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 com.datastax.oss.driver.internal.core.config.composite;
  
  import com.datastax.oss.driver.api.core.config.DriverConfig;
  import com.datastax.oss.driver.api.core.config.DriverExecutionProfile;
  import com.datastax.oss.driver.shaded.guava.common.collect.Sets;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import java.util.Collections;
  import java.util.Map;
  import java.util.Objects;
  import java.util.concurrent.ConcurrentHashMap;
  
  public class CompositeDriverConfig implements DriverConfig {
  
    private final DriverConfig primaryConfig;
    private final DriverConfig fallbackConfig;
    private final Map<String, CompositeDriverExecutionProfile> profiles = new ConcurrentHashMap<>();
  
    public CompositeDriverConfig(
        @NonNull DriverConfig primaryConfig, @NonNull DriverConfig fallbackConfig) {
      this.primaryConfig = Objects.requireNonNull(primaryConfig);
      this.fallbackConfig = Objects.requireNonNull(fallbackConfig);
    }
  
    @NonNull
    @Override
    public DriverExecutionProfile getProfile(@NonNull String profileName) {
      return profiles.compute(
          profileName,
          (k, v) ->
              (v == null)
                  ? new CompositeDriverExecutionProfile(primaryConfig, fallbackConfig, profileName)
                  : v.refresh());
    }
  
    @NonNull
    @Override
    public Map<String, ? extends DriverExecutionProfile> getProfiles() {
      // The map is updated lazily, if we want all the profiles we need to fetch them explicitly
      for (String name :
          Sets.union(primaryConfig.getProfiles().keySet(), fallbackConfig.getProfiles().keySet())) {
        getProfile(name);
      }
      return Collections.unmodifiableMap(profiles);
    }
  }
  