com.yelp.nrtsearch.server.luceneserver.SuggestLookupHandler Maven / Gradle / Ivy

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GRPC lucene server using near-real-time replication
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/*
 * Copyright 2020 Yelp Inc.
 *
 * Licensed 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.yelp.nrtsearch.server.luceneserver;

import com.yelp.nrtsearch.server.grpc.OneSuggestLookupResponse;
import com.yelp.nrtsearch.server.grpc.SuggestLookupHighlight;
import com.yelp.nrtsearch.server.grpc.SuggestLookupRequest;
import com.yelp.nrtsearch.server.grpc.SuggestLookupResponse;
import java.io.IOException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.lucene.search.suggest.Lookup;
import org.apache.lucene.search.suggest.analyzing.AnalyzingInfixSuggester;
import org.apache.lucene.util.BytesRef;

public class SuggestLookupHandler implements Handler {
  @Override
  public SuggestLookupResponse handle(
      IndexState indexState, SuggestLookupRequest suggestLookupRequest) throws HandlerException {
    String suggestName = suggestLookupRequest.getSuggestName();
    final Lookup lookup = indexState.getSuggesters().get(suggestName);
    if (lookup == null) {
      throw new RuntimeException(
          "suggestName: this suggester (\""
              + suggestName
              + "\") was not yet built; valid suggestNames: "
              + indexState.getSuggesters().keySet());
    }
    final String text = suggestLookupRequest.getText();
    final int count = suggestLookupRequest.getCount() == 0 ? 5 : suggestLookupRequest.getCount();
    final boolean allTermsRequired = suggestLookupRequest.getAllTermsRequired();
    final boolean highlight = suggestLookupRequest.getHighlight();

    final Set contexts;
    if (!suggestLookupRequest.getContextsList().isEmpty()) {
      contexts = new HashSet<>();
      for (String each : suggestLookupRequest.getContextsList()) {
        contexts.add(new BytesRef(each));
      }
    } else {
      contexts = null;
    }

    List results;
    try {
      // Make sure lookup object is not a subclass of AnalyzingInfixSuggester.
      if (lookup instanceof AnalyzingInfixSuggester
          && lookup.getClass() == AnalyzingInfixSuggester.class) {
        results =
            ((AnalyzingInfixSuggester) lookup)
                .lookup(text, contexts, count, allTermsRequired, highlight);
      } else {
        results = lookup.lookup(text, contexts, false, count);
      }
    } catch (IOException e) {
      throw new RuntimeException(e);
    }

    SuggestLookupResponse.Builder suggestLookupResponseBuilder = SuggestLookupResponse.newBuilder();
    for (Lookup.LookupResult result : results) {
      OneSuggestLookupResponse.Builder oneSuggestLookupResponseBuilder =
          OneSuggestLookupResponse.newBuilder();
      if (result.highlightKey != null) {
        oneSuggestLookupResponseBuilder.setSuggestLookupHighlight(
            (SuggestLookupHighlight) result.highlightKey);
      } else {
        oneSuggestLookupResponseBuilder.setKey(result.key.toString());
      }
      oneSuggestLookupResponseBuilder.setWeight(result.value);
      if (result.payload != null) {
        oneSuggestLookupResponseBuilder.setPayload(result.payload.utf8ToString());
      }
      suggestLookupResponseBuilder.addResults(oneSuggestLookupResponseBuilder);
    }
    return suggestLookupResponseBuilder.build();
  }
}