What does GraphQL and Traditional REST API have in common? Shouldn't the GraphQL be connected to some graphs or similar? What is actually GraphQL all about? Join me in this talk, while I try to answer all this questions and much more. In this talk I will explain what GraphQL is, what are differences and similarities compared to more traditional REST API and show you this on working examples, since code worth more then words only ;)

1. GraphQL
vs
Traditional REST API
Vladimir Dejanović
@VladimirD_42
amsterdamjug.com
ITShark.xyz
#DevoxxMA

2. #GraphQlVsRest
@VladimirD_42
Vladimir Dejanović
Let’s Meet

3. #GraphQlVsRest
@VladimirD_42
Vladimir Dejanović
Let’s Meet

4. #GraphQlVsRest
@VladimirD_42
Agenda

5. #GraphQlVsRest
@VladimirD_42
REST
Agenda

6. #GraphQlVsRest
@VladimirD_42
GraphQL
REST
Agenda

7. #GraphQlVsRest
@VladimirD_42
GraphQL
REST
Agenda
Questions

8. What is REST?
#GraphQlVsRest

9. #GraphQlVsRest
@VladimirD_42
REST

10. #GraphQlVsRest
@VladimirD_42
REST
Client-Server architecture

11. #GraphQlVsRest
@VladimirD_42
REST
Client-Server architecture
Statelessness

12. #GraphQlVsRest
@VladimirD_42
REST
Client-Server architecture
Statelessness
Cacheability

13. #GraphQlVsRest
@VladimirD_42
REST
Client-Server architecture
Statelessness
Cacheability
Layered system

14. #GraphQlVsRest
@VladimirD_42
REST
Client-Server architecture
Statelessness
Cacheability
Layered system
Code on Demand (Optional)

15. #GraphQlVsRest
@VladimirD_42
REST
Client-Server architecture
Statelessness
Cacheability
Layered system
Code on Demand (Optional)
Uniform Interface

16. #GraphQlVsRest
@VladimirD_42
REST
http://www.ics.uci.edu/~fielding/pubs/
dissertation/rest_arch_style.htm

17. #GraphQlVsRest
@VladimirD_42
Traditional REST API

18. #GraphQlVsRest
@VladimirD_42
Traditional REST API

19. #GraphQlVsRest
@VladimirD_42
Traditional REST API

20. #GraphQlVsRest
@VladimirD_42
Traditional REST API

21. #GraphQlVsRest
@VladimirD_42
Simple Blog

22. #GraphQlVsRest
@VladimirD_42
Simple Blog
Author
id
name

23. #GraphQlVsRest
@VladimirD_42
Simple Blog
Author
id
name
Post
id
title
body
authorId

24. #GraphQlVsRest
@VladimirD_42
Simple Blog
Author
id
name
Post
id
title
body
authorId
Comment
id
text
postId
authorId

25. #GraphQlVsRest
@VladimirD_42
Simple Blog

26. #GraphQlVsRest
@VladimirD_42
WARNING!!!!
Level of my real code is better ;)
This code was made intently for
demos, including errors and bad
code
Simple Blog

27. #GraphQlVsRest
@VladimirD_42
Let us Look at some code :D
Simple Blog

28. #GraphQlVsRest
@VladimirD_42
@Data
@Document(collection="authors")
public class Author {
@Id
private final String id;
private final String name;
}
Simple Blog

29. #GraphQlVsRest
@VladimirD_42
@Data
@Document(collection="authors")
public class Author {
@Id
private final String id;
private final String name;
}
Simple Blog

30. #GraphQlVsRest
@VladimirD_42
@Data
@Document(collection="authors")
public class Author {
@Id
private final String id;
private final String name;
}
Simple Blog

31. #GraphQlVsRest
@VladimirD_42
@Data
@Document(collection="authors")
public class Author {
@Id
private final String id;
private final String name;
}
Simple Blog

32. #GraphQlVsRest
@VladimirD_42
@Data
@Document(collection="authors")
public class Author {
@Id
private final String id;
private final String name;
}
Simple Blog

33. #GraphQlVsRest
@VladimirD_42
public interface AuthorRepository extends
MongoRepository<Author, String>
{}
Simple Blog

34. #GraphQlVsRest
@VladimirD_42
public interface AuthorRepository extends
MongoRepository<Author, String>
{}
Simple Blog

35. #GraphQlVsRest
@VladimirD_42
public interface AuthorRepository extends
MongoRepository<Author, String>
{}
Simple Blog

36. #GraphQlVsRest
@VladimirD_42
@RestControllerpublic
class SimpleRestController {
@Autowired
AuthorRepository authRepo;
@RequestMapping(path="/authors")
public List<Author> getAllAuthors() {
return authRepo.findAll(); }
@RequestMapping(path="/authors/{id}")
public Author getAuthorById(
@PathVariable String id) {
return authRepo.findOne(id);}
. . . . . .
Simple Blog

37. #GraphQlVsRest
@VladimirD_42
@RestControllerpublic
class SimpleRestController {
@Autowired
AuthorRepository authRepo;
@RequestMapping(path="/authors")
public List<Author> getAllAuthors() {
return authRepo.findAll(); }
@RequestMapping(path="/authors/{id}")
public Author getAuthorById(
@PathVariable String id) {
return authRepo.findOne(id);}
. . . . . .
Simple Blog

38. #GraphQlVsRest
@VladimirD_42
@RestControllerpublic
class SimpleRestController {
@Autowired
AuthorRepository authRepo;
@RequestMapping(path="/authors")
public List<Author> getAllAuthors() {
return authRepo.findAll(); }
@RequestMapping(path="/authors/{id}")
public Author getAuthorById(
@PathVariable String id) {
return authRepo.findOne(id);}
. . . . . .
Simple Blog

39. #GraphQlVsRest
@VladimirD_42
@RestControllerpublic
class SimpleRestController {
@Autowired
AuthorRepository authRepo;
@RequestMapping(path="/authors")
public List<Author> getAllAuthors() {
return authRepo.findAll(); }
@RequestMapping(path="/authors/{id}")
public Author getAuthorById(
@PathVariable String id) {
return authRepo.findOne(id);}
. . . . . .
Simple Blog

40. #GraphQlVsRest
@VladimirD_42
@RestControllerpublic
class SimpleRestController {
@Autowired
AuthorRepository authRepo;
@RequestMapping(path="/authors")
public List<Author> getAllAuthors() {
return authRepo.findAll(); }
@RequestMapping(path="/authors/{id}")
public Author getAuthorById(
@PathVariable String id) {
return authRepo.findOne(id);}
. . . . . .
Simple Blog

41. #GraphQlVsRest
@VladimirD_42
$ curl http://localhost:8080/authors | json_pp
[
{
"id" : "59f4c0f37718af0b1e001071",
"name" : "Ed Wong”
},
{
"id" : "59f4c1687718af0b1e001073",
"name" : "Son Goku”
}
]
Simple Blog

42. #GraphQlVsRest
@VladimirD_42
$ curl http://localhost:8080/authors | json_pp
[
{
"id" : "59f4c0f37718af0b1e001071",
"name" : "Ed Wong”
},
{
"id" : "59f4c1687718af0b1e001073",
"name" : "Son Goku”
}
]
Simple Blog

43. #GraphQlVsRest
@VladimirD_42
Code for Post and Comment similar
to code for Author
Simple Blog

44. #GraphQlVsRest
@VladimirD_42
$ curl http://localhost:8080/posts | json_pp
[
{
"body" : "Edward Wong Hau Pepelu Tivrusky IV
(エドワード・ウォン・ハウ・ペペル・チブルスキー4世 …………",
"title" : "Who is Ed Wong",
"authorId" : "59f4c0f37718af0b1e001071",
"id" : "59f4c12e7718af0b1e001072" },
. . . . . .
]
Simple Blog

45. #GraphQlVsRest
@VladimirD_42
$ curl http://localhost:8080/posts | json_pp
[
{
"body" : "Edward Wong Hau Pepelu Tivrusky IV
(エドワード・ウォン・ハウ・ペペル・チブルスキー4世 …………",
"title" : "Who is Ed Wong",
"authorId" : "59f4c0f37718af0b1e001071",
"id" : "59f4c12e7718af0b1e001072" },
. . . . . .
]
Simple Blog

46. #GraphQlVsRest
@VladimirD_42
$ curl http://localhost:8080/posts | json_pp
[
{
"body" : "Edward Wong Hau Pepelu Tivrusky IV
(エドワード・ウォン・ハウ・ペペル・チブルスキー4世 …………",
"title" : "Who is Ed Wong",
"authorId" : "59f4c0f37718af0b1e001071",
"id" : "59f4c12e7718af0b1e001072" },
. . . . . .
]
Simple Blog

47. #GraphQlVsRest
@VladimirD_42
$ curl
http://localhost:8080/authors/59f4c0f37718af0b1e0010
71 | json_pp
{
"name" : "Ed Wong",
"id" : "59f4c0f37718af0b1e001071”
}
Simple Blog

48. #GraphQlVsRest
@VladimirD_42
$ curl
http://localhost:8080/comments?post_id=59f4c12e7718a
f0b1e001072 | json_pp
[
{
"authorId" : "59f4c1687718af0b1e001073",
"text" : "you are great",
"id" : "59f4c3327718af0b1e001076",
"postId" : "59f4c12e7718af0b1e001072”
}
]
Simple Blog

49. #GraphQlVsRest
@VladimirD_42
Simple Blog
Simple REST API use case

50. #GraphQlVsRest
@VladimirD_42
Simple Blog
Simple REST API use case
‘‘Real enough’’

51. #GraphQlVsRest
@VladimirD_42
Simple Blog
Simple REST API use case
‘‘Real enough’’
Easy to extended, make complex

52. What is
GraphQL?
#GraphQlVsRest

53. #GraphQlVsRest
@VladimirD_42
GraphQL History

54. #GraphQlVsRest
@VladimirD_42
GraphQL History
Facebook internally 2012

55. #GraphQlVsRest
@VladimirD_42
GraphQL History
Public release 2015
Facebook internally 2012

56. #GraphQlVsRest
@VladimirD_42
GraphQL
GraphQL is a query language
for APIs

57. #GraphQlVsRest
@VladimirD_42
GraphQL
is
Specification

58. #GraphQlVsRest
@VladimirD_42
Talking is boring
Show us Code

59. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
type Author {
id: ID!
name: String!
}
type Post {
id: ID!
title: String!
body: String
authorId: String!
} . . . .
All Start with Schema

60. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
type Author {
id: ID!
name: String!
}
type Post {
id: ID!
title: String!
body: String
authorId: String!
} . . . .
All Start with Schema

61. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
type Author {
id: ID!
name: String!
}
type Post {
id: ID!
title: String!
body: String
authorId: String!
} . . . .
All Start with Schema

62. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
type Author {
id: ID!
name: String!
}
type Post {
id: ID!
title: String!
body: String
authorId: String!
} . . . .
All Start with Schema

63. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
type Author {
id: ID!
name: String!
}
type Post {
id: ID!
title: String!
body: String
authorId: String!
} . . . .
All Start with Schema

64. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
type Author {
id: ID!
name: String!
}
type Post {
id: ID!
title: String!
body: String
authorId: String!
} . . . .
All Start with Schema

65. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
type Author {
id: ID!
name: String!
}
type Post {
id: ID!
title: String!
body: String
authorId: String!
} . . . .
All Start with Schema

66. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
type Author {
id: ID!
name: String!
}
type Post {
id: ID!
title: String!
body: String
authorId: String!
} . . . .
All Start with Schema

67. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
type Author {
id: ID!
name: String!
}
type Post {
id: ID!
title: String!
body: String
authorId: String!
} . . . .
All Start with Schema

68. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
type Author {
id: ID!
name: String!
}
type Post {
id: ID!
title: String!
body: String
authorId: String!
} . . . .
All Start with Schema

69. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
type Comment {
id: ID!
authorId: String!
postId: String!
text: String
}
. . . .
All Start with Schema

70. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
}
type Query {
allPosts: [Post]
}
All Start with Schema

71. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
}
type Query {
allPosts: [Post]
}
All Start with Schema

72. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
}
type Query {
allPosts: [Post]
}
All Start with Schema

73. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
}
type Query {
allPosts: [Post]
}
All Start with Schema

74. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
}
type Query {
allPosts: [Post]
}
All Start with Schema

75. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
}
type Query {
allPosts: [Post]
}
All Start with Schema

76. #GraphQlVsRest
@VladimirD_42
Author, Post and Comment POJO are same
Repositories are same
Code

77. #GraphQlVsRest
@VladimirD_42
public class GraphQLEntryPoint extends
SimpleGraphQLServlet {
public
GraphQLEntryPoint(PostRepository p) {
super(buildSchema(p));
}
private static GraphQLSchema
buildSchema(PostRepository p) {
return SchemaParser.newParser()
.file("schema.graphqls")
.resolvers(new Query(postRepository))
.build().makeExecutableSchema();
}
}

78. #GraphQlVsRest
@VladimirD_42
public class GraphQLEntryPoint extends
SimpleGraphQLServlet {
public
GraphQLEntryPoint(PostRepository p) {
super(buildSchema(p));
}
private static GraphQLSchema
buildSchema(PostRepository p) {
return SchemaParser.newParser()
.file("schema.graphqls")
.resolvers(new Query(postRepository))
.build().makeExecutableSchema();
}
}

79. #GraphQlVsRest
@VladimirD_42
public class GraphQLEntryPoint extends
SimpleGraphQLServlet {
public
GraphQLEntryPoint(PostRepository p) {
super(buildSchema(p));
}
private static GraphQLSchema
buildSchema(PostRepository p) {
return SchemaParser.newParser()
.file("schema.graphqls")
.resolvers(new Query(postRepository))
.build().makeExecutableSchema();
}
}

80. #GraphQlVsRest
@VladimirD_42
public class GraphQLEntryPoint extends
SimpleGraphQLServlet {
public
GraphQLEntryPoint(PostRepository p) {
super(buildSchema(p));
}
private static GraphQLSchema
buildSchema(PostRepository p) {
return SchemaParser.newParser()
.file("schema.graphqls")
.resolvers(new Query(postRepository))
.build().makeExecutableSchema();
}
}

81. #GraphQlVsRest
@VladimirD_42
public class GraphQLEntryPoint extends
SimpleGraphQLServlet {
public
GraphQLEntryPoint(PostRepository p) {
super(buildSchema(p));
}
private static GraphQLSchema
buildSchema(PostRepository p) {
return SchemaParser.newParser()
.file("schema.graphqls")
.resolvers(new Query(postRepository))
.build().makeExecutableSchema();
}
}

82. #GraphQlVsRest
@VladimirD_42
public class GraphQLEntryPoint extends
SimpleGraphQLServlet {
public
GraphQLEntryPoint(PostRepository p) {
super(buildSchema(p));
}
private static GraphQLSchema
buildSchema(PostRepository p) {
return SchemaParser.newParser()
.file("schema.graphqls")
.resolvers(new Query(postRepository))
.build().makeExecutableSchema();
}
}

83. #GraphQlVsRest
@VladimirD_42
public class GraphQLEntryPoint extends
SimpleGraphQLServlet {
public
GraphQLEntryPoint(PostRepository p) {
super(buildSchema(p));
}
private static GraphQLSchema
buildSchema(PostRepository p) {
return SchemaParser.newParser()
.file("schema.graphqls")
.resolvers(new Query(postRepository))
.build().makeExecutableSchema();
}
}

84. #GraphQlVsRest
@VladimirD_42
public class GraphQLEntryPoint extends
SimpleGraphQLServlet {
public
GraphQLEntryPoint(PostRepository p) {
super(buildSchema(p));
}
private static GraphQLSchema
buildSchema(PostRepository p) {
return SchemaParser.newParser()
.file("schema.graphqls")
.resolvers(new Query(postRepository))
.build().makeExecutableSchema();
}
}

85. #GraphQlVsRest
@VladimirD_42
public class GraphQLEntryPoint extends
SimpleGraphQLServlet {
public
GraphQLEntryPoint(PostRepository p) {
super(buildSchema(p));
}
private static GraphQLSchema
buildSchema(PostRepository p) {
return SchemaParser.newParser()
.file("schema.graphqls")
.resolvers(new Query(postRepository))
.build().makeExecutableSchema();
}
}

86. #GraphQlVsRest
@VladimirD_42
@RequiredArgsConstructorpublic
class Query implements GraphQLRootResolver {
private final PostRepository postRepository;
public List<Post> allPosts() {
return postRepository.findAll();
}
}

87. #GraphQlVsRest
@VladimirD_42
@RequiredArgsConstructorpublic
class Query implements GraphQLRootResolver {
private final PostRepository postRepository;
public List<Post> allPosts() {
return postRepository.findAll();
}
}

88. #GraphQlVsRest
@VladimirD_42
@RequiredArgsConstructorpublic
class Query implements GraphQLRootResolver {
private final PostRepository postRepository;
public List<Post> allPosts() {
return postRepository.findAll();
}
}

89. #GraphQlVsRest
@VladimirD_42
@RequiredArgsConstructorpublic
class Query implements GraphQLRootResolver {
private final PostRepository postRepository;
public List<Post> allPosts() {
return postRepository.findAll();
}
}

90. #GraphQlVsRest
@VladimirD_42
Request
query {
allPosts {
authorId
id
title
body
}
}

91. #GraphQlVsRest
@VladimirD_42
Response
{
"data": {
"allPosts": [
{
"authorId": "59f4c0f37718af0b1e001071",
"id": "59f4c12e7718af0b1e001072",
"title": "Who is Ed Wong",
"body": "Edward Wong Hau Pepelu .....”
},
. . . .
}

92. #GraphQlVsRest
@VladimirD_42
Request
query {
allPosts {
authorId
title
}
}

93. #GraphQlVsRest
@VladimirD_42
Response
{
"data": {
"allPosts": [
{
"authorId": "59f4c0f37718af0b1e001071",
"title": "Who is Ed Wong",
},
. . . .
}

94. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . .
type Post {
id: ID!
title: String!
body: String
createdBy: Author!
} . . . .

95. #GraphQlVsRest
@VladimirD_42
private static GraphQLSchema
buildSchema(PostRepository postRepository,
AuthorRepository authRepository) {
return SchemaParser.newParser()
.file("schema.graphqls")
.resolvers(new Query(postRepository),
new PostResolver(authRepository))
.build().makeExecutableSchema();
}

96. #GraphQlVsRest
@VladimirD_42
@RequiredArgsConstructor
public class PostResolver implements
GraphQLResolver<Post> {
private final AuthorRepository authRepository;
public Author createdBy(Post post) {
return
authRepository
.findOne(post.getAuthorId());
}
}

97. #GraphQlVsRest
@VladimirD_42
@RequiredArgsConstructor
public class PostResolver implements
GraphQLResolver<Post> {
private final AuthorRepository authRepository;
public Author createdBy(Post post) {
return
authRepository
.findOne(post.getAuthorId());
}
}

98. #GraphQlVsRest
@VladimirD_42
@RequiredArgsConstructor
public class PostResolver implements
GraphQLResolver<Post> {
private final AuthorRepository authRepository;
public Author createdBy(Post post) {
return
authRepository
.findOne(post.getAuthorId());
}
}

99. #GraphQlVsRest
@VladimirD_42
@RequiredArgsConstructor
public class PostResolver implements
GraphQLResolver<Post> {
private final AuthorRepository authRepository;
public Author createdBy(Post post) {
return
authRepository
.findOne(post.getAuthorId());
}
}

100. #GraphQlVsRest
@VladimirD_42
@RequiredArgsConstructor
public class PostResolver implements
GraphQLResolver<Post> {
private final AuthorRepository authRepository;
public Author createdBy(Post post) {
return
authRepository
.findOne(post.getAuthorId());
}
}

101. #GraphQlVsRest
@VladimirD_42
@RequiredArgsConstructor
public class PostResolver implements
GraphQLResolver<Post> {
private final AuthorRepository authRepository;
public Author createdBy(Post post) {
return
authRepository
.findOne(post.getAuthorId());
}
}

102. #GraphQlVsRest
@VladimirD_42
Request
{
query {
allPosts {
title
createdBy {
name
}
}
}
}

103. #GraphQlVsRest
@VladimirD_42
Request
{
query {
allPosts {
title
createdBy {
name
}
}
}
}

104. #GraphQlVsRest
@VladimirD_42
Response
{
"data": {
"allPosts": [
{
"title": "Who is Ed Wong",
"createdBy": {
"name": "Ed Wong”
}
},
. . .
]
}

105. #GraphQlVsRest
@VladimirD_42
type Author {
id: ID!
name: String!
posts: [Post]
}
type Post {
id: ID!
title: String!
body: String
createdBy: Author!
comments: [Comment]
}

106. #GraphQlVsRest
@VladimirD_42
type Author {
id: ID!
name: String!
posts: [Post]
}
type Post {
id: ID!
title: String!
body: String
createdBy: Author!
comments: [Comment]
}

107. #GraphQlVsRest
@VladimirD_42
type Author {
id: ID!
name: String!
posts: [Post]
}
type Post {
id: ID!
title: String!
body: String
createdBy: Author!
comments: [Comment]
}

108. #GraphQlVsRest
@VladimirD_42
type Author {
id: ID!
name: String!
posts: [Post]
}
type Post {
id: ID!
title: String!
body: String
createdBy: Author!
comments: [Comment]
}

109. #GraphQlVsRest
@VladimirD_42
type Author {
id: ID!
name: String!
posts: [Post]
}
type Post {
id: ID!
title: String!
body: String
createdBy: Author!
comments: [Comment]
}

110. #GraphQlVsRest
@VladimirD_42
type Author {
id: ID!
name: String!
posts: [Post]
}
type Post {
id: ID!
title: String!
body: String
createdBy: Author!
comments: [Comment]
}

111. #GraphQlVsRest
@VladimirD_42
type Comment {
id: ID!
createdBy: Author!
belongsTo: Post!
text: String
}

112. #GraphQlVsRest
@VladimirD_42
type Comment {
id: ID!
createdBy: Author!
belongsTo: Post!
text: String
}

113. #GraphQlVsRest
@VladimirD_42
type Comment {
id: ID!
createdBy: Author!
belongsTo: Post!
text: String
}

114. #GraphQlVsRest
@VladimirD_42
type Comment {
id: ID!
createdBy: Author!
belongsTo: Post!
text: String
}

115. #GraphQlVsRest
@VladimirD_42
type Comment {
id: ID!
createdBy: Author!
belongsTo: Post!
text: String
}

116. #GraphQlVsRest
@VladimirD_42
Request
query {
allPosts {
title
comments {
text
createdBy {
name
posts {
title
comments {
text
. . . .

117. #GraphQlVsRest
@VladimirD_42
Request
query {
allPosts {
title
comments {
text
createdBy {
name
posts {
title
comments {
text
. . . .

118. #GraphQlVsRest
@VladimirD_42
Protect from Abuse

119. #GraphQlVsRest
@VladimirD_42
Protect from Abuse
Time out

120. #GraphQlVsRest
@VladimirD_42
Protect from Abuse
Time out
Max Query Depth

121. #GraphQlVsRest
@VladimirD_42
Protect from Abuse
Time out
Max Query Depth
Max Query Complexity

122. #GraphQlVsRest
@VladimirD_42
Protect from Abuse
Time out
Max Query Depth
Max Query Complexity
Throttling

123. #GraphQlVsRest
@VladimirD_42
Mutation

124. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

125. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

126. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

127. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

128. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

129. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

130. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

131. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

132. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

133. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

134. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

135. #GraphQlVsRest
@VladimirD_42
$ cat src/main/resources/schema.graphqls
. . . .
schema {
query: Query
mutation: Mutation
}
type Mutation {
addAuthor(name: String!) : Author
removeAuthour(id: ID!): Author
}
. . . .

136. #GraphQlVsRest
@VladimirD_42
private static GraphQLSchema
buildSchema(PostRepository pr,
AuthorRepository ar,
CommentRepository cr) {
return SchemaParser
.newParser().file("schema.graphqls")
.resolvers(
new Query(pr,ar),
new Mutation(ar),
new PostResolver(ar,cr),
new AuthorResolver(pr),
new CommentResolver(ar,pr))
.build().makeExecutableSchema();
}

137. #GraphQlVsRest
@VladimirD_42
private static GraphQLSchema
buildSchema(PostRepository pr,
AuthorRepository ar,
CommentRepository cr) {
return SchemaParser
.newParser().file("schema.graphqls")
.resolvers(
new Query(pr,ar),
new Mutation(ar),
new PostResolver(ar,cr),
new AuthorResolver(pr),
new CommentResolver(ar,pr))
.build().makeExecutableSchema();
}

138. #GraphQlVsRest
@VladimirD_42
private static GraphQLSchema
buildSchema(PostRepository pr,
AuthorRepository ar,
CommentRepository cr) {
return SchemaParser
.newParser().file("schema.graphqls")
.resolvers(
new Query(pr,ar),
new Mutation(ar),
new PostResolver(ar,cr),
new AuthorResolver(pr),
new CommentResolver(ar,pr))
.build().makeExecutableSchema();
}

139. #GraphQlVsRest
@VladimirD_42
private static GraphQLSchema
buildSchema(PostRepository pr,
AuthorRepository ar,
CommentRepository cr) {
return SchemaParser
.newParser().file("schema.graphqls")
.resolvers(
new Query(pr,ar),
new Mutation(ar),
new PostResolver(ar,cr),
new AuthorResolver(pr),
new CommentResolver(ar,pr))
.build().makeExecutableSchema();
}

140. #GraphQlVsRest
@VladimirD_42
public class Mutation
implements GraphQLRootResolver {
private final AuthorRepository authRepo;
public Author addAuthor(String name) {
return authRepo.save(new Author(null, name));
}
public Author removeAuthour(String id) {
Author auth = authRepo.findOne(id);
authRepo.delete(id); return auth;
}
}

141. #GraphQlVsRest
@VladimirD_42
public class Mutation
implements GraphQLRootResolver {
private final AuthorRepository authRepo;
public Author addAuthor(String name) {
return authRepo.save(new Author(null, name));
}
public Author removeAuthour(String id) {
Author auth = authRepo.findOne(id);
authRepo.delete(id); return auth;
}
}

142. #GraphQlVsRest
@VladimirD_42
public class Mutation
implements GraphQLRootResolver {
private final AuthorRepository authRepo;
public Author addAuthor(String name) {
return authRepo.save(new Author(null, name));
}
public Author removeAuthour(String id) {
Author auth = authRepo.findOne(id);
authRepo.delete(id); return auth;
}
}

143. #GraphQlVsRest
@VladimirD_42
public class Mutation
implements GraphQLRootResolver {
private final AuthorRepository authRepo;
public Author addAuthor(String name) {
return authRepo.save(new Author(null, name));
}
public Author removeAuthour(String id) {
Author auth = authRepo.findOne(id);
authRepo.delete(id); return auth;
}
}

144. #GraphQlVsRest
@VladimirD_42
public class Mutation
implements GraphQLRootResolver {
private final AuthorRepository authRepo;
public Author addAuthor(String name) {
return authRepo.save(new Author(null, name));
}
public Author removeAuthour(String id) {
Author auth = authRepo.findOne(id);
authRepo.delete(id); return auth;
}
}

145. #GraphQlVsRest
@VladimirD_42
public class Mutation
implements GraphQLRootResolver {
private final AuthorRepository authRepo;
public Author addAuthor(String name) {
return authRepo.save(new Author(null, name));
}
public Author removeAuthour(String id) {
Author auth = authRepo.findOne(id);
authRepo.delete(id); return auth;
}
}

146. #GraphQlVsRest
@VladimirD_42
public class Mutation
implements GraphQLRootResolver {
private final AuthorRepository authRepo;
public Author addAuthor(String name) {
return authRepo.save(new Author(null, name));
}
public Author removeAuthour(String id) {
Author auth = authRepo.findOne(id);
authRepo.delete(id); return auth;
}
}

147. #GraphQlVsRest
@VladimirD_42
public class Mutation
implements GraphQLRootResolver {
private final AuthorRepository authRepo;
public Author addAuthor(String name) {
return authRepo.save(new Author(null, name));
}
public Author removeAuthour(String id) {
Author auth = authRepo.findOne(id);
authRepo.delete(id); return auth;
}
}

148. #GraphQlVsRest
@VladimirD_42
public class Mutation
implements GraphQLRootResolver {
private final AuthorRepository authRepo;
public Author addAuthor(String name) {
return authRepo.save(new Author(null, name));
}
public Author removeAuthour(String id) {
Author auth = authRepo.findOne(id);
authRepo.delete(id); return auth;
}
}

149. #GraphQlVsRest
@VladimirD_42
public class Mutation
implements GraphQLRootResolver {
private final AuthorRepository authRepo;
public Author addAuthor(String name) {
return authRepo.save(new Author(null, name));
}
public Author removeAuthour(String id) {
Author auth = authRepo.findOne(id);
authRepo.delete(id); return auth;
}
}

150. #GraphQlVsRest
@VladimirD_42
Request
mutation {
addAuthor (name: " Gon Freecss") {
name
}
}

151. #GraphQlVsRest
@VladimirD_42
Response
{
"data": {
"addAuthor": {
"name": " Gon Freecss”
}
}
}

152. #GraphQlVsRest
@VladimirD_42
Subscription

153. #GraphQlVsRest
@VladimirD_42
Subscription
Realtime Updates

154. #GraphQlVsRest
@VladimirD_42
Subscription
Realtime Updates
Not supported by all implementations

155. #GraphQlVsRest
@VladimirD_42
Caching

156. #GraphQlVsRest
@VladimirD_42
Caching
Different approach
Is needed

157. #GraphQlVsRest
@VladimirD_42
Paramaters

158. #GraphQlVsRest
@VladimirD_42
Paramaters
Like in Mutation

159. #GraphQlVsRest
@VladimirD_42
Headers/Cookies

160. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

161. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

162. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

163. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

164. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

165. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

166. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

167. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

168. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

169. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

170. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

171. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

172. #GraphQlVsRest
@VladimirD_42
class MyCustomContext extends GraphQLContext
. . . .
@Override
protected GraphQLContext
createContext(Optional<HttpServletRequest> r,
Optional<HttpServletResponse> response) {
. . . .
return MyCustomContext
}
. . . .
public ? <method>(<args>,
DataFetchingEnvironment env) {
MyCustomContext con = env.getContext();
. . . .

173. #GraphQlVsRest
@VladimirD_42
Authentication

174. #GraphQlVsRest
@VladimirD_42
Authentication
Over custom Context

175. Conclusion
#GraphQlVsRest

176. #GraphQlVsRest
@VladimirD_42
GraphQL
Client-Server architecture
Statelessness
Cacheability
Layered system
Code on Demand (Optional)
Uniform Interface

177. #GraphQlVsRest
@VladimirD_42
GraphQL
Client-Server architecture
Statelessness
Cacheability
Layered system
Code on Demand (Optional)
Uniform Interface

178. #GraphQlVsRest
@VladimirD_42
GraphQL
Client-Server architecture
Statelessness
Cacheability
Layered system
Code on Demand (Optional)
Uniform Interface

179. #GraphQlVsRest
@VladimirD_42
GraphQL
Client-Server architecture
Statelessness
Cacheability
Layered system
Code on Demand (Optional)
Uniform Interface

180. #GraphQlVsRest
@VladimirD_42
GraphQL
Client-Server architecture
Statelessness
Cacheability
Layered system
Code on Demand (Optional)
Uniform Interface

181. #GraphQlVsRest
@VladimirD_42
GraphQL
Client-Server architecture
Statelessness
Cacheability
Layered system
Code on Demand (Optional)
Uniform Interface

182. #GraphQlVsRest
@VladimirD_42
GraphQL
Client-Server architecture
Statelessness
Cacheability
Layered system
Code on Demand (Optional)
Uniform Interface

183. #GraphQlVsRest
@VladimirD_42
$ curl -H "Content-Type: application/json" -X POST
-d '{"query":"query {allPosts { title }}",
"variables":null}' http://localhost:8080/graphql |
json_pp
{
"data" : {
"allPosts" : [
{
"title" : "Who is Ed Wong”
}, {
"title" : "Who is Son Goku”
},
. . . .

184. #GraphQlVsRest
@VladimirD_42
$ curl -H "Content-Type: application/json" -X POST
-d '{"query":"query {allPosts { title }}",
"variables":null}' http://localhost:8080/graphql |
json_pp
{
"data" : {
"allPosts" : [
{
"title" : "Who is Ed Wong”
}, {
"title" : "Who is Son Goku”
},
. . . .

185. #GraphQlVsRest
@VladimirD_42
$ curl -H "Content-Type: application/json" -X POST
-d '{"query":"query {allPosts { title }}",
"variables":null}' http://localhost:8080/graphql |
json_pp
{
"data" : {
"allPosts" : [
{
"title" : "Who is Ed Wong”
}, {
"title" : "Who is Son Goku”
},
. . . .

186. #GraphQlVsRest
@VladimirD_42
$ curl -H "Content-Type: application/json" -X POST
-d '{"query":"query {allPosts { title }}",
"variables":null}' http://localhost:8080/graphql |
json_pp
{
"data" : {
"allPosts" : [
{
"title" : "Who is Ed Wong”
}, {
"title" : "Who is Son Goku”
},
. . . .

187. #GraphQlVsRest
@VladimirD_42
$ curl -H "Content-Type: application/json" -X POST
-d '{"query":"query {allPosts { title }}",
"variables":null}' http://localhost:8080/graphql |
json_pp
{
"data" : {
"allPosts" : [
{
"title" : "Who is Ed Wong”
}, {
"title" : "Who is Son Goku”
},
. . . .

188. #GraphQlVsRest
@VladimirD_42
$ curl -H "Content-Type: application/json" -X POST
-d '{"query":"query {allPosts { title }}",
"variables":null}' http://localhost:8080/graphql |
json_pp
{
"data" : {
"allPosts" : [
{
"title" : "Who is Ed Wong”
}, {
"title" : "Who is Son Goku”
},
. . . .

189. #GraphQlVsRest
@VladimirD_42
$ curl -H "Content-Type: application/json" -X POST
-d '{"query":"query {allPosts { title }}",
"variables":null}' http://localhost:8080/graphql |
json_pp
{
"data" : {
"allPosts" : [
{
"title" : "Who is Ed Wong”
}, {
"title" : "Who is Son Goku”
},
. . . .

190. #GraphQlVsRest
@VladimirD_42
$ curl -H "Content-Type: application/json" -X POST
-d '{"query":"query {allPosts { title }}",
"variables":null}' http://localhost:8080/graphql |
json_pp
{
"data" : {
"allPosts" : [
{
"title" : "Who is Ed Wong”
}, {
"title" : "Who is Son Goku”
},
. . . .

191. #GraphQlVsRest
@VladimirD_42
$ curl -H "Content-Type: application/json" -X POST
-d '{"query":"query {allPosts { title }}",
"variables":null}' http://localhost:8080/graphql |
json_pp
{
"data" : {
"allPosts" : [
{
"title" : "Who is Ed Wong”
}, {
"title" : "Who is Son Goku”
},
. . . .

192. #GraphQlVsRest
@VladimirD_42
SOA and WSDL?

193. #GraphQlVsRest
@VladimirD_42
https://neurocapability.files.wordpress.com/2012/08/businessman-asleep-meeting-istock.jpg

194. #GraphQlVsRest
@VladimirD_42

195. #GraphQlVsRest
@VladimirD_42
HAL

196. #GraphQlVsRest
@VladimirD_42
HAL
Adopting HAL will make your API
explorable, and its documentation
easily discoverable from within the
API itself.

197. #GraphQlVsRest
@VladimirD_42
Code Examples
https://github.com/vladimir-dejanovic/simple-sp
ringboot-rest-mongo-conftalk-demo
https://github.com/vladimir-dejanovic/simple-sp
ringboot-graphql-mongo-conftalk-demo

198. Thank You
#GraphQlVsRest

199. #GraphQlVsRest
@VladimirD_42
Questions
@VladimirD_42
ed.wong.iv@gmail.com