How to integrate Apache Servicemix :: Bundles :: Aspectj framework
How to integrate Apache Servicemix :: Bundles :: Aspectj framework
Apache ServiceMix is an open source service integration (ESB) container for constructing and managing enterprise -level services.
ASPECTJ is a Java language -oriented -oriented programming (AOP) framework. It can help developers add, modify, and control the horizontal section of the code in a statement without modifying the source code.
In this article, we will discuss how to integrate Apache Servicemix :: Bundles :: Aspectj framework in the Java class library project.
Step 1: Add Apache Servicemix :: bundles :: Aspectj dependency package to the project
First of all, we need to add Apache Servicemix :: Bundles :: Aspectj dependencies in the project construction file (such as Maven's pom.xml).The corresponding operation can be performed according to the construction tool used by the project.
Maven dependence configuration example:
<dependencies>
<dependency>
<groupId>org.apache.servicemix.bundles</groupId>
<artifactId>org.apache.servicemix.bundles.aspectj</artifactId>
<version>1.9.7_1</version>
</dependency>
</dependencies>
Gradle dependency configuration example:
groovy
dependencies {
implementation 'org.apache.servicemix.bundles:org.apache.servicemix.bundles.aspectj:1.9.7_1'
}
Step 2: Create aspectj cut
Create a class in the Java library project and use ASPECTJ annotation definition to define the cut surface.The following is a simple example:
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
@Aspect
public class LoggingAspect {
@Before("execution(* com.example.MyClass.myMethod(..))")
public void beforeMyMethod() {
System.out.println("Before executing myMethod");
}
}
In the above code, we define a cut -type loggingaspect and declare a @Beface notification in which it will print a log before the mymethod method of the com.example.myclass class.
Step 3: Configure aspectj cut
In order to enable the aspectj cut surface, we need to configure the corresponding configuration file in the project.The specific configuration method depends on the framework and container of the project.
If you are using Apache ServiceMix as the project container, you can add the following configuration in the configuration file of the servicemix (such as ETC/ORG.OPS4J.pax. Logging.cfg):
log4j.logger.org.aspectj=INFO
This will enable the log output of ASPECTJ to see the execution of the cut surface in the process of development and debugging.
Step 4: Use ASPECTJ Noodles in the application
Finally, in your application, apply ASPECTJ surface to the corresponding class or method.The following is a simple example:
import com.example.LoggingAspect;
public class MyApp {
public static void main(String[] args) {
// Create a loggingaspect example
LoggingAspect loggingAspect = new LoggingAspect();
// Use ASPECTJ Noodles
MyClass myObj = new MyClass();
myObj.myMethod();
}
}
In the above code, we apply loggingaspect to the MyMethod method of the MyClass class.
When running an application, you should be able to see a log output similar to "Before Execution MyMethod", which proves that the aspectjine surface has been successfully applied.
Summarize:
By integrated Apache ServiceMix :: Bundles :: Aspectj framework, you can use the cut -the -face programming point in the Java library to add, modify, and control the cross -section of the code in a more flexible and maintainable way.The above steps provide a simple example, you can adjust and expand according to the actual needs of the project.
