I'm using Android-Java and Firestore. I want to run multiple batched writes asynchronously so that if 1 batch write fails, all write batches must also fail. This is what I did,

btn_batch.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            CollectionReference facultyRef = db.collection("Faculty");
            List<WriteBatch> writeBatches = new ArrayList<>();
            writeBatches.add(db.batch());
            int counter = 0, batchIndex = 0;

            for(int i=1; i<=10000; i  ){
                String username = "user" i;
                String password = UUID.randomUUID().toString().substring(0, 7);
                User user = new User(username, password);

                writeBatches.get(batchIndex).set(facultyRef.document(), user);
                counter  ;

                if(counter == 499){
                    writeBatches.add(db.batch());
                    counter = 0;
                    batchIndex  ;
                }
            }

            commitBatches(writeBatches);
        }
    });

private void commitBatches(List<WriteBatch> writeBatches){
    if(writeBatches.size() > 0){
        WriteBatch writeBatch = writeBatches.get(0);
        writeBatch.commit()
                .addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull @NotNull Task<Void> task) {
                        if(task.isSuccessful()){
                            writeBatches.remove(0);
                            commitBatches(writeBatches);
                        }else{
                            Toast.makeText(MainActivity.this, task.getException().getMessage(), Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }else{
        Toast.makeText(this, "Batched Write Success", Toast.LENGTH_SHORT).show();
    }
}

My problem is that this code is not asynchronous therefore this code performs very slow and not reliable. Is there any way to run this code asynchronously? Please help me.

CodePudding user response：

The batch operation is by definition atomic. This means that all operations succeed, or none of them are applied.

As I understand from your question, you need a batch of batches, which is actually not possible. If you have 500 operations in a batch and another 500 operations in another batch, those operations are considered atomic but separately. You cannot merge 1.000 operations in a single batch.