/*
    * 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.extraction.demux;
  
  
  import java.io.File;
  import java.io.IOException;
  import java.text.SimpleDateFormat;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.hadoop.chukwa.ChukwaArchiveKey;
  import org.apache.hadoop.chukwa.ChunkImpl;
  import org.apache.hadoop.chukwa.conf.ChukwaConfiguration;
  import org.apache.hadoop.chukwa.extraction.demux.processor.ChukwaOutputCollector;
  import org.apache.hadoop.chukwa.extraction.demux.processor.mapper.MapProcessor;
  import org.apache.hadoop.chukwa.extraction.demux.processor.mapper.MapProcessorFactory;
  import org.apache.hadoop.chukwa.extraction.demux.processor.reducer.ReduceProcessorFactory;
  import org.apache.hadoop.chukwa.extraction.demux.processor.reducer.ReduceProcessor;
  import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecord;
  import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecordKey;
  import org.apache.hadoop.chukwa.util.ExceptionUtil;
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.conf.Configured;
  import org.apache.hadoop.filecache.DistributedCache;
  import org.apache.hadoop.fs.FileStatus;
  import org.apache.hadoop.fs.FileSystem;
  import org.apache.hadoop.fs.Path;
  import org.apache.hadoop.mapred.FileInputFormat;
  import org.apache.hadoop.mapred.FileOutputFormat;
  import org.apache.hadoop.mapred.JobClient;
  import org.apache.hadoop.mapred.JobConf;
  import org.apache.hadoop.mapred.JobPriority;
  import org.apache.hadoop.mapred.MapReduceBase;
  import org.apache.hadoop.mapred.Mapper;
  import org.apache.hadoop.mapred.OutputCollector;
  import org.apache.hadoop.mapred.Reducer;
  import org.apache.hadoop.mapred.Reporter;
  import org.apache.hadoop.mapred.SequenceFileInputFormat;
  import org.apache.hadoop.util.Tool;
  import org.apache.hadoop.util.ToolRunner;
  import org.apache.log4j.Logger;
  
  public class Demux extends Configured implements Tool {
    static Logger log = Logger.getLogger(Demux.class);
    static SimpleDateFormat day = new java.text.SimpleDateFormat("yyyyMMdd_HH_mm");
    public static Configuration jobConf = null;
  
    public static class MapClass extends MapReduceBase implements
            Mapper<ChukwaArchiveKey, ChunkImpl, ChukwaRecordKey, ChukwaRecord> {
  
      @Override
      public void configure(JobConf jobConf) {
        super.configure(jobConf);
        Demux.jobConf = jobConf;
      }
  
      public void map(ChukwaArchiveKey key, ChunkImpl chunk,
                      OutputCollector<ChukwaRecordKey, ChukwaRecord> output, Reporter reporter)
              throws IOException {
  
        ChukwaOutputCollector chukwaOutputCollector = new ChukwaOutputCollector(
                "DemuxMapOutput", output, reporter);
        try {
          long duration = System.currentTimeMillis();
          if (log.isDebugEnabled()) {
            log.debug("Entry: [" + chunk.getData() + "] EventType: ["
                    + chunk.getDataType() + "]");
          }
  
          String defaultProcessor = Demux.jobConf.get(
                  "chukwa.demux.mapper.default.processor",
                  "org.apache.hadoop.chukwa.extraction.demux.processor.mapper.DefaultProcessor");
  
          String processorClass_pri = Demux.jobConf.get(chunk.getDataType(),
                  defaultProcessor);
  
          String processorClass = processorClass_pri.split(",")[0];
          if (!processorClass.equalsIgnoreCase("Drop")) {
            reporter.incrCounter("DemuxMapInput", "total chunks", 1);
            reporter.incrCounter("DemuxMapInput",
                   chunk.getDataType() + " chunks", 1);
 
           MapProcessor processor = MapProcessorFactory
                   .getProcessor(processorClass);
           processor.process(key, chunk, chukwaOutputCollector, reporter);
           if (log.isDebugEnabled()) {
             duration = System.currentTimeMillis() - duration;
             log.debug("Demux:Map dataType:" + chunk.getDataType()
                     + " duration:" + duration + " processor:" + processorClass
                     + " recordCount:" + chunk.getRecordOffsets().length);
           }
 
         } else {
           log.info("action:Demux, dataType:" + chunk.getDataType()
                   + " duration:0 processor:Drop recordCount:"
                   + chunk.getRecordOffsets().length);
         }
 
       } catch (Exception e) {
         log.warn("Exception in Demux:MAP", e);
         e.printStackTrace();
       }
     }
   }
 
   public static class ReduceClass extends MapReduceBase implements
           Reducer<ChukwaRecordKey, ChukwaRecord, ChukwaRecordKey, ChukwaRecord> {
 
     public void configure(JobConf jobConf) {
       super.configure(jobConf);
       Demux.jobConf = jobConf;
     }
 
     public void reduce(ChukwaRecordKey key, Iterator<ChukwaRecord> values,
                        OutputCollector<ChukwaRecordKey, ChukwaRecord> output, Reporter reporter)
             throws IOException {
       ChukwaOutputCollector chukwaOutputCollector = new ChukwaOutputCollector(
               "DemuxReduceOutput", output, reporter);
       try {
         long duration = System.currentTimeMillis();
         reporter.incrCounter("DemuxReduceInput", "total distinct keys", 1);
         reporter.incrCounter("DemuxReduceInput", key.getReduceType()
                 + " total distinct keys", 1);
 
         String defaultProcessor_classname = "org.apache.hadoop.chukwa.extraction.demux.processor.reducer" +
                 ".IdentityReducer";
         String defaultProcessor = Demux.jobConf.get("chukwa.demux.reducer.default.processor",
                 "," + defaultProcessor_classname);
 
         String processClass_pri = Demux.jobConf.get(key.getReduceType(), defaultProcessor);
         String[] processClass_tmps = processClass_pri.split(",");
         String processClass = null;
         if (processClass_tmps.length != 2)
           processClass = defaultProcessor_classname;
         else
           processClass = processClass_tmps[1];
 
         ReduceProcessor processor = ReduceProcessorFactory.getProcessor(processClass);
         System.out.println(processor.getClass().getName());
         processor.process(key, values, chukwaOutputCollector, reporter);
 
         if (log.isDebugEnabled()) {
           duration = System.currentTimeMillis() - duration;
           log.debug("Demux:Reduce, dataType:" + key.getReduceType()
                   + " duration:" + duration);
         }
 
       } catch (Exception e) {
         log.warn("Exception in Demux:Reduce", e);
         e.printStackTrace();
       }
     }
   }
 
   static int printUsage() {
     System.out.println("Demux [-m <maps>] [-r <reduces>] <input> <output>");
     ToolRunner.printGenericCommandUsage(System.out);
     return -1;
   }
 
   public static void addParsers(Configuration conf) {
     String parserPath = conf.get("chukwa.data.dir") + File.separator + "demux";
     try {
       FileSystem fs = FileSystem.get(new Configuration());
       FileStatus[] fstatus = fs.listStatus(new Path(parserPath));
       if (fstatus != null) {
         String hdfsUrlPrefix = conf.get("fs.default.name");
 
         for (FileStatus parser : fstatus) {
           Path jarPath = new Path(parser.getPath().toString().replace(hdfsUrlPrefix, ""));
           log.debug("Adding parser JAR path " + jarPath);
           DistributedCache.addFileToClassPath(jarPath, conf);
         }
       }
     } catch (IOException e) {
       log.error(ExceptionUtil.getStackTrace(e));
     }
   }
 
   public int run(String[] args) throws Exception {
     JobConf conf = new JobConf(new ChukwaConfiguration(), Demux.class);
 
 
     conf.setJobName("Chukwa-Demux_" + day.format(new Date()));
     conf.setInputFormat(SequenceFileInputFormat.class);
     conf.setMapperClass(Demux.MapClass.class);
     conf.setPartitionerClass(ChukwaRecordPartitioner.class);
     conf.setReducerClass(Demux.ReduceClass.class);
 
     conf.setOutputKeyClass(ChukwaRecordKey.class);
     conf.setOutputValueClass(ChukwaRecord.class);
     conf.setOutputFormat(ChukwaRecordOutputFormat.class);
     conf.setJobPriority(JobPriority.VERY_HIGH);
     addParsers(conf);
 
     List<String> other_args = new ArrayList<String>();
     for (int i = 0; i < args.length; ++i) {
       try {
         if ("-m".equals(args[i])) {
           conf.setNumMapTasks(Integer.parseInt(args[++i]));
         } else if ("-r".equals(args[i])) {
           conf.setNumReduceTasks(Integer.parseInt(args[++i]));
         } else {
           other_args.add(args[i]);
         }
       } catch (NumberFormatException except) {
         System.out.println("ERROR: Integer expected instead of " + args[i]);
         return printUsage();
       } catch (ArrayIndexOutOfBoundsException except) {
         System.out.println("ERROR: Required parameter missing from "
                 + args[i - 1]);
         return printUsage();
       }
     }
     // Make sure there are exactly 2 parameters left.
     if (other_args.size() != 2) {
       System.out.println("ERROR: Wrong number of parameters: "
               + other_args.size() + " instead of 2.");
       return printUsage();
     }
 
     FileInputFormat.setInputPaths(conf, other_args.get(0));
     FileOutputFormat.setOutputPath(conf, new Path(other_args.get(1)));
 
     JobClient.runJob(conf);
     return 0;
   }
 
   public static void main(String[] args) throws Exception {
     int res = ToolRunner.run(new Configuration(), new Demux(), args);
     System.exit(res);
   }
 
 }