/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 org.apache.hadoop.yarn.server.resourcemanager.scheduler.constraint.processor;

import org.apache.hadoop.yarn.server.resourcemanager.scheduler.NodeFilter;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.SchedulerNode;

import java.util.List;

/**
 * A read only implementation of the ClusterNodeTracker which exposes a method
 * to simply return a filtered list of nodes.
 */
public interface NodeCandidateSelector {

  /**
   * Select a list of nodes given a filter.
   * @param filter a NodeFilter.
   * @return List of SchedulerNodes.
   */
  List<SchedulerNode> selectNodes(NodeFilter filter);

}
