CODEWITHSUNDEEP
androidkotlincachinggoogle-cloud-firestorelistener
dannad
dannad

Reputation: 83

manually set Firebase Firestore cache

I am looking for a solution for my problem, i have a chat app which displays all the users correspondence as a Recyclerview a listener, in-order to improve user experience when a user send a message i manually update the Recyclerview with the current list plus the new message with an "uploading indication" then when the message actually uploads to Firebase the listener overrides the local list i used and updates the last message to "uploaded", problem is if i rebuild the activity the listener automatically update the Recyclerview's list to the one cached therefore the user cannot see his "uploading" message any more until it hits the server. is was thinking if there is a manually way i can set the listener's cache to the local list without waiting for it to upload? if not maybe there is a better solution i hadn't thought about? (i have many different chats with many different users so i need to be able to fetch every chat channels own unique list)

uploading message only local and uncached

and uploaded message as overwritten by listener

Upvotes: 1

Views: 599

Answers (1)

Alex Mamo
Alex Mamo

Reputation: 138824

There is an option in which you can force a query to retrieve data only from the cache. If this is what you need, you can achieve this with the help of the DocumentReference.get(Source source) and Query.get(Source source) methods.

By default, get() attempts to provide up-to-date data when possible by waiting for data from the server, but it may return cached data or fail if you are offline and the server cannot be reached. This behavior can be altered via the Source parameter.

So you can pass as an argument to the DocumentReference or to the Query the source so we can force the retrieval of data from the server only, chache only or attempt server and fall back to the cache.

So something like this will do the trick:

FirebaseFirestore db = FirebaseFirestore.getInstance();
DocumentReference docIdRef = db.collection("tests").document("fOpCiqmUjAzjnZimjd5c");
docIdRef.get(Source.CACHE).addOnSuccessListener(new OnSuccessListener<DocumentSnapshot>() {
    @Override
    public void onSuccess(DocumentSnapshot documentSnapshot) {
        //Get data from the documentSnapshot object
    }
});

In this case, we force the data to be retrieved from the cache only. If you want to force the data to be retrieved from the server only, you should pass as an argument to the get() method, Source.SERVER. More informations here.

Upvotes: 1

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