{"id":228,"date":"2016-02-21T18:53:56","date_gmt":"2016-02-21T18:53:56","guid":{"rendered":"http:\/\/kaizen-koka.com\/?p=228"},"modified":"2017-04-02T03:10:51","modified_gmt":"2017-04-02T03:10:51","slug":"spring-aop","status":"publish","type":"post","link":"https:\/\/kaizen-koka.com\/?p=228","title":{"rendered":"Spring-AOP"},"content":{"rendered":"

\"Ai_gWMr6EMaBE5DiYPZUox55qOsok8yDrJ8xm_WHOEmF\"<\/a><\/p>\n

\r\n<dependency>\r\n    <groupId>org.springframework<\/groupId>\r\n    <artifactId>spring-aop<\/artifactId>\r\n<\/dependency>\r\n<dependency>\r\n    <groupId>org.springframework<\/groupId>\r\n    <artifactId>spring-aspects<\/artifactId>\r\n<\/dependency><\/pre>\n
\n\tInstead of maintaining business logic and services logic together, develop services and business logic separately. Inject those services in to Business class using AOP<\/span><\/span>\n<\/p>\n
\n\tMaintaining Service logic separately from Business logic <\/span><\/span>\n<\/p>\n
\n\tServices are like Transaction Services, Security, Mailing, JMS Services<\/span><\/span>\n<\/p>\n
\n\tAspect <\/strong>is nothing but a Service
\n\tAdvice<\/strong> is nothing but a ServiceProvider. By using Advice you can provide ASPECT
\n\tPointCut<\/strong> is nothing but a point or condition to execute aspects for your business methods.
\n\tAdviser<\/strong> is nothing but pointcut with advice combination
\n\tProxy<\/strong> is a waiver (proxy object will be generated by combining service and business code)
\n\ttarget<\/strong> is nothing but businees object<\/span><\/span>\n<\/p>\n
\n\tWe can implement in 3 approaches
\n\tProgramatic approach
\n\tDeclarative approach
\n\tAnnotation approach<\/span><\/span>\n<\/p>\n
\n\tProgramatic approach<\/strong><\/span><\/span>\n<\/p>\n
\n\torg.springframework.aop.MethodBeforeAdvice<\/strong>;
\n\torg.springframework.aop.AfterReturningAdvice<\/strong>;
\n\torg.springframework.aop.ThrowsAdvice<\/strong>;
\n\torg.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor<\/strong>;<\/span>\n<\/p>\n
\n\t
\n\tProgramatic approach:<\/span><\/span>\n<\/p>\n
\r\npublic class LoggingBefore  implements MethodBeforeAdvice{\r\n\r\n    Logger log = LoggerFactory.getLogger(LoggingBefore.class);\r\n\r\n    @Override\r\n    public void before(Method method, Object[] objects, Object o) throws Throwable {\r\n        log.debug("before calling enrollStudent method");\r\n        log.debug(method.getName());\r\n        log.debug(objects.toString());\r\n    }\r\n}<\/pre>\n
\n\tClient Class:<\/span><\/span><\/strong>\n<\/p>\n
\r\n\/\/create target\r\nBankServiceImpl bsi = new BankServiceImpl();\r\n\/\/create advice\r\nLogBeforeService lbs = new LogBeforeService()\r\n\r\n\/\/generating proxy by combining target + advice\r\nProxyFactoryBean pfb = new ProxyFactoryBean();\r\npfb.setTarget(bsi);\r\npfb.addAdvice(loggingBefore);\r\n\r\n\/\/get generated proxy object\r\nBankServiceImpl bsi =(BankServiceImpl)pfb.getObject();\r\n<\/pre>\n
\n\t
\n\tDeclarative approach<\/strong>
\n\t    <\/span><\/span>\n<\/p>\n
\r\n<!--Target -->\r\n   <bean id="stdImpl" class="com.springapp.mvc.service.EnrollStudentServiceImpl"\/>\r\n\r\n    <!-- advice -->\r\n    <bean id="logBef" class="com.springapp.mvc.aop.LoggingBefore"\/>\r\n   \r\n    <!-- proxyBean-->\r\n    <bean id="proxyStudentImpl" class="org.springframework.aop.framework.ProxyFactoryBean">\r\n        <property name="target" ref="stdImpl"\/>\r\n        <property name="interceptorNames">\r\n            <list>\r\n                <value>logBef<\/value>\r\n            <\/list>\r\n        <\/property>\r\n    <\/bean>\r\n<\/pre>\n
\n\tPointcuts :<\/strong> If you want to specify where exactly service need to be executed then we can use pointcut
\n\tStaticMethodMatcherPointcut
\n\tNameMatchMatcherPointcut<\/span><\/span>\n<\/p>\n
\r\npublic class EnrollPointCut extends StaticMethodMatcherPointcut {\r\n    @Override\r\n    public boolean matches(Method method, Class<?> aClass) {\r\n        if(method.getName().equals("enrollStudent")){\r\n            return true;\r\n        }\r\n        return false;\r\n    }\r\n}<\/pre>\n
\n\tAdvicer:<\/strong>
\n\tDefaultPointcutAdvicer
\n\tRegexpMethodPointcutAdvicer   <\/span><\/span>\n<\/p>\n
\r\n <!--Target -->\r\n   <bean id="stdImpl" class="com.springapp.mvc.service.EnrollStudentServiceImpl"\/>\r\n\r\n    <!-- advice -->\r\n    <bean id="logBef" class="com.springapp.mvc.aop.LoggingBefore"\/>\r\n\r\n    <!-- pointCut -->\r\n    <bean id="enrollPointCut" class ="com.springapp.mvc.aop.EnrollPointCut"\/>\r\n    <!-- Advisor -->\r\n    <bean id="dpa" class="org.springframework.aop.support.DefaultPointcutAdvisor">\r\n        <property name="advice" ref="logBef"\/>\r\n        <property name="pointcut" ref="enrollPointCut"\/>\r\n    <\/bean>\r\n\r\n    <!-- proxyBean-->\r\n    <bean id="proxyStudentImpl" class="org.springframework.aop.framework.ProxyFactoryBean">\r\n        <property name="target" ref="stdImpl"\/>\r\n        <property name="interceptorNames">\r\n            <list>\r\n                <value>dpa<\/value>\r\n            <\/list>\r\n        <\/property>\r\n    <\/bean>\r\n\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
<dependency>     <groupId>org.springframework<\/groupId>     <artifactId>spring-aop<\/artifactId> <\/dependency> <dependency>     <groupId>org.springframework<\/groupId>     <artifactId>spring-aspects<\/artifactId> <\/dependency> Instead of maintaining business logic and services logic together, develop services and business logic separately. Inject those services […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[16],"tags":[],"class_list":["post-228","post","type-post","status-publish","format-standard","hentry","category-spring-technologies"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p70lnf-3G","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/kaizen-koka.com\/index.php?rest_route=\/wp\/v2\/posts\/228","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kaizen-koka.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kaizen-koka.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kaizen-koka.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kaizen-koka.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=228"}],"version-history":[{"count":5,"href":"https:\/\/kaizen-koka.com\/index.php?rest_route=\/wp\/v2\/posts\/228\/revisions"}],"predecessor-version":[{"id":237,"href":"https:\/\/kaizen-koka.com\/index.php?rest_route=\/wp\/v2\/posts\/228\/revisions\/237"}],"wp:attachment":[{"href":"https:\/\/kaizen-koka.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=228"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kaizen-koka.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=228"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kaizen-koka.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}