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/*
Copyright 2012 Twitter, Inc.

Licensed 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 com.twitter.ambrose.model.hadoop;

import java.util.HashMap;
import java.util.Map;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import org.apache.hadoop.mapred.Counters;
import org.apache.hadoop.mapred.Counters.Counter;

/**
 * Immutable class that represents a group of Hadoop counters along with the individual counter
 * names and values.
 *
 * @author billg
 */
@SuppressWarnings("deprecation")
public class CounterGroup {

  private String groupName;
  private String groupDisplayName;
  private Map counterInfoMap;

  public CounterGroup(Counters.Group group) {
    this.groupName = group.getName();
    this.groupDisplayName = group.getDisplayName();
    this.counterInfoMap = new HashMap();

    for (Counter counter : group) {
      CounterInfo counterInfo = new CounterInfo(counter);
      counterInfoMap.put(counterInfo.getName(), counterInfo);
    }
  }

  @JsonCreator
  public CounterGroup(@JsonProperty("groupName") String groupName,
                      @JsonProperty("groupDisplayName") String groupDisplayName,
                      @JsonProperty("counterInfoMap") Map counterInfoMap) {
    this.groupName = groupName;
    this.groupDisplayName = groupDisplayName;
    this.counterInfoMap = counterInfoMap;
  }

  public String getGroupName() { return groupName; }
  public String getGroupDisplayName() { return groupDisplayName; }
  public Map getCounterInfoMap() { return counterInfoMap; }

  public CounterInfo getCounterInfo(String name) {
    return counterInfoMap == null ? null : counterInfoMap.get(name);
  }

  public static Map counterGroupInfoMap(Counters counters) {
    Map counterGroupInfoMap = new HashMap();
    if (counters != null) {
      for (Counters.Group group : counters) {
        CounterGroup counterGroup = new CounterGroup(group);
        counterGroupInfoMap.put(counterGroup.getGroupName(), counterGroup);
      }
    }
    return counterGroupInfoMap;
  }

  /**
   * CounterInfo holds the name, displayName and value of a given counter. A counter group contains
   * multiple of these.
   */
  public static class CounterInfo {
    private String name, displayName;
    private long value;

    public CounterInfo(Counter counter) {
      this.name = counter.getName();
      this.displayName = counter.getDisplayName();
      this.value = counter.getValue();
    }

    @JsonCreator
    public CounterInfo(@JsonProperty("name") String name,
                       @JsonProperty("displayName") String displayName,
                       @JsonProperty("value") long value) {
      this.name = name;
      this.displayName = displayName;
      this.value = value;
    }

    public String getName() { return name; }
    public String getDisplayName() { return displayName; }
    public long getValue() { return value; }
  }
}