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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.federation;
import com.yahoo.component.ComponentSpecification;
import com.yahoo.component.chain.Chain;
import com.yahoo.component.chain.dependencies.After;
import com.yahoo.prelude.Ping;
import com.yahoo.prelude.Pong;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.Searcher;
import com.yahoo.search.cluster.PingableSearcher;
import com.yahoo.search.result.ErrorMessage;
import com.yahoo.search.result.HitGroup;
import com.yahoo.search.searchchain.Execution;
/**
* A lightweight searcher to forward all incoming requests to a single search
* chain defined in config. An alternative to federation searcher when standard
* semantics are not necessary for the application.
*
* @see FederationSearcher
* @author Steinar Knutsen
*/
@After("*")
public class ForwardingSearcher extends PingableSearcher {
private final ComponentSpecification target;
public ForwardingSearcher(SearchchainForwardConfig config) {
if (config.target() == null) {
throw new RuntimeException("Configuration value searchchain-forward.target was null.");
}
try {
target = new ComponentSpecification(config.target());
} catch (RuntimeException e) {
throw new RuntimeException("Failed constructing the component specification from searchchain-forward.target: "
+ config.target(), e);
}
}
@Override
public Result search(Query query, Execution execution) {
Execution next = createForward(execution);
if (next == null)
return badResult(query);
else
return next.search(query);
}
private Result badResult(Query query) {
return new Result(query, noSearchchain());
}
@Override
public Pong ping(Ping ping, Execution execution) {
Execution next = createForward(execution);
if (next == null)
return badPong();
else
return next.ping(ping);
}
private Pong badPong() {
return new Pong(noSearchchain());
}
@Override
public void fill(Result result, String summaryClass, Execution execution) {
Execution next = createForward(execution);
if (next == null)
badFill(result.hits());
else
next.fill(result, summaryClass);
}
private void badFill(HitGroup hits) {
hits.addError(noSearchchain());
}
private Execution createForward(Execution execution) {
Chain<Searcher> targetChain = execution.context().searchChainRegistry().getComponent(target);
if (targetChain == null) return null;
return new Execution(targetChain, execution.context());
}
private ErrorMessage noSearchchain() {
return ErrorMessage
.createServerIsMisconfigured("Could not get search chain matching component specification: " + target);
}
}
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