/*
 * 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));
    }
  }
}