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// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.dispatch;
import com.yahoo.prelude.fastsearch.FastHit;
import com.yahoo.search.Result;
import com.yahoo.search.result.Hit;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* InterleavedFillInvoker uses multiple {@link FillInvoker} objects to interface with content
* nodes in parallel. Operationally it first sends requests with all contained invokers and then
* collects the results.
*
* @author ollivir
*/
public class InterleavedFillInvoker extends FillInvoker {
private final Map<Integer, FillInvoker> invokers;
private Map<Integer, Result> expectedFillResults = null;
public InterleavedFillInvoker(Map<Integer, FillInvoker> invokers) {
this.invokers = invokers;
}
@Override
protected void sendFillRequest(Result result, String summaryClass) {
expectedFillResults = new HashMap<>();
for (Iterator<Hit> it = result.hits().deepIterator(); it.hasNext();) {
Hit hit = it.next();
if (hit instanceof FastHit) {
FastHit fhit = (FastHit) hit;
Result res = expectedFillResults.computeIfAbsent(fhit.getDistributionKey(), dk -> new Result(result.getQuery()));
res.hits().add(fhit);
}
}
expectedFillResults.forEach((distKey, partialResult) -> {
FillInvoker invoker = invokers.get(distKey);
if (invoker != null) {
invoker.sendFillRequest(partialResult, summaryClass);
}
});
}
@Override
protected void getFillResults(Result result, String summaryClass) {
if (expectedFillResults == null) {
return;
}
expectedFillResults.forEach((distKey, partialResult) -> {
FillInvoker invoker = invokers.get(distKey);
if (invoker != null) {
invoker.getFillResults(partialResult, summaryClass);
}
});
}
@Override
protected void release() {
if (!invokers.isEmpty()) {
invokers.values().forEach(FillInvoker::close);
invokers.clear();
}
}
}
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