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LibrarySchemaModule.java
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LibrarySchemaModule.java
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// Copyright 2017 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.api.graphql.examples.library.graphqlserver;
import com.google.api.graphql.rejoiner.Arg;
import com.google.api.graphql.rejoiner.Mutation;
import com.google.api.graphql.rejoiner.SchemaModification;
import com.google.api.graphql.rejoiner.SchemaModule;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.example.library.book.v1.Book;
import com.google.example.library.book.v1.BookServiceGrpc;
import com.google.example.library.book.v1.CreateBookRequest;
import com.google.example.library.shelf.v1.GetShelfRequest;
import com.google.example.library.shelf.v1.Shelf;
import com.google.example.library.shelf.v1.ShelfServiceGrpc;
import net.javacrumbs.futureconverter.java8guava.FutureConverter;
import org.dataloader.DataLoaderRegistry;
import java.util.List;
/** A GraphQL {@link SchemaModule} backed by a gRPC service. */
final class LibrarySchemaModule extends SchemaModule {
@Mutation("createBookAndAddToShelf")
Book createBookAndAddToShelf(
CreateBookRequest request,
@Arg("shelf") GetShelfRequest shelfRequest,
ShelfServiceGrpc.ShelfServiceBlockingStub shelfClient,
BookServiceGrpc.BookServiceBlockingStub bookClient) {
Book book = bookClient.createBook(request);
Shelf shelf = shelfClient.getShelf(shelfRequest);
// TODO: Add an update shelf RPC
// shelfClient.updateShelf(shelf.toBuilder().addBookIds(book.getId()).build());
return book;
}
@SchemaModification(addField = "books", onType = Shelf.class)
ListenableFuture<List<Book>> shelfToBooks(Shelf shelf, DataLoaderRegistry dataLoaderRegistry) {
return FutureConverter.toListenableFuture(
dataLoaderRegistry.<String, Book>getDataLoader("books").loadMany(shelf.getBookIdsList()));
}
}