Dynamic proxy in the Java class library through FLUENT Reflection Parent framework
Dynamic proxy in the Java class library through FLUENT Reflection Parent framework
Overview:
Fluent Reflection Parent is a Java class library that provides a simple way to achieve dynamic proxy.This article will introduce how to use the Fluent Reflection Parent framework to implement the dynamic agent in the Java library and provide a complete programming code and related configuration.
Dynamic proxy:
In Java programming, the dynamic agent is achieved by achieving an interface and generating an agent object.The proxy object calls the method of the original object to other objects to achieve additional logic or operation.Dynamic proxy is usually used in AOP (facing cut -out programming) to achieve the separation and management of cross -sectional attention points.
FLUENT Reflection Parent framework:
FLUENT Reflection Parent is a Java class library that uses simple Fluent API (smooth API) to achieve dynamic proxy.It encapsulates Java's reflection API and provides a simpler and intuitive way to generate proxy objects.
Implementation steps:
The following is the steps to use Fluent Reflection Parent framework to achieve dynamic proxy:
Step 1: Introduce dependencies
First of all, you need to add the dependencies of the FLUENT Reflection Parent framework to the construction file of the project.You can add the following dependencies through Maven or Gradle:
Maven:
<dependency>
<groupId>org.kantega.revapi</groupId>
<artifactId>fluent-reflections-parent</artifactId>
<version>1.13.0</version>
</dependency>
Gradle:
gradle
implementation 'org.kantega.revapi:fluent-reflections-parent:1.13.0'
Step 2: Create an interface of the agent
Creating a Java interface represents the function of the object of the agent.
public interface MyInterface {
void doSomething();
}
Step 3: Realize the class of the agent
Create a class that implements the interface, which will be used as an agent.
public class MyImplementation implements MyInterface {
@Override
public void doSomething() {
System.out.println("Doing something");
}
}
Step 4: Create proxy objects
Use Fluent Reflection Parent framework to create an agent object, which will execute additional logic before or after calling the proxy object.
public class ProxyExample {
public static void main(String[] args) {
MyInterface proxy = FluentReflections.proxy(MyInterface.class)
.before((proxyObject, method, argsArray) -> {
System.out.println("Before method call");
})
.after((proxyObject, method, argsArray, result) -> {
System.out.println("After method call");
})
.build(new MyImplementation());
proxy.doSomething();
}
}
Analysis:
In the above code, first create a proxy object by calling the `FLUENTREFLECTIONS.Proxy ()` method.Then, use the method of `.beface () and` .aFTER () `to specify the additional logic executed before and after the call of the proxy object, respectively.Finally, generate an agent object by calling the method by calling `.build ()`.
When executing the method of `proxy.dosomething ()`, the proxy object is printed "BeFore Method Call" before calling the acting object's `dosomething ()` method, and print the "After Method Call" after calling.
Summarize:
Through the Fluent Reflection Parent framework, we can simply and intuitively realize the dynamic proxy in the Java class library.This framework provides a smooth API that allows us to easily generate proxy objects and perform additional logic before or after the method call.In this way, we can easily implement the separation and management of horizontal cutting attention in AOP.
