LoadTimeWeaver


1   /*
2    * Copyright 2002-2006 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.instrument.classloading;
18  
19  import java.lang.instrument.ClassFileTransformer  ;
20  
21  /**
22   * Defines the contract for adding one or more
23   * {@link ClassFileTransformer ClassFileTransformers} to a
24   * {@link ClassLoader} - typically the current context class loader.
25   * 
26   * <p>Implementations may of course provide their own class loader as well.
27   *
28   * @author Rod Johnson
29   * @author Costin Leau
30   * @since 2.0
31   */
32  public interface LoadTimeWeaver {
33  
34      /**
35       * Add a class file transformer to be applied by this load-time weaver.
36       * @param transformer the class file transformer to add
37       */
38      void addTransformer(ClassFileTransformer   transformer);
39      
40      /**
41       * Return a class loader that supports instrumentation through AspectJ-style load-time
42       * weaving based on user-defined {@link ClassFileTransformer ClassFileTransformers}.
43       * <p>May be the current class loader, or a class loader created by this
44       * {@link LoadTimeWeaver} instance.
45       * @return a class loader that supports instrumentation through AspectJ-style load-time
46       * weaving based on user-defined {@link ClassFileTransformer ClassFileTransformers}
47       */
48      ClassLoader   getInstrumentableClassLoader();
49      
50      /**
51       * Return a throwaway class loader, enabling classes to be loaded and
52       * inspected without affecting the parent class loader.
53       * <p>Should <i>not</i> return the same instance of the {@link ClassLoader}
54       * returned from an invocation of {@link #getInstrumentableClassLoader()}.
55       * @return a temporary throwaway class loader; should return a new
56       * instance for each call, with no existing state
57       */
58      ClassLoader   getThrowawayClassLoader();
59  
60  }
61
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