/*
    * 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.Iterator;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Set;
  
  import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecord;
  import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecordKey;
  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;
  
  public class Log4JMetricsContextProcessor extends AbstractProcessor {
  
    static Logger log = Logger.getLogger(Log4JMetricsContextProcessor.class);
  
    @Override
    protected void parse(String recordEntry,
        OutputCollector<ChukwaRecordKey, ChukwaRecord> output, Reporter reporter)
        throws Throwable 
    {
      Log4JMetricsContextChukwaRecord record = new Log4JMetricsContextChukwaRecord(recordEntry);
      ChukwaRecord chukwaRecord = record.getChukwaRecord();
      this.buildGenericRecord(chukwaRecord, null, record.getTimestamp(), record.getRecordType());
      output.collect(key, chukwaRecord);
    }
  
    // create a static class to cove most of the code for unit test 
    static class Log4JMetricsContextChukwaRecord {
      private String recordType = null;
      private long timestamp = 0;
      private ChukwaRecord chukwaRecord = new ChukwaRecord();
      
      @SuppressWarnings("unchecked")
      public Log4JMetricsContextChukwaRecord(String recordEntry) throws Throwable {
        LogEntry log = new LogEntry(recordEntry);
        JSONObject json = (JSONObject) JSONValue.parse(log.getBody());
  
        // round timestamp
        timestamp = (Long) json.get("timestamp");
        timestamp = (timestamp / 60000) * 60000;
  
        // get record type
        String contextName = (String) json.get("contextName");
        String recordName = (String) json.get("recordName");
        recordType = contextName;
        if (!contextName.equals(recordName)) {
          recordType += "_" + recordName;
        }
  
        for(Entry<String, Object> entry : (Set<Map.Entry>) json.entrySet()) {
          String key = entry.getKey();
          String value = String.valueOf(entry.getValue());
          if(value != null) {
            chukwaRecord.add(key, value);
          }
        }
      }
  
      public String getRecordType() {
        return recordType;
      }
  
      public long getTimestamp() {
        return timestamp;
      }
      
      public ChukwaRecord getChukwaRecord() {
        return chukwaRecord;
      }
    }
  }