| /* |
| * 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.elasticsearch; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.util.Iterator; |
| |
| import org.apache.camel.Exchange; |
| import org.elasticsearch.action.search.ClearScrollRequest; |
| import org.elasticsearch.action.search.SearchRequest; |
| import org.elasticsearch.action.search.SearchResponse; |
| import org.elasticsearch.action.search.SearchScrollRequest; |
| import org.elasticsearch.client.RequestOptions; |
| import org.elasticsearch.client.RestHighLevelClient; |
| import org.elasticsearch.common.unit.TimeValue; |
| import org.elasticsearch.search.Scroll; |
| import org.elasticsearch.search.SearchHit; |
| |
| import static org.apache.camel.component.elasticsearch.ElasticsearchConstants.PROPERTY_SCROLL_ES_QUERY_COUNT; |
| |
| public class ElasticsearchScrollRequestIterator implements Iterator<SearchHit>, Closeable { |
| private final SearchRequest searchRequest; |
| private final RestHighLevelClient restHighLevelClient; |
| private Iterator<SearchHit> currentSearchHits; |
| private final int scrollKeepAliveMs; |
| private Exchange exchange; |
| private String scrollId; |
| private boolean closed; |
| private int requestCount; |
| |
| public ElasticsearchScrollRequestIterator(SearchRequest searchRequest, RestHighLevelClient restHighLevelClient, int scrollKeepAliveMs, Exchange exchange) throws IOException { |
| this.searchRequest = searchRequest; |
| this.restHighLevelClient = restHighLevelClient; |
| this.scrollKeepAliveMs = scrollKeepAliveMs; |
| this.exchange = exchange; |
| this.closed = false; |
| this.requestCount = 0; |
| |
| // add scroll option on the the first query |
| searchRequest.scroll(TimeValue.timeValueMillis(scrollKeepAliveMs)); |
| |
| setFirstCurrentSearchHits(); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| if (closed) { |
| return false; |
| } |
| |
| boolean hasNext = currentSearchHits.hasNext(); |
| if (!hasNext) { |
| updateCurrentSearchHits(); |
| |
| hasNext = currentSearchHits.hasNext(); |
| } |
| |
| return hasNext; |
| } |
| |
| @Override |
| public SearchHit next() { |
| return closed ? null : currentSearchHits.next(); |
| } |
| |
| /** |
| * Execute next Elasticsearch scroll request and update the current scroll result. |
| */ |
| private void updateCurrentSearchHits() { |
| SearchResponse searchResponse = scrollSearch(); |
| this.currentSearchHits = searchResponse.getHits().iterator(); |
| } |
| |
| private void setFirstCurrentSearchHits() { |
| SearchResponse searchResponse = firstSearch(); |
| this.currentSearchHits = searchResponse.getHits().iterator(); |
| this.scrollId = searchResponse.getScrollId(); |
| } |
| |
| private SearchResponse firstSearch() { |
| SearchResponse searchResponse; |
| try { |
| searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT); |
| requestCount++; |
| } catch (IOException e) { |
| throw new IllegalStateException(e); |
| } |
| return searchResponse; |
| } |
| |
| private SearchResponse scrollSearch() { |
| SearchResponse searchResponse; |
| try { |
| SearchScrollRequest searchScrollRequest = new SearchScrollRequest() |
| .scroll(new Scroll(TimeValue.timeValueMillis(scrollKeepAliveMs))) |
| .scrollId(scrollId); |
| |
| searchResponse = restHighLevelClient.scroll(searchScrollRequest, RequestOptions.DEFAULT); |
| requestCount++; |
| } catch (IOException e) { |
| throw new IllegalStateException(e); |
| } |
| return searchResponse; |
| } |
| |
| @Override |
| public void close() { |
| if (!closed) { |
| try { |
| ClearScrollRequest clearScrollRequest = new ClearScrollRequest(); |
| clearScrollRequest.addScrollId(scrollId); |
| |
| restHighLevelClient.clearScroll(clearScrollRequest, RequestOptions.DEFAULT); |
| closed = true; |
| exchange.setProperty(PROPERTY_SCROLL_ES_QUERY_COUNT, requestCount); |
| } catch (IOException e) { |
| throw new IllegalStateException(e); |
| } |
| } |
| } |
| |
| public int getRequestCount() { |
| return requestCount; |
| } |
| |
| public boolean isClosed() { |
| return closed; |
| } |
| } |