{"id":724,"date":"2019-11-30T13:28:50","date_gmt":"2019-11-30T13:28:50","guid":{"rendered":"https:\/\/golangbyexamples.com\/?p=724"},"modified":"2019-12-27T16:39:06","modified_gmt":"2019-12-27T16:39:06","slug":"template-method-design-pattern-golang","status":"publish","type":"post","link":"https:\/\/golangbyexamples.com\/template-method-design-pattern-golang\/","title":{"rendered":"Template Method Design Pattern in Go (Golang)"},"content":{"rendered":"\n<p class=\"has-medium-font-size\">Note: Interested in understanding how all other design patterns can be implemented in GO. Please see this full reference  &#8211; <a href=\"https:\/\/golangbyexamples.com\/all-design-patterns-golang\/\">All Design Patterns in Go (Golang)<\/a><\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/golangbyexamples.com\/template-method-design-pattern-golang\/#Introduction\" title=\"Introduction:\">Introduction:<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/golangbyexamples.com\/template-method-design-pattern-golang\/#Example\" title=\"Example\">Example<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-1\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/golangbyexamples.com\/template-method-design-pattern-golang\/#Full_Working_Code\" title=\"Full Working Code:\">Full Working Code:<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Introduction\"><\/span><strong>Introduction:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\">Template Method Design Pattern is a behavioral design pattern that lets you define a template or algorithm for a particular operation.&nbsp;&nbsp;Let&#8217;s understand the template design pattern with an example.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">Consider the example of One Time Password or OTP. There are different types of OTP that can be triggered for eg. OTP can be <strong>SMS<\/strong> OTP or <strong>EMAIL<\/strong> OTP.&nbsp; But irrespective it is an <strong>SMS<\/strong> OTP or <strong>EMAIL<\/strong> OTP,&nbsp; the entire steps of the OTP process are the same.&nbsp; The steps are<\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Generate a random n digit number.&nbsp;<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Save this number in the cache for later verification.&nbsp;<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Prepare the content<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Send the notification<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li>Publish the metrics<\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">Even in the future let&#8217;s say a push notification <strong>OTP<\/strong> is introduced but still it will go through the above steps.<\/p>\n\n\n\n<p class=\"has-medium-font-size\">In such scenarios when the steps of a particular operation are the same but the steps of the operations can be implemented in a different way by different implementors , then that becomes a candidate for the Template Method Design Pattern. We define a template or algorithm which comprises of a fixed number of methods. The implementer of the operation overrides the methods of the template. <\/p>\n\n\n\n<p class=\"has-medium-font-size\">Now check out the below code example. <\/p>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>iOtp<\/strong> represents an interface that defines the set of methods that any otp type should implement<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>sms<\/strong> and <strong>email<\/strong> are the implementors of <strong>iOtp<\/strong> interface<\/li><\/ul>\n\n\n\n<ul class=\"has-medium-font-size wp-block-list\"><li><strong>otp<\/strong> is the struct which defines the template method <strong>genAndSendOTP(). otp<\/strong> embeds <strong>iOtp<\/strong> interface.&nbsp; <\/li><\/ul>\n\n\n\n<p class=\"has-medium-font-size\">Important: The combination of iOtp interface and otp struct provides the capabilities of Abstract Class in go. For reference see <\/p>\n\n\n\n<figure class=\"wp-block-embed-wordpress wp-block-embed is-type-wp-embed is-provider-welcome-to-golang-by-example\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"fqHnV3R5rZ\"><a href=\"https:\/\/golangbyexamples.com\/go-abstract-class\/\">Abstract Class in GO: Complete Guide<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;Abstract Class in GO: Complete Guide&#8221; &#8212; Welcome To Golang By Example\" src=\"https:\/\/golangbyexamples.com\/go-abstract-class\/embed\/#?secret=IJrupn5jVu#?secret=fqHnV3R5rZ\" data-secret=\"fqHnV3R5rZ\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Example\"><\/span><strong>Example<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"has-medium-font-size\"><strong>otp.go<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\ntype iOtp interface {\n    genRandomOTP(int) string\n    saveOTPCache(string)\n    getMessage(string) string\n    sendNotification(string) error\n    publishMetric()\n}\n\ntype otp struct {\n    iOtp iOtp\n}\n\nfunc (o *otp) genAndSendOTP(otpLength int) error {\n    otp := o.iOtp.genRandomOTP(otpLength)\n    o.iOtp.saveOTPCache(otp)\n    message := o.iOtp.getMessage(otp)\n    err := o.iOtp.sendNotification(message)\n    if err != nil {\n        return err\n    }\n    o.iOtp.publishMetric()\n    return nil\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>sms.go<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\ntype sms struct {\n    otp\n}\n\nfunc (s *sms) genRandomOTP(len int) string {\n    randomOTP := \"1234\"\n    fmt.Printf(\"SMS: generating random otp %s\\n\", randomOTP)\n    return randomOTP\n}\n\nfunc (s *sms) saveOTPCache(otp string) {\n    fmt.Printf(\"SMS: saving otp: %s to cache\\n\", otp)\n}\n\nfunc (s *sms) getMessage(otp string) string {\n    return \"SMS OTP for login is \" + otp\n}\n\nfunc (s *sms) sendNotification(message string) error {\n    fmt.Printf(\"SMS: sending sms: %s\\n\", message)\n    return nil\n}\n\nfunc (s *sms) publishMetric() {\n    fmt.Printf(\"SMS: publishing metrics\\n\")\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>email.go<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\ntype email struct {\n    otp\n}\n\nfunc (s *email) genRandomOTP(len int) string {\n    randomOTP := \"1234\"\n    fmt.Printf(\"EMAIL: generating random otp %s\\n\", randomOTP)\n    return randomOTP\n}\n\nfunc (s *email) saveOTPCache(otp string) {\n    fmt.Printf(\"EMAIL: saving otp: %s to cache\\n\", otp)\n}\n\nfunc (s *email) getMessage(otp string) string {\n    return \"EMAIL OTP for login is \" + otp\n}\n\nfunc (s *email) sendNotification(message string) error {\n    fmt.Printf(\"EMAIL: sending email: %s\\n\", message)\n    return nil\n}\n\nfunc (s *email) publishMetric() {\n    fmt.Printf(\"EMAIL: publishing metrics\\n\")\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>main.go<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\nfunc main() {\n    smsOTP := &sms{}\n    o := otp{\n        iOtp: smsOTP,\n    }\n    o.genAndSendOTP(4)\n    fmt.Println(\"\")\n    emailOTP := &email{}\n    o = otp{\n        iOtp: emailOTP,\n    }\n    o.genAndSendOTP(4)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">SMS: generating random otp 1234\nSMS: saving otp: 1234 to cache\nSMS: sending sms: SMS OTP for login is 1234\nSMS: publishing metrics\n\nEMAIL: generating random otp 1234\nEMAIL: saving otp: 1234 to cache\nEMAIL: sending email: EMAIL OTP for login is 1234\nEMAIL: publishing metrics<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Full_Working_Code\"><\/span><strong>Full Working Code:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-go\">package main\n\nimport \"fmt\"\n\ntype iOtp interface {\n    genRandomOTP(int) string\n    saveOTPCache(string)\n    getMessage(string) string\n    sendNotification(string) error\n    publishMetric()\n}\n\ntype otp struct {\n    iOtp iOtp\n}\n\nfunc (o *otp) genAndSendOTP(otpLength int) error {\n    otp := o.iOtp.genRandomOTP(otpLength)\n    o.iOtp.saveOTPCache(otp)\n    message := o.iOtp.getMessage(otp)\n    err := o.iOtp.sendNotification(message)\n    if err != nil {\n        return err\n    }\n    o.iOtp.publishMetric()\n    return nil\n}\n\ntype sms struct {\n    otp\n}\n\nfunc (s *sms) genRandomOTP(len int) string {\n    randomOTP := \"1234\"\n    fmt.Printf(\"SMS: generating random otp %s\\n\", randomOTP)\n    return randomOTP\n}\n\nfunc (s *sms) saveOTPCache(otp string) {\n    fmt.Printf(\"SMS: saving otp: %s to cache\\n\", otp)\n}\n\nfunc (s *sms) getMessage(otp string) string {\n    return \"SMS OTP for login is \" + otp\n}\n\nfunc (s *sms) sendNotification(message string) error {\n    fmt.Printf(\"SMS: sending sms: %s\\n\", message)\n    return nil\n}\n\nfunc (s *sms) publishMetric() {\n    fmt.Printf(\"SMS: publishing metrics\\n\")\n}\n\ntype email struct {\n    otp\n}\n\nfunc (s *email) genRandomOTP(len int) string {\n    randomOTP := \"1234\"\n    fmt.Printf(\"EMAIL: generating random otp %s\\n\", randomOTP)\n    return randomOTP\n}\n\nfunc (s *email) saveOTPCache(otp string) {\n    fmt.Printf(\"EMAIL: saving otp: %s to cache\\n\", otp)\n}\n\nfunc (s *email) getMessage(otp string) string {\n    return \"EMAIL OTP for login is \" + otp\n}\n\nfunc (s *email) sendNotification(message string) error {\n    fmt.Printf(\"EMAIL: sending email: %s\\n\", message)\n    return nil\n}\n\nfunc (s *email) publishMetric() {\n    fmt.Printf(\"EMAIL: publishing metrics\\n\")\n}\n\nfunc main() {\n    smsOTP := &sms{}\n    o := otp{\n        iOtp: smsOTP,\n    }\n    o.genAndSendOTP(4)\n    fmt.Println(\"\")\n    emailOTP := &email{}\n    o = otp{\n        iOtp: emailOTP,\n    }\n    o.genAndSendOTP(4)\n}<\/code><\/pre>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Output:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-prismatic-blocks\"><code class=\"language-\">SMS: generating random otp 1234\nSMS: saving otp: 1234 to cache\nSMS: sending sms: SMS OTP for login is 1234\nSMS: publishing metrics\n\nEMAIL: generating random otp 1234\nEMAIL: saving otp: 1234 to cache\nEMAIL: sending email: EMAIL OTP for login is 1234\nEMAIL: publishing metrics<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Note: Interested in understanding how all other design patterns can be implemented in GO. Please see this full reference &#8211; All Design Patterns in Go (Golang) Table of Contents Introduction:ExampleFull Working Code:&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","footnotes":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false},"categories":[1],"tags":[26,3,4,93,27,92],"class_list":["post-724","post","type-post","status-publish","format-standard","hentry","category-tech","tag-design","tag-go","tag-golang","tag-method","tag-pattern","tag-template"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Template Method Design Pattern in Go (Golang) - Welcome To Golang By Example<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/golangbyexamples.com\/template-method-design-pattern-golang\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Template Method Design Pattern in Go (Golang) - Welcome To Golang By Example\" \/>\n<meta property=\"og:description\" content=\"Note: Interested in understanding how all other design patterns can be implemented in GO. 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