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.cassandra.sidecar.handlers;
  
  import java.util.Collections;
  import java.util.Set;
  
  import com.google.inject.Inject;
  import io.vertx.core.http.HttpServerRequest;
  import io.vertx.core.net.SocketAddress;
  import io.vertx.ext.auth.authorization.Authorization;
  import io.vertx.ext.web.RoutingContext;
  import org.apache.cassandra.sidecar.acl.authorization.BasicPermissions;
  import org.apache.cassandra.sidecar.common.server.CompactionStatsOperations;
  import org.apache.cassandra.sidecar.common.server.utils.CompactionStatsConverter;
  import org.apache.cassandra.sidecar.concurrent.ExecutorPools;
  import org.apache.cassandra.sidecar.utils.InstanceMetadataFetcher;
  import org.jetbrains.annotations.NotNull;
  
  /**
   * Handler for retrieving compaction statistics
   */
  public class CompactionStatsHandler extends AbstractHandler<Void> implements AccessProtected
  {
      /**
       * Constructs a handler with the provided {@code metadataFetcher}
       *
       * @param metadataFetcher the metadata fetcher
       * @param executorPools   executor pools for blocking executions
       */
      @Inject
      protected CompactionStatsHandler(final InstanceMetadataFetcher metadataFetcher, final ExecutorPools executorPools)
      {
          super(metadataFetcher, executorPools, null);
      }
  
      @Override
      public Set<Authorization> requiredAuthorizations()
      {
          return Collections.singleton(BasicPermissions.STATS_CLUSTER_SCOPED.toAuthorization());
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void handleInternal(RoutingContext context,
                                 HttpServerRequest httpRequest,
                                 @NotNull String host,
                                 SocketAddress remoteAddress,
                                 Void request)
      {
          CompactionStatsOperations compactionStatsOperations = metadataFetcher.delegate(host).compactionStatsOperations();
  
          executorPools.service()
                       .executeBlocking(() -> CompactionStatsConverter.toResponse(compactionStatsOperations.compactionStats()))
                       .onSuccess(context::json)
                       .onFailure(cause -> processFailure(cause, context, host, remoteAddress, request));
      }
  
      @Override
      protected Void extractParamsOrThrow(RoutingContext context)
      {
          return null;
      }
  }
  