extensions's Introduction

Extensions

How to use

Create your extension and add it to extensions file in resources.

extensions example:

ru.kdev.extensions.example.ExtenstionMyClass
ru.kdev.extensions.example.ExtenstionMyAnotherClass

Run your jar file with javaagent extensions-core-XXX-SNAPSHOT.jar

Run command example:

java -javaagent:extensions-core-1.0-SNAPSHOT.jar -jar myjar.jar

Example

Your extension class:

@Extension(classes = { MyClass.class })
public class ExtensionMyClass {

    @TargetField
    private int a;

    @Inject(method = { "printA" }, at = Inject.At.TOP)
    public void printAInject() {
        System.out.println("Hello from inject!");
    }
    
    @Inject(method = { "getA" }, at = Inject.At.BOTTOM, changeReturn = true)
    public int getAInject() {
        return a * 2;
    }
    
    @Inject(method = { "otherMethod" }, at = Inject.At.REWRITE)
    public void otherMethodInject() {
        System.out.println("rewrited");
    }
}

Your class:

public class MyClass {

    private int a = 120;
    
    public void printA() {
        System.out.println(a);
    }
    
    public void otherMethod() {
        System.out.println("not rewrited");
    }
    
    public int getA() {
        return a;
    }
}

Output:

public class MyClass {

    private int a = 120;
    
    public void printA() {
        System.out.println("Hello from inject!");
        System.out.println(a);
    }
    
    public void otherMethod() {
        System.out.println("rewrited");
    }
    
    public int getA() {
        return a * 2;
    }
}

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