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 com.cloud.consoleproxy;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.List;
  import java.util.Map;
  
  import javax.naming.ConfigurationException;
  
  import com.cloud.utils.component.AdapterBase;
  import com.cloud.vm.ConsoleProxy;
  
  public class ConsoleProxyBalanceAllocator extends AdapterBase implements ConsoleProxyAllocator {
  
      @Override
      public Long allocProxy(List<? extends ConsoleProxy> candidates, final Map<Long, Integer> loadInfo, long dataCenterId) {
          List<ConsoleProxy> allocationList = new ArrayList<ConsoleProxy>(candidates);
  
          Collections.sort(candidates, new Comparator<ConsoleProxy>() {
              @Override
              public int compare(ConsoleProxy x, ConsoleProxy y) {
                  Integer loadOfX = loadInfo.get(x.getId());
                  Integer loadOfY = loadInfo.get(y.getId());
  
                  if (loadOfX != null && loadOfY != null) {
                      if (loadOfX < loadOfY)
                          return -1;
                      else if (loadOfX > loadOfY)
                          return 1;
                      return 0;
                  } else if (loadOfX == null && loadOfY == null) {
                      return 0;
                  } else {
                      if (loadOfX == null)
                          return -1;
                      return 1;
                  }
              }
          });
  
          return (allocationList.size() > 0) ? allocationList.get(0).getId() : null;
      }
  
      @Override
      public boolean configure(String name, Map<String, Object> params) throws ConfigurationException {
          return true;
      }
  
      @Override
      public boolean start() {
          return true;
      }
  
      @Override
      public boolean stop() {
          return true;
      }
  }
  