Create AOP examples

- Use different types of advice
- Use various types of pointcut expressions

spring-mvc-java/src/main/java/org/baeldung/aop/LoggingAspect.java

@@ -0,0 +1,34 @@
+package org.baeldung.aop;
+
+import org.aspectj.lang.JoinPoint;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Before;
+import org.aspectj.lang.annotation.Pointcut;
+import org.springframework.stereotype.Component;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.logging.Logger;
+
+@Component
+@Aspect
+public class LoggingAspect {
+
+    private static Logger logger = Logger.getLogger(LoggingAspect.class.getName());
+
+    private ThreadLocal<SimpleDateFormat> sdf = new ThreadLocal<SimpleDateFormat>() {
+        @Override
+        protected SimpleDateFormat initialValue() {
+            return new SimpleDateFormat("[yyyy-mm-dd hh:mm:ss:SSS]");
+        }
+    };
+
+    @Pointcut("@target(org.springframework.stereotype.Repository)")
+    public void repositoryMethods() {}
+
+    @Before("repositoryMethods()")
+    public void logMethodCall(JoinPoint jp) throws Throwable {
+        String methodName = jp.getSignature().getName();
+        logger.info(sdf.get().format(new Date()) + methodName);
+    }
+}

spring-mvc-java/src/main/java/org/baeldung/aop/PerformanceAspect.java

@@ -16,7 +16,7 @@ public class PerformanceAspect {
     private static Logger logger = Logger.getLogger(PerformanceAspect.class.getName());
 
     @Pointcut("within(@org.springframework.stereotype.Repository *)")
-    public void repositoryClassMethods() {};
+    public void repositoryClassMethods() {}
 
     @Around("repositoryClassMethods()")
     public Object measureMethodExecutionTime(ProceedingJoinPoint pjp) throws Throwable {

spring-mvc-java/src/main/java/org/baeldung/aop/PublishingAspect.java

@@ -0,0 +1,36 @@
+package org.baeldung.aop;
+
+import org.aspectj.lang.JoinPoint;
+import org.aspectj.lang.annotation.AfterReturning;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Pointcut;
+import org.baeldung.events.FooCreationEvent;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationEventPublisher;
+import org.springframework.stereotype.Component;
+
+@Component
+@Aspect
+public class PublishingAspect {
+
+    private ApplicationEventPublisher eventPublisher;
+
+    @Autowired
+    public void setEventPublisher(ApplicationEventPublisher eventPublisher) {
+        this.eventPublisher = eventPublisher;
+    }
+
+    @Pointcut("@target(org.springframework.stereotype.Repository)")
+    public void repositoryMethods() {}
+
+    @Pointcut("execution(* *..create*(Long,..))")
+    public void firstLongParamMethods() {}
+
+    @Pointcut("repositoryMethods() && firstLongParamMethods()")
+    public void entityCreationMethods() {}
+
+    @AfterReturning(value = "entityCreationMethods()", returning = "entity")
+    public void logMethodCall(JoinPoint jp, Object entity) throws Throwable {
+        eventPublisher.publishEvent(new FooCreationEvent(entity));
+    }
+}

spring-mvc-java/src/main/java/org/baeldung/dao/FooDao.java

@@ -1,10 +1,16 @@
 package org.baeldung.dao;
 
+import org.baeldung.model.Foo;
 import org.springframework.stereotype.Repository;
 
 @Repository
 public class FooDao {
+
     public String findById(Long id) {
         return "Bazz";
     }
+
+    public Foo create(Long id, String name) {
+        return new Foo(id, name);
+    }
 }

spring-mvc-java/src/main/java/org/baeldung/events/FooCreationEvent.java

@@ -0,0 +1,10 @@
+package org.baeldung.events;
+
+import org.springframework.context.ApplicationEvent;
+
+public class FooCreationEvent extends ApplicationEvent {
+
+    public FooCreationEvent(Object source) {
+        super(source);
+    }
+}

spring-mvc-java/src/main/java/org/baeldung/events/FooCreationEventListener.java

@@ -0,0 +1,17 @@
+package org.baeldung.events;
+
+import org.springframework.context.ApplicationListener;
+import org.springframework.stereotype.Component;
+
+import java.util.logging.Logger;
+
+@Component
+public class FooCreationEventListener implements ApplicationListener<FooCreationEvent> {
+
+    private static Logger logger = Logger.getLogger(FooCreationEventListener.class.getName());
+
+    @Override
+    public void onApplicationEvent(FooCreationEvent event) {
+        logger.info("Created foo instance: " + event.getSource().toString());
+    }
+}

spring-mvc-java/src/main/java/org/baeldung/model/Foo.java

@@ -0,0 +1,19 @@
+package org.baeldung.model;
+
+public class Foo {
+    private Long id;
+    private String name;
+
+    public Foo(Long id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    @Override
+    public String toString() {
+        return "Foo{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                '}';
+    }
+}