AOP 案例

测量业务层接口万次执行效率

• AOP 概念：AOP

一、 搭建环境

一、配置 Pom 坐标

<dependencies>
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-context</artifactId>
		<version>5.0.13.RELEASE</version>
		<scope>compile</scope>
	</dependency>
	<dependency>
		<groupId>cn.pangcy</groupId>
		<artifactId>spring-book</artifactId>
		<version>1.0-SNAPSHOT</version>
		<scope>compile</scope>
	</dependency>
	<dependency>
		<groupId>org.aspectj</groupId>
		<artifactId>aspectjweaver</artifactId>
		<version>1.8.14</version>
	</dependency>
	<!-- druid -->
	<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>druid</artifactId>
		<version>1.2.16</version>
	</dependency>
	<!-- mysql -->
	<dependency>
		<groupId>mysql</groupId>
		<artifactId>mysql-connector-java</artifactId>
		<version>5.1.46</version>
	</dependency>
	<!-- spring-jdbc -->
	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-jdbc</artifactId>
		<version>5.0.13.RELEASE</version>
	</dependency>
	<!-- mybatis -->
	<dependency>
		<groupId>org.mybatis</groupId>
		<artifactId>mybatis</artifactId>
		<version>3.5.13</version>
	</dependency>
	<!-- spring 整合 mybatis  -->
	<dependency>
		<groupId>org.mybatis</groupId>
		<artifactId>mybatis-spring</artifactId>
		<version>1.3.0</version>
	</dependency>

	<dependency>
		<groupId>junit</groupId>
		<artifactId>junit</artifactId>
		<version>4.13.2</version>
		<scope>test</scope>
	</dependency>

	<dependency>
		<groupId>org.springframework</groupId>
		<artifactId>spring-test</artifactId>
		<version>5.0.13.RELEASE</version>
	</dependency>
</dependencies>

二、Domain 层实现

public class User {
    private String Host;
    private String user;

    public String getHost() {
        return Host;
    }

    public void setHost(String host) {
        Host = host;
    }

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }


    @Override
    public String toString() {
        return "User{" +
                "Host='" + Host + '\'' +
                ", user='" + user + '\'' +
                '}';
    }
}

三、Dao 层实现

public interface UserDao {
	@Select("select * from user")
	List<User> findAll();
}

四、Service 层实现

UserService

public interface UserService {
    void save();
    void update();
    void findAll();
}

UserServiceImpl

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserDao userDao;

    public List<User> findAll(){
        return userDao.findAll();
    }
	
    public void save(){
        System.out.println("User Service Save ...");
    }

    public void update(){
        System.out.println("User Service Update ...");
    }
}

五、SpringConfig

@Configuration
@ComponentScan("cn.pangcy")
@EnableAspectJAutoProxy
public class SpringConfig {
}

二、AOP 实现

/aop/MyAdvice

@Component
@Aspect
public class MyAdvice(){
	@Pointcut("execution(* cn.pangcy.service.*Service.*())")
	private void servicePt();

	@Around("servicePt")
	public void runSpeed(ProceedingJoinPoint pjp) throws Trhowable {
		long start = System.currentTimeMillis();
		for(int i = 0; i < 100; i++){
			pjp.proceed();
		}
		long end = System.curretTimeMillis();
		System.out.println("业务层接口百次执行时间：" +(end - start) +"ms");
	}
}

三、 Test 类

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class UserServiceTest {

    @Autowired
    private UserService userService;

    @Test
    public void testFindUser(){
        System.out.println(userService.findAll());
    }

    @Test
    public void testSave(){
        userService.save();
    }

    @Test
    public void testUpdate(){
        userService.update();
    }
}

四、 AOP 中获取实例信息

• 通过 pjp.getSignature 获取所运行实例的签名信息
• signature.getDeclaringTypeName 获取包/类名路径
• signature.getName 获取运行的方法名

@Component
@Aspect
public class MyAdvice(){
	@Pointcut("execution(* cn.pangcy.service.*Service.*())")
	private void servicePt();

	@Around("servicePt")
    public void runSpeed(ProceedingJoinPoint pjp) throws Throwable {
		// 获取执行签名信息
        Signature signature = pjp.getSignature();
        // 通过签名获取执行类型（接口名）
        String declaringTypeName = signature.getDeclaringTypeName();
        // 通过签名获取执行操作名称（方法名）
        String name = signature.getName();
        long start = System.currentTimeMillis();
        for(int i = 0; i < 100; i++){
            pjp.proceed();
        }
        long end = System.currentTimeMillis();
        System.out.println("业务层接口百次执行时间：" + declaringTypeName +"." + name +" >>> " +(end - start) +"ms");
    }
}