/*
    * 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.hbase;
  
  import java.nio.charset.Charset;
  import java.security.NoSuchAlgorithmException;
  import java.util.Iterator;
  import java.util.Map;
  import java.util.Set;
  import java.util.Map.Entry;
  
  import org.apache.log4j.Logger;
  import org.json.simple.JSONObject;
  import org.json.simple.JSONValue;
  
  public class HadoopMetricsProcessor extends AbstractProcessor {
    
    static Logger LOG = Logger.getLogger(HadoopMetricsProcessor.class);
    static final String timestampField = "timestamp";
    static final String contextNameField = "contextName";
    static final String recordNameField = "recordName";
    static final String hostName = "Hostname";
    static final String processName = "ProcessName";
    static final byte[] cf = "t".getBytes(Charset.forName("UTF-8"));
  
    public HadoopMetricsProcessor() throws NoSuchAlgorithmException {
    }
  
    @Override
    protected void parse(byte[] recordEntry) throws Throwable {
        String body = new String(recordEntry, Charset.forName("UTF-8"));
        int start = body.indexOf('{');
        JSONObject json = (JSONObject) JSONValue.parse(body.substring(start));
  
        time = ((Long) json.get(timestampField)).longValue();
        String contextName = (String) json.get(contextNameField);
        String recordName = (String) json.get(recordNameField);
        String src = ((String) json.get(hostName)).toLowerCase();
        if(json.get(processName)!=null) {
          src = new StringBuilder(src).append(":").append(json.get(processName)).toString();
        }
        for(Entry<String, Object> entry : (Set<Map.Entry>) json.entrySet()) {
          String keyName = entry.getKey();
          if (timestampField.intern() == keyName.intern()) {
            continue;
          } else if (contextNameField.intern() == keyName.intern()) {
            continue;
          } else if (recordNameField.intern() == keyName.intern()) {
            continue;
          } else if (hostName.intern() == keyName.intern()) {
            continue;
          } else if (processName.intern() == keyName.intern()) {
            continue;
          } else {
            if(json.get(keyName)!=null) {
              String v = entry.getValue().toString();
              String primaryKey = new StringBuilder(contextName).append(".")
                  .append(recordName).append(".").append(keyName).toString();
              addRecord(time, primaryKey, src, v.getBytes(Charset.forName("UTF-8")), output);
            }
          }
        }
    }
  
  }