Quelle InstrumentableClassLoader.java
Sprache: JAVA
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.
*/ package org.apache.tomcat;
import java.lang.instrument.ClassFileTransformer;
/** * Specifies a class loader capable of being decorated with * {@link ClassFileTransformer}s. These transformers can instrument * (or weave) the byte code of classes loaded through this class loader * to alter their behavior. Currently only * {@link org.apache.catalina.loader.WebappClassLoaderBase} implements this * interface. This allows web application frameworks or JPA providers * bundled with a web application to instrument web application classes * as necessary. * <p> * You should always program against the methods of this interface * (whether using reflection or otherwise). The methods in * {@code WebappClassLoaderBase} are protected by the default security * manager if one is in use. * * @since 8.0, 7.0.64
*/ publicinterface InstrumentableClassLoader {
/** * Adds the specified class file transformer to this class loader. The * transformer will then be able to instrument the bytecode of any * classes loaded by this class loader after the invocation of this * method. * * @param transformer The transformer to add to the class loader * @throws IllegalArgumentException if the {@literal transformer} is null.
*/ void addTransformer(ClassFileTransformer transformer);
/** * Removes the specified class file transformer from this class loader. * It will no longer be able to instrument the byte code of any classes * loaded by the class loader after the invocation of this method. * However, any classes already instrumented by this transformer before * this method call will remain in their instrumented state. * * @param transformer The transformer to remove
*/ void removeTransformer(ClassFileTransformer transformer);
/** * Returns a copy of this class loader without any class file * transformers. This is a tool often used by Java Persistence API * providers to inspect entity classes in the absence of any * instrumentation, something that can't be guaranteed within the * context of a {@link ClassFileTransformer}'s * {@link ClassFileTransformer#transform(ClassLoader, String, Class, * java.security.ProtectionDomain, byte[]) transform} method. * <p> * The returned class loader's resource cache will have been cleared * so that classes already instrumented will not be retained or * returned. * * @return the transformer-free copy of this class loader.
*/
ClassLoader copyWithoutTransformers();
}
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