content: /*
   *  Licensed to the Apache Software Foundation (ASF) under one
   *  or more contributor license agreements.  See the NOTICE file
   *  distributed with this work for additional information
   *  regarding copyright ownership.  The ASF licenses this file
   *  to you 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 org.apache.causeway.viewer.graphql.viewer.integration;
  
  import jakarta.inject.Inject;
  
  import org.springframework.graphql.ExecutionGraphQlRequest;
  import org.springframework.graphql.ExecutionGraphQlResponse;
  import org.springframework.graphql.ExecutionGraphQlService;
  import org.springframework.graphql.execution.BatchLoaderRegistry;
  import org.springframework.graphql.execution.DefaultExecutionGraphQlService;
  import org.springframework.graphql.execution.GraphQlSource;
  import org.springframework.stereotype.Service;
  
  import lombok.RequiredArgsConstructor;
  import reactor.core.publisher.Mono;
  
  /**
   * Defers calling of {@link GraphQlSourceForCauseway#schema()} until after the metamodel is fully introspected.
   */
  @Service()
  @RequiredArgsConstructor(onConstructor_ = {@Inject})
  public class ExecutionGraphQlServiceForCauseway implements ExecutionGraphQlService {
  
      private final BatchLoaderRegistry batchLoaderRegistry;
      private final GraphQlSource graphQlSource;
  
      DefaultExecutionGraphQlService delegate;
  
      @Override
      public Mono<ExecutionGraphQlResponse> execute(final ExecutionGraphQlRequest request) {
          if(delegate == null) {
              try {
                  delegate = new DefaultExecutionGraphQlService(graphQlSource);
                  delegate.addDataLoaderRegistrar(batchLoaderRegistry);
              } catch (Exception e) {
                  e.printStackTrace();
                  throw e;
              }
          }
          return delegate.execute(request);
      }
  }
  