/*
    * 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.test;
  
  
  import java.net.URI;
  import org.apache.hadoop.chukwa.ChukwaArchiveKey;
  import org.apache.hadoop.chukwa.ChunkImpl;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.io.SequenceFile;
  import org.apache.hadoop.io.Writable;
  
  public class SinkFileValidator {
  
    public static void main(String[] args) {
      String fsURL = "hdfs://localhost:9000";
      String fname;
      if (args.length < 1) {
        System.out
            .println("usage:  SinkFileValidator <filename> [filesystem URI] ");
        System.exit(0);
      }
      fname = args[0];
      if (args.length > 1)
        fsURL = args[1];
  
      Configuration conf = new Configuration();
      try {
        FileSystem fs;
        if (fsURL.equals("local"))
          fs = FileSystem.getLocal(conf);
        else
          fs = FileSystem.get(new URI(fsURL), conf);
        SequenceFile.Reader r = new SequenceFile.Reader(fs, new Path(fname), conf);
        System.out.println("key class name is " + r.getKeyClassName());
        System.out.println("value class name is " + r.getValueClassName());
  
        ChukwaArchiveKey key = new ChukwaArchiveKey();
        ChunkImpl evt = ChunkImpl.getBlankChunk();
        int events = 0;
        while (r.next(key, evt) && (events < 5)) {
          if (!Writable.class.isAssignableFrom(key.getClass()))
            System.out.println("warning: keys aren't writable");
  
          if (!Writable.class.isAssignableFrom(evt.getClass()))
            System.out.println("warning: values aren't writable");
  
          if (evt.getData().length > 1000) {
            System.out.println("got event; data: "
                + new String(evt.getData(), 0, 1000));
            System.out.println("....[truncating]");
          } else
            System.out.println("got event; data: " + new String(evt.getData()));
          events++;
        }
        System.out.println("file looks OK!");
      } catch (Exception e) {
        e.printStackTrace();
      }
  
    }
  
  }