/*
    * 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.Map.Entry;
  
  import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecord;
  import org.apache.hadoop.chukwa.extraction.engine.ChukwaRecordKey;
  import org.apache.hadoop.chukwa.inputtools.jplugin.ChukwaMetrics;
  import org.apache.hadoop.chukwa.inputtools.jplugin.GenericChukwaMetricsList;
  import org.apache.hadoop.mapred.OutputCollector;
  import org.apache.hadoop.mapred.Reporter;
  
  public class JPluginMapper extends AbstractProcessor {
    @Override
    protected void parse(String recordEntry,
        OutputCollector<ChukwaRecordKey, ChukwaRecord> output,
        Reporter reporter) throws Throwable {
      LogEntry entry = new LogEntry(recordEntry);
      String xml = entry.getBody();
      GenericChukwaMetricsList metricsList = new GenericChukwaMetricsList();
      metricsList.fromXml(xml);
      String recType = metricsList.getRecordType();
      long timestamp = metricsList.getTimestamp();
      for (ChukwaMetrics metrics : metricsList.getMetricsList()) {
        key = new ChukwaRecordKey();
        ChukwaRecord record = new ChukwaRecord();
        this.buildGenericRecord(record, null, -1l, recType);
        record.setTime(timestamp);
        key.setKey(getKey(timestamp, metrics.getKey()));
        record.add("key", metrics.getKey());
        for (Entry<String, String> attr : metrics.getAttributes().entrySet()) {
          record.add(attr.getKey(), attr.getValue());
        }
        output.collect(key, record);
      }
    }
  
    private String getKey(long ts, String metricsKey) {
      long unit = 60 * 60 * 1000;
      long rounded = (ts / unit) * unit;
      return rounded + "/" + metricsKey + "/" + ts;
    }
  }