Add example implementation for AOP performance test annotation using …

…Spring Boot

pom.xml

@@ -51,6 +51,7 @@
     <module>week-7/ceasar-coding</module>
     <module>week-8/dependency-injection-framework</module>    <module>week-8/exception-handling</module>
     <module>week-8/json-serialization</module>
+    <module>week-9/aop-performance-test</module>
   </modules>
 
   <dependencyManagement>
@@ -85,6 +86,11 @@
         <artifactId>jackson-databind</artifactId>
         <version>2.11.2</version>
       </dependency>
+      <dependency>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-aop</artifactId>
+        <version>2.3.3.RELEASE</version>
+      </dependency>
 
       <dependency>
         <groupId>org.hamcrest</groupId>

week-9/aop-performance-test/pom.xml

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>unideb-prog2-parent</artifactId>
+        <groupId>com.epam.training</groupId>
+        <version>1.0-SNAPSHOT</version>
+        <relativePath>../..</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>aop-performance-test</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-aop</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest</artifactId>
+        </dependency>
+    </dependencies>
+</project>

week-9/aop-performance-test/src/main/java/com/epam/training/CustomTimer.java

@@ -0,0 +1,16 @@
+package com.epam.training;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Custom performance test marker annotation.
+ * Execution time for every method marked with this annotation will be collected and printed to stdout.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface CustomTimer {
+}
+

week-9/aop-performance-test/src/main/java/com/epam/training/CustomTimerAspect.java

@@ -0,0 +1,32 @@
+package com.epam.training;
+
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StopWatch;
+
+/**
+ * Custom aspect for collecting execution time for methods annotated with {@link CustomTimer}.
+ */
+@Aspect
+@Service
+public class CustomTimerAspect {
+
+    @Around("@annotation(com.epam.training.CustomTimer)")
+    public Object timeAnnotatedMethod(ProceedingJoinPoint pjp) throws Throwable {
+        // start stopwatch
+        StopWatch stopWatch = new StopWatch(pjp.getTarget().toString());
+        stopWatch.start();
+
+        Object retVal = pjp.proceed();
+
+        // stop stopwatch
+        stopWatch.stop();
+
+        System.out.println("Execution time for " + pjp.getTarget().toString() + ": " + stopWatch.getTotalTimeMillis() + " ms");
+
+        return retVal;
+    }
+
+}

week-9/aop-performance-test/src/main/java/com/epam/training/ExampleService.java

@@ -0,0 +1,18 @@
+package com.epam.training;
+
+import org.springframework.stereotype.Service;
+
+@Service
+public class ExampleService {
+
+    @CustomTimer
+    public void exampleMethodToTime() throws InterruptedException {
+        System.out.println("Testee start!");
+
+        Thread.sleep(1000);
+
+        System.out.println("Testee end!");
+    }
+
+}
+

week-9/aop-performance-test/src/main/java/com/epam/training/MainApplication.java

@@ -0,0 +1,24 @@
+package com.epam.training;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.EnableAspectJAutoProxy;
+
+@SpringBootApplication
+@EnableAspectJAutoProxy
+public class MainApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(MainApplication.class, args);
+    }
+
+    @Bean
+    public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
+        return args -> ctx.getBean(ExampleService.class).exampleMethodToTime();
+    }
+
+}
+