Relay based paging for Java graphql server in Java

I have implemented a Java - based graphql server using graphql - Java - tools Now I need to use my java - graphql server to implement relay - based paging

I can't find anything useful Who can help me point out the right place to find how in Java_ Implement relay based paging in graphql server?

Thank you for your expectation

Solution

Graphql java tools in version 5.4 Support for relay has been added to 0 As described in the documentation example, you can use the new @ connection directive in the schema:

type Query {
    users(first: Int,after: String): UserConnection @connection(for: "User")
}

type User {
    id: ID!
    name: String
}

And return a connection < T > in the parser:

class QueryResolver implements GraphQLQueryResolver {

  public Connection<User> users(int first,String after,DataFetchingEnvironment env) {
    return new SimpleListConnection<>(Collections.singletonList(new User(1L,"Luke"))).get(env);
  }
}

However, examples other than simple lists (for example, when edges must be extracted from the database) are scarce, and simplelistconnection is the only implementation provided by graphql Java so far