Support @Refreshable

[johndevs]

Feature description

I am generating the the GraphQL schema at runtime and I'd wish to update the schema when an external modification is made.

Preferably I'd like to use the @Refreshable annotation as that is what is used elsewhere and can easily be triggered via a REST end-point.

e.g

@Bean
@Refreshable
public GraphQL graphQL() {
...

}

Unfortunately this is not possible currently due to GraphQL missing a default constructor.

[johndevs]

As a work-around I was able to achieve it by using

@Bean
@Replaces(GraphQLInvocation.class)
@Refreshable
public GraphQLInvocation graphQLInvocation(GraphQL graphQL,
                                           GraphQLExecutionInputCustomizer graphQLExecutionInputCustomizer,
                                           @Nullable BeanProvider<DataLoaderRegistry> dataLoaderRegistry) {
        return new DefaultGraphQLInvocation(graphQL, graphQLExecutionInputCustomizer, dataLoaderRegistry);
}

[graemerocher]

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