{"id":3236,"date":"2024-11-14T17:06:28","date_gmt":"2024-11-14T17:06:28","guid":{"rendered":"https:\/\/sankhamtech.com\/index.php\/content\/india\/english\/home\/free-courses\/aem-backend-concepts\/improving-aem-sling-model-with-service-layer-integration\/"},"modified":"2024-11-15T18:22:31","modified_gmt":"2024-11-15T18:22:31","slug":"improving-aem-sling-model-with-service-layer-integration","status":"publish","type":"page","link":"https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/improving-aem-sling-model-with-service-layer-integration\/","title":{"rendered":"Improving AEM Sling Model with Service Layer Integration"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"3236\" class=\"elementor elementor-3236\">\n\t\t\t\t<div class=\"elementor-element elementor-element-48981dc e-flex e-con-boxed e-con e-parent\" data-id=\"48981dc\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div 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href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/create-various-dialog-box-fields\/'>Create Various Dialog Box Fields<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/video-lesson-sling-models-and-sightly-introduction\/'>[VIDEO LESSON] Sling Models and Sightly Introduction<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/video-lesson-sling-model-explained-with-real-use-case\/'>[VIDEO LESSON] Sling Model Explained with Real Use Case<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a 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href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/video-lesson-introduction-to-aem-sling-servlet\/'>[VIDEO LESSON] Introduction to AEM Sling Servlet<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/video-lesson-aem-headless-servlet-implementation\/'>[VIDEO LESSON] AEM Headless \u2013 Servlet Implementation<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/video-lesson-osgi-services-introduction\/'>[VIDEO LESSON] OSGI Services Introduction<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/video-lesson-aem-osgi-services-implementation\/'>[VIDEO LESSON] AEM OSGI Services Implementation<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/video-lesson-filters-in-osgi-services\/'>[VIDEO LESSON] Filters in OSGI Services<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/calling-external-api-from-osgi-service\/'>Calling External API from OSGI Service<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/improving-aem-sling-model-with-service-layer-integration\/' style='color: #FF7700 !important'>Improving AEM Sling Model with Service Layer Integration<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/best-practices-for-secure-and-efficient-resource-access\/'>Best Practices for Secure and Efficient Resource Access<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/video-lessonstep-by-step-process-to-get-resource-resolver-from-system-user\/'>[VIDEO LESSON]Step By Step Process to Get Resource Resolver from System User<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/the-importance-and-use-cases-of-workflows\/'>The Importance and Use Cases of Workflows<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/introduction-to-workflow-creation\/'>Introduction to Workflow Creation<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/understanding-participant-step-in-aem\/'>Understanding Participant Step in AEM<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/understanding-workflow-steps\/'>Understanding Workflow Steps<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/understanding-workflow-steps-contd\/'>Understanding Workflow Steps [Contd.]<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/step-1-understand-aem-workflow-use-case\/'>Step 1: Understand AEM Workflow Use Case.<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/step-2-create-user-groups-and-assign-users\/'>Step 2: Create User Groups and Assign Users<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/step-3-create-new-page-properties\/'>Step 3: Create New Page Properties<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><li class='darsanam-menu-item'><a href='https:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/workflow-example-code-below\/'>Workflow Example Code Below<\/a><i class=\"menu-icon-right fas fa-angle-right\"><\/i><\/li><\/ul><\/nav><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5020b1f e-con-full e-flex e-con e-child\" data-id=\"5020b1f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9e35be7 elementor-widget elementor-widget-text-editor\" data-id=\"9e35be7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Improving AEM Sling Model with Service Layer Integration<\/h2><p><\/p><p>When developing Adobe Experience Manager (AEM) applications, adhering to best practices and coding standards ensures maintainability, scalability, and efficiency. A common area for optimization involves the separation of concerns\u2014specifically, the distinction between data representation (models) and business logic (services). This article will explore the benefits of moving business logic from a Sling Model&#8217;s <code>init<\/code> method to a dedicated service, demonstrate how to make this change, highlight issues related to coding standards in the provided model, and finally, present a revised version of the code adhering to AEM&#8217;s recommended practices.<\/p><p> <\/p><h4 class=\"wp-block-heading\">Moving Business Logic to a Service<\/h4><p> <\/p><p>The initial code sample reveals a Sling Model performing tasks beyond data representation, including querying the JCR for data. This approach can lead to bloated models, hindered testability, and reduced reusability. Instead, these responsibilities should be offloaded to a service.<\/p><p> <\/p><h5 class=\"wp-block-heading\">Revised Model with Service Integration<\/h5><p> <\/p><pre class=\"wp-block-code\"><code>\/\/ ArticleListModel.java\n@Model(adaptables = Resource.class, defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)\npublic class ArticleListModel {\n\n    @ValueMapValue\n    private String articleRootPath;\n\n    @Self\n    private Resource resource;\n\n    @OSGiService\n    private ArticleListService articleListService;\n\n    private List&lt;ArticleListDataBean&gt; articleListDataBeans;\n\n    public String getArticleRootPath() {\n        return articleRootPath;\n    }\n\n    public List&lt;ArticleListDataBean&gt; getArticleListDataBeans() {\n        return articleListDataBeans;\n    }\n\n    @PostConstruct\n    protected void init() {\n        articleListDataBeans = articleListService.getArticleListDataBeans(resource, articleRootPath);\n    }\n}\n<\/code><\/pre><p> <\/p><h5 class=\"wp-block-heading\">The Dedicated Service<\/h5><p> <\/p><pre class=\"wp-block-code\"><code>\/\/ ArticleListService.java\n@Service\npublic class ArticleListServiceImpl implements ArticleListService {\n\n    private static final Logger LOGGER = LoggerFactory.getLogger(ArticleListServiceImpl.class);\n\n    @Reference\n    private QueryBuilder builder;\n\n    @Override\n    public List&lt;ArticleListDataBean&gt; getArticleListDataBeans(Resource resource, String articleRootPath) {\n        List&lt;ArticleListDataBean&gt; articleListDataBeans = new ArrayList&lt;&gt;();\n        ResourceResolver resourceResolver = resource.getResourceResolver();\n        Session session = resourceResolver.adaptTo(Session.class);\n\n        Map&lt;String, String&gt; predicate = new HashMap&lt;&gt;();\n        predicate.put(\"path\", articleRootPath);\n        predicate.put(\"type\", \"cq:Page\");\n\n        try {\n            Query query = builder.createQuery(PredicateGroup.create(predicate), session);\n            SearchResult searchResult = query.getResult();\n\n            for (Hit hit : searchResult.getHits()) {\n                try {\n                    String path = hit.getPath();\n                    Resource articleResource = resourceResolver.getResource(path);\n                    Page articlePage = articleResource.adaptTo(Page.class);\n\n                    if (articlePage != null) {\n                        ArticleListDataBean articleListDataBean = new ArticleListDataBean();\n                        articleListDataBean.setPath(path);\n                        articleListDataBean.setTitle(articlePage.getTitle());\n                        articleListDataBean.setDescription(articlePage.getDescription());\n\n                        articleListDataBeans.add(articleListDataBean);\n                    }\n                } catch (RepositoryException e) {\n                    LOGGER.error(\"Error processing search result hit\", e);\n                }\n            }\n        } catch (Exception e) {\n            LOGGER.error(\"Error executing query\", e);\n        }\n        return articleListDataBeans;\n    }\n}\n<\/code><\/pre><p> <\/p><h4 class=\"wp-block-heading\">Issues and Improvements in the Original Model<\/h4><p> <\/p><ol class=\"wp-block-list\"><li><strong>Separation of Concerns<\/strong>: The original model mixes data fetching and representation, which should be separated for clarity and maintainability.<\/li> <li><strong>Resource Handling<\/strong>: The model directly uses <code>Session<\/code> and <code>ResourceResolver<\/code> without demonstrating proper resource management practices, such as closing sessions or handling potential leaks.<\/li> <li><strong>Testability<\/strong>: Embedding business logic within the model makes unit testing more challenging, as testing the model requires mocking more external dependencies.<\/li> <li><strong>Reusability<\/strong>: The logic within the <code>init<\/code> method is specific to this model and cannot be easily reused by other models or components.<\/li><\/ol><p> <\/p><h4 class=\"wp-block-heading\">Transformed Code as per AEM Standards<\/h4><p> <\/p><p>The revised model demonstrates the application of AEM coding standards by delegating business logic to a service, thereby adhering to the separation of concerns principle and enhancing testability and reusability. Additionally, it ensures efficient resource management by handling resource resolution within the service layer, where resources can be managed more systematically.<\/p><p> <\/p><p>This approach aligns with AEM&#8217;s best practices, facilitating a cleaner, more modular architecture that benefits developers and the overall application lifecycle.<\/p><p><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Lessons Lessons &nbsp; Menu Github Link for the Entire Course [VIDEO LESSON] How the Internet Works [VIDEO LESSON] Web Development Architecture Decoded Introduction to Content Management Systems Content Management vs Experience Management [VIDEO LESSON] What is Adobe Experience Manager? [VIDEO LESSON] How to Obtain Adobe Experience Manager (AEM) JAR from Adobe [VIDEO LESSON] Installing AEM [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2868,"menu_order":46,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3236","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Improving AEM Sling Model with Service Layer Integration - Sankham Technologies<\/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:\/\/sankhamtech.com\/index.php\/content\/in\/en\/home\/free-courses\/aem-backend-concepts\/improving-aem-sling-model-with-service-layer-integration\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Improving AEM Sling Model with Service Layer Integration - Sankham Technologies\" \/>\n<meta property=\"og:description\" content=\"Lessons Lessons &nbsp; Menu Github Link for the Entire Course [VIDEO LESSON] How the Internet Works [VIDEO LESSON] Web Development Architecture Decoded Introduction to Content Management Systems Content Management vs Experience Management [VIDEO LESSON] What is Adobe Experience Manager? 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