Package org.allGraphQLCases.server

Interface DataFetchersDelegateHumanEdge

All Known Implementing Classes:

DataFetchersDelegateHumanEdgeImpl

public interface DataFetchersDelegateHumanEdge

This interface contains the fata fetchers that are delegated in the bean that the implementation has to provide, when fetching fields for the HumanEdge GraphQL type, as defined in the provided GraphQL schema. Please read the wiki server page for more information on this.

Author:

generated by graphql-java-generator

See Also:

• https://github.com/graphql-java-generator/graphql-java-generator

Method Summary

Modifier and Type	Method	Description
Object	node(graphql.schema.DataFetchingEnvironment dataFetchingEnvironment, org.dataloader.DataLoader<UUID,STP_Human_STS> dataLoader, STP_HumanEdge_STS origin)	This method loads the data for HumanEdge.node.

Method Details

node

Object node(graphql.schema.DataFetchingEnvironment dataFetchingEnvironment,
 org.dataloader.DataLoader<UUID,STP_Human_STS> dataLoader,
 STP_HumanEdge_STS origin)

This method loads the data for HumanEdge.node. It may return whatever is accepted by the Spring Controller, that is:

• A resolved value of any type (typically, a org.allGraphQLCases.server.STP_Human_STS)
• Mono and Flux for asynchronous value(s). Supported for controller methods and for any DataFetcher as described in Reactive DataFetcher. This would typically be a Mono<org.allGraphQLCases.server.STP_Human_STS> or a Flux<org.allGraphQLCases.server.STP_Human_STS>
• Kotlin coroutine and Flow are adapted to Mono and Flux
• java.util.concurrent.Callable to have the value(s) produced asynchronously. For this to work, AnnotatedControllerConfigurer must be configured with an Executor. This would typically by a Callable<org.allGraphQLCases.server.STP_Human_STS>

As a complement to the spring-graphql documentation, you may also return:

• A CompletableFuture<?>, for instance CompletableFuture<org.allGraphQLCases.server.STP_Human_STS>. This allows to use graphql-java java-dataloader to highly optimize the number of requests to the server. The principle is this one: The data loader collects all the data to load, avoid to load several times the same data, and allows parallel execution of the queries, if multiple queries are to be run.
• A Publisher (instead of a Flux), for Subscription for instance

Parameters:

dataFetchingEnvironment - The GraphQL DataFetchingEnvironment. It gives you access to the full GraphQL context for this DataFetcher

dataLoader - The DataLoader allows to load several data in one query. It allows to solve the (n+1) queries issues, and greatly optimizes the response time.
You'll find more informations here: https://github.com/graphql-java/java-dataloader

origin - The object from which the field is fetch. In other word: the aim of this data fetcher is to fetch the node attribute of the origin, which is an instance of {ObjectType {name:HumanEdge, fields:{Field{name:node, type:Human, params:[]},Field{name:cursor, type:String!, params:[]}}, comments ""}. It depends on your data modle, but it typically contains the id to use in the query.

Throws:

NoSuchElementException - This method may return a NoSuchElementException exception. In this case, the exception is trapped by the calling method, and the return is consider as null. This allows to use the Optional.get() method directly, without caring of whether or not there is a value. The generated code will take care of the NoSuchElementException exception.