/*
    * 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.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);
 			}
 			Iterator<JSONObject> iter = obj.entrySet().iterator();
 			
 			while(iter.hasNext()){
 				Map.Entry entry = (Map.Entry)iter.next();
 				String key = (String) entry.getKey();
 				Object value = entry.getValue();
 				String valueString = value == null?"":value.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));
 		}
 	}
 }