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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.searchchain;
import com.yahoo.component.chain.Chain;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.Searcher;
import com.yahoo.search.result.Hit;
import com.yahoo.search.result.HitGroup;
import org.junit.jupiter.api.Test;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicInteger;
import static org.junit.jupiter.api.Assertions.assertEquals;
/**
* @author bratseth
*/
public class AsyncExecutionOfOneChainTestCase {
private static final double delta = 0.0000001;
/** Tests having a result with some slow source data which should pass directly to rendering */
@Test
void testParallelExecutionOfOneChain() {
ExecutorService executor = Executors.newFixedThreadPool(16);
// Setup
Chain<Searcher> mainChain = new Chain<>(new ParallelExecutor(executor), new ResultProcessor(), new RegularProvider());
// Execute
Result result = new Execution(mainChain, Execution.Context.createContextStub()).search(new Query());
// Verify
assertEquals(3 * 2, result.hits().size(), "Received 2 hits from 3 threads");
assertEquals(1.0, result.hits().get("thread-0:hit-0").getRelevance().getScore(), delta);
assertEquals(1.0, result.hits().get("thread-1:hit-0").getRelevance().getScore(), delta);
assertEquals(1.0, result.hits().get("thread-2:hit-0").getRelevance().getScore(), delta);
assertEquals(0.5, result.hits().get("thread-0:hit-1").getRelevance().getScore(), delta);
assertEquals(0.5, result.hits().get("thread-1:hit-1").getRelevance().getScore(), delta);
assertEquals(0.5, result.hits().get("thread-2:hit-1").getRelevance().getScore(), delta);
assertEquals(0, executor.shutdownNow().size());
}
private static class ParallelExecutor extends Searcher {
/** The number of parallel executions */
private static final int parallelism = 2;
private final Executor executor;
ParallelExecutor(Executor executor) { this.executor = executor; }
@Override
public Result search(Query query, Execution execution) {
List<FutureResult> futureResults = new ArrayList<>(parallelism);
for (int i = 0; i < parallelism; i++)
futureResults.add(new AsyncExecution(execution).search(query.clone()));
Result mainResult = execution.search(query);
// Add hits from other threads
AsyncExecution.waitForAll(futureResults,query.getTimeLeft());
for (FutureResult futureResult : futureResults) {
Result result = futureResult.get();
mainResult.mergeWith(result);
mainResult.hits().addAll(result.hits().asList());
}
return mainResult;
}
}
private static class RegularProvider extends Searcher {
private final AtomicInteger counter = new AtomicInteger();
@Override
public Result search(Query query,Execution execution) {
String thread="thread-" + counter.getAndIncrement();
Result result=new Result(query,new HitGroup("test"));
result.hits().add(new Hit(thread + ":hit-0",1.0));
result.hits().add(new Hit(thread + ":hit-1",0.9));
return result;
}
}
private static class ResultProcessor extends Searcher {
@Override
public Result search(Query query,Execution execution) {
Result result=execution.search(query);
int i=1;
for (Iterator<Hit> hits=result.hits().deepIterator(); hits.hasNext(); )
hits.next().setRelevance(1d/i++);
return result;
}
}
}
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