heron/schedulers/src/java/com/twitter/heron/scheduler/NullScheduler.java

// Copyright 2016 Twitter. All rights reserved.
//
// 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 com.twitter.heron.scheduler;

import java.util.ArrayList;
import java.util.List;

import com.twitter.heron.proto.scheduler.Scheduler;
import com.twitter.heron.spi.common.Config;
import com.twitter.heron.spi.packing.PackingPlan;
import com.twitter.heron.spi.scheduler.IScheduler;

public class NullScheduler implements IScheduler {

  @Override
  public void initialize(Config config, Config runtime) {

  }

  @Override
  public void close() {

  }

  @Override
  public boolean onSchedule(PackingPlan packing) {
    return true;
  }

  @Override
  public List<String> getJobLinks() {
    return new ArrayList<>();
  }

  @Override
  public boolean onKill(Scheduler.KillTopologyRequest request) {
    return true;
  }

  @Override
  public boolean onRestart(Scheduler.RestartTopologyRequest request) {
    return true;
  }

  @Override
  public boolean onUpdate(Scheduler.UpdateTopologyRequest request) {
    return false;
  }
}