/*
    * 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.hadoop.chukwa.datacollection.adaptor.filetailer;
  
  import org.apache.log4j.Logger;
  import org.apache.hadoop.chukwa.util.ExceptionUtil;
  
  public class TerminatorThread extends Thread {
    private static Logger log = Logger.getLogger(TerminatorThread.class);
  
    private FileTailingAdaptor adaptor = null;
  
    public TerminatorThread(FileTailingAdaptor adaptor) {
      this.adaptor = adaptor;
    }
  
    public void run() {
  
      long endTime = System.currentTimeMillis() + (10 * 60 * 1000); // now + 10
                                                                    // mins
      int count = 0;
      log.info("Terminator thread started." + adaptor.toWatch.getPath());
      try {
        while (adaptor.tailFile()) {
          if (log.isDebugEnabled()) {
            log.debug("Terminator thread:" + adaptor.toWatch.getPath()
                + " still working");
          }
          long now = System.currentTimeMillis();
          if (now > endTime) {
            log.warn("TerminatorThread should have been finished by now! count="
                + count);
            count++;
            endTime = System.currentTimeMillis() + (10 * 60 * 1000); // now + 10
                                                                     // mins
            if (count > 3) {
              log.warn("TerminatorThread should have been finished by now, stopping it now! count="
                      + count);
              break;
            }
          }
        }
      } catch (InterruptedException e) {
        log.info("InterruptedException on Terminator thread:"
            + adaptor.toWatch.getPath(), e);
      } catch (Throwable e) {
        log.warn("Exception on Terminator thread:" + adaptor.toWatch.getPath(),
                e);
      }
  
      log.info("Terminator thread finished." + adaptor.toWatch.getPath());
      try {
        adaptor.reader.close();
      } catch (Throwable ex) {
        log.debug(ExceptionUtil.getStackTrace(ex));
      }
    }
  }