JraphQL

Java with GraphQL

Module	Description
jraphql-lang	GraphQL language representation
jraphql-runtime	GraphQL execution engine
jraphql-parser-antlr	Parser written in Antlr4 parse to jraphql-lang

Get Started

• Maven me.wener.jraphql

<dependency>
  <groupId>me.wener.jraphql</groupId>
  <artifactId>jraphql-runtimer</artifactId>
  <version>0.0.6</version>
</dependency>
<dependency>
  <groupId>me.wener.jraphql</groupId>
  <artifactId>jraphql-parser-antlr</artifactId>
  <version>0.0.6</version>
</dependency>

Features

Language representation

Feature	Description
Serializable	can parse or stringify to or from JSON
Immutable	friendly to cache or precompile
Buildable	every type has a builder for it generated by lombok.
Pluggable	language representation is not related to parser impl

Syntax Extension

Add extend by name syntax for object and interface

Weave multi schemas

# common.graphqls
scalar Version

# crm.graphqls
type CrmQuery {
  customer(id:ID!):Customer
  crmVersion: Version!
}
type CrmUser {
  customers: [Customer]
}
extend type Query by CrmQuery
extend type User by CrmUser

# erp.graphqls
type ErpQuery {
  product(id:ID!):Product
}
extend type Query by ErpQuery

Conditional schema

# Only admin can see and use these methods
type AdminMutation {
  changePassword(id:ID,password:String): ChangePasswordPayload
}
extend type Mutation by AdminMutation @Role(role:"admin")

Allowed directives on directive definition, add DIRECTIVE location

directive @JavaType(type:String) on DIRECTIVE
directive @Auth(value:String) @JavaType(type:"Auth") on FIELD_DEFINITION;

Allowed schema has optional name

schema Test {
  query: MyQuery
}

Runtime Extension

1. Type implements interface don't need to write the fields again.

interface Node {
    id: ID!
}

type User implements Node {
    # id: ID! # This is optional
}

2. Can disable introspection
   • new MetaResolver().setDisableIntrospection(true)

Embeddable Schema

JraphQL Runtime contain a embedded schema MetaSchema, generated by EmbededSchema.

• Parse Schema
• Serialize to JSON
• Best compress GZip
• Encode use mime base64
• Original JSON 32631 byte -> Encoded Base64 5352 byte

Example

StarWar

• StarWarApplication
  • SpringBoot WebFlux based
  • start and visite http://localhost:8080
• StarWarResolver
  • resolve the StarWar schema.

Queries you can try

mutation addRev {
  createReview(episode: EMPIRE, review: {stars: 4, commentary: "Ok Good"}) {
    stars
    commentary
  }
}

query rev($e:Episode = EMPIRE) {
  hero(episode: $e) {
    id
    name
    appearsIn
  }
  reviews(episode: $e) {
    stars
    commentary
  }
}

query search {
  search(text: "o") {
    __typename
    ... on Human {
      id
      name
    }
    ... on Droid {
      primaryFunction
    }
    ... on Starship {
      length
    }
  }
}

query baseQuery {
  starship(id: "3000") {
    id
    name
    length(unit: FOOT)
  }
  character(id: "2000") {
    id
    ... on Human {
      mass
      starships {
        name
      }
    }
    ... on Droid {
      name
      appearsIn
    }
  }
  human(id: "1003") {
    friendsConnection(after: "1002") {
      friends {
        name
      }
      pageInfo {
        hasNextPage
        startCursor
        endCursor
      }
    }
    friends {
      name
    }
  }
}

Work with GoaphQL

GoaphQL can generate code from schema that depends on jrapgql-api, can directly run on jraphql-graphql-java-adapter.

The generated code is static type and full featured, everything is an interface.