org.rapidoid.cls.Proxies Maven / Gradle / Ivy
package org.rapidoid.cls;
import org.rapidoid.RapidoidThing;
import org.rapidoid.log.Log;
import org.rapidoid.u.U;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
/*
* #%L
* rapidoid-commons
* %%
* Copyright (C) 2014 - 2017 Nikolche Mihajlovski and contributors
* %%
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* #L%
*/
public class Proxies extends RapidoidThing {
@SuppressWarnings("unchecked")
public static T createProxy(InvocationHandler handler, Class... interfaces) {
return ((T) Proxy.newProxyInstance(interfaces[0].getClassLoader(), interfaces, handler));
}
public static T implement(final Object target, final InvocationHandler handler, Class... interfaces) {
final Class targetClass = target.getClass();
return createProxy(new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (method.getDeclaringClass().isAssignableFrom(targetClass)) {
return method.invoke(target, args);
}
return handler.invoke(proxy, method, args);
}
}, interfaces);
}
public static T tracer(Object target) {
return implementInterfaces(target, new InvocationHandler() {
@Override
public Object invoke(Object target, Method method, Object[] args) throws Throwable {
Log.trace("intercepting", "method", method.getName(), "args", Arrays.toString(args));
return method.invoke(target, args);
}
});
}
public static T implement(InvocationHandler handler, Class... classes) {
return implement(new InterceptorProxy(U.str(classes)), handler, classes);
}
public static T implementInterfaces(Object target, InvocationHandler handler) {
return implement(target, handler, Cls.getImplementedInterfaces(target.getClass()));
}
}