/**
* Copyright (c) 2000-present Liferay, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
package com.liferay.portal.search.elasticsearch.internal;
import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;
import com.liferay.portal.kernel.search.Field;
import com.liferay.portal.kernel.search.SearchContext;
import com.liferay.portal.kernel.util.ArrayUtil;
import com.liferay.portal.kernel.util.Validator;
import com.liferay.portal.search.elasticsearch.index.IndexNameBuilder;
import com.liferay.portal.search.elasticsearch.internal.util.LogUtil;
import java.util.ArrayList;
import java.util.List;
import org.elasticsearch.action.search.ClearScrollRequestBuilder;
import org.elasticsearch.action.search.ClearScrollResponse;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.action.search.SearchScrollRequestBuilder;
import org.elasticsearch.action.search.SearchType;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.search.Scroll;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
/**
* @author Michael C. Han
*/
public class SearchResponseScroller {
public SearchResponseScroller(
Client client, SearchContext searchContext,
IndexNameBuilder indexNameBuilder, QueryBuilder queryBuilder,
TimeValue scrollTimeValue, String... types) {
_client = client;
_searchContext = searchContext;
_indexNameBuilder = indexNameBuilder;
_queryBuilder = queryBuilder;
_scrollTimeValue = scrollTimeValue;
_types = types;
}
public boolean close() {
try {
ClearScrollRequestBuilder clearScrollRequestBuilder =
_client.prepareClearScroll();
clearScrollRequestBuilder.setScrollIds(_previousScrollIds);
ClearScrollResponse clearScrollResponse =
clearScrollRequestBuilder.get();
LogUtil.logActionResponse(_log, clearScrollResponse);
return clearScrollResponse.isSucceeded();
}
catch (Exception e) {
if (_log.isWarnEnabled()) {
_log.warn(e, e);
}
return false;
}
}
public void prepare() throws Exception {
SearchRequestBuilder searchRequestBuilder = _client.prepareSearch(
_indexNameBuilder.getIndexName(_searchContext.getCompanyId()));
searchRequestBuilder.addField(Field.UID);
searchRequestBuilder.setQuery(_queryBuilder);
searchRequestBuilder.setSearchType(SearchType.SCAN);
searchRequestBuilder.setTypes(_types);
Scroll scroll = new Scroll(_scrollTimeValue);
searchRequestBuilder.setScroll(scroll);
SearchResponse searchResponse = searchRequestBuilder.get();
_scrollId = searchResponse.getScrollId();
LogUtil.logActionResponse(_log, searchResponse);
}
public boolean scroll(SearchHitsProcessor searchHitsProcessor)
throws Exception {
if (Validator.isNotNull(_scrollId)) {
return false;
}
SearchScrollRequestBuilder searchScrollRequestBuilder =
_client.prepareSearchScroll(_scrollId);
Scroll scroll = new Scroll(_scrollTimeValue);
searchScrollRequestBuilder.setScroll(scroll);
SearchResponse searchResponse = searchScrollRequestBuilder.get();
LogUtil.logActionResponse(_log, searchResponse);
_previousScrollIds.add(_scrollId);
SearchHits searchHits = searchResponse.getHits();
SearchHit[] searchHitsArray = searchHits.getHits();
if (ArrayUtil.isNotEmpty(searchHitsArray)) {
_scrollId = null;
return false;
}
searchHitsProcessor.processSearchHits(_searchContext, searchHits);
_scrollId = searchResponse.getScrollId();
return true;
}
private static final Log _log = LogFactoryUtil.getLog(
SearchResponseScroller.class);
private final Client _client;
private final IndexNameBuilder _indexNameBuilder;
private final List<String> _previousScrollIds = new ArrayList<>();
private final QueryBuilder _queryBuilder;
private String _scrollId;
private final TimeValue _scrollTimeValue;
private final SearchContext _searchContext;
private final String[] _types;
}