{"id":19387,"date":"2017-03-08T19:19:47","date_gmt":"2017-03-08T10:19:47","guid":{"rendered":"http:\/\/www.sejuku.net\/blog\/?p=19387"},"modified":"2024-05-06T11:40:45","modified_gmt":"2024-05-06T02:40:45","slug":"%e3%80%903%e5%88%86%e5%85%a5%e9%96%80%e3%80%91ruby-logger%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/19387","title":{"rendered":"\u3010Ruby\u5165\u9580\u3011logger\u306e\u4f7f\u3044\u65b9\u307e\u3068\u3081"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01Web\u30b3\u30fc\u30c0\u30fc\u30fb\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u8c9d\u539f\uff08<a href=\"https:\/\/twitter.com\/touhicomu\" target=\"_blank\" rel=\"noopener\">@touhicomu<\/a>\uff09\u3067\u3059\u3002<\/p>\n<p>\u4eca\u65e5\u306f\u3001<span style=\"color: #339966\"><strong>Ruby<\/strong><\/span>\u306e<span style=\"color: #339966\"><strong>log\u3001logger<\/strong><\/span>\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001<\/p>\n<ul>\n<li><span style=\"color: #ff0000\"><strong>log\u3001logger\u306b\u3064\u3044\u3066<\/strong><\/span><\/li>\n<li><span style=\"color: #ff0000\"><strong>log\u51fa\u529b\u30ec\u30d9\u30eb\u3068\u306f<\/strong><\/span><\/li>\n<li><span style=\"color: #ff0000\"><strong>\u57fa\u672c\u7684\u306alog\u306e\u51fa\u529b\u65b9\u6cd5<\/strong><\/span><\/li>\n<li><span style=\"color: #ff0000\"><strong>\u30ed\u30b0\u306e\u51fa\u529b\u5148\u6307\u5b9a <\/strong><\/span><\/li>\n<li><span style=\"color: #ff0000\"><strong>\u30ed\u30b0\u30ec\u30d9\u30eb\u306e\u6307\u5b9a\u65b9\u6cd5<\/strong><\/span><\/li>\n<li><span style=\"color: #ff0000\"><strong>\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306b\u6539\u884c\u3092\u3064\u3051\u3066\u30ed\u30b0\u51fa\u529b<\/strong><\/span><\/li>\n<li><span style=\"color: #ff0000\"><strong>\u30ed\u30b0\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u6307\u5b9a<\/strong><\/span><\/li>\n<li><span style=\"color: #ff0000\"><strong>\u30ed\u30b0\u306e\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3<\/strong><\/span><\/li>\n<\/ul>\n<p>\u3068\u3044\u3046\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u3001<\/p>\n<ul>\n<li><span style=\"color: #ff0000\"><strong>datetime_format\u306b\u3088\u308b\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/strong><\/span><\/li>\n<li><span style=\"color: #ff0000\"><strong>log\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u6307\u5b9a\u65b9\u6cd5<\/strong><\/span><\/li>\n<li><span style=\"color: #ff0000\"><strong>logger\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u306e\u4f8b<\/strong><\/span><\/li>\n<\/ul>\n<p>\u306a\u3069\u306e\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\u306b\u95a2\u3057\u3066\u3082\u5b66\u7fd2\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30da\u30fc\u30b8\u3067\u3001<span style=\"color: #339966\"><strong>Ruby<\/strong><\/span>\u306e<span style=\"color: #339966\"><strong>log\u3001logger<\/strong><\/span>\u306e\u4f7f\u3044\u65b9\u3092\u3088\u304f\u628a\u63e1\u3057\u3066\u81ea\u5206\u306e\u30b9\u30ad\u30eb\u3068\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<h2>log\u3001logger\u306b\u3064\u3044\u3066<\/h2>\n<h3>log\u3068\u306f<\/h3>\n<p><span style=\"color: #339966\"><strong>log<\/strong><\/span>\u3068\u306fRuby\u306e\u5b9f\u884c\u4e2d\u306b\u3001<span style=\"color: #0000ff\"><strong>\u9014\u4e2d\u7d4c\u904e\u3084\u51e6\u7406\u7d50\u679c<\/strong><\/span>\u306a\u3069\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u306b\u66f8\u304d\u8fbc\u3093\u3060\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>log\u306f\u4e3b\u306b<span style=\"color: #0000ff\"><strong>\u30d0\u30b0\u3084\u30a8\u30e9\u30fc\u306e\u89e3\u6c7a\u3001\u30c7\u30d0\u30c3\u30b0<\/strong><\/span>\u306a\u3069\u306b\u4f7f\u7528\u3055\u308c\u3001web\u30a2\u30d7\u30ea\u306e\u958b\u767a\u306a\u3069\u3067\u306f\u3068\u308a\u3042\u3048\u305alog\u3092\u898b\u308c\u3070\u3001\u554f\u984c\u306e\u5927\u65b9\u306e\u63a8\u6e2c\u306f\u3064\u304f\u307b\u3069\u306e\u512a\u308c\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>log\u306f\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u8868\u793a\uff08\u51fa\u529b\uff09\u3092\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \"># Logfile created on 2017-09-21 11:15:52 +0900 by logger.rb\/56815\r\nW, [2017-09-21T11:15:52.517941 #8136]  WARN -- : \u30ed\u30b03\r\nW, [2017-09-21T11:16:49.831474 #26884]  WARN -- : \u30ed\u30b03<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001<\/p>\n<ul>\n<li>\u30ed\u30b0\u3092\u51fa\u529b\u3057\u305f\u65e5\u4ed8<\/li>\n<li>\u30ed\u30b0\u3092\u51fa\u529b\u3057\u305fRuby\u306e\u30d7\u30ed\u30bb\u30b9\u756a\u53f7\uff08\u3053\u3053\u3067\u306f#8136\u3084#26884\uff09<\/li>\n<li>\u30ed\u30b0\u306e\u30ec\u30d9\u30eb\uff08\u3053\u3053\u3067\u306fWARN\uff1a\u8b66\u544a\uff09<\/li>\n<li>\u30ed\u30b0\u30e1\u30c3\u30bb\u30fc\u30b8\uff08\u3053\u3053\u3067\u306f\u300c\u30ed\u30b03\u300d\uff09<\/li>\n<\/ul>\n<p>\u306a\u3069\u304c\u51fa\u529b\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001<span style=\"color: #339966\"><strong>\u30d7\u30ed\u30bb\u30b9\u756a\u53f7<\/strong><\/span>\u3068\u306f\u3001OS\u306e\u5143\u3067\u52d5\u3044\u3066\u3044\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u4e00\u3064\u3072\u3068\u3064\u306b\u4ed8\u756a\u3055\u308c\u305f<span style=\"color: #339966\"><strong>ID<\/strong><\/span>\u3067\u3059\u3002<\/p>\n<p>\u30ed\u30b0\u306f<span style=\"color: #0000ff\"><strong>\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/strong><\/span>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3066\u3001\u30a8\u30e9\u30fc\u306e\u767a\u751f\u3057\u305f<span style=\"color: #339966\"><strong>\u30d5\u30a1\u30a4\u30eb\u540d<\/strong><\/span>\u3084<span style=\"color: #339966\"><strong>\u884c\u756a\u53f7<\/strong><\/span>\u3092\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001<span style=\"color: #0000ff\"><strong>\u30a8\u30e9\u30fc\u89e3\u6c7a\u3001\u30c7\u30d0\u30c3\u30b0<\/strong><\/span>\u306a\u3069\u306e\u6307\u91dd\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<h3>log\u30ec\u30d9\u30eb\u3068\u306f<\/h3>\n<p>log\u306b\u306f<span style=\"color: #339966\"><strong>log\u30ec\u30d9\u30eb<\/strong><\/span>\u3068\u547c\u3070\u308c\u308b\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>log\u30ec\u30d9\u30eb\u306b\u3088\u3063\u3066<span style=\"color: #0000ff\"><strong>log\u306e\u91cd\u8981\u5ea6<\/strong><\/span>\u304c\u5909\u308f\u3063\u3066\u304d\u3001log\u30ec\u30d9\u30eb\u306b\u3088\u3063\u3066\u51fa\u529b\u3059\u308b\u30ed\u30b0\u3092\u5206\u3051\u305f\u308a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>log\u30ec\u30d9\u30eb\u306f\u4ee5\u4e0b\u306e6\u7a2e\u985e\u306b\u5206\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n<table id=\"tablepress-182\" class=\"tablepress tablepress-id-182\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">log\u30ec\u30d9\u30eb<\/th><th class=\"column-2\">\u610f\u5473<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">UNKNOWN<\/td><td class=\"column-2\">\u5e38\u306b\u30ed\u30b0\u3068\u3057\u3066\u51fa\u529b\u3055\u308c\u308b\u5fc5\u8981\u304c\u3042\u308b\u672a\u77e5\u306e\u30e1\u30c3\u30bb\u30fc\u30b8<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">FATAL<\/td><td class=\"column-2\">\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30af\u30e9\u30c3\u30b7\u30e5\u3055\u305b\u308b\u3088\u3046\u306a\u5236\u5fa1\u4e0d\u53ef\u80fd\u306a\u30a8\u30e9\u30fc<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">ERROR<\/td><td class=\"column-2\">\u30a8\u30e9\u30fc<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">WARN<\/td><td class=\"column-2\">\u8b66\u544a<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">INFO<\/td><td class=\"column-2\">\u4e00\u822c\u7684\u306a\u60c5\u5831<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">DEBUG<\/td><td class=\"column-2\">\u4f4e\u30ec\u30d9\u30eb\u306e\u60c5\u5831<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-182 from cache -->\n<p>\u4e0a\u306b\u884c\u304f\u307b\u3069\u30ed\u30b0\u30ec\u30d9\u30eb\u304c\u9ad8\u3044\u3068\u547c\u3070\u308c\u3001<span style=\"color: #0000ff\"><strong>\u3088\u308a\u91cd\u8981\u306a\u60c5\u5831<\/strong><\/span>\u3092\u8868\u3057\u3066\u3044\u308b\u30ed\u30b0\u3092\u8868\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>logger\u3068\u306f<\/h3>\n<p><span style=\"color: #339966\"><strong>logger<\/strong><\/span>\u3068\u306f\u3001Ruby\u304b\u3089log\u3092\u51fa\u529b\u3059\u308b<span style=\"color: #0000ff\"><strong>\u30e6\u30fc\u30c6\u30a3\u30ea\u30c6\u30a3<\/strong><\/span>\u3067\u3059\u3002<\/p>\n<p>log\u51fa\u529b\u306b\u95a2\u3059\u308b\u69d8\u3005\u306a\u4fbf\u5229\u306a\u6a5f\u80fd\u3092\u642d\u8f09\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>logger\u3092\u4f7f\u7528\u3059\u308b\u306b\u306f\u3001Ruby\u306e\u30d5\u30a1\u30a4\u30eb\u5192\u982d\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b<span style=\"color: #0000ff\"><strong>\u5ba3\u8a00<\/strong><\/span>\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:ruby decode:true \">require 'logger'<\/pre>\n<p>\u307e\u305a\u306f\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:ruby decode:true \"># logger\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u8aad\u307f\u8fbc\u307f\r\nrequire 'logger'\r\n\r\n# \u30ed\u30b0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\r\nlog = Logger.new('.\/rubyflie.log')\r\n\r\n# \u5404\u30ed\u30b0\u30ec\u30d9\u30eb\u306e\u30ed\u30b0\u30e1\u30c3\u30bb\u30fc\u30b8\u3092'\/tmp\/rubyflie.log'\u306b\u51fa\u529b\r\nlog.debug('*debug log')\r\nlog.info('*info log')\r\nlog.warn('*warn log')\r\nlog.error('*error log')\r\nlog.fatal('*fatal log')\r\nlog.unknown('*unknown log')<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff08.\/rubyflie.log\uff09\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \"># Logfile created on 2017-09-21 10:59:26 +0900 by logger.rb\/56815\r\nD, [2017-09-22T10:08:39.414406 #16980] DEBUG -- : *debug log\r\nI, [2017-09-22T10:08:39.414406 #16980]  INFO -- : *info log\r\nW, [2017-09-22T10:08:39.414406 #16980]  WARN -- : *warn log\r\nE, [2017-09-22T10:08:39.414406 #16980] ERROR -- : *error log\r\nF, [2017-09-22T10:08:39.414406 #16980] FATAL -- : *fatal log\r\nA, [2017-09-22T10:08:39.414406 #16980]   ANY -- : *unknown log<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001Logger.new\u3067<span style=\"color: #339966\"><strong>logger\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/strong><\/span>\u3092\u4f5c\u6210\u3057\u305f\u5f8c\u306f\u3001logger\u306e<span style=\"color: #339966\"><strong>debug\u3001info\u3001warn\u3001error\u3001fatal\u3001unknown\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3092\u4f7f\u3063\u3066<span style=\"color: #0000ff\"><strong>\u30ed\u30b0\u30ec\u30d9\u30eb<\/strong><\/span>\u3054\u3068\u306b\u9069\u3057\u305f\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u30ed\u30b0\u304c\u51fa\u529b\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u3053\u308c\u3089\u306e\u51fa\u529b\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306flogger\u306b\u3088\u308a<span style=\"color: #0000ff\"><strong>\u30ab\u30b9\u30bf\u30de\u30a4\u30ba<\/strong><\/span>\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>logger\u306e\u51fa\u529b\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u65b9\u6cd5\u306f\u3001\u4ee5\u964d\u306e\u7ae0\u3067\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2>logger\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h2>\n<h3>\u57fa\u672c\u7684\u306alog\u306e\u51fa\u529b\u65b9\u6cd5<\/h3>\n<p><span style=\"color: #339966\"><strong>logger<\/strong><\/span>\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001\u5148\u982d\u306e\u65b9\u3067logger\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u5f8c\u3001\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u3092\u8aad\u307f\u8fbc\u307f\u3001\u30c6\u30ad\u30b9\u30c8\u30d5\u30a1\u30a4\u30eb\u306e\u5404\u884c\u30921\u884c\u305a\u3064\u8aad\u307f\u8fbc\u3093\u3067\u3044\u307e\u3059\u3002<\/p>\n<p>\u5404\u884c\u306e\u884c\u982d\u304c<span style=\"color: #0000ff\"><strong>#\u3067\u59cb\u307e\u3063\u3066\u3044\u306a\u3044<\/strong><\/span>\u5834\u5408\u306f\u3001<span style=\"color: #339966\"><strong>\u30a8\u30e9\u30fc<\/strong><\/span>\u3068\u307f\u306a\u3057\u3001logger\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u3063\u3066<span style=\"color: #0000ff\"><strong>\u30ed\u30b0\u306b\u51fa\u529b<\/strong><\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30a8\u30e9\u30fc\u3067\u306a\u3051\u308c\u3070\u3001puts\u3067\u6a19\u6e96\u51fa\u529b\u306b\u884c\u3092\u8868\u793a\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"lang:ruby decode:true \">require 'logger'\r\n\r\n# logger\u3092\u751f\u6210\u3057\u3001\u6700\u5927\u30ed\u30b0\u51fa\u529b\u30ec\u30d9\u30eb\u3092Logger::DEBUG\u306b\u9650\u5b9a\r\nlogger = Logger.new('.\/filescan.log')\r\n#logger.level = Logger::DEBUG\r\n\r\n# \u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb&quot;sample.txt&quot;\r\nfilename = &quot;sample.txt&quot;\r\n\r\nbegin\r\n\r\n  # \u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb&quot;sample.txt&quot;\u3092\u884c\u3054\u3068\u306b\u8aad\u307f\u8fbc\u3080\uff08\u30b9\u30ad\u30e3\u30f3\u3059\u308b\uff09\r\n  File.foreach(filename) do |line|\r\n  \r\n    # \u884c\u982d\u304c#\u3067\u59cb\u307e\u3063\u3066\u3044\u306a\u3051\u308c\u3070\u3001\u30a8\u30e9\u30fc\r\n    unless line.start_with?(&quot;#&quot;)\r\n    \r\n      # \u30a8\u30e9\u30fc\u3092\u30ed\u30b0\u3059\u308b\r\n      logger.error(&quot;\u30b9\u30ad\u30e3\u30f3\u30a8\u30e9\u30fc: #{line.chomp}&quot;)\r\n      \r\n    else\r\n      \r\n      # \u30a8\u30e9\u30fc\u3067\u306a\u3051\u308c\u3070\u3001\u6a19\u6e96\u51fa\u529b\u306b\u51fa\u529b\u3059\u308b\r\n      puts line\r\n    end\r\n  end\r\nrescue =&gt; err\r\n  \r\n  # \u4f8b\u5916\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u3001\u305d\u306e\u65e8\u30ed\u30b0\u3059\u308b\r\n  logger.fatal(&quot;\u4f8b\u5916\u767a\u751f\uff1a #{err.message}&quot;)\r\n  logger.fatal(err)\r\n  \r\nend<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff08.\/filescan.log\uff09\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \"># Logfile created on 2017-09-21 11:10:32 +0900 by logger.rb\/56815\r\nE, [2017-09-22T10:36:31.543668 #11228] ERROR -- : \u30b9\u30ad\u30e3\u30f3\u30a8\u30e9\u30fc: Yes, I am a coffee\r\nE, [2017-09-22T10:36:31.544169 #11228] ERROR -- : \u30b9\u30ad\u30e3\u30f3\u30a8\u30e9\u30fc: Must done encrypt!<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u30ed\u30b0\u306b\u306f\u300c\u30b9\u30ad\u30e3\u30f3\u30a8\u30e9\u30fc\u300d\u306e\u6587\u8a00\u3068\u3068\u3082\u306b\u3001\u30a8\u30e9\u30fc\u3068\u306a\u3063\u305f\u884c\u306e\u30c6\u30ad\u30b9\u30c8\u304c\u66f8\u304d\u51fa\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30ed\u30b0\u30ec\u30d9\u30eb\u306ferror\u306b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u30ed\u30b0\u306e\u51fa\u529b\u5148\u6307\u5b9a<\/h3>\n<p><span style=\"color: #339966\"><strong>\u30ed\u30b0\u306e\u51fa\u529b\u5148<\/strong><\/span>\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u51fa\u529b\u5148\u306f\u4e3b\u306b\u30d5\u30a1\u30a4\u30eb\u3067\u3059\u304c\u3001<span style=\"color: #339966\"><strong>\u6a19\u6e96\u51fa\u529b\uff08STDOUT\uff09<\/strong><\/span>\u3084<span style=\"color: #339966\"><strong>\u6a19\u6e96\u30a8\u30e9\u30fc\u51fa\u529b\uff08STDERR\uff09<\/strong><\/span>\u306a\u3092\u3082\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u969b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:ruby decode:true \">require 'logger'\r\n\r\n# \u6a19\u6e96\u51fa\u529b\u3078\u306e\u30ed\u30b0\r\nlogger1 = Logger.new(STDOUT)\r\n# \u6a19\u6e96\u30a8\u30e9\u30fc\u51fa\u529b\u3078\u306e\u30ed\u30b0\r\nlogger2 = Logger.new(STDERR)\r\n# \u30d5\u30a1\u30a4\u30eb\u3078\u306e\u30ed\u30b0\r\nlogger3 = Logger.new('tofile1.log')\r\n\r\n# \u30d5\u30a1\u30a4\u30eb\u3078\u306e\u30ed\u30b0\u6307\u5b9a\u65b9\u6cd5\u305d\u306e\uff12\r\nfile = File.open('tofile2.log', File::WRONLY | File::APPEND | File::CREAT)\r\nlogger4 = Logger.new(file)\r\n\r\n# \u5404\u7a2elogger\u3078\u66f8\u304d\u8fbc\u307f\r\nlogger1.error(&quot;\u30ed\u30b01&quot;)\r\nlogger2.info(&quot;\u30ed\u30b02&quot;)\r\nlogger3.warn(&quot;\u30ed\u30b03&quot;)\r\nlogger4.debug(&quot;\u30ed\u30b04&quot;)<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff08\u6a19\u6e96\u51fa\u529b\u30fb\u6a19\u6e96\u30a8\u30e9\u30fc\u51fa\u529b\uff09\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">E, [2017-09-22T10:39:15.593142 #10372] ERROR -- : \u30ed\u30b01\r\nI, [2017-09-22T10:39:15.593643 #10372]  INFO -- : \u30ed\u30b02<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff08tofile1.log\uff09\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \"># Logfile created on 2017-09-21 11:15:52 +0900 by logger.rb\/56815\r\nW, [2017-09-21T11:15:52.517941 #8136]  WARN -- : \u30ed\u30b03<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff08tofile2.log\uff09\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">D, [2017-09-22T10:41:28.441136 #10536] DEBUG -- : \u30ed\u30b04<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306a\u5b9f\u884c\u7d50\u679c\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u6a19\u6e96\u51fa\u529b\u3068\u6a19\u6e96\u30a8\u30e9\u30fc\u51fa\u529b\u306b\u3082\u30ed\u30b0\u3092\u51fa\u529b\u3067\u304d\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u6a19\u6e96\u51fa\u529b\u306b\u30ed\u30b0\u3092\u51fa\u529b\u3059\u308b\u5834\u5408\u306f\u3001Logger.new\u30e1\u30bd\u30c3\u30c9\u306b\u300c<span style=\"color: #339966\"><strong>STDOUT<\/strong><\/span>\u300d\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u6a19\u6e96\u30a8\u30e9\u30fc\u51fa\u529b\u306b\u30ed\u30b0\u3092\u51fa\u529b\u3059\u308b\u5834\u5408\u306f\u3001Logger.new\u30e1\u30bd\u30c3\u30c9\u306b\u300c<span style=\"color: #339966\"><strong>STDERR<\/strong><\/span>\u300d\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u30d5\u30a1\u30a4\u30eb\u306b\u30ed\u30b0\u3092\u51fa\u529b\u3059\u308b\u5834\u5408\u306f\u3001Logger.new\u30e1\u30bd\u30c3\u30c9\u306b<span style=\"color: #339966\"><strong>\u30d5\u30a1\u30a4\u30eb\u540d<\/strong><\/span>\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p><span style=\"color: #339966\"><strong>File.open\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3067\u958b\u3044\u305f\u30d5\u30a1\u30a4\u30eb\u306b\u30ed\u30b0\u3092\u51fa\u529b\u3059\u308b\u5834\u5408\u306f\u3001Logger.new\u30e1\u30bd\u30c3\u30c9\u306b\u305d\u306e<span style=\"color: #0000ff\"><strong>\u30d5\u30a1\u30a4\u30eb\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/strong><\/span>\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001File.open\u30e1\u30bd\u30c3\u30c9\u3067\u958b\u3044\u305f\u30d5\u30a1\u30a4\u30eb\u306b\u30ed\u30b0\u3092\u51fa\u529b\u3059\u308b\u5834\u5408\u306e\u307f\u3001<span style=\"color: #ff0000\"><strong>\u30ed\u30b0\u306e\u5148\u982d\u306e\u30d8\u30c3\u30c0\u30fc\u306f\u51fa\u529b\u3055\u308c\u307e\u305b\u3093\u3002<\/strong><\/span><\/p>\n<h3>\u30ed\u30b0\u30ec\u30d9\u30eb\u306e\u6307\u5b9a\u65b9\u6cd5<\/h3>\n<p>\u30ed\u30b0\u30ec\u30d9\u30eb\u306e\u6307\u5b9a\u306f\u3001<span style=\"color: #339966\"><strong>logger<\/strong><\/span>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e<span style=\"color: #339966\"><strong>error\u3001info\u3001warn\u3001debug<\/strong><\/span>\u306a\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30ed\u30b0\u30ec\u30d9\u30eb\u3092\u305d\u308c\u305e\u308c<span style=\"color: #339966\"><strong>ERROR\u3001INFO\u3001WARN\u3001DEBUG<\/strong><\/span>\u306a\u3069\u3092\u6307\u5b9a\u3057\u305f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u30ed\u30b0\u306b\u51fa\u529b\u3059\u308b<span style=\"color: #339966\"><strong>\u6700\u5927\u30ed\u30b0\u30ec\u30d9\u30eb<\/strong><\/span>\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306e\u6700\u5927\u30ed\u30b0\u30ec\u30d9\u30eb\u3092\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u5207\u308a\u66ff\u3048\u3089\u308c\u308b\u3088\u3046\u306b\u3059\u308b\u3053\u3068\u3067\u3001\u4f8b\u3048\u3070<span style=\"color: #0000ff\"><strong>\u672c\u756a\u7cfb\u306e\u30b7\u30b9\u30c6\u30e0\u3068\u30c6\u30b9\u30c8\u7cfb\u306e\u30b7\u30b9\u30c6\u30e0<\/strong><\/span>\u3067\u3001\u30ed\u30b0\u306e\u51fa\u529b\u60c5\u5831\u306e\u91cf\u3084\u8cea\u3092\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30ed\u30b0\u6700\u5927\u30ec\u30d9\u30eb\u306fLogger\u306e<span style=\"color: #339966\"><strong>level\u30d7\u30ed\u30d1\u30c6\u30a3<\/strong><\/span>\u306b<span style=\"color: #339966\"><strong>Logger\u306e\u5b9a\u6570\uff08Logger::WARN\u306a\u3069\uff09<\/strong><\/span>\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u6709\u52b9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u969b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:ruby decode:true \">require 'logger'\r\n# logger\u306e\u751f\u6210\r\nlogger = Logger.new('loglevel.log')\r\n\r\n# \u30ed\u30b0\u6700\u5927\u51fa\u529b\u30ec\u30d9\u30eb\u3092WARN\u306b\r\n# \u30ed\u30b0\u306e\u512a\u5148\u5ea6\u30ec\u30d9\u30eb\u306f\u3001DEBUG &lt; INFO &lt; WARN &lt; ERROR &lt; FATAL &lt; UNKNOWN \u306e\u9806\u306b\u306a\u308b\r\nlogger.level = Logger::WARN\r\n\r\n# \u5404\u7a2e\u30ed\u30b0\u51fa\u529b\r\nlogger.error(&quot;\u30ed\u30b01&quot;)\r\nlogger.info(&quot;\u30ed\u30b02&quot;)\r\nlogger.warn(&quot;\u30ed\u30b03&quot;)\r\nlogger.debug(&quot;\u30ed\u30b04&quot;)<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff08loglevel.log\uff09\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \"># Logfile created on 2017-09-21 11:18:31 +0900 by logger.rb\/56815\r\nE, [2017-09-21T11:18:31.563299 #27404] ERROR -- : \u30ed\u30b01\r\nW, [2017-09-21T11:18:31.563299 #27404]  WARN -- : \u30ed\u30b03\r\n<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001<span style=\"color: #339966\"><strong>level<\/strong><\/span>\u306b<span style=\"color: #339966\"><strong>Logger::WARN<\/strong><\/span>\u3092\u6307\u5b9a\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u30ed\u30b0\u306e\u512a\u5148\u5ea6\u30ec\u30d9\u30eb\u306f\u3001<span style=\"color: #0000ff\"><strong>DEBUG &lt; INFO &lt; WARN &lt; ERROR &lt; FATAL &lt; UNKNOWN<\/strong><\/span>\u306e\u9806\u306b\u306a\u308b\u305f\u3081\u3001\u4e0a\u8a18\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001DEBUG\u3068INFO\u306e\u30ed\u30b0\u306e\u60c5\u5831\u306f<span style=\"color: #ff0000\"><strong>\u51fa\u529b\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/strong><\/span><\/p>\n<p>\u307e\u305f\u3001WARN\u4ee5\u4e0a\u306e\u30ed\u30b0\u30ec\u30d9\u30eb\u3067\u3042\u308bERROR\u3068WARN\u306e\u30ed\u30b0\u306e\u60c5\u5831\u306f\u51fa\u529b\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306b\u6539\u884c\u3092\u3064\u3051\u3066\u30ed\u30b0\u51fa\u529b<\/h3>\n<p>\u30ed\u30b0\u306f\u30c7\u30d0\u30c3\u30b0\u3059\u308b\u969b\u306b\u4fbf\u5229\u306a\u60c5\u5831\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u3001\u30a8\u30e9\u30fc\u3084\u4f8b\u5916\u304c\u767a\u751f\u3057\u305f\u7b87\u6240\u306e<span style=\"color: #339966\"><strong>\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9<\/strong><\/span>\u3092\u30ed\u30b0\u306b\u51fa\u529b\u3067\u304d\u308c\u3070\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<p>\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3068\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3057\u3066\u3044\u308b\u6642\u306e\u73fe\u5728\u5730\u306e\u30e1\u30bd\u30c3\u30c9\u540d\u3084\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u60c5\u5831\u3092\u3001\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u306e\u305f\u3073\u306b\u6bb5\u3092<span style=\"color: #0000ff\"><strong>\u7a4d\u307f\u4e0a\u3052\u3066\uff08\u30b9\u30bf\u30c3\u30af\u3057\u3066\uff09<\/strong><\/span>\u4fdd\u5b58\u3057\u3066\u3044\u308b\u60c5\u5831\u306e\u3053\u3068\u3067\u3059\u3002<\/p>\n<p>\u305d\u306e\u60c5\u5831\u3092\u30c7\u30d0\u30c3\u30b0\u6642\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u3069\u306e\u30e1\u30bd\u30c3\u30c9\u3084\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306e\u60c5\u5831\u3092\u5f97\u3066\u3044\u308b\u304b<span style=\"color: #0000ff\"><strong>\u8ffd\u8de1\uff08\u30c8\u30ec\u30fc\u30b9\uff09<\/strong><\/span>\u3057\u3084\u3059\u3044\u3088\u3046\u306b\u52a0\u5de5\u3057\u305f\u3082\u306e\u3092\u3001\u7dcf\u79f0\u3057\u3066\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u3068\u8a00\u3044\u307e\u3059\u3002<\/p>\n<p>\u901a\u5e38\u3001\u4f8b\u5916\u306e\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306f<span style=\"color: #339966\"><strong>\u914d\u5217<\/strong><\/span>\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001\u914d\u5217\u306e<span style=\"color: #339966\"><strong>join\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u306b<span style=\"color: #339966\"><strong>&quot;\\n&quot;<\/strong><\/span>\u3092\u3057\u3066\u3044\u3066\u3001\u914d\u5217\u304b\u3089&quot;\\n&quot;\u3067\u533a\u5207\u3089\u308c\u305f<span style=\"color: #0000ff\"><strong>\u6587\u5b57\u5217\u306b\u5909\u63db<\/strong><\/span>\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u5916\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092err\u3068\u3059\u308b\u3068\u3001\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306f\u300c<span style=\"color: #339966\"><strong>err.backtrace.join(&quot;\\n&quot;)<\/strong><\/span>\u300d\u3067\u3001\u30b9\u30bf\u30c3\u30af\u30921\u884c\u3054\u3068\u306b\u6539\u884c\u3057\u305f\u30c6\u30ad\u30b9\u30c8\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u60c5\u5831\u3092\u30ed\u30b0\u306b\u51fa\u529b\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u5b9f\u969b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:ruby decode:true \">require 'logger'\r\n\r\n# logger\u3092\u751f\u6210\u3057\u3001\u6700\u5927\u30ed\u30b0\u51fa\u529b\u30ec\u30d9\u30eb\u3092Logger::DEBUG\u306b\u9650\u5b9a\r\nlogger = Logger.new('.\/filescan2.log')\r\n#logger.level = Logger::DEBUG\r\n\r\n# \u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb&quot;sample.txt&quot;\r\nfilename = &quot;sample.txt&quot;\r\n\r\nbegin\r\n\r\n  # \u30c7\u30fc\u30bf\u30d5\u30a1\u30a4\u30eb&quot;sample.txt&quot;\u3092\u884c\u3054\u3068\u306b\u8aad\u307f\u8fbc\u3080\uff08\u30b9\u30ad\u30e3\u30f3\u3059\u308b\uff09\r\n  File.foreach(filename) do |line|\r\n  \r\n    # \u884c\u982d\u304c#\u3067\u59cb\u307e\u3063\u3066\u3044\u306a\u3051\u308c\u3070\u3001\u4f8b\u5916\r\n    unless line.start_with?(&quot;#&quot;)\r\n    \r\n      # \u4f8b\u5916\u3092\u6295\u3052\u308b\r\n      throw\r\n      \r\n    else\r\n      \r\n      # \u30a8\u30e9\u30fc\u3067\u306a\u3051\u308c\u3070\u3001\u6a19\u6e96\u51fa\u529b\u306b\u51fa\u529b\u3059\u308b\r\n      puts line\r\n    end\r\n  end\r\nrescue =&gt; err\r\n  \r\n  # \u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306b\u6539\u884c\u3092\u3064\u3051\u3066\u30ed\u30b0\u51fa\u529b\u3059\u308b\r\n  logger.fatal(err.backtrace.join(&quot;\\n&quot;))\r\n  \r\nend<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff08.\/filescan2.log\uff09\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \"># Logfile created on 2017-09-21 11:34:03 +0900 by logger.rb\/56815\r\nF, [2017-09-21T11:34:03.013734 #20508] FATAL -- : \r\nlogger_stacktrace.rb:19:in `throw'\r\nlogger_stacktrace.rb:19:in `block in &lt;main&gt;'\r\nlogger_stacktrace.rb:13:in `foreach'\r\nlogger_stacktrace.rb:13:in `&lt;main&gt;'<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306a\u5b9f\u884c\u7d50\u679c\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u30d5\u30a1\u30a4\u30eb\u300csample.txt\u300d\u30921\u884c\u3054\u3068\u8aad\u307f\u8fbc\u307f\u3001\u5404\u884c\u304c&quot;#&quot;\u3067\u59cb\u307e\u3063\u3066\u3044\u306a\u3051\u308c\u3070\u30a8\u30e9\u30fc\u3068\u3057\u3066<span style=\"color: #0000ff\"><strong>\u4f8b\u5916\u3092\u6295\u3052<\/strong><\/span>\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u5916\u304c\u6295\u3052\u3089\u308c\u308b\u3068\u3001<span style=\"color: #339966\"><strong>rescue\u30d6\u30ed\u30c3\u30af<\/strong><\/span>\u306b\u51e6\u7406\u304c\u79fb\u308a\u307e\u3059\u3002<\/p>\n<p>rescue\u30d6\u30ed\u30c3\u30af\u306b\u3066\u3001\u4f8b\u5916\u306b\u3075\u304f\u307e\u308c\u308b<span style=\"color: #339966\"><strong>\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9<\/strong><\/span>\u306e\u60c5\u5831\u3092\u30ed\u30b0\u306b\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u884c\u7d50\u679c\u3092\u307f\u308b\u3068\u3001\u30b9\u30bf\u30c3\u30af\u30c8\u30ec\u30fc\u30b9\u306e\u60c5\u5831\u3092\u3001<span style=\"color: #0000ff\"><strong>\u30b9\u30bf\u30c3\u30af\u3042\u305f\u308a1\u884c\u305a\u3064\u51fa\u529b<\/strong><\/span>\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3067\u3001\u30a8\u30e9\u30fc\u306e\u767a\u751f\u7b87\u6240\u304c\u308f\u304b\u308a\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u30a8\u30e9\u30fc\u306e\u767a\u751f\u3057\u305f\u30d5\u30a1\u30a4\u30eb\u540d\u3084\u884c\u756a\u53f7\u304c\u308f\u304b\u308a\u307e\u3059\u306e\u3067\u3001\u30c7\u30d0\u30c3\u30b0\u304c\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001Ruby\u306erescue\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/19513\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/03\/image-25-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">Ruby\u306e\u4f8b\u5916\u51e6\u7406rescue\u307e\u3068\u3081\uff5cbegin\/raise\/ensure\/retry<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h3>\u30ed\u30b0\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u6307\u5b9a<\/h3>\n<p><span style=\"color: #339966\"><strong>\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba<\/strong><\/span>\u304c\u5927\u304d\u304f\u306a\u308b\u3068\u6271\u3044\u306b\u304f\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001Logger\u30af\u30e9\u30b9\u306b\u306f\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u306e\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001<span style=\"color: #0000ff\"><strong>\u6307\u5b9a\u30b5\u30a4\u30ba\u3044\u3063\u3071\u3044<\/strong><\/span>\u306b\u306a\u3063\u305f\u5834\u5408\u3001\u53e4\u304f\u306a\u3063\u305f\u30ed\u30b0\u306e<span style=\"color: #0000ff\"><strong>\u30d5\u30a1\u30a4\u30eb\u540d\u3092\u5909\u66f4\u3057<\/strong><\/span>\u3066\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3068\u3057\u3066\u6b8b\u3059\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u3082\u591a\u304f\u306a\u308a\u3059\u304e\u308b\u3068\u30c7\u30a3\u30b9\u30af\u5bb9\u91cf\u3092\u5727\u8feb\u3057\u307e\u3059\u306e\u3067\u3001<span style=\"color: #0000ff\"><strong>\u4f55\u4e16\u4ee3\u307e\u3067\u6b8b\u3059\u304b<\/strong><\/span>\u6307\u5b9a\u3067\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6307\u5b9a\u3057\u305f\u4e16\u4ee3\u3092\u8d85\u3048\u305f\u4e16\u4ee3\u306e\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u306f<span style=\"color: #0000ff\"><strong>\u81ea\u52d5\u7684\u306b\u524a\u9664<\/strong><\/span>\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u969b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u307f\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:ruby decode:true \">require 'logger'\r\n\r\n# 5\u4e16\u4ee3\u307e\u3067\u30ed\u30b0\u3092\u6b8b\u3059\r\nnth = 5\r\n\r\n# 1\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u3042\u305f\u308a10MB\u307e\u3067\u306e\u5bb9\u91cf\u306b\u3059\u308b\r\nfilesize = 1024 * 10\r\n\r\n# 5\u4e16\u4ee31\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u3042\u305f\u308a10MB\u307e\u3067\u306elogger\u3092\u751f\u6210\r\nlogger = Logger.new('ruby_size_limit.log', nth, filesize)<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001Logger\u306enew\u30e1\u30bd\u30c3\u30c9\u306e\u7b2c2\u5f15\u6570\u306b<span style=\"color: #0000ff\"><strong>\u7ba1\u7406\u3059\u308b\u4e16\u4ee3<\/strong><\/span>\u3001\u7b2c3\u5f15\u6570\u306b<span style=\"color: #0000ff\"><strong>\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u306e\u6700\u5927\u30b5\u30a4\u30ba<\/strong><\/span>\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<h3>\u30ed\u30b0\u306e\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3<\/h3>\n<p>\u524d\u7ae0\u3067\u306f\u3001\u30ed\u30b0\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3068\u4e16\u4ee3\u7ba1\u7406\u306e\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002<\/p>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001\u5225\u306e\u65b9\u6cd5\u3067\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u3092\u7ba1\u7406\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<p>Logger\u306enew\u30e1\u30bd\u30c3\u30c9\u306e\u7b2c2\u5f15\u6570\u306b\u3001\u4ee5\u4e0b\u306e\u6587\u5b57\u5217\u3092\u6e21\u3057\u305f\u5834\u5408\u3001<span style=\"color: #0000ff\"><strong>\u671f\u9593\u3092\u6c7a\u3081\u3066<\/strong><\/span>\u30ed\u30b0\u3092\u30d5\u30a1\u30a4\u30eb\u540d\u5909\u66f4\u3057\u3001<span style=\"color: #0000ff\"><strong>\u904e\u53bb\u306e\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb<\/strong><\/span>\u3068\u3057\u307e\u3059\u3002<\/p>\n\n<table id=\"tablepress-185\" class=\"tablepress tablepress-id-185\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">\u6587\u5b57\u5217<\/th><th class=\"column-2\">\u610f\u5473<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">'daily'<\/td><td class=\"column-2\">1\u65e5\u3054\u3068<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">'weekly'<\/td><td class=\"column-2\">1\u9031\u9593\u3054\u3068<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">'monthly'<\/td><td class=\"column-2\">1\u304b\u6708\u3054\u3068<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-185 from cache -->\n<p>\u3053\u306e\u671f\u9593\u3054\u3068\u306b\u9806\u7e70\u308a\u306b\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u3092\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3059\u308b\u3053\u3068\u3092\u3001<span style=\"color: #339966\"><strong>\u30ed\u30b0\u3092\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3<\/strong><\/span>\u3055\u305b\u308b\u3068\u8a00\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"lang:ruby decode:true \">require 'logger'\r\n\r\n# 1\u65e5\u3054\u3068\u306b\u30ed\u30b0\u3092\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3059\u308blogger\u3092\u751f\u6210\r\nlogger1 = Logger.new('daily.log', 'daily')\r\n\r\n# 1\u9031\u9593\u3054\u3068\u306b\u30ed\u30b0\u3092\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3059\u308blogger\u3092\u751f\u6210\r\nlogger2 = Logger.new('weekly.log', 'weekly')\r\n\r\n# 1\u304b\u6708\u3054\u3068\u306b\u30ed\u30b0\u3092\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3059\u308blogger\u3092\u751f\u6210\r\nlogger3 = Logger.new('monthly.log', 'monthly')<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001Logger\u306enew\u30e1\u30bd\u30c3\u30c9\u306e\u7b2c2\u5f15\u6570\u306b\u3001\u30ed\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3\u3055\u305b\u308b<span style=\"color: #0000ff\"><strong>\u671f\u9593\u306e\u6587\u5b57\u5217<\/strong><\/span>\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<h2>logger\u306e\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9<\/h2>\n<h3>datetime_format\u306b\u3088\u308b\u65e5\u4ed8\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/h3>\n<p>logger\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ed\u30b0\u306e<span style=\"color: #339966\"><strong>\u65e5\u6642\u306e\u51fa\u529b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/strong><\/span>\u306f\u5909\u66f4\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>Logger\u30af\u30e9\u30b9\u306e<span style=\"color: #339966\"><strong>datetime_format\u30d7\u30ed\u30d1\u30c6\u30a3<\/strong><\/span>\u306b\u3001<span style=\"color: #0000ff\"><strong>\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u4ed8\u304d\u6587\u5b57\u5217<\/strong><\/span>\u3092\u8a2d\u5b9a\u3059\u308c\u3070\u3001\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u306a\u304a\u3001<span style=\"color: #339966\"><strong>datetime_format<\/strong><\/span>\u306b\u6307\u5b9a\u3059\u308b\u969b\u3001\u4ee5\u4e0b\u306e<span style=\"color: #339966\"><strong>\u30ad\u30fc\u30ef\u30fc\u30c9<\/strong><\/span>\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n<table id=\"tablepress-183\" class=\"tablepress tablepress-id-183\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">\u30ad\u30fc\u30ef\u30fc\u30c9<\/th><th class=\"column-2\">\u610f\u5473<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">%Y<\/td><td class=\"column-2\">\u5e74<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">%m<\/td><td class=\"column-2\">\u6708<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">%d<\/td><td class=\"column-2\">\u65e5<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">%H<\/td><td class=\"column-2\">\u6642<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">%M<\/td><td class=\"column-2\">\u5206<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">%S<\/td><td class=\"column-2\">\u79d2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-183 from cache -->\n<p>\u306a\u304a\u3001Ruby\u306e\u65e5\u4ed8\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3068\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u306f\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/16204\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2017\/07\/image-20-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010\u5b8c\u5168\u7db2\u7f85\u3011Ruby\u306eTime\u4f7f\u3044\u65b9\u307e\u3068\u3081<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<p>\u5b9f\u969b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u307f\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:ruby decode:true \">require 'logger'\r\n\r\nlogger = Logger.new('date_format.log')\r\n\r\nlogger.datetime_format = '\u3010%Y-%m-%d (%H:%M:%S)\u3011'\r\n\r\nlogger.info('\u30ed\u30b0\u60c5\u5831')<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff08date_format.log\uff09\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \"># Logfile created on 2017-09-21 12:01:56 +0900 by logger.rb\/56815\r\nI, [\u30102017-09-21 (12:01:56)\u3011#6632]  INFO -- : \u30ed\u30b0\u60c5\u5831<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306b\u3001datetime_format\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u6587\u5b57\u5217\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30ed\u30b0\u306e<span style=\"color: #0000ff\"><strong>\u65e5\u6642\u306e\u51fa\u529b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/strong><\/span>\u3092\u5909\u66f4\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n<h3>log\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u6307\u5b9a\u65b9\u6cd5<\/h3>\n<p>\u30ed\u30b0\u60c5\u5831\u306f\u65e5\u4ed8\u4ee5\u5916\u306b\u3082<span style=\"color: #339966\"><strong>\u5168\u4f53\u306e\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/strong><\/span>\u3092\u5909\u66f4\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>Logger\u30af\u30e9\u30b9\u306e<span style=\"color: #339966\"><strong>formatter\u30d7\u30ed\u30d1\u30c6\u30a3<\/strong><\/span>\u306bProc\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6e21\u305b\u3070\u3001\u30ed\u30b0\u51fa\u529b\u6642\u306bProc\u306e\u5f15\u6570\u306b\u4e0b\u8a18\u306e<span style=\"color: #0000ff\"><strong>\u5024<\/strong><\/span>\u304c\u6e21\u3055\u308c\u307e\u3059\u3002<\/p>\n\n<table id=\"tablepress-184\" class=\"tablepress tablepress-id-184\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">\u5909\u6570\u540d<\/th><th class=\"column-2\">\u610f\u5473<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">severity<\/td><td class=\"column-2\">\u30ed\u30b0\u30ec\u30d9\u30eb<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">datetime<\/td><td class=\"column-2\">\u65e5\u6642<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">progname<\/td><td class=\"column-2\">\u30d7\u30ed\u30b0\u30e9\u30e0\u540d<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">msg<\/td><td class=\"column-2\">\u30ed\u30b0\u30e1\u30c3\u30bb\u30fc\u30b8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-184 from cache -->\n<p>\u3053\u308c\u3089\u306e\u5024\u3092\u4f7f\u3063\u3066\u3001\u30ed\u30b0\u60c5\u5831\u3092<span style=\"color: #0000ff\"><strong>\u597d\u304d\u306a\u3088\u3046\u306b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8<\/strong><\/span>\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u5b9f\u969b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:ruby decode:true \">require 'logger'\r\n\r\nlogger = Logger.new('log_format.log')\r\n\r\n# \u30ed\u30b0\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u306e\u5909\u66f4\r\nlogger.formatter = proc do |severity, datetime, progname, msg|\r\n  &quot;\uff01#{severity}\uff01\u3010#{datetime}\u3011(#{progname}): #{msg}\\n&quot;\r\nend\r\n\r\nlogger.info('\u30ed\u30b0\u60c5\u5831')<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff08log_format.log\uff09\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \"># Logfile created on 2017-09-21 12:05:18 +0900 by logger.rb\/56815\r\n\uff01INFO\uff01\u30102017-09-21 12:05:18 +0900\u3011(): \u30ed\u30b0\u60c5\u5831<\/pre>\n<p>\u4ee5\u4e0a\u306e\u3088\u3046\u306a\u5b9f\u884c\u7d50\u679c\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u30ed\u30b0\u3092\u81ea\u7531\u306a\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3067\u51fa\u529b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>logger\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u306e\u4f8b<\/h3>\n<p>logger\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u4f55\u500b\u3067\u3082\u751f\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001logger\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5897\u3048\u308b\u3068\u3001<span style=\"color: #ff0000\"><strong>\u30e1\u30e2\u30ea\u5bb9\u91cf\u304c\u5727\u8feb<\/strong><\/span>\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u4e00\u3064\u306elogger\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3057\u3001\u305d\u308c\u3092\u4f7f\u3044\u307e\u308f\u3059\u3053\u3068\u3067<span style=\"color: #0000ff\"><strong>\u30e1\u30e2\u30ea\u5bb9\u91cf\u3092\u6d88\u8cbb\u3057\u306a\u3044<\/strong><\/span>\u3088\u3046\u306b\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><span style=\"color: #339966\"><strong>\u30c7\u30b6\u30a4\u30f3\u30fb\u30d1\u30bf\u30fc\u30f3<\/strong><\/span>\u3068\u547c\u3070\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u8a2d\u8a08\u6280\u6cd5\u306e\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306e\u4e00\u3064\u3067\u3042\u308b\u3001<span style=\"color: #339966\"><strong>\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\uff08singleton\uff09\u30fb\u30d1\u30bf\u30fc\u30f3<\/strong><\/span>\u3092\u4f7f\u3063\u3066\u307f\u307e\u3059\u3002<\/p>\n<p>\u30b7\u30f3\u30b0\u30eb\u30c8\u30f3\u30fb\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u5168\u4f53\u306e\u4e2d\u3067<span style=\"color: #0000ff\"><strong>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u305f\u3060\u4e00\u3064\u3057\u306a\u304b\u3044<\/strong><\/span>\uff08\u30b7\u30f3\u30b0\u30eb\uff09\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4f7f\u7528\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n<p>\u5b9f\u969b\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u307f\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:ruby decode:true \">require 'logger'\r\n\r\nclass MyLogger\r\n  @@logger = nil\r\n  def self.getLogger\r\n    if @@logger.nil?\r\n      @@logger = Logger.new('.\/log_singleton.log')\r\n    end\r\n    return @@logger\r\n  end\r\nend\r\n\r\nlogger = MyLogger.getLogger\r\nlogger.level = Logger::INFO\r\n\r\nlogger.warn('\u8b66\u544a')<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff08.\/log_singleton.log\uff09\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \"># Logfile created on 2017-09-21 12:21:33 +0900 by logger.rb\/56815\r\nW, [2017-09-21T12:21:33.150118 #18128]  WARN -- : \u8b66\u544a<\/pre>\n<p>\u4e0a\u8a18\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001\u307e\u305a<span style=\"color: #339966\"><strong>@@logger<\/strong><\/span>\u3092nil?\u3067<span style=\"color: #339966\"><strong>\u521d\u671f\u5316<\/strong><\/span>\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u305d\u3057\u3066\u3001getLogger\u304c\u547c\u3070\u308c\u305f\u969b\u3001@@logger\u304cnil\u3067\u3042\u308c\u3070Logger.new\u30e1\u30bd\u30c3\u30c9\u3067<span style=\"color: #0000ff\"><strong>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210<\/strong><\/span>\u3057\u3001nil\u3067\u306a\u3044\u5834\u5408<span style=\"color: #0000ff\"><strong>\u305d\u306e\u307e\u307e@@logger\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8fd4\u3057<\/strong><\/span>\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306f\u3001\u5e38\u306bgetLogger\u306e<span style=\"color: #0000ff\"><strong>\u8fd4\u5024<\/strong><\/span>\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u30d7\u30ed\u30b0\u30e9\u30e0\u5168\u4f53\u3067\u306f\u3001@@logger\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f<span style=\"color: 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