#!/usr/bin/env python
# -*- encoding: utf-8 -*-

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#  to you under the Apache License, Version 2.0 (the
#  "License"); you may not use this file except in compliance
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#
#    http://www.apache.org/licenses/LICENSE-2.0
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""" Singleton class which exposes a simple globally available counter for heron jobs.

It serves the same functionality as GlobalMetrics.java
"""
import threading
from heronpy.api.metrics import MultiCountMetric

metricsContainer = MultiCountMetric()
registered = False
root_name = '__auto__'

lock = threading.Lock()

def incr(key, to_add=1):
  metricsContainer.incr(key, to_add)

def safe_incr(key, to_add=1):
  with lock:
    metricsContainer.incr(key, to_add)

def init(metrics_collector, metrics_bucket):
  with lock:
    global registered
    if not registered:
      metrics_collector.register_metric(root_name, metricsContainer, metrics_bucket)
      registered = True