io.druid.query.search.SearchStrategySelector Maven / Gradle / Ivy
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* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package io.druid.query.search;
import com.google.common.base.Supplier;
import com.google.inject.Inject;
import com.metamx.emitter.EmittingLogger;
import io.druid.java.util.common.ISE;
public class SearchStrategySelector
{
private static final EmittingLogger log = new EmittingLogger(SearchStrategySelector.class);
private final SearchQueryConfig config;
@Inject
public SearchStrategySelector(Supplier configSupplier)
{
this.config = configSupplier.get();
}
public SearchStrategy strategize(SearchQuery query)
{
final String strategyString = config.withOverrides(query).getSearchStrategy();
switch (strategyString) {
case AutoStrategy.NAME:
log.debug("Auto strategy is selected, query id [%s]", query.getId());
return AutoStrategy.of(query);
case UseIndexesStrategy.NAME:
log.debug("Use-index strategy is selected, query id [%s]", query.getId());
return UseIndexesStrategy.of(query);
case CursorOnlyStrategy.NAME:
log.debug("Cursor-only strategy is selected, query id [%s]", query.getId());
return CursorOnlyStrategy.of(query);
default:
throw new ISE("Unknown strategy[%s], query id [%s]", strategyString, query.getId());
}
}
}