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.asterix.external.input.stream;
  
  import static org.apache.asterix.common.exceptions.ErrorCode.INPUT_RECORD_READER_CHAR_ARRAY_RECORD_TOO_LARGE;
  import static org.apache.asterix.common.exceptions.ErrorCode.RECORD_READER_MALFORMED_INPUT_STREAM;
  import static org.apache.hyracks.api.exceptions.ErrorCode.PARSING_ERROR;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  
  import org.apache.asterix.external.dataflow.AbstractFeedDataFlowController;
  import org.apache.asterix.external.util.FileSystemWatcher;
  import org.apache.asterix.external.util.IFeedLogManager;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  
  public class LocalFSInputStream extends AbstractMultipleInputStream {
  
      private static final Logger LOGGER = LogManager.getLogger();
      private final FileSystemWatcher watcher;
      private File currentFile;
      private String lastFileName = "";
  
      public LocalFSInputStream(FileSystemWatcher watcher) {
          this.watcher = watcher;
      }
  
      @Override
      public void setController(AbstractFeedDataFlowController controller) {
          super.setController(controller);
      }
  
      @Override
      public void setFeedLogManager(IFeedLogManager logManager) throws HyracksDataException {
          super.setFeedLogManager(logManager);
          watcher.setFeedLogManager(logManager);
      }
  
      @Override
      public void close() throws IOException {
          IOException ioe = null;
          if (in != null) {
              try {
                  closeFile();
              } catch (Exception e) {
                  ioe = new IOException(e);
              }
          }
          try {
              watcher.close();
          } catch (Exception e) {
              if (ioe == null) {
                  throw e;
              }
              ioe.addSuppressed(e);
              throw ioe;
          }
      }
  
      private void closeFile() throws IOException {
          if (in != null) {
              if (logManager != null) {
                  logManager.endPartition(currentFile.getAbsolutePath());
              }
              try {
                  in.close();
              } finally {
                  in = null;
                  currentFile = null;
              }
          }
      }
  
      @Override
      protected boolean advance() throws IOException {
          String tmpLastFileName = "";
          if (currentFile != null) {
              tmpLastFileName = currentFile.getPath();
          }
          closeFile();
          currentFile = watcher.poll();
          if (currentFile == null) {
              if (controller != null) {
                  controller.flush();
              }
              currentFile = watcher.take();
          }
          if (currentFile != null) {
              in = new FileInputStream(currentFile);
              lastFileName = tmpLastFileName;
              if (notificationHandler != null) {
                  notificationHandler.notifyNewSource();
              }
              return true;
          }
          return false;
      }
  
      @Override
      public boolean stop() throws Exception {
          closeFile();
          watcher.close();
          return true;
      }
  
      @Override
      public boolean handleException(Throwable th) {
          if (in == null) {
              return false;
          }
          Throwable root = org.apache.hyracks.api.util.ExceptionUtils.getRootCause(th);
          if (root instanceof HyracksDataException) {
              HyracksDataException r = (HyracksDataException) root;
              boolean advance = false;
              if (r.matchesAny(RECORD_READER_MALFORMED_INPUT_STREAM, PARSING_ERROR)) {
                  logCorruptedInput();
                  advance = true;
              } else if (r.matches(INPUT_RECORD_READER_CHAR_ARRAY_RECORD_TOO_LARGE)) {
                  advance = true;
              }
              if (advance) {
                  try {
                      advance();
                      return true;
                  } catch (Exception e) {
                      LOGGER.log(Level.WARN, "An exception was thrown while trying to skip a file", e);
                  }
              }
          }
          LOGGER.log(Level.WARN, "Failed to recover from failure", th);
          return false;
      }
  
      @Override
      public String getStreamName() {
          return currentFile == null ? "" : currentFile.getPath();
      }
  
      @Override
      public String getPreviousStreamName() {
          return lastFileName;
      }
  
      private void logCorruptedInput() {
          if (currentFile != null) {
              try {
                  logManager.logRecord(currentFile.getAbsolutePath(), "Corrupted input file");
              } catch (IOException e) {
                  LOGGER.log(Level.WARN, "Filed to write to feed log file", e);
              }
              LOGGER.log(Level.WARN, "Corrupted input file: " + currentFile.getAbsolutePath());
          }
      }
  }
  