content: /*
   * Copyright (C) 2010-2101 Alibaba Group Holding Limited.
   *
   * 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.alibaba.otter.shared.arbitrate.impl.setl.zookeeper.termin;
  
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  import org.I0Itec.zkclient.exception.ZkException;
  import org.apache.zookeeper.KeeperException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.alibaba.otter.shared.arbitrate.ArbitrateManageService;
  import com.alibaba.otter.shared.arbitrate.exception.ArbitrateException;
  import com.alibaba.otter.shared.arbitrate.impl.setl.helper.StagePathUtils;
  import com.alibaba.otter.shared.arbitrate.impl.zookeeper.ZooKeeperClient;
  import com.alibaba.otter.shared.arbitrate.impl.zookeeper.lock.DistributedLock;
  import com.alibaba.otter.shared.arbitrate.model.TerminEventData;
  import com.alibaba.otter.shared.common.utils.zookeeper.ZkClientx;
  
  /**
   * 抽取异常信号的公共处理，termin的chain处理
   * 
   * @author jianghang 2011-9-27 下午04:58:06
   * @version 4.0.0
   */
  public class ErrorTerminProcess implements TerminProcess {
  
      protected static final Logger    logger    = LoggerFactory.getLogger(ErrorTerminProcess.class);
      protected ZkClientx              zookeeper = ZooKeeperClient.getInstance();
      protected ArbitrateManageService arbitrateManageService;
      protected NormalTerminProcess    normalTerminProcess;
  
      public boolean process(TerminEventData data) {
          DistributedLock lock = new DistributedLock(StagePathUtils.getLoadLock(data.getPipelineId()));
          try {
              boolean locked = lock.tryLock();// 尝试进行锁定，等待当前的load操作完成
              if (!locked) {
                  return false;
              }
              processChain(data);
              return true;
          } catch (KeeperException e) {
              throw new ArbitrateException("Termin_process", e);
          } finally {
              try {
                  lock.unlock();// 马上进行释放
              } catch (KeeperException e1) {
                  // ignore
              }
          }
      }
  
      public void processChain(TerminEventData data) {
          // 关闭对应的服务
          Long pipelineId = data.getPipelineId();
  
          // 清理对应的process
          String processRoot = StagePathUtils.getProcessRoot(pipelineId);
          try {
              List<String> processNodes = zookeeper.getChildren(processRoot);
              // 3. 循环处理每个process
              List<Long> processIds = new ArrayList<Long>();
              for (String process : processNodes) {
                  processIds.add(StagePathUtils.getProcessId(process));
              }
              Collections.sort(processIds); // 排序一下
  
              Long processId = data.getProcessId();
              if (processId != null) {// 可能为空
                  normalTerminProcess.process(data);
              }
  
              for (Long currProcessId : processIds) {
                  if (processId != null && currProcessId <= processId) {
                      continue;
                  }
  
                  // 发送给最小的一个process的termin信号，进行链式的触发
                  data.setProcessId(currProcessId);
                  processChain(data); // 处理异常信息
                  break;
              }
  
          } catch (ZkException e) {
              throw new ArbitrateException("Termin_process", e);
          }
      }
  
      // =================== setter / getter ====================
  
      public void setArbitrateManageService(ArbitrateManageService arbitrateManageService) {
          this.arbitrateManageService = arbitrateManageService;
      }
  
      public void setNormalTerminProcess(NormalTerminProcess normalTerminProcess) {
          this.normalTerminProcess = normalTerminProcess;
      }
  
  }
  