend has invited me... Is it ok on mobile performance wise and PlayFab wise to call
PlayFabClientAPI.GetFriendsList
every second? How often would you recommend to call it if I need fairly instant alert when friend invites me?
I would recommend only doing this every few minutes. Please bear in mind that all use of PlayFab is usage-based, and returned data from calls like GetFriendsList hit the Profile Read meter at a rate of 1 per 1 KB in the response data. So every time you make this call, you'll be adding N to the Profile Read meter, depending on how many friends the player has and how much additional information you are pulling from the profile in that query.
What you really want is a PubSub (publish/subscribe) system, so that clients can "listen" for events when they occur. We do plan to offer a PubSub service in the future (we do not have a specific date for this yet), but we have a sample showing how you could implement a system like this today here: PlayFab-Samples/Samples/CSharp/MessagingClient at master PlayFab/PlayFab-Samples (github.com)
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