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.dse.driver.internal.core.insights;
  
  import static com.datastax.oss.driver.api.core.config.DefaultDriverOption.CONNECTION_POOL_REMOTE_SIZE;
  
  import com.datastax.oss.driver.api.core.config.DriverExecutionProfile;
  import com.datastax.oss.driver.api.core.loadbalancing.NodeDistance;
  import com.datastax.oss.driver.api.core.metadata.Node;
  import com.datastax.oss.driver.internal.core.context.InternalDriverContext;
  import com.datastax.oss.driver.shaded.guava.common.annotations.VisibleForTesting;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Set;
  
  class DataCentersFinder {
  
    Set<String> getDataCenters(InternalDriverContext driverContext) {
      return getDataCenters(
          driverContext.getMetadataManager().getMetadata().getNodes().values(),
          driverContext.getConfig().getDefaultProfile());
    }
  
    @VisibleForTesting
    Set<String> getDataCenters(Collection<Node> nodes, DriverExecutionProfile executionProfile) {
  
      int remoteConnectionsLength = executionProfile.getInt(CONNECTION_POOL_REMOTE_SIZE);
  
      Set<String> dataCenters = new HashSet<>();
      for (Node n : nodes) {
        NodeDistance distance = n.getDistance();
  
        if (distance.equals(NodeDistance.LOCAL)
            || (distance.equals(NodeDistance.REMOTE) && remoteConnectionsLength > 0)) {
          dataCenters.add(n.getDatacenter());
        }
      }
      return dataCenters;
    }
  }
  