Java/Firestore -在循环到下一项之前等待读取数据(异步)

import com.google.api.core.ApiFuture;
import com.google.cloud.firestore.DocumentSnapshot;
import com.google.cloud.firestore.Firestore;
import com.google.cloud.firestore.Query;
import com.google.cloud.firestore.QueryDocumentSnapshot;
import com.google.cloud.firestore.QuerySnapshot;
import com.google.cloud.firestore.FirestoreOptions;

import java.util.List;
import java.util.concurrent.ExecutionException;

public class FirestoreExample {
    private static final String COLLECTION_NAME = "your_collection_name";

    public static void main(String[] args) {
        Firestore firestore = FirestoreOptions.getDefaultInstance().getService();
        Query query = firestore.collection(COLLECTION_NAME);

        try {
            ApiFuture<QuerySnapshot> querySnapshot = query.get();
            List<QueryDocumentSnapshot> documents = querySnapshot.get().getDocuments();

            for (QueryDocumentSnapshot document : documents) {
                // 处理每一项数据
                // 读取数据的操作

                // 等待读取数据完成
                ApiFuture<DocumentSnapshot> documentSnapshot = document.getReference().get();
                DocumentSnapshot snapshot = documentSnapshot.get();

                // 继续处理数据
                // ...
            }
        } catch (InterruptedException | ExecutionException e) {
            e.printStackTrace();
        }
    }
}