Byte Buddy 和 OSGi Weaving Hook

Question

我想将 Byte Buddy 与 OSGi 编织钩子一起使用。

例如，可以像这样将 Javassist 与 OSGi 编织钩子一起使用：

//... other imports
import org.osgi.framework.hooks.weaving.WeavingHook;
import org.osgi.framework.hooks.weaving.WovenClass;

@Component (immediate = true)
public class MyWeavingHook implements WeavingHook {

    @Activate
    public void activate(ComponentContext ctx) {
        System.out.print("Activating demo weaving hook...");
    }

    @Override
    public void weave(WovenClass wovenClass) {
        System.out.println("Weaving hook called on " + wovenClass.getClassName());
        if (wovenClass.getClassName().equals("DecoratedTestServiceImpl")) {
            try (InputStream is = new ByteArrayInputStream(wovenClass.getBytes())) {
                ClassPool pool = ClassPool.getDefault();
                CtClass ctClass = pool.makeClass(is);
                ctClass.getDeclaredMethod("ping").setBody("return \"WAIVED\";");
                wovenClass.setBytes(ctClass.toBytecode());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }

}

字节好友如何处理wovenClass？我看到我可以像这样得到字节码：

byte[] classBytes = new ByteBuddy()
                .subclass(AClass.class)
                .name("MyClass")
                .method(named("theMethod"))
                .intercept(FixedValue.value("Hello World!"))
                .make()
                .getBytes();
wovenClass.setBytes(classBytes);

但我看不出如何将 wovenClass 字节码作为输入提供给 Byte Buddy。我需要这样的东西：

new ByteBuddy().rebase(wovenClass.getBytes())...

Answer 1

rebase 方法被重载并接受 ClassFileLocator 作为第二个参数。您可以通过提供显式映射直接提供 class 字节：

ClassFileLocator.Simple.of(wovenClass.getTypeDescription().getName(), wovenClass.getBytes())

Byte Buddy 和 OSGi Weaving Hook

Byte Buddy and OSGi Weaving Hook

java

osgi

byte-buddy