io.druid.indexing.overlord.autoscaling.NoopAutoScaler Maven / Gradle / Ivy

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/*
 * 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.indexing.overlord.autoscaling;

import com.metamx.common.UOE;
import com.metamx.emitter.EmittingLogger;

import java.util.List;

/**
 * This class just logs when scaling should occur.
 */
public class NoopAutoScaler implements AutoScaler
{
  private static final EmittingLogger log = new EmittingLogger(NoopAutoScaler.class);

  @Override
  public int getMinNumWorkers()
  {
    return 0;
  }

  @Override
  public int getMaxNumWorkers()
  {
    return 0;
  }

  @Override
  public Void getEnvConfig()
  {
    throw new UOE("No config for Noop!");
  }

  @Override
  public AutoScalingData provision()
  {
    log.info("If I were a real strategy I'd create something now");
    return null;
  }

  @Override
  public AutoScalingData terminate(List ips)
  {
    log.info("If I were a real strategy I'd terminate %s now", ips);
    return null;
  }

  @Override
  public AutoScalingData terminateWithIds(List ids)
  {
    log.info("If I were a real strategy I'd terminate %s now", ids);
    return null;
  }

  @Override
  public List ipToIdLookup(List ips)
  {
    log.info("I'm not a real strategy so I'm returning what I got %s", ips);
    return ips;
  }

  @Override
  public List idToIpLookup(List nodeIds)
  {
    log.info("I'm not a real strategy so I'm returning what I got %s", nodeIds);
    return nodeIds;
  }
}