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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.dispatch;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.dispatch.searchcluster.Node;
import com.yahoo.search.result.Coverage;
import com.yahoo.search.result.ErrorMessage;
import com.yahoo.search.searchchain.Execution;
import java.io.IOException;
import java.util.Optional;
/**
* SearchInvoker encapsulates an allocated connection for running a single search query.
* The invocation object can be stateful and should not be reused.
*
* @author ollivir
*/
public abstract class SearchInvoker extends CloseableInvoker {
private final Optional<Node> node;
private ResponseMonitor<SearchInvoker> monitor;
protected SearchInvoker(Optional<Node> node) {
this.node = node;
}
/**
* Retrieve the hits for the given {@link Query}. If the search is run on multiple content
* nodes, the provided {@link Execution} may be used to retrieve document summaries required
* for correct result windowing.
*/
public Result search(Query query, Execution execution) throws IOException {
sendSearchRequest(query, null);
InvokerResult result = getSearchResult(execution);
setFinalStatus(result.getResult().hits().getError() == null);
result.complete();
return result.getResult();
}
/**
*
* @param query the query to send
* @param context a context object that can be used to pass context among different
* invokers, e.g for reuse of preserialized data.
* @return an object that can be passed to the next invocation of sendSearchRequest
*/
protected abstract Object sendSearchRequest(Query query, Object context) throws IOException;
protected abstract InvokerResult getSearchResult(Execution execution) throws IOException;
protected void setMonitor(ResponseMonitor<SearchInvoker> monitor) {
this.monitor = monitor;
}
protected void responseAvailable() {
if (monitor != null) {
monitor.responseAvailable(this);
}
}
protected Optional<Integer> distributionKey() {
return node.map(Node::key);
}
protected InvokerResult errorResult(Query query, ErrorMessage errorMessage) {
Result error = new Result(query, errorMessage);
Coverage errorCoverage = new Coverage(0, 0, 0);
errorCoverage.setNodesTried(1);
error.setCoverage(errorCoverage);
return new InvokerResult(error);
}
}
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