The best practice of Apache Servicemix :: Bundles :: Spring Aop in the Java class library

Apache ServiceMix is an open source corporate service bus (ESB) and integrated platform for integrating different applications and systems.Among them, Apache Servicemix :: Bundles :: Spring Aop is an important component of Apache Servicemix, which is used to realize the function of cutting -oriented programming (AOP) in Servicesmix. In Apache ServiceMix :: Bundles :: Spring Aop, we can use AOP technology to solve the horizontal sectaries in the application.The horizontal section focus refers to the functions or tasks repeatedly appearing in multiple modules or components in the application, such as log records and security checks.By using AOP, we can separate these horizontal sectaries from the core business logic in order to facilitate maintenance and reuse. The following is the best practice of Apache Servicemix :: Bundles :: Spring Aop, including configuration and programming examples: 1. Add dependencies: First of all, we need to add the dependency item of Apache Servicemix :: Bundles :: Spring Aop to our project.It can be implemented by building tools such as Maven.The following is an example dependencies in the Maven configuration file: <dependency> <groupId>org.apache.servicemix.bundles</groupId> <artifactId>org.apache.servicemix.bundles.spring-aop</artifactId> <version>X.X.X</version> </dependency> In the above configuration, `x.x.x` represents the required Apache Servicemix :: Bundles :: Spring Aop version number. 2. Create cutting classes: Next, we need to create a cut -off class to define our horizontal sectaries.The cut -off class is a Java class, which contains some methods (called cutting points), which will be executed on a specific execution point.Here are a simple example of cutting surface: import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; @Aspect public class LoggingAspect { @Before("execution(* com.example.service.*.*(..))") public void beforeAdvice(){ System.out.println ("Execution log records before calling business methods"); } } In the above example, we define a cut type called `Loggingaspect`.It contains a method called `BeforeAdvice`, which printed a log record before any method in any method in any method in any method in any method in any method in any method in any method in any method in any method in the` com.example.service`. 3. Configure Spring Aop: To use the cut type, we need to configure in the Spring configuration file.Here are some basic example configurations: <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <bean id="loggingAspect" class="com.example.aspect.LoggingAspect" /> <aop:config> <aop:aspect id="beforeAspect" ref="loggingAspect"> <aop:before method="beforeAdvice" pointcut="execution(* com.example.service.*.*(..))" /> </aop:aspect> </aop:config> </beans> In the above configuration example, we are defined as Spring Bean through the `<bean>` `` Loggingaspect`, and configure a cut surface named `BEFOREASPECT`.In the cutting surface configuration, we are associated with a specific cut point (through the definition of the `PointCut` attribute) by` `AOP: Before>` `` `` PointCut` attribute definition). 4. Application cut surface: Finally, we need to apply the surface in the application.This can be implemented by quoting Spring Bean in the ServiceMix component.The following is an example of a servicemix component using Spring Bean: <bean id="myComponent" class="com.example.MyComponent"> <property name="loggingAspect" ref="loggingAspect" /> </bean> In the above example, we injected the `Loggingaspect` Bean into the` Loggingaspect` attribute in `mycomponent` bean. The above is the best practice in Apache Servicemix :: Bundles :: Spring Aop.By using AOP, we can achieve the purpose of separating the cross -cutting point from the core business logic, thereby improving the maintenance and reusability of the code.