content: /*
   * 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
   *
   *     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 org.apache.ambari.server.stageplanner;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  import java.util.Map;
  import java.util.TreeMap;
  
  import org.apache.ambari.server.Role;
  import org.apache.ambari.server.RoleCommand;
  
  public class RoleGraphNode {
    public RoleGraphNode(Role role, RoleCommand command) {
      this.role = role;
      this.command = command;
    }
    private Role role;
    private RoleCommand command;
    private int inDegree = 0;
    private List<String> hosts = new ArrayList<>();
    private Map<String, RoleGraphNode> edges = new TreeMap<>();
    public synchronized void addHost(String host) {
      hosts.add(host);
    }
    public synchronized void addEdge(RoleGraphNode rgn) {
      if (edges.containsKey(rgn.getRole().toString())) {
        return;
      }
      edges.put(rgn.getRole().toString(), rgn);
      rgn.incrementInDegree();
    }
    private synchronized void incrementInDegree() {
      inDegree ++;
    }
    public Role getRole() {
      return role;
    }
    public RoleCommand getCommand() {
      return command;
    }
    public List<String> getHosts() {
      return hosts;
    }
    public int getInDegree() {
      return inDegree;
    }
    
    Collection<RoleGraphNode> getEdges() {
      return edges.values();
    }
    public synchronized void decrementInDegree() {
      inDegree --;
    }
    
    @Override
    public String toString() {
      StringBuilder builder = new StringBuilder();
      builder.append("(").append(role).append(", ").append(command).append(", ").append(inDegree).append(")");
      return builder.toString();
    }
  }
  