code: /*
   * 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.skywalking.oap.server.storage.plugin.banyandb.measure;
  
  import com.google.common.collect.ImmutableSet;
  import org.apache.skywalking.banyandb.v1.client.DataPoint;
  import org.apache.skywalking.banyandb.v1.client.MeasureQuery;
  import org.apache.skywalking.banyandb.v1.client.MeasureQueryResponse;
  import org.apache.skywalking.banyandb.v1.client.TimestampRange;
  import org.apache.skywalking.oap.server.core.analysis.TimeBucket;
  import org.apache.skywalking.oap.server.core.analysis.manual.searchtag.TagAutocompleteData;
  import org.apache.skywalking.oap.server.core.analysis.manual.searchtag.TagType;
  import org.apache.skywalking.oap.server.core.query.input.Duration;
  import org.apache.skywalking.oap.server.core.storage.query.ITagAutoCompleteQueryDAO;
  import org.apache.skywalking.oap.server.storage.plugin.banyandb.BanyanDBStorageClient;
  import org.apache.skywalking.oap.server.storage.plugin.banyandb.stream.AbstractBanyanDBDAO;
  
  import java.io.IOException;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.Set;
  
  import static java.util.Objects.nonNull;
  
  public class BanyanDBTagAutocompleteQueryDAO extends AbstractBanyanDBDAO implements ITagAutoCompleteQueryDAO {
      private static final Set<String> TAGS_KEY = ImmutableSet.of(TagAutocompleteData.TAG_TYPE,
              TagAutocompleteData.TAG_KEY);
  
      private static final Set<String> TAGS_KV = ImmutableSet.of(TagAutocompleteData.TAG_TYPE,
              TagAutocompleteData.TAG_KEY, TagAutocompleteData.TAG_VALUE);
  
      public BanyanDBTagAutocompleteQueryDAO(BanyanDBStorageClient client) {
          super(client);
      }
  
      @Override
      public Set<String> queryTagAutocompleteKeys(TagType tagType, int limit, Duration duration) throws IOException {
          long startTB = 0;
          long endTB = 0;
          if (nonNull(duration)) {
              startTB = TimeBucket.getMinuteTimeBucket(duration.getStartTimestamp());
              endTB = TimeBucket.getMinuteTimeBucket(duration.getEndTimestamp());
          }
          TimestampRange range = null;
          if (startTB > 0 && endTB > 0) {
              range = new TimestampRange(TimeBucket.getTimestamp(startTB), TimeBucket.getTimestamp(endTB));
          }
          MeasureQueryResponse resp = query(TagAutocompleteData.INDEX_NAME,
                  TAGS_KEY, Collections.emptySet(),
                  range,
                  new QueryBuilder<MeasureQuery>() {
                      @Override
                      protected void apply(MeasureQuery query) {
                          query.groupBy(ImmutableSet.of(TagAutocompleteData.TAG_KEY));
                          query.setLimit(limit);
                          query.and(eq(TagAutocompleteData.TAG_TYPE, tagType.name()));
                      }
                  }
          );
  
          if (resp.size() == 0) {
              return Collections.emptySet();
          }
  
          Set<String> keys = new HashSet<>();
          for (final DataPoint dp : resp.getDataPoints()) {
              keys.add(dp.getTagValue(TagAutocompleteData.TAG_KEY));
          }
          return keys;
      }
  
      @Override
      public Set<String> queryTagAutocompleteValues(TagType tagType, String tagKey, int limit, Duration duration) throws IOException {
          long startSecondTB = 0;
          long endSecondTB = 0;
          if (nonNull(duration)) {
              startSecondTB = duration.getStartTimeBucketInSec();
              endSecondTB = duration.getEndTimeBucketInSec();
          }
  
          long startTB = startSecondTB / 1000000 * 10000;
          long endTB = endSecondTB / 1000000 * 10000 + 2359;
  
          TimestampRange range = null;
          if (startTB > 0 && endTB > 0) {
              range = new TimestampRange(TimeBucket.getTimestamp(startTB), TimeBucket.getTimestamp(endTB));
          }
          MeasureQueryResponse resp = query(TagAutocompleteData.INDEX_NAME,
                  TAGS_KV, Collections.emptySet(),
                  range,
                  new QueryBuilder<MeasureQuery>() {
                      @Override
                      protected void apply(MeasureQuery query) {
                          query.groupBy(ImmutableSet.of(TagAutocompleteData.TAG_VALUE));
                          query.setLimit(limit);
                          query.and(eq(TagAutocompleteData.TAG_TYPE, tagType.name()));
                          query.and(eq(TagAutocompleteData.TAG_KEY, tagKey));
                      }
                  }
          );
  
          if (resp.size() == 0) {
              return Collections.emptySet();
          }
  
          Set<String> values = new HashSet<>();
          for (final DataPoint dp : resp.getDataPoints()) {
              values.add(dp.getTagValue(TagAutocompleteData.TAG_VALUE));
          }
          return values;
      }
  }
  