/*
    * 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.TreeMap;
  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.hadoop.record.Buffer;
  import org.apache.log4j.Logger;
  import org.json.simple.JSONObject;
  import org.json.simple.JSONValue;
  
  @Tables(annotations={
  @Table(name="HBase",columnFamily="master")
  })
  public class HBaseMasterProcessor extends AbstractProcessor{
  	static Map<String, Long> rateMap = new ConcurrentHashMap<String,Long>();
  	static {
  		long zero = 0L;	
  		rateMap.put("splitSizeNumOps", zero);
  		rateMap.put("splitTimeNumOps", zero);
  	}
  	
  	@Override
  	protected void parse(String recordEntry,
  			OutputCollector<ChukwaRecordKey, ChukwaRecord> output,
  			Reporter reporter) throws Throwable {
  		
  		Logger log = Logger.getLogger(HBaseMasterProcessor.class); 
  		long timeStamp = Calendar.getInstance(TimeZone.getTimeZone("UTC")).getTimeInMillis();
  		ChukwaRecord record = new ChukwaRecord();
  		
  		Map<String, Buffer> metricsMap = new HashMap<String,Buffer>();
  
  		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 hbase master");
  			}
  			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("HBaseMaster rateMap might be reset or corrupted for metric "+key);						
  						newValue = 0L;
  					}					
  					valueString = Long.toString(newValue);
  				}
  				
  				Buffer b = new Buffer(valueString.getBytes());
  				metricsMap.put(key,b);				
  			}			
  			
  			TreeMap<String, Buffer> t = new TreeMap<String, Buffer>(metricsMap);
  			record.setMapFields(t);			
  			buildGenericRecord(record, null, timeStamp, "master");
 			output.collect(key, record);
 		}
 		catch(Exception e){
 			log.error(ExceptionUtil.getStackTrace(e));
 		}		
 	}	
 }