1class ServerChannelInterface: 

2 def read_json(self, spark, name): 

3 raise NotImplementedError() 

4 

5 

6 def has_json(self, spark, name): 

7 raise NotImplementedError() 

8 

9 

10 def write_json(self, spark, name, payload): 

11 raise NotImplementedError() 

12 

13 

14 def delete_json(self, spark, name): 

15 raise NotImplementedError() 

16 

17 

18class ClientChannelInterface: 

19 def read_json(self, name): 

20 raise NotImplementedError() 

21 

22 

23 def write_json(self, name, payload): 

24 raise NotImplementedError() 

25 

26 

27 def has_json(self, name): 

28 raise NotImplementedError() 

29 

30 

31 def delete_json(self, name): 

32 raise NotImplementedError()