YWatch.java

/*
 * 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.io.IOException;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
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.JSONException;
import org.json.JSONObject;

public class YWatch extends AbstractProcessor {
  static Logger log = Logger.getLogger(YWatch.class);

  private static final String ywatchType = "YWatch";

  private static String regex = null;

  private static Pattern p = null;

  private Matcher matcher = null;

  public YWatch() {
    // TODO move that to config
    regex = "([0-9]{4}\\-[0-9]{2}\\-[0-9]{2} [0-9]{2}\\:[0-9]{2}:[0-9]{2},[0-9]{3}) (INFO|DEBUG|ERROR|WARN) (.*?): (.*)";
    p = Pattern.compile(regex);
    matcher = p.matcher("-");
  }

  @SuppressWarnings("unchecked")
  @Override
  protected void parse(String recordEntry,
      OutputCollector<ChukwaRecordKey, ChukwaRecord> output, Reporter reporter)
      throws Throwable {
    if (log.isDebugEnabled()) {
      log.debug("YWatchProcessor record: [" + recordEntry + "] type["
          + chunk.getDataType() + "]");
    }

    matcher.reset(recordEntry);
    if (matcher.matches()) {
      log.info("YWatchProcessor Matches");

      try {
        String body = matcher.group(4);

        try {
          JSONObject json = new JSONObject(body);

          String poller = json.getString("poller");
          String host = json.getString("host");
          String metricName = json.getString("metricName");

          // Data
          JSONObject jsonData = json.getJSONObject("data")
              .getJSONObject("data");

          String jsonTs = null;
          long ts = Long.parseLong(jsonTs);

          String jsonValue = null;
          Iterator<String> it = jsonData.keys();

          ChukwaRecord record = null;

          while (it.hasNext()) {
            jsonTs = it.next();
            jsonValue = jsonData.getString(jsonTs);

            record = new ChukwaRecord();
            key = new ChukwaRecordKey();
            this.buildGenericRecord(record, null, ts, "Ywatch");
            record.add("poller", poller);
            record.add("host", host);
            record.add("metricName", metricName);
            record.add("value", jsonValue);
            output.collect(key, record);
            log.info("YWatchProcessor output 1 metric");
          }

        } catch (IOException e) {
          log.warn("Unable to collect output in YWatchProcessor ["
              + recordEntry + "]", e);
          e.printStackTrace();
        } catch (JSONException e) {
          e.printStackTrace();
          log.warn("Wrong format in YWatchProcessor [" + recordEntry + "]", e);
        }

      } catch (Exception e) {
        e.printStackTrace();
        throw e;
      }
    }
  }

  public String getDataType() {
    return YWatch.ywatchType;
  }
}