nadel

GraphqL Java

License	MIT
Categories	Java Languages
GroupId	com.graphql-java
ArtifactId	nadel
Last Version	2021-03-26T09-09-21-fabd441
Release Date	Mar 26, 2021
Type	jar
Description	nadel GraphqL Java
Project URL	https://github.com/graphql-java/nadel
Source Code Management	https://github.com/graphql-java/nadel

Download nadel

Filename	Size
nadel-2021-03-26T09-09-21-fabd441.pom
nadel-2021-03-26T09-09-21-fabd441.jar	479 KB
nadel-2021-03-26T09-09-21-fabd441-sources.jar	186 KB
nadel-2021-03-26T09-09-21-fabd441-javadoc.jar	547 KB

How to add to project

Apache Maven

<!-- https://jarcasting.com/artifacts/com.graphql-java/nadel/ -->
<dependency>
    <groupId>com.graphql-java</groupId>
    <artifactId>nadel</artifactId>
    <version>2021-03-26T09-09-21-fabd441</version>
</dependency>

Gradle Groovy

// https://jarcasting.com/artifacts/com.graphql-java/nadel/
implementation 'com.graphql-java:nadel:2021-03-26T09-09-21-fabd441'

Gradle Kotlin

// https://jarcasting.com/artifacts/com.graphql-java/nadel/
implementation ("com.graphql-java:nadel:2021-03-26T09-09-21-fabd441")

Apache Buildr

'com.graphql-java:nadel:jar:2021-03-26T09-09-21-fabd441'

Apache Ivy

<dependency org="com.graphql-java" name="nadel" rev="2021-03-26T09-09-21-fabd441">
  <artifact name="nadel" type="jar" />
</dependency>

Groovy Grape

@Grapes(
@Grab(group='com.graphql-java', module='nadel', version='2021-03-26T09-09-21-fabd441')
)

Scala SBT

libraryDependencies += "com.graphql-java" % "nadel" % "2021-03-26T09-09-21-fabd441"

Leiningen

[com.graphql-java/nadel "2021-03-26T09-09-21-fabd441"]

Dependencies

compile (3)

Group / Artifact	Type	Version
com.graphql-java : graphql-java	jar	2021-03-22T20-02-28-3a701a0f
org.antlr : antlr4-runtime	jar	4.8
org.slf4j : slf4j-api	jar	1.7.25

Project Modules

There are no modules declared in this project.

Nadel: A distributed GraphQL engine

Nadel is a Java library to combine several graphql services together. This is achieved by combining several underlying GraphQL services (schemas) into one schema (overall schema).

The main purpose of this library is to power a GraphQL gateway which serves as the entry point for executing requests across different services while presenting one GraphQL API.

This is achieved by declaring the services, which should be combined, in a DSL which is build on top of the GraphQL SDL (Schema Definition Language).

While this library is in Java, the underlying services only need to provide a standard GraphQL API and no Java Code is required to combine services together. It is all done declarative as part of the DSL.

Example:

Lets assume we have two Services: "Issues" and "Users". One has Issues and one has Users. An Issue has a reference to its authors.

This is the schema for the Issues service:

type Query {
    issues: [Issue]
}
type Issue {
    id: ID
    authorIds: [ID]
}

And this is the Users service:

type Query {
    users(ids: [ID]): [User]
}
type User {
    id: ID
    fullName: String
}

This is how you would combine these two services together with Nadel while also renaming a field at the same time.

service Issues {
    type Query {
        issues: [Issue]
    }
    type Issue {
        id: ID
        authors: [User] => hydrated from Users.users(ids: $source.authorIds) object identified by id, batch size 10
    }
}

service Users {
    type Query {
        users(ids: [ID]): [User]
    }
    type User {
        id: ID
        name: String => renamed from fullName
    }
}

The result is a new GraphQL API which combines the two services in one and has the following schema:

type Query {
    issues: [Issue]
    users(ids: [ID]): [User]
}       
type Issue {
    id: ID
    authors: [User]
}
type User {
    id: ID
    name: String
}

Features

• Explicit overall schema design: every field for the overall schema needs to be declared in the Nadel DSL. If it is not declared it will not be exposed
• Hydration: resolving referencing to other objects by calling another service
• Field rename: renaming field from the underlying schema to a new name in the overall schema
• Type rename: renaming a type from the underlying schema to a new name in the overall schema
• Batching: Hydration calls are automatically batched with a configurable max batch size per call

Getting started

GraphQL Java

GraphQL server implementation for Java/JVM

Versions

Version
2021-03-26T09-09-21-fabd441 Mar 26, 2021
2021-03-25T23-15-58-fd2af49 Mar 26, 2021
2021-03-24T05-09-17-32b4efd Mar 24, 2021
2021-03-11T23-23-21-8e2f1e8 Mar 12, 2021
2021-03-11T23-22-56-9e9875d Mar 12, 2021
2021-03-11T00-42-24-6b4b7f0 Mar 11, 2021
2021-03-08T00-24-52-d7b4e67 Mar 8, 2021
2021-03-03T03-48-32-e3b54ce Mar 3, 2021
2021-02-24T06-02-24-3d89ebe Feb 24, 2021
2021-02-24T06-00-40-876b76e Feb 24, 2021
2021-02-22T23-09-43-4cedfe0 Feb 23, 2021
2021-02-21T22-18-28-449a102 Feb 22, 2021
2021-02-17T23-14-22-aa72db2 Feb 18, 2021
2021-02-17T05-28-35-7b40f0a Feb 17, 2021
2021-02-11T06-43-47-867230d Feb 11, 2021
2021-02-11T05-41-59-7ac10fe Feb 11, 2021
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