Comparison of CGLIB FULL framework and other Java -class library dynamic proxy solutions
Comparison of CGLIB FULL framework and other Java -class library dynamic proxy solutions
Dynamic proxy is a common design pattern that allows the proxy class during runtime to intercept and enhance before and after the call of the original object.In Java, there are multiple dynamic proxy solutions to choose from, including the CGLIB FULL framework and other Java class libraries.This article will compare and analyze the advantages and disadvantages of the CGLIB FULL framework and other Java -class library dynamic proxy solutions.
Introduction and characteristics of CGLIB FULL framework
CGLIB is a powerful, high -performance code generating library for generating Java -type proxy objects.Compared with the traditional interface -based proxy (JDK dynamic proxy), the CGLIB FULL framework allows the proxy class to achieve proxy during runtime without the need to implement the interface.The main features of the CGLIB FULL framework are as follows:
1. The proxy class generated by CGLIB is a subclass of the target class, so it can represent the non -interface type class.
2. CGLIB uses the ASM bytecode operation framework to operate the byte code, so the proxy class performance is high.
3. The CGLIB FULL framework supports two types of proxy: Enhancer and Methodinterceptor.
Second, other Java class library dynamic proxy solutions
In addition to the CGLIB FULL framework, there are other dynamic proxy solutions in Java, such as JDK dynamic proxy and Javaassist.
1. JDK dynamic proxy:
The JDK dynamic agent is a dynamic agency mechanism provided by the Java standard library.It requires the target class to implement one or more interfaces, and the generated proxy objects also implement these interfaces.The advantage of the JDK dynamic proxy is that it is part of the Java standard library, so there is no need to introduce additional dependencies.However, it can only represent the type of interface type, and it cannot proxy the non -interface type class.
Below is a sample code using JDK dynamic proxy:
public interface Hello {
void sayHello();
}
public class HelloImpl implements Hello {
public void sayHello() {
System.out.println("Hello World!");
}
}
public class HelloProxy implements InvocationHandler {
private Object target;
public HelloProxy(Object target) {
this.target = target;
}
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
System.out.println("Before method invocation");
Object result = method.invoke(target, args);
System.out.println("After method invocation");
return result;
}
public static void main(String[] args) {
Hello hello = new HelloImpl();
HelloProxy proxy = new HelloProxy(hello);
Hello helloProxy = (Hello) Proxy.newProxyInstance(HelloProxy.class.getClassLoader(), new Class<?>[]{Hello.class}, proxy);
helloProxy.sayHello();
}
}
2. Javassi ：
Javaassist is a bytecode operating library that provides a simple API to dynamically modify the byte code of the class.Compared with the CGLIB FULL framework, the main advantage of Javaassist is that it provides a simpler and easier to use programming model.However, the performance of Javaassist may be relatively low, and some of its advanced functions may not be as strong as the CGLIB FULL framework.
Third, the advantages and disadvantages of the CGLIB FULL framework
After comparing with other dynamic agency solutions, we can summarize some of the advantages and disadvantages of the CGLIB FULL framework:
Advantage:
1. The CGLIB FULL framework is a proxy class during runtime, and the target class does not require the interface of the target class. Therefore, it can represent the non -interface type class.
2. The CGLIB FULL framework uses the ASM bytecode operation framework to operate the byte code. The proxy class performance is high.
3. Compared to the JDK dynamic agent, the CGLIB FULL framework does not rely on the Java standard library, so it can make developers choose to use more flexibly.
Disadvantages:
1. The CGLIB FULL framework needs to be introduced additional dependencies, which is relatively complicated in use.
2. Because the generated proxy class is a sub -class of the target class, there may be some constraints in some scenarios.For example, unable to proxy the final class, final method, or Private method.
Summarize:
The CGLIB FULL framework is a powerful and high -performance dynamic proxy solution, which is suitable for scenes that do not have strict requirements on the interface.Its advantage is that it can represent non -interface types and has high performance.However, the JDK dynamic agent may be a more suitable choice for the simple and easy -to -use scene.Javaassist provides a programmatic model that is easier to master, but it may be slightly lower in performance.
The above is the comparison and advantages and disadvantages of the CGLIB FULL framework and other Java -class library dynamic proxy solutions. I hope to provide readers with some references.
