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/*
 * Copyright 2002-2006 the original author or authors.
 *
 * 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.
 */

package org.springframework.instrument.classloading;

import java.lang.instrument.ClassFileTransformer;

/**
 * Defines the contract for adding one or more
 * {@link ClassFileTransformer ClassFileTransformers} to a
 * {@link ClassLoader} - typically the current context class loader.
 * 
 * 

Implementations may of course provide their own class loader as well. * * @author Rod Johnson * @author Costin Leau * @since 2.0 */ public interface LoadTimeWeaver { /** * Add a class file transformer to be applied by this load-time weaver. * @param transformer the class file transformer to add */ void addTransformer(ClassFileTransformer transformer); /** * Return a class loader that supports instrumentation through AspectJ-style load-time * weaving based on user-defined {@link ClassFileTransformer ClassFileTransformers}. *

May be the current class loader, or a class loader created by this * {@link LoadTimeWeaver} instance. * @return a class loader that supports instrumentation through AspectJ-style load-time * weaving based on user-defined {@link ClassFileTransformer ClassFileTransformers} */ ClassLoader getInstrumentableClassLoader(); /** * Return a throwaway class loader, enabling classes to be loaded and * inspected without affecting the parent class loader. *

Should not return the same instance of the {@link ClassLoader} * returned from an invocation of {@link #getInstrumentableClassLoader()}. * @return a temporary throwaway class loader; should return a new * instance for each call, with no existing state */ ClassLoader getThrowawayClassLoader(); }





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