Rename Evil Metrics to Yabeda

Author: Envek

Gemfile

@@ -4,7 +4,7 @@ source "https://rubygems.org"
 
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
-# Specify your gem's dependencies in evil-metrics.gemspec
+# Specify your gem's dependencies in yabeda.gemspec
 gemspec
 
 group :development, :test do

README.md

@@ -1,4 +1,4 @@
-# Evil::Metrics
+# Yabeda
 
 **This software is Work in Progress: features will appear and disappear, API will be changed, your feedback is always welcome!** 
 
@@ -9,9 +9,9 @@ Extensible solution for easy setup of monitoring in your Ruby apps.
 Most of the time you don't need to add this gem to your Gemfile directly (unless you're only collecting your custom metrics):
 
 ```ruby
-gem 'evil-metrics'
+gem 'yabeda'
 # Then add monitoring system adapter, e.g.:
-# gem 'evil-metrics-prometheus'
+# gem 'yabeda-prometheus'
 ```
 
 And then execute:
@@ -23,7 +23,7 @@ And then execute:
  1. Declare your metrics:
 
     ```ruby
-    Evil::Metrics.configure do
+    Yabeda.configure do
       group :your_app
 
       counter   :bells_rang_count, "Total number of bells being rang"
@@ -38,19 +38,19 @@ And then execute:
     def ring_the_bell(id)
       bell = Bell.find(id)
       bell.ring!
-      Evil::Metrics.your_app_bells_rang_count.increment({bell_size: bell.size}, by: 1)
+      Yabeda.your_app_bells_rang_count.increment({bell_size: bell.size}, by: 1)
     end
 
     def whistle!
-      Evil::Metrics.your_app_whistle_runtime.measure do
+      Yabeda.your_app_whistle_runtime.measure do
         # Run your code
       end
     end
     ```
 
  3. Setup collecting of metrics that do not tied to specific events in you application. E.g.: reporting your app's current state
     ```ruby
-    Evil::Metrics.configure do
+    Yabeda.configure do
       # This block will be executed periodically few times in a minute
       # (by timer or external request depending on adapter you're using) 
       # Keep it fast and simple!
@@ -93,7 +93,7 @@ To install this gem onto your local machine, run `bundle exec rake install`. To
 
 ## Contributing
 
-Bug reports and pull requests are welcome on GitHub at https://github.com/evil-metrics/evil-metrics.
+Bug reports and pull requests are welcome on GitHub at https://github.com/yabeda-rb/yabeda.
 
 ## License
 

bin/console

@@ -2,7 +2,7 @@
 # frozen_string_literal: true
 
 require "bundler/setup"
-require "evil/metrics"
+require "yabeda"
 
 # You can add fixtures and/or initialization code here to make experimenting
 # with your gem easier. You can also use a different console, if you like.

lib/evil/metrics.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require "concurrent"
+
+require "yabeda/version"
+require "yabeda/dsl"
+
+module Yabeda
+  include DSL
+
+  cattr_reader :metrics,    default: Concurrent::Hash.new
+  cattr_reader :adapters,   default: Concurrent::Hash.new
+  cattr_reader :collectors, default: Concurrent::Array.new
+
+  class << self
+    # @param [Symbol] name
+    # @param [BaseAdapter] instance
+    def register_adapter(name, instance)
+      adapters[name] = instance
+      # NOTE: Pretty sure there is race condition
+      metrics.each do |_, metric|
+        instance.register!(metric)
+      end
+    end
+  end
+end

lib/evil/metrics/base_adapter.rb

@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+module Yabeda
+  class BaseAdapter
+    def register!(metric)
+      case metric
+      when Counter   then register_counter!(metric)
+      when Gauge     then register_gauge!(metric)
+      when Histogram then register_histogram!(metric)
+      else raise "#{metric.class} is unknown metric type"
+      end
+    end
+
+    def register_counter!(_metric)
+      raise NotImplementedError, "#{self.class} doesn't support counters as metric type!"
+    end
+
+    def perform_counter_increment!(_counter, _tags, _increment)
+      raise NotImplementedError, "#{self.class} doesn't support incrementing counters"
+    end
+
+    def register_gauge!(_metric)
+      raise NotImplementedError, "#{self.class} doesn't support gauges as metric type!"
+    end
+
+    def perform_gauge_set!(_metric, _tags, _value)
+      raise NotImplementedError, "#{self.class} doesn't support setting gauges"
+    end
+
+    def register_histogram!(_metric)
+      raise NotImplementedError, "#{self.class} doesn't support histograms as metric type!"
+    end
+
+    def perform_histogram_measure!(_metric, _tags, _value)
+      raise NotImplementedError, "#{self.class} doesn't support measuring histograms"
+    end
+  end
+end

lib/evil/metrics/counter.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+module Yabeda
+  # Growing-only counter
+  class Counter < Metric
+    def increment(tags, by: 1)
+      values[tags] += by
+      ::Yabeda.adapters.each do |_, adapter|
+        adapter.perform_counter_increment!(self, tags, by)
+      end
+      values[tags]
+    end
+
+    def values
+      @values ||= Concurrent::Hash.new(0)
+    end
+  end
+end