1. @devconfpl @VladimirD_42
REST API vs gRPC
Which One Should You Use
in Breaking a Monolith
Vladimir Dejanović
@VladimirD_42

2. @VladimirD_42
Vladimir Dejanović
Let’s Meet
@VladimirD_42
vladimir@itshark.xyz
http://itshark.xyz
@devconfpl

3. @VladimirD_42
Vladimir Dejanović
Let’s Meet
http://itshark.xyz
@devconfpl

4. @VladimirD_42
Vladimir Dejanović
Let’s Meet
@devconfpl

5. @VladimirD_42
Vladimir Dejanović
Let’s Meet
and Others...
@devconfpl

6. @VladimirD_42@devconfpl
Agenda

7. @VladimirD_42@devconfpl
Agenda
REST

8. @VladimirD_42@devconfpl
Agenda
gRPC
REST

9. @VladimirD_42@devconfpl
Agenda
gRPC
REST vs gRPC in breaking Monolith
REST

10. @VladimirD_42@devconfpl
Agenda
gRPC
Questions
REST vs gRPC in breaking Monolith
REST

11. @VladimirD_42@devconfpl
What is REST?

12. @VladimirD_42@devconfpl
REST

13. @VladimirD_42@devconfpl
REST
http://www.ics.uci.edu/~fielding/pubs/di
ssertation/rest_arch_style.htm

14. @VladimirD_42@devconfpl
REST
Client-Server Architecture

15. @VladimirD_42@devconfpl
REST
Statelessness
Client-Server Architecture

16. @VladimirD_42@devconfpl
REST
Cacheability
Statelessness
Client-Server Architecture

17. @VladimirD_42@devconfpl
REST
Cacheability
Layered System
Statelessness
Client-Server Architecture

18. @VladimirD_42@devconfpl
REST
Cacheability
Code on Demand (Optional)
Layered System
Statelessness
Client-Server Architecture

19. @VladimirD_42@devconfpl
REST
Cacheability
Code on Demand (Optional)
Layered System
Statelessness
Uniform Interface
Client-Server Architecture

20. @VladimirD_42@devconfpl
REST in Real Life

21. @VladimirD_42@devconfpl
REST in Real Life

22. @VladimirD_42@devconfpl
REST in Real Life

23. @VladimirD_42@devconfpl
REST in Real Life

24. @VladimirD_42@devconfpl
REST in Real Life
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
@RepositoryRestResource(collectionResourceRel = "people",
path = "people")
public interface PersonRepository
extends MongoRepository<Person, String> {
List<Person> findByLastName(@Param("name") String name);
}

25. @VladimirD_42@devconfpl
REST in Real Life
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
@RepositoryRestResource(collectionResourceRel = "people",
path = "people")
public interface PersonRepository
extends MongoRepository<Person, String> {
List<Person> findByLastName(@Param("name") String name);
}

26. @VladimirD_42@devconfpl
REST in Real Life
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
@RepositoryRestResource(collectionResourceRel = "people",
path = "people")
public interface PersonRepository
extends MongoRepository<Person, String> {
List<Person> findByLastName(@Param("name") String name);
}

27. @VladimirD_42@devconfpl
REST in Real Life
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
@RepositoryRestResource(collectionResourceRel = "people",
path = "people")
public interface PersonRepository
extends MongoRepository<Person, String> {
List<Person> findByLastName(@Param("name") String name);
}

28. @VladimirD_42@devconfpl
REST in Real Life
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.data.rest.core.annotation.RepositoryRestResource;
@RepositoryRestResource(collectionResourceRel = "people",
path = "people")
public interface PersonRepository
extends MongoRepository<Person, String> {
List<Person> findByLastName(@Param("name") String name);
}

29. @VladimirD_42@devconfpl

30. @VladimirD_42@devconfpl
What is gRPC?

31. @VladimirD_42@devconfpl
gRPC
gRPC Remote Procedure Call

32. @VladimirD_42@devconfpl
Remote Procedure Call

33. @VladimirD_42@devconfpl
Remote Procedure Call
RMI

34. @VladimirD_42@devconfpl
Remote Procedure Call
RMI
CORBA

35. @VladimirD_42@devconfpl
https://grpc.io/img/landing-2.svg

36. @VladimirD_42@devconfpl
https://grpc.io/img/landing-2.svg

37. @VladimirD_42@devconfpl
https://grpc.io/img/landing-2.svg

38. @VladimirD_42@devconfpl
https://grpc.io/img/landing-2.svg

39. @VladimirD_42@devconfpl
https://grpc.io/img/landing-2.svg

40. @VladimirD_42@devconfpl
gRPC
C++

41. @VladimirD_42@devconfpl
gRPC
C++ Java

42. @VladimirD_42@devconfpl
gRPC
C++ Java Python

43. @VladimirD_42@devconfpl
gRPC
C++ Java Python
Go

44. @VladimirD_42@devconfpl
gRPC
C++ Java Python
Go Ruby

45. @VladimirD_42@devconfpl
gRPC
C++ Java Python
Go Ruby C#

46. @VladimirD_42@devconfpl
gRPC
C++ Java Python
Go
Node.js
Ruby C#

47. @VladimirD_42@devconfpl
gRPC
C++ Java Python
Go
Node.js
Ruby C#
Android Java

48. @VladimirD_42@devconfpl
gRPC
C++ Java Python
Go
Node.js
Ruby C#
Objective-CAndroid Java

49. @VladimirD_42@devconfpl
gRPC
C++ Java Python
Go
Node.js
Ruby C#
Objective-CAndroid Java
PHP

50. @VladimirD_42@devconfpl
gRPC
C++ Java Python
Go
Node.js
Ruby C#
Objective-CAndroid Java
PHP Dart

51. @VladimirD_42@devconfpl
gRPC
C++ Java Python
Go
Node.js
Ruby C#
Objective-CAndroid Java
PHP Dart

52. @VladimirD_42@devconfpl
REST vs gRPC
in breaking Monolith

53. @VladimirD_42@devconfpl

54. @VladimirD_42@devconfpl

55. @VladimirD_42@devconfpl

56. @VladimirD_42@devconfpl
ref:http://assets.bonappetit.com/photos/57d32e45bd794aa9132639a4/master/w_625,c_limit/lernert-sander-cubes-crop2.jpg

57. @VladimirD_42@devconfpl
REST vs gRPC

58. @VladimirD_42@devconfpl
REST vs gRPC

59. @VladimirD_42@devconfpl
REST vs gRPC

60. @VladimirD_42@devconfpl
REST vs gRPC
Both support multiple Languages

61. @VladimirD_42@devconfpl
REST vs gRPC
Both support multiple Languages
REST support much more

62. @VladimirD_42@devconfpl

63. @VladimirD_42@devconfpl

64. @VladimirD_42@devconfpl
REST vs gRPC
https://grpc.io/

66. @VladimirD_42@devconfpl
REST vs gRPC
https://grpc.io/
https://github.com/grpc/grpc-java

67. @VladimirD_42@devconfpl
gRPC

68. @VladimirD_42@devconfpl
gRPC

69. @VladimirD_42@devconfpl
gRPC

70. @VladimirD_42@devconfpl
gRPC

71. @VladimirD_42@devconfpl
gRPC

72. @VladimirD_42@devconfpl
gRPC

73. @VladimirD_42@devconfpl
gRPC

74. @VladimirD_42@devconfpl
gRPC

75. @VladimirD_42@devconfpl
gRPC

76. @VladimirD_42@devconfpl
REST vs gRPC
REST support more than 4 types

77. @VladimirD_42@devconfpl
gRPC

78. @VladimirD_42@devconfpl
gRPC
IDL

79. @VladimirD_42@devconfpl
REST vs gRPC
Schema is “optional” in REST

80. @VladimirD_42@devconfpl
REST vs gRPC
Schema is “optional” in REST
REST code or schema first

81. @VladimirD_42@devconfpl
REST vs gRPC
Schema is “optional” in REST
REST code or schema first
gRPC is schema first

82. @VladimirD_42@devconfpl
...
message TransferMoney {
int32 trans_id = 1;
int32 from_account_number = 2;
int32 to_account_number = 3;
double ammount = 4;
string message = 5;
}
service Bank {
rpc Transfer(TransferMoney) returns (TransferConfirmation);
rpc ListenToNotifications(Account) returns (stream AccountNotification);
rpc RequestTransfer(stream RequestMoney) returns (stream RequestStatus);
}
...

83. @VladimirD_42@devconfpl
...
message TransferMoney {
int32 trans_id = 1;
int32 from_account_number = 2;
int32 to_account_number = 3;
double ammount = 4;
string message = 5;
}
service Bank {
rpc Transfer(TransferMoney) returns (TransferConfirmation);
rpc ListenToNotifications(Account) returns (stream AccountNotification);
rpc RequestTransfer(stream RequestMoney) returns (stream RequestStatus);
}
...

84. @VladimirD_42@devconfpl
...
message TransferMoney {
int32 trans_id = 1;
int32 from_account_number = 2;
int32 to_account_number = 3;
double ammount = 4;
string message = 5;
}
service Bank {
rpc Transfer(TransferMoney) returns (TransferConfirmation);
rpc ListenToNotifications(Account) returns (stream AccountNotification);
rpc RequestTransfer(stream RequestMoney) returns (stream RequestStatus);
}
...

85. @VladimirD_42@devconfpl
...
message TransferMoney {
int32 trans_id = 1;
int32 from_account_number = 2;
int32 to_account_number = 3;
double ammount = 4;
string message = 5;
}
service Bank {
rpc Transfer(TransferMoney) returns (TransferConfirmation);
rpc ListenToNotifications(Account) returns (stream AccountNotification);
rpc RequestTransfer(stream RequestMoney) returns (stream RequestStatus);
}
...

86. @VladimirD_42@devconfpl
...
message TransferMoney {
int32 trans_id = 1;
int32 from_account_number = 2;
int32 to_account_number = 3;
double ammount = 4;
string message = 5;
}
service Bank {
rpc Transfer(TransferMoney) returns (TransferConfirmation);
rpc ListenToNotifications(Account) returns (stream AccountNotification);
rpc RequestTransfer(stream RequestMoney) returns (stream RequestStatus);
}
...

87. @VladimirD_42@devconfpl
...
message TransferMoney {
int32 trans_id = 1;
int32 from_account_number = 2;
int32 to_account_number = 3;
double ammount = 4;
string message = 5;
}
service Bank {
rpc Transfer(TransferMoney) returns (TransferConfirmation);
rpc ListenToNotifications(Account) returns (stream AccountNotification);
rpc RequestTransfer(stream RequestMoney) returns (stream RequestStatus);
}
...

88. @VladimirD_42@devconfpl
...
message TransferMoney {
int32 trans_id = 1;
int32 from_account_number = 2;
int32 to_account_number = 3;
double ammount = 4;
string message = 5;
}
service Bank {
rpc Transfer(TransferMoney) returns (TransferConfirmation);
rpc ListenToNotifications(Account) returns (stream AccountNotification);
rpc RequestTransfer(stream RequestMoney) returns (stream RequestStatus);
}
...

89. @VladimirD_42@devconfpl
...
message TransferMoney {
int32 trans_id = 1;
int32 from_account_number = 2;
int32 to_account_number = 3;
double ammount = 4;
string message = 5;
}
service Bank {
rpc Transfer(TransferMoney) returns (TransferConfirmation);
rpc ListenToNotifications(Account) returns (stream AccountNotification);
rpc RequestTransfer(stream RequestMoney) returns (stream RequestStatus);
}
...

90. @VladimirD_42@devconfpl
...
message TransferMoney {
int32 trans_id = 1;
int32 from_account_number = 2;
int32 to_account_number = 3;
double ammount = 4;
string message = 5;
}
service Bank {
rpc Transfer(TransferMoney) returns (TransferConfirmation);
rpc ListenToNotifications(Account) returns (stream AccountNotification);
rpc RequestTransfer(stream RequestMoney) returns (stream RequestStatus);
}
...

91. @VladimirD_42@devconfpl
...
message TransferMoney {
int32 trans_id = 1;
int32 from_account_number = 2;
int32 to_account_number = 3;
double ammount = 4;
string message = 5;
}
service Bank {
rpc Transfer(TransferMoney) returns (TransferConfirmation);
rpc ListenToNotifications(Account) returns (stream AccountNotification);
rpc RequestTransfer(stream RequestMoney) returns (stream RequestStatus);
}
...

92. @VladimirD_42@devconfpl
...
message TransferMoney {
int32 trans_id = 1;
int32 from_account_number = 2;
int32 to_account_number = 3;
double ammount = 4;
string message = 5;
}
service Bank {
rpc Transfer(TransferMoney) returns (TransferConfirmation);
rpc ListenToNotifications(Account) returns (stream AccountNotification);
rpc RequestTransfer(stream RequestMoney) returns (stream RequestStatus);
}
...

93. @VladimirD_42@devconfpl
gRPC
IDL
HTTP/2

94. @VladimirD_42@devconfpl
REST vs gRPC
HTTP2 backed into gRPC

95. @VladimirD_42@devconfpl
REST vs gRPC
HTTP2 backed into gRPC
Extra work “needed” for REST

96. @VladimirD_42@devconfpl
gRPC
IDL
HTTP/2
Protobuf 3

97. @VladimirD_42@devconfpl
Protocol Buffers
http://itshark.xyz/posts/2018/7/11/P
rotocol_Buffers_basic_stuff_you_nee
d_to_know

98. @VladimirD_42@devconfpl
Protocol Buffers
https://www.youtube.com/watch?
v=oDIkgNchrVY

99. @VladimirD_42@devconfpl
REST vs gRPC
REST is not JSON over HTTP

100. @VladimirD_42@devconfpl
REST vs gRPC
JSON Proto

101. @VladimirD_42@devconfpl
REST vs gRPC
JSON Proto ProtoJSON

102. @VladimirD_42@devconfpl
REST vs gRPC
JSON Proto

103. @VladimirD_42@devconfpl
REST vs gRPC
JSON Proto ProtoJSON

104. @VladimirD_42@devconfpl
REST vs gRPC
Protocol Buffer with REST

105. @VladimirD_42@devconfpl
Big Difference

106. @VladimirD_42@devconfpl
Big Difference
REST is about Resources

107. @VladimirD_42@devconfpl
Big Difference
REST is about Resources
RPC is about Remote Procedure Calls

108. @VladimirD_42@devconfpl

109. @VladimirD_42@devconfpl

110. @VladimirD_42@devconfpl

111. @VladimirD_42@devconfpl

112. @VladimirD_42@devconfpl

113. @VladimirD_42@devconfpl

114. @VladimirD_42@devconfpl

115. @VladimirD_42@devconfpl

116. @VladimirD_42@devconfpl

117. @VladimirD_42@devconfpl

118. @VladimirD_42@devconfpl

119. @VladimirD_42@devconfpl

120. @VladimirD_42@devconfpl
gRPC code example
https://github.com/vladimir-dejanovic/g
rpc-bank-example

121. @VladimirD_42@devconfpl
REST vs gRPC

122. @VladimirD_42@devconfpl
REST vs gRPC

123. @VladimirD_42@devconfpl
REST vs gRPCWildWest

124. @VladimirD_42@devconfpl
REST vs gRPCWildWest
Law&Order

125. @VladimirD_42@devconfpl
REST vs gRPCWildWest
Law&Order
REST

126. @VladimirD_42@devconfpl
REST vs gRPCWildWest
Law&Order
REST

127. @VladimirD_42@devconfpl
REST vs gRPCWildWest
Law&Order
gRPCREST

128. @VladimirD_42@devconfpl
Some Questions

129. @VladimirD_42@devconfpl
Some Questions
Who will be consumers?

130. @VladimirD_42@devconfpl
Some Questions
Who will be consumers?
Mobile / Web / Other?

131. @VladimirD_42@devconfpl
Some Questions
What is the use case?

132. @VladimirD_42@devconfpl
Some Questions
What is the use case?
CRUD or Other?

133. @VladimirD_42@devconfpl
Some Questions
What are internal policies and rules?

134. @VladimirD_42@devconfpl
Some Questions
What are internal policies and rules?
Toward frameworks, protocols & others

135. @VladimirD_42@devconfpl
Some Questions
What is the problem
that you are solving?

136. @VladimirD_42@devconfpl
Thank You

137. @VladimirD_42@devconfpl
https://github.com/grpc/grpc-java
https://www.youtube.com/watch?v=oDIkgNchrVY
http://itshark.xyz/posts/2018/7/11/Protocol_Buffers_basic
_stuff_you_need_to_know
https://grpc.io/
https://github.com/vladimir-dejanovic/grpc-bank-example
http://www.ics.uci.edu/~fielding/pubs/dissertation
/rest_arch_style.htm

138. @VladimirD_42
Questions
@VladimirD_42
vladimir@itshark.xyz
http://itshark.xyz
@devconfpl