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.camel.component.dns.cloud;
  
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.stream.Collectors;
  
  import org.apache.camel.RuntimeCamelException;
  import org.apache.camel.cloud.ServiceDefinition;
  import org.apache.camel.component.dns.DnsConfiguration;
  import org.apache.camel.impl.cloud.DefaultServiceDefinition;
  import org.apache.camel.impl.cloud.DefaultServiceDiscovery;
  import org.apache.camel.util.ObjectHelper;
  import org.xbill.DNS.Lookup;
  import org.xbill.DNS.Record;
  import org.xbill.DNS.SRVRecord;
  import org.xbill.DNS.TextParseException;
  import org.xbill.DNS.Type;
  
  @Deprecated
  public final class DnsServiceDiscovery extends DefaultServiceDiscovery {
      private static final Comparator<SRVRecord> COMPARATOR = comparator();
      private final DnsConfiguration configuration;
      private final ConcurrentHashMap<String, Lookup> cache;
  
      public DnsServiceDiscovery(DnsConfiguration configuration) {
          this.configuration = configuration;
          this.cache = new ConcurrentHashMap<>();
      }
  
      @Override
      public List<ServiceDefinition> getServices(String name) {
          final Lookup lookup = cache.computeIfAbsent(name, this::createLookup);
          final Record[] records = lookup.run();
  
          List<ServiceDefinition> services;
          if (Objects.nonNull(records) && lookup.getResult() == Lookup.SUCCESSFUL) {
              services = Arrays.stream(records)
                      .filter(SRVRecord.class::isInstance)
                      .map(SRVRecord.class::cast)
                      .sorted(COMPARATOR)
                      .map(srvRecord -> asService(name, srvRecord))
                      .collect(Collectors.toList());
          } else {
              services = Collections.emptyList();
          }
  
          return services;
      }
  
      private Lookup createLookup(String name) {
          try {
              return new Lookup(
                      String.format("%s.%s.%s", name, configuration.getProto(), configuration.getDomain()),
                      Type.SRV);
          } catch (TextParseException e) {
              throw new RuntimeCamelException(e);
          }
      }
  
      private static Comparator<SRVRecord> comparator() {
          Comparator<SRVRecord> byPriority = (e1, e2) -> Integer.compare(e2.getPriority(), e1.getPriority());
          Comparator<SRVRecord> byWeight = (e1, e2) -> Integer.compare(e2.getWeight(), e1.getWeight());
  
          return byPriority.thenComparing(byWeight);
      }
  
      private static ServiceDefinition asService(String serviceName, SRVRecord srvRecord) {
          Map<String, String> meta = new HashMap<>();
          ObjectHelper.ifNotEmpty(srvRecord.getPriority(), val -> meta.put("priority", Integer.toString(val)));
          ObjectHelper.ifNotEmpty(srvRecord.getWeight(), val -> meta.put("weight", Integer.toString(val)));
  
          return new DefaultServiceDefinition(
                  serviceName,
                  srvRecord.getTarget().toString(true),
                  srvRecord.getPort(),
                  meta);
      }
  }
  