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.map;
  
  import com.datastax.oss.driver.api.core.config.DriverConfig;
  import com.datastax.oss.driver.api.core.config.DriverConfigLoader;
  import com.datastax.oss.driver.api.core.config.DriverOption;
  import com.datastax.oss.driver.api.core.config.OptionsMap;
  import com.datastax.oss.driver.api.core.context.DriverContext;
  import com.datastax.oss.driver.internal.core.config.ConfigChangeEvent;
  import com.datastax.oss.driver.internal.core.context.EventBus;
  import com.datastax.oss.driver.internal.core.context.InternalDriverContext;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import java.util.Map;
  import java.util.concurrent.CompletableFuture;
  import java.util.concurrent.CompletionStage;
  import java.util.function.Consumer;
  
  public class MapBasedDriverConfigLoader implements DriverConfigLoader, Consumer<OptionsMap> {
  
    @NonNull private final OptionsMap source;
    @NonNull private final Map<String, Map<DriverOption, Object>> rawMap;
    private volatile EventBus eventBus;
  
    public MapBasedDriverConfigLoader(
        @NonNull OptionsMap source, @NonNull Map<String, Map<DriverOption, Object>> rawMap) {
      this.source = source;
      this.rawMap = rawMap;
    }
  
    @NonNull
    @Override
    public DriverConfig getInitialConfig() {
      return new MapBasedDriverConfig(rawMap);
    }
  
    @Override
    public void onDriverInit(@NonNull DriverContext context) {
      eventBus = ((InternalDriverContext) context).getEventBus();
      source.addChangeListener(this);
    }
  
    @Override
    public void accept(OptionsMap map) {
      assert eventBus != null; // listener is registered after setting this field
      eventBus.fire(ConfigChangeEvent.INSTANCE);
    }
  
    @NonNull
    @Override
    public CompletionStage<Boolean> reload() {
      return CompletableFuture.completedFuture(true);
    }
  
    @Override
    public boolean supportsReloading() {
      return true;
    }
  
    @Override
    public void close() {
      source.removeChangeListener(this);
    }
  }
  