{"id":6110,"date":"2012-07-30T16:50:32","date_gmt":"2012-07-30T21:50:32","guid":{"rendered":"http:\/\/bobbeaty.com\/wp\/?p=6110"},"modified":"2012-07-31T09:00:23","modified_gmt":"2012-07-31T14:00:23","slug":"lovely-little-ruby-logger","status":"publish","type":"post","link":"https:\/\/bobbeaty.com\/wp\/archives\/6110","title":{"rendered":"Lovely Little Ruby Logger"},"content":{"rendered":"

\"Ruby\"<\/p>\n

This afternoon I wanted to create a log4j-like logger for the ruby app we're working on. I was hoping<\/em> to find a gem that did it - singleton, thread-safe, the works. What I found was that the default logger: \"logger\" is really pretty close, and it's easy to make it what we need.<\/p>\n

First, it's thread-safe. Doesn't say that in the docs, but the code has synchronize<\/tt> blocks on a mutex, and that appears<\/em> to be working, so while I can't guarantee<\/em><\/strong> that it's implemented correctly<\/em>, it appears<\/em> that it is, and that's good enough for now.<\/p>\n

Second, it's not a singleton, but that's easy to fix:<\/p>\n

  require<\/span> "singleton"<\/span>\n  require<\/span> "logger"<\/span>\n  require<\/span> "app_config"<\/span>\n \n  class<\/span> AppLog\n    include<\/span> SIngleton\n \n    def<\/span> initialize(<\/span>)<\/span>\n      # get the location to log to and the level<\/span>\n      where = AppConfig.application<\/span>.log_to<\/span> ||<\/span> "stout"<\/span>\n      level = AppConfig.application<\/span>.log_level<\/span> ||<\/span> "WARN"<\/span>\n      # now make the logger for our singleton<\/span>\n      case<\/span>\n      when<\/span> where == "stdout"<\/span>\n        self<\/span>.log<\/span> = Logger<\/span>.new<\/span>(<\/span>$stdout)<\/span>\n      when<\/span> where == "stderr"<\/span>\n        self<\/span>.log<\/span> = Logger<\/span>.new<\/span>(<\/span>$stderr)<\/span>\n      else<\/span>\n        self<\/span>.log<\/span> = Logger<\/span>.new<\/span>(<\/span>where)<\/span>\n      end<\/span>\n      # now set the log level<\/span>\n      case<\/span>\n        where level == "FATAL"<\/span>\n          self<\/span>.log<\/span>.level<\/span> = Logger<\/span>::FATAL\n        where level == "ERROR"<\/span>\n          self<\/span>.log<\/span>.level<\/span> = Logger<\/span>::ERROR\n        where level == "WARN"<\/span>\n          self<\/span>.log<\/span>.level<\/span> = Logger<\/span>::WARN\n        where level == "INFO"<\/span>\n          self<\/span>.log<\/span>.level<\/span> = Logger<\/span>::INFO\n        where level == "DEBUG"<\/span>\n          self<\/span>.log<\/span>.level<\/span> = Logger<\/span>::DEBUG\n      end<\/span>\n    end<\/span>\n  end<\/span><\/pre>\n
This can then be placed in all our code and we get singleton-based logging for next to nothing. Very nice. At the same time, we can control the logging location and level very easily in the app config file.<\/p>\n
I then took this and integrated it into the code I was working on for matching up the demand data with the merchants. It's something that we really need to do to productionize<\/em> our app, and this is an important step.<\/p>\n","protected":false},"excerpt":{"rendered":"
This afternoon I wanted to create a log4j-like logger for the ruby app we’re working on. I was hoping to find a gem that did it – singleton, thread-safe, the works. What I found was that the default logger: “logger” is really pretty close, and it’s easy to make it what we need. First, it’s […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,4],"tags":[],"class_list":["post-6110","post","type-post","status-publish","format-standard","hentry","category-coding","category-open-source-software"],"_links":{"self":[{"href":"https:\/\/bobbeaty.com\/wp\/wp-json\/wp\/v2\/posts\/6110","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bobbeaty.com\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bobbeaty.com\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bobbeaty.com\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/bobbeaty.com\/wp\/wp-json\/wp\/v2\/comments?post=6110"}],"version-history":[{"count":2,"href":"https:\/\/bobbeaty.com\/wp\/wp-json\/wp\/v2\/posts\/6110\/revisions"}],"predecessor-version":[{"id":6112,"href":"https:\/\/bobbeaty.com\/wp\/wp-json\/wp\/v2\/posts\/6110\/revisions\/6112"}],"wp:attachment":[{"href":"https:\/\/bobbeaty.com\/wp\/wp-json\/wp\/v2\/media?parent=6110"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bobbeaty.com\/wp\/wp-json\/wp\/v2\/categories?post=6110"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bobbeaty.com\/wp\/wp-json\/wp\/v2\/tags?post=6110"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}