{"id":8815,"date":"2013-02-19T22:00:45","date_gmt":"2013-02-19T20:00:45","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=8815"},"modified":"2013-02-19T06:36:23","modified_gmt":"2013-02-19T04:36:23","slug":"jsf-eager-cdi-beans","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2013\/02\/jsf-eager-cdi-beans.html","title":{"rendered":"JSF &#8211; Eager CDI beans"},"content":{"rendered":"<p>Everybody knows eager managed beans in JSF 2. @ManagedBean has an eager attribute. If eager=&#8217;true&#8217; and the scope is application, then this bean must be created when the application starts and not during the first reference to the bean. This is a nice feature when you want to load application scoped data (e.g. some select items for menus) during application startup in order to increase the performance at runtime.<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<\/p>\n<pre class=\" brush:java\">@ManagedBean(eager=true)\r\n@ApplicationScoped\r\npublic class GlobalBean {\r\n    ...\r\n}<\/pre>\n<p>@ManagedBean annotation will be deprecated with JSF 2.2. It is highly recommended to use CDI (context dependency injection) beans in JEE environment. But what is the equivalent to the eager managed beans in CDI? Well, CDI is flexible, you can write <a href=\"http:\/\/docs.jboss.org\/weld\/reference\/latest\/en-US\/html\/extend.html\">portable CDI extensions<\/a>. I asked <a href=\"http:\/\/tandraschko.blogspot.de\/\">Thomas Andraschko<\/a> how to do this. Thomas is a CDI expert, co-owner of PrimeFaces Extensions and the committer in OpenWebBeans (OWB) project. His tip was to implement such extension as follows:<div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<pre class=\" brush:java\">@Qualifier\r\n@Retention(RetentionPolicy.RUNTIME)\r\n@Target({TYPE})\r\npublic @interface Eager\r\n{\r\n}<\/pre>\n<pre class=\" brush:java\">package mydomain.mypackage;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\nimport javax.enterprise.context.ApplicationScoped;\r\nimport javax.enterprise.event.Observes;\r\nimport javax.enterprise.inject.spi.AfterDeploymentValidation;\r\nimport javax.enterprise.inject.spi.Bean;\r\nimport javax.enterprise.inject.spi.BeanManager;\r\nimport javax.enterprise.inject.spi.Extension;\r\nimport javax.enterprise.inject.spi.ProcessBean;\r\n\r\npublic class EagerExtension implements Extension {\r\n    private List&lt;Bean&lt;?&gt;&gt; eagerBeansList = new ArrayList&lt;Bean&lt;?&gt;&gt;();\r\n\r\n    public &lt;T&gt; void collect(@Observes ProcessBean&lt;T&gt; event) {\r\n        if (event.getAnnotated().isAnnotationPresent(Eager.class)\r\n            &amp;&amp; event.getAnnotated().isAnnotationPresent(ApplicationScoped.class)) {\r\n            eagerBeansList.add(event.getBean());\r\n        }\r\n    }\r\n\r\n    public void load(@Observes AfterDeploymentValidation event, BeanManager beanManager) {\r\n        for (Bean&lt;?&gt; bean : eagerBeansList) {\r\n            \/\/ note: toString() is important to instantiate the bean\r\n            beanManager.getReference(bean, bean.getBeanClass(), beanManager.createCreationalContext(bean)).toString();\r\n        }\r\n    }\r\n}<\/pre>\n<p>The extensions should be registered in a file META-INF\/services\/javax.enterprise.inject.spi.Extension. The file has only one line with a fully qualified path to the EagerExtension class, e.g. mydomain.mypackage.EagerExtension. Using is simple. Assume, we have an application scoped LayoutController CDI bean which is responsible for the entire layout configration. We can annotate it with @Eager and speed up the layout creation.<\/p>\n<pre class=\" brush:java\">@ApplicationScoped\r\n@Eager\r\n@Named\r\npublic class LayoutController implements Serializable {\r\n    private LayoutOptions layoutOptions;\r\n\r\n    @PostConstruct\r\n    protected void initialize() {\r\n        layoutOptions = new LayoutOptions();\r\n\r\n        LayoutOptions panes = new LayoutOptions();\r\n        panes.addOption('slidable', false);\r\n        panes.addOption('spacing', 6);\r\n        layoutOptions.setPanesOptions(panes);\r\n\r\n        ...\r\n    }\r\n\r\n    public LayoutOptions getLayoutOptions() {\r\n        return layoutOptions;\r\n    }\r\n}<\/pre>\n<p>Have fun with CDI!<br \/>\n&nbsp;<\/p>\n<p><b><i>Reference: <\/i><\/b><a href=\"http:\/\/ovaraksin.blogspot.com\/2013\/02\/eager-cdi-beans.html\">JSF &#8211; Eager CDI beans<\/a> from our <a href=\"http:\/\/www.javacodegeeks.com\/p\/jcg.html\">JCG partner<\/a> Oleg Varaksin at the <a href=\"http:\/\/ovaraksin.blogspot.com\/\">Thoughts on software development<\/a> blog.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Everybody knows eager managed beans in JSF 2. @ManagedBean has an eager attribute. If eager=&#8217;true&#8217; and the scope is application, then this bean must be created when the application starts and not during the first reference to the bean. This is a nice feature when you want to load application scoped data (e.g. some select &hellip;<\/p>\n","protected":false},"author":200,"featured_media":174,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[290,293],"class_list":["post-8815","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-cdi","tag-jsf"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>JSF - Eager CDI beans<\/title>\n<meta name=\"description\" content=\"Everybody knows eager managed beans in JSF 2. @ManagedBean has an eager attribute. 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