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tessl/maven-cglib--cglib-nodep

Code generation library for creating dynamic proxies, bean utilities, and fast reflection alternatives with bundled dependencies

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CGLib (cglib-nodep)

CGLib is a powerful Java code generation library that enables dynamic class creation, proxy generation, and bytecode manipulation at runtime. The cglib-nodep distribution bundles CGLib with all dependencies (including ASM) into a single JAR without external dependencies, making it ideal for applications that need to avoid dependency conflicts.

Package Information

  • Package Name: cglib-nodep
  • Package Type: maven
  • Language: Java
  • Installation: 
    <dependency>
  <groupId>cglib</groupId>
  <artifactId>cglib-nodep</artifactId>
  <version>3.3.0</version>
</dependency>

Core Imports

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;
import net.sf.cglib.beans.BeanCopier;
import net.sf.cglib.reflect.FastClass;

Basic Usage

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

// Create enhanced proxy class
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(MyClass.class);
enhancer.setCallback(new MethodInterceptor() {
    public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable {
        System.out.println("Before method: " + method.getName());
        Object result = proxy.invokeSuper(obj, args);
        System.out.println("After method: " + method.getName());
        return result;
    }
});

MyClass proxy = (MyClass) enhancer.create();
proxy.someMethod(); // Will be intercepted

Architecture

CGLib is organized around several key components:

  • Proxy Generation: Dynamic creation of enhanced classes that extend existing classes or implement interfaces
  • Method Interception: Callback-based system for intercepting and modifying method calls
  • Bean Utilities: High-performance utilities for JavaBean manipulation (copying, mapping, generation)
  • Fast Reflection: Optimized alternatives to Java reflection for method/constructor invocation
  • Code Generation: Low-level bytecode generation framework using ASM (repackaged to avoid conflicts)
  • Runtime Enhancement: Dynamic class modification and proxy creation without compile-time dependencies

Capabilities

Proxy and Enhancement

Core proxy generation functionality for creating enhanced classes with method interception, callback support, and dynamic interface implementation.

public class Enhancer {
    public static Object create(Class type, Callback callback);
    public static Object create(Class superclass, Class[] interfaces, Callback callback); 
    public void setSuperclass(Class superclass);
    public void setCallback(Callback callback);
    public Object create();
}

public interface MethodInterceptor extends Callback {
    Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable;
}

public class MethodProxy {
    public Object invoke(Object obj, Object[] args) throws Throwable;
    public Object invokeSuper(Object obj, Object[] args) throws Throwable;
}

Proxy and Enhancement

Bean Utilities

High-performance JavaBean manipulation utilities including property copying, dynamic bean generation, and Map-based bean access.

public abstract class BeanCopier {
    public static BeanCopier create(Class source, Class target, boolean useConverter);
    public abstract void copy(Object from, Object to, Converter converter);
}

public abstract class BeanMap implements Map {
    public static BeanMap create(Object bean);
    public abstract Object get(Object bean, Object key);
    public abstract Object put(Object bean, Object key, Object value);
}

public class BeanGenerator {
    public void addProperty(String name, Class type);
    public Object create();
}

Bean Utilities

Reflection Utilities

Fast alternatives to Java reflection for method and constructor invocation, plus method delegation utilities.

public abstract class FastClass {
    public static FastClass create(Class type);
    public abstract Object invoke(String name, Class[] parameterTypes, Object obj, Object[] args) throws InvocationTargetException;
    public abstract Object newInstance() throws InvocationTargetException;
    public abstract FastMethod getMethod(String name, Class[] parameterTypes);
}

public class FastMethod {
    public Object invoke(Object obj, Object[] args) throws InvocationTargetException;
    public Method getJavaMethod();
}

public abstract class MethodDelegate {
    public static MethodDelegate create(Object target, String methodName, Class iface);
}

Reflection Utilities

Core Utilities

Essential utilities for key generation, transformations, predicates, and low-level code generation support.

public abstract class KeyFactory {
    public static KeyFactory create(Class keyInterface);
    public abstract Object newInstance(Object[] args);
}

public interface Converter {
    Object convert(Object value, Class target, Object context);
}

public interface Transformer {
    Object transform(Object value);
}

public interface Predicate {
    boolean evaluate(Object arg);
}

Core Utilities

Transformation Utilities

Bytecode transformation utilities for modifying classes at load time and generating transformed versions of existing classes.

public class TransformingClassLoader extends AbstractClassLoader {
    public TransformingClassLoader(ClassLoader parent, ClassFilter filter, ClassTransformerFactory t);
}

public abstract class ClassTransformer extends ClassVisitor {
    public abstract void setTarget(ClassVisitor target);
}

public interface ClassFilter {
    boolean accept(String className);
}

Transformation Utilities

Utility Classes

High-performance utility classes for string switching and parallel array sorting operations.

public abstract class StringSwitcher {
    public static StringSwitcher create(String[] strings, int[] ints, boolean fixedInput);
    public abstract int intValue(String s);
}

public abstract class ParallelSorter {
    public static ParallelSorter create(Object[] arrays);
    public abstract void quickSort(int index);
}

Utility Classes

Types

Core Callback Types

public interface Callback {
    // Marker interface for all callback types
}

public interface MethodInterceptor extends Callback {
    Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy) throws Throwable;
}

public interface FixedValue extends Callback {
    Object loadObject() throws Exception;
}

public interface LazyLoader extends Callback {
    Object loadObject() throws Exception;
}

public interface Dispatcher extends Callback {
    Object loadObject() throws Exception;
}

public interface NoOp extends Callback {
    // Marker interface - no methods
}

public interface CallbackFilter {
    int accept(Method method);
}

Factory Interface

public interface Factory {
    Object newInstance(Callback callback);
    Object newInstance(Callback[] callbacks);
    Callback getCallback(int index);
    void setCallback(int index, Callback callback);
    void setCallbacks(Callback[] callbacks);
    Callback[] getCallbacks();
}

Exception Types

public class BulkBeanException extends RuntimeException {
    public BulkBeanException(String message, int index);
    public int getIndex();
}

public class UndeclaredThrowableException extends RuntimeException {
    public UndeclaredThrowableException(Throwable t);
    public Throwable getUndeclaredThrowable();
}
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mavenpkg:maven/cglib/cglib-nodep@3.3.x
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