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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.searchers;
import com.yahoo.component.chain.dependencies.After;
import com.yahoo.metrics.simple.Gauge;
import com.yahoo.metrics.simple.Point;
import com.yahoo.metrics.simple.MetricReceiver;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.Searcher;
import com.yahoo.search.searchchain.Execution;
import com.yahoo.search.searchchain.PhaseNames;
/**
* Measure latency in container before query is sent to backend
*
* @author Arne H Juul
*/
@After(PhaseNames.BACKEND)
public class ContainerLatencySearcher extends Searcher {
private final Gauge latencyGauge;
public ContainerLatencySearcher(MetricReceiver metrics) {
latencyGauge = metrics.declareGauge("query_container_latency");
}
@Override
public Result search(Query query, Execution execution) {
Point dims = latencyGauge.builder()
.set("chain", execution.chain().getId().stringValue())
.build();
latencyGauge.sample(query.getDurationTime(), dims);
return execution.search(query);
}
}
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