/*
    * 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.nio.charset.Charset;
  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);
        }
        @SuppressWarnings("unchecked")
        Iterator<Map.Entry<String, ?>> keys = obj.entrySet().iterator();
  
        while (keys.hasNext()) {
          Map.Entry<String, ?> entry = keys.next();
          String key = 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(Charset.forName("UTF-8")));
          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));
     }
   }
 }