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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.federation.selection;
import com.yahoo.processing.execution.chain.ChainRegistry;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.Searcher;
import com.yahoo.search.federation.selection.FederationTarget;
import java.util.Collection;
/**
* Allows adding extra targets that the federation searcher should federate to.
*
* For each federation search call, the federation searcher will call targetSelector.getTargets.
*
* Then, for each target, it will:
* 1) call modifyTargetQuery(target, query)
* 2) call modifyTargetResult(target, result)
*
* @author tonytv
*/
public interface TargetSelector<T> {
Collection<FederationTarget<T>> getTargets(Query query, ChainRegistry<Searcher> searcherChainRegistry);
/**
* For modifying the query before sending it to a the target
*/
void modifyTargetQuery(FederationTarget<T> target, Query query);
/**
* For modifying the result produced by the target.
*/
void modifyTargetResult(FederationTarget<T> target, Result result);
}
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