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.alibaba.jstorm.yarn.registry;
  
  import com.alibaba.jstorm.yarn.constants.JstormKeys;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.registry.client.api.BindFlags;
  import org.apache.hadoop.registry.client.api.RegistryOperations;
  import org.apache.hadoop.registry.client.binding.RegistryUtils;
  import org.apache.hadoop.registry.client.types.ServiceRecord;
  import org.apache.hadoop.yarn.api.records.ContainerId;
  
  import java.io.IOException;
  import java.util.Date;
  import java.util.List;
  
  /**
   * every container has a view which indicate used resources include core memory,port etc
   *
   * Created by fengjian on 16/3/29.
   */
  public class ContainersView {
      private static final Log LOG = LogFactory.getLog(ContainersView.class);
  
      private String instanceName;
      private String host;
      private ContainerId containerId;
      private RegistryOperations registryOperations;
  
      public ContainersView(String instanceName, String host, ContainerId containerId, RegistryOperations registryOperations) {
          this.instanceName = instanceName;
          this.containerId = containerId;
          this.registryOperations = registryOperations;
          this.host = host;
      }
  
      public List<String> getContainerFreePorts() {
          return null;
      }
  
      public List<String> getHostUsedPort() {
          return null;
      }
  
      public List<String> findFreePorts(int count) {
          return null;
      }
  
      public String getHostPath() {
          String hostPath = RegistryUtils.servicePath(
                  JstormKeys.APP_TYPE, this.instanceName, host);
          return hostPath;
      }
  
      /**
       * see if anyone is updating host's port list, if not start , update this host itself
       * timeout is 45 seconds
       *
       * @throws InterruptedException
       * @throws IOException
       */
      private void tryHostLock() throws Exception {
  
          String hostPath = getHostPath();
          //if path has created 60 seconds ago, then delete
          if (registryOperations.exists(hostPath)) {
              try {
                  ServiceRecord host = registryOperations.resolve(hostPath);
                  Long cTime = Long.parseLong(host.get("cTime", "0"));
                  Date now = new Date();
                  if (now.getTime() - cTime > 60 * 1000 || cTime > now.getTime())
                      registryOperations.delete(hostPath, true);
              } catch (Exception ex) {
                  LOG.error(ex);
  //                registryOperations.delete(hostPath, true);
              }
          }
  
          int failedCount = 45;
          while (!registryOperations.mknode(hostPath, true)) {
              Thread.sleep(1000);
              failedCount--;
              if (failedCount <= 0)
                  break;
          }
  
          if (failedCount > 0) {
              ServiceRecord sr = new ServiceRecord();
              Date date = new Date();
              date.getTime();
              sr.set("cTime", String.valueOf(date.getTime()));
              registryOperations.bind(hostPath, sr, BindFlags.OVERWRITE);
              return;
          }
  
  
          throw new Exception("can't get host lock");
      }
  
      private void releaseHostLock() throws IOException {
          String hostPath = getHostPath();
          registryOperations.delete(hostPath, true);
      }
  
  
  }
  