server/src/main/java/io/druid/client/cache/CacheConfig.java

/*
 * Druid - a distributed column store.
 * Copyright 2012 - 2015 Metamarkets Group Inc.
 *
 * Licensed 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 "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.druid.client.cache;

import com.fasterxml.jackson.annotation.JsonProperty;
import io.druid.query.Query;

import javax.validation.constraints.Min;
import java.util.Arrays;
import java.util.List;

public class CacheConfig
{
  public static final String USE_CACHE = "useCache";
  public static final String POPULATE_CACHE = "populateCache";

  @JsonProperty
  private boolean useCache = false;

  @JsonProperty
  private boolean populateCache = false;

  @JsonProperty
  @Min(0)
  private int numBackgroundThreads = 0;

  @JsonProperty
  private List<String> unCacheable = Arrays.asList(Query.GROUP_BY, Query.SELECT);

  public boolean isPopulateCache()
  {
    return populateCache;
  }

  public boolean isUseCache()
  {
    return useCache;
  }

  public int getNumBackgroundThreads(){
    return numBackgroundThreads;
  }

  public boolean isQueryCacheable(Query query)
  {
    // O(n) impl, but I don't think we'll ever have a million query types here
    return !unCacheable.contains(query.getType());
  }
}