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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.openecomp.sdc.be.dao.api;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.index.query.QueryBuilder;
import org.elasticsearch.search.sort.SortBuilder;
import org.openecomp.sdc.be.dao.es.ElasticSearchClient;
import javax.annotation.Resource;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* Elastic search dao that manages search operations.
*
* @author luc boutier
*/
public class ESGenericSearchDAO extends ESGenericIdDAO implements IGenericSearchDAO {
private static final int MAX_SEARCH_SIZE = 1000;
@Resource(name = "elasticsearch-client")
private ElasticSearchClient esClient;
@Override
public long count(String indexName, String typeName, QueryBuilder query) {
SearchRequestBuilder searchRequestBuilder = esClient.getClient().prepareSearch(indexName).setTypes(typeName)
.setSize(0);
if (query != null) {
searchRequestBuilder.setQuery(query);
}
SearchResponse response = searchRequestBuilder.execute().actionGet();
if (!somethingFound(response)) {
return 0;
} else {
return response.getHits().getTotalHits();
}
}
/**
* Convert a SearchResponse into a list of objects (json deserialization.)
*
* @param searchResponse
* The actual search response from elastic-search.
* @param clazz
* The type of objects to de-serialize.
* @return A list of instances that contains de-serialized data.
*/
public <T> List<T> toGetListOfData(SearchResponse searchResponse, Class<T> clazz) {
// return null if no data has been found in elastic search.
if (!somethingFound(searchResponse)) {
return null;
}
List<T> result = new ArrayList<>();
for (int i = 0; i < searchResponse.getHits().getHits().length; i++) {
try {
result.add(getJsonMapper().readValue(searchResponse.getHits().getAt(i).getSourceAsString(), clazz));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
return result;
}
public <T> List<T> doCustomFind(Class<T> clazz, String indexName, String typeName, QueryBuilder query,
SortBuilder sortBuilder) {
List<T> result = new ArrayList<>();
SearchRequestBuilder searchRequestBuilder = getClient().prepareSearch(indexName).setTypes(typeName)
.setSize(MAX_SEARCH_SIZE);
if (query != null) {
searchRequestBuilder.setQuery(query);
}
if (sortBuilder != null) {
searchRequestBuilder.addSort(sortBuilder);
}
SearchResponse response = searchRequestBuilder.execute().actionGet();
if (!somethingFound(response)) {
return null;
} else {
for (int i = 0; i < response.getHits().getHits().length; i++) {
String hit = response.getHits().getAt(i).sourceAsString();
T val = null;
try {
val = getJsonMapper().readValue(hit, clazz);
result.add(val);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
return result;
}
}
private boolean somethingFound(final SearchResponse searchResponse) {
if (searchResponse == null || searchResponse.getHits() == null || searchResponse.getHits().getHits() == null
|| searchResponse.getHits().getHits().length == 0) {
return false;
}
return true;
}
}
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