/*
    * 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.processor.mapper;
  
  import java.util.Calendar;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Set;
  import java.util.TimeZone;
  import java.util.concurrent.ConcurrentHashMap;
  
  import org.apache.hadoop.chukwa.datacollection.writer.hbase.Annotation.Table;
  import org.apache.hadoop.chukwa.datacollection.writer.hbase.Annotation.Tables;
  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.mapred.OutputCollector;
  import org.apache.hadoop.mapred.Reporter;
  import org.apache.log4j.Logger;
  import org.json.simple.JSONObject;
  import org.json.simple.JSONValue;
  
  @Tables(annotations = { @Table(name = "JobTracker", columnFamily = "jt"),
      @Table(name = "JobTracker", columnFamily = "jvm"),
      @Table(name = "JobTracker", columnFamily = "rpc") })
  public class JobTrackerProcessor extends AbstractProcessor {
    static Map<String, Long> rateMap = new ConcurrentHashMap<String, Long>();
    static {
      long zero = 0L;
      rateMap.put("SentBytes", zero);
      rateMap.put("ReceivedBytes", zero);
      rateMap.put("rpcAuthorizationSuccesses", zero);
      rateMap.put("rpcAuthorizationFailures", zero);
      rateMap.put("RpcQueueTime_num_ops", zero);
      rateMap.put("RpcProcessingTime_num_ops", zero);
      rateMap.put("heartbeats", zero);
      rateMap.put("jobs_submitted", zero);
      rateMap.put("jobs_completed", zero);
      rateMap.put("jobs_failed", zero);
      rateMap.put("jobs_killed", zero);
      rateMap.put("maps_launched", zero);
      rateMap.put("maps_completed", zero);
      rateMap.put("maps_failed", zero);
      rateMap.put("maps_killed", zero);
      rateMap.put("reduces_launched", zero);
      rateMap.put("reduces_completed", zero);
      rateMap.put("reduces_failed", zero);
      rateMap.put("reduces_killed", zero);
      rateMap.put("gcCount", zero);
    }
  
    @Override
    protected void parse(String recordEntry,
        OutputCollector<ChukwaRecordKey, ChukwaRecord> output, Reporter reporter)
        throws Throwable {
      Logger log = Logger.getLogger(JobTrackerProcessor.class);
      long timeStamp = Calendar.getInstance(TimeZone.getTimeZone("UTC"))
          .getTimeInMillis();
  
      final ChukwaRecord mapred_jt = new ChukwaRecord();
      final ChukwaRecord jt_jvm = new ChukwaRecord();
      final ChukwaRecord jt_rpc = new ChukwaRecord();
  
      Map<String, ChukwaRecord> metricsMap = new HashMap<String, ChukwaRecord>() {
        private static final long serialVersionUID = 1L;
        {
          put("gcCount", jt_jvm);
          put("gcTimeMillis", jt_jvm);
          put("logError", jt_jvm);
          put("logFatal", jt_jvm);
          put("logInfo", jt_jvm);
          put("logWarn", jt_jvm);
          put("memHeapCommittedM", jt_jvm);
          put("memHeapUsedM", jt_jvm);
          put("threadsBlocked", jt_jvm);
          put("threadsNew", jt_jvm);
          put("threadsRunnable", jt_jvm);
          put("threadsTerminated", jt_jvm);
          put("threadsTimedWaiting", jt_jvm);
          put("threadsWaiting", jt_jvm);
  
         put("ReceivedBytes", jt_rpc);
         put("RpcProcessingTime_avg_time", jt_rpc);
         put("RpcProcessingTime_num_ops", jt_rpc);
         put("RpcQueueTime_avg_time", jt_rpc);
         put("RpcQueueTime_num_ops", jt_rpc);
         put("SentBytes", jt_rpc);
         put("rpcAuthorizationSuccesses", jt_rpc);
         put("rpcAuthorizationnFailures", jt_rpc);
       }
     };
     try {
       JSONObject obj = (JSONObject) JSONValue.parse(recordEntry);
       String ttTag = chunk.getTag("timeStamp");
       if (ttTag == null) {
         log.warn("timeStamp tag not set in JMX adaptor for jobtracker");
       } else {
         timeStamp = Long.parseLong(ttTag);
       }
       for(Entry<String, Object> entry : (Set<Entry<String, Object>>) obj.entrySet()) {
         String key = entry.getKey();
         String valueString = entry.getValue().toString();
 
         // Calculate rate for some of the metrics
         if (rateMap.containsKey(key)) {
           long oldValue = rateMap.get(key);
           long curValue = Long.parseLong(valueString);
           rateMap.put(key, curValue);
           long newValue = curValue - oldValue;
           if (newValue < 0) {
             log.warn("JobTrackerProcessor's rateMap might be reset or corrupted for metric "
                 + key);
             newValue = 0L;
           }
           valueString = Long.toString(newValue);
         }
 
         // These metrics are string types with JSON structure. So we parse them
         // and get the count
         if (key.indexOf("Json") >= 0) {
           // ignore these for now. Parsing of JSON array is throwing class cast
           // exception.
         } else if (metricsMap.containsKey(key)) {
           ChukwaRecord rec = metricsMap.get(key);
           rec.add(key, valueString);
         } else {
           mapred_jt.add(key, valueString);
         }
       }
 
       buildGenericRecord(mapred_jt, null, timeStamp, "jt");
       output.collect(key, mapred_jt);
       buildGenericRecord(jt_jvm, null, timeStamp, "jvm");
       output.collect(key, jt_jvm);
       buildGenericRecord(jt_rpc, null, timeStamp, "rpc");
       output.collect(key, jt_rpc);
     } catch (Exception e) {
       log.error(ExceptionUtil.getStackTrace(e));
     }
   }
 }