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Refactor auto-registration of Querydsl and QBE fetchers
Replace the TypeVisitor with a WiringFactory that checks for existing registrations in RuntimeWiring.Builder. Closes gh-244
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.../java/org/springframework/graphql/data/query/AutoRegistrationRuntimeWiringConfigurer.java
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| /* | ||
| * Copyright 2002-2022 the original author or authors. | ||
| * | ||
| * 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 | ||
| * | ||
| * https://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 org.springframework.graphql.data.query; | ||
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| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.function.Function; | ||
| import java.util.function.Predicate; | ||
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| import graphql.language.FieldDefinition; | ||
| import graphql.schema.DataFetcher; | ||
| import graphql.schema.GraphQLList; | ||
| import graphql.schema.GraphQLNamedOutputType; | ||
| import graphql.schema.GraphQLType; | ||
| import graphql.schema.idl.FieldWiringEnvironment; | ||
| import graphql.schema.idl.RuntimeWiring; | ||
| import graphql.schema.idl.WiringFactory; | ||
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| import org.springframework.graphql.execution.RuntimeWiringConfigurer; | ||
| import org.springframework.lang.Nullable; | ||
| import org.springframework.util.Assert; | ||
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| /** | ||
| * Given a map of GraphQL type names and DataFetcher factories, find queries | ||
| * with a matching return type and register DataFetcher's for them, unless they | ||
| * already have registrations. | ||
| * | ||
| * @author Rossen Stoyanchev | ||
| * @since 1.0.0 | ||
| */ | ||
| class AutoRegistrationRuntimeWiringConfigurer implements RuntimeWiringConfigurer { | ||
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| private final Map<String, Function<Boolean, DataFetcher<?>>> dataFetcherFactories; | ||
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| public AutoRegistrationRuntimeWiringConfigurer( | ||
| Map<String, Function<Boolean, DataFetcher<?>>> dataFetcherFactories) { | ||
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| this.dataFetcherFactories = dataFetcherFactories; | ||
| } | ||
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| @Override | ||
| public void configure(RuntimeWiring.Builder builder) { | ||
| } | ||
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| @Override | ||
| public void configure(RuntimeWiring.Builder builder, List<WiringFactory> container) { | ||
| container.add(new AutoRegistrationWiringFactory(builder)); | ||
| } | ||
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| private class AutoRegistrationWiringFactory implements WiringFactory { | ||
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| private final RuntimeWiring.Builder builder; | ||
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| @Nullable | ||
| private Predicate<String> existingQueryDataFetcherPredicate; | ||
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| AutoRegistrationWiringFactory(RuntimeWiring.Builder builder) { | ||
| this.builder = builder; | ||
| } | ||
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| @Override | ||
| public boolean providesDataFetcher(FieldWiringEnvironment environment) { | ||
| if (dataFetcherFactories.isEmpty()) { | ||
| return false; | ||
| } | ||
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| if (!environment.getParentType().getName().equals("Query")) { | ||
| return false; | ||
| } | ||
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| GraphQLType outputType = (environment.getFieldType() instanceof GraphQLList ? | ||
| ((GraphQLList) environment.getFieldType()).getWrappedType() : | ||
| environment.getFieldType()); | ||
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| String outputTypeName = (outputType instanceof GraphQLNamedOutputType ? | ||
| ((GraphQLNamedOutputType) outputType).getName() : null); | ||
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| return (outputTypeName != null && | ||
| dataFetcherFactories.containsKey(outputTypeName) && | ||
| !hasDataFetcherFor(environment.getFieldDefinition())); | ||
| } | ||
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| private boolean hasDataFetcherFor(FieldDefinition fieldDefinition) { | ||
| if (this.existingQueryDataFetcherPredicate == null) { | ||
| Map<String, ?> map = this.builder.build().getDataFetcherForType("Query"); | ||
| this.existingQueryDataFetcherPredicate = fieldName -> map.get(fieldName) != null; | ||
| } | ||
| return this.existingQueryDataFetcherPredicate.test(fieldDefinition.getName()); | ||
| } | ||
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| @Override | ||
| public DataFetcher<?> getDataFetcher(FieldWiringEnvironment environment) { | ||
| return environment.getFieldType() instanceof GraphQLList ? | ||
| initDataFetcher(((GraphQLList) environment.getFieldType()).getWrappedType(), false) : | ||
| initDataFetcher(environment.getFieldType(), true); | ||
| } | ||
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| private DataFetcher<?> initDataFetcher(GraphQLType type, boolean single) { | ||
| Assert.isInstanceOf(GraphQLNamedOutputType.class, type); | ||
| String typeName = ((GraphQLNamedOutputType) type).getName(); | ||
| Function<Boolean, DataFetcher<?>> factory = dataFetcherFactories.get(typeName); | ||
| Assert.notNull(factory, "Expected DataFetcher factory"); | ||
| return factory.apply(single); | ||
| } | ||
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| } | ||
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| } |
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