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graphql-dgs-spring-graphql-example-java
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/*
* Copyright 2024 Netflix, Inc.
*
* 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.netflix.graphql.dgs.example.datafetcher;
import graphql.schema.DataFetchingEnvironment;
import org.dataloader.DataLoader;
import org.dataloader.DataLoaderRegistry;
import org.springframework.graphql.data.method.annotation.Argument;
import org.springframework.graphql.data.method.annotation.QueryMapping;
import org.springframework.graphql.execution.BatchLoaderRegistry;
import org.springframework.stereotype.Controller;
import reactor.core.publisher.Mono;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
@Controller
public class GreetingBatchLoader {
public GreetingBatchLoader(BatchLoaderRegistry registry) {
registry.forTypePair(Person.class, String.class).registerMappedBatchLoader((persons, env) -> {
Map result = new HashMap<>();
persons.forEach(it -> result.put(it, "greetings " + it.getName()));
return Mono.just(result);
});
}
@QueryMapping
public CompletableFuture greetingFromBatchLoader(@Argument Person person, DataLoader loader, DataFetchingEnvironment env) {
DataLoaderRegistry registry = env.getDataLoaderRegistry();
CompletableFuture result = loader.load(person);
loader.dispatch();
return result;
}
}
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