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Elasticsearch subproject :server
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.action.search;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.node.ResponseCollectorService;
import org.elasticsearch.search.SearchPhaseResult;
import org.elasticsearch.search.query.QuerySearchResult;
import org.elasticsearch.transport.Transport;
import java.util.Objects;
import java.util.function.BiFunction;
/**
* A wrapper of search action listeners (search results) that unwraps the query
* result to get the piggybacked queue size and service time EWMA, adding those
* values to the coordinating nodes' {@link ResponseCollectorService}.
*/
public final class SearchExecutionStatsCollector implements ActionListener {
private final ActionListener listener;
private final String nodeId;
private final ResponseCollectorService collector;
private final long startNanos;
SearchExecutionStatsCollector(ActionListener listener,
ResponseCollectorService collector,
String nodeId) {
this.listener = Objects.requireNonNull(listener, "listener cannot be null");
this.collector = Objects.requireNonNull(collector, "response collector cannot be null");
this.startNanos = System.nanoTime();
this.nodeId = nodeId;
}
public static BiFunction makeWrapper(ResponseCollectorService service) {
return (connection, originalListener) -> new SearchExecutionStatsCollector(originalListener, service, connection.getNode().getId());
}
@Override
public void onResponse(SearchPhaseResult response) {
QuerySearchResult queryResult = response.queryResult();
if (nodeId != null && queryResult != null) {
final long serviceTimeEWMA = queryResult.serviceTimeEWMA();
final int queueSize = queryResult.nodeQueueSize();
final long responseDuration = System.nanoTime() - startNanos;
// EWMA/queue size may be -1 if the query node doesn't support capturing it
if (serviceTimeEWMA > 0 && queueSize >= 0) {
collector.addNodeStatistics(nodeId, queueSize, responseDuration, serviceTimeEWMA);
}
}
listener.onResponse(response);
}
@Override
public void onFailure(Exception e) {
listener.onFailure(e);
}
}