org.springframework.instrument.classloading

## 类 ReflectiveLoadTimeWeaver

- java.lang.Object
- - org.springframework.instrument.classloading.ReflectiveLoadTimeWeaver

- 所有已实现的接口:
    LoadTimeWeaver

      public class ReflectiveLoadTimeWeaver
      extends Object
      implements LoadTimeWeaver

  `LoadTimeWeaver` which uses reflection to delegate to an underlying ClassLoader with well-known transformation hooks. The underlying ClassLoader is expected to support the following weaving methods (as defined in the `LoadTimeWeaver` interface):
  - `public void addTransformer(java.lang.instrument.ClassFileTransformer)`: for registering the given ClassFileTransformer on this ClassLoader
  - `public ClassLoader getThrowawayClassLoader()`: for obtaining a throwaway class loader for this ClassLoader (optional; ReflectiveLoadTimeWeaver will fall back to a SimpleThrowawayClassLoader if that method isn't available)

  Please note that the above methods must reside in a class that is publicly accessible, although the class itself does not have to be visible to the application's class loader.

  The reflective nature of this LoadTimeWeaver is particularly useful when the underlying ClassLoader implementation is loaded in a different class loader itself (such as the application server's class loader which is not visible to the web application). There is no direct API dependency between this LoadTimeWeaver adapter and the underlying ClassLoader, just a 'loose' method contract.

  This is the LoadTimeWeaver to use e.g. with the Resin application server version 3.1+.

  从以下版本开始:
    2.0
  作者:
    Costin Leau, Juergen Hoeller
  另请参阅:
    `addTransformer(java.lang.instrument.ClassFileTransformer)`, `getThrowawayClassLoader()`, `SimpleThrowawayClassLoader`

- - ### 构造器概要

    构造器
    构造器和说明
    `ReflectiveLoadTimeWeaver()` Create a new ReflectiveLoadTimeWeaver for the current context class loader, which needs to support the required weaving methods.
    `ReflectiveLoadTimeWeaver(ClassLoader classLoader)` Create a new SimpleLoadTimeWeaver for the given class loader.

  - ### 方法概要

    所有方法 实例方法 具体方法
    限定符和类型 | 方法和说明
    --- | ---
    `void` | `addTransformer(ClassFileTransformer transformer)` Add a `ClassFileTransformer` to be applied by this `LoadTimeWeaver`.
    `ClassLoader` | `getInstrumentableClassLoader()` Return a `ClassLoader` that supports instrumentation through AspectJ-style load-time weaving based on user-defined `ClassFileTransformers`.
    `ClassLoader` | `getThrowawayClassLoader()` Return a throwaway `ClassLoader`, enabling classes to be loaded and inspected without affecting the parent `ClassLoader`.

    - ### 从类继承的方法 java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### 构造器详细资料

    - #### ReflectiveLoadTimeWeaver

          public ReflectiveLoadTimeWeaver()

      Create a new ReflectiveLoadTimeWeaver for the current context class loader, which needs to support the required weaving methods.

    - #### ReflectiveLoadTimeWeaver

          public ReflectiveLoadTimeWeaver(@Nullable
                                          ClassLoader classLoader)

      Create a new SimpleLoadTimeWeaver for the given class loader.
      参数:
        `classLoader` - the `ClassLoader` to delegate to for weaving (must support the required weaving methods).
      抛出:
        `IllegalStateException` - if the supplied `ClassLoader` does not support the required weaving methods

  - ### 方法详细资料

    - #### addTransformer

          public void addTransformer(ClassFileTransformer transformer)

      从接口复制的说明: `LoadTimeWeaver`
      Add a `ClassFileTransformer` to be applied by this `LoadTimeWeaver`.
      指定者:
        `addTransformer` 在接口中 `LoadTimeWeaver`
      参数:
        `transformer` - the `ClassFileTransformer` to add

    - #### getInstrumentableClassLoader

          public ClassLoader getInstrumentableClassLoader()

      从接口复制的说明: `LoadTimeWeaver`
      Return a `ClassLoader` that supports instrumentation through AspectJ-style load-time weaving based on user-defined `ClassFileTransformers`.

      May be the current `ClassLoader`, or a `ClassLoader` created by this `LoadTimeWeaver` instance.

      指定者:
        `getInstrumentableClassLoader` 在接口中 `LoadTimeWeaver`
      返回:
        the `ClassLoader` which will expose instrumented classes according to the registered transformers

    - #### getThrowawayClassLoader

          public ClassLoader getThrowawayClassLoader()

      从接口复制的说明: `LoadTimeWeaver`
      Return a throwaway `ClassLoader`, enabling classes to be loaded and inspected without affecting the parent `ClassLoader`.

      Should not return the same instance of the `ClassLoader` returned from an invocation of `LoadTimeWeaver.getInstrumentableClassLoader()`.

      指定者:
        `getThrowawayClassLoader` 在接口中 `LoadTimeWeaver`
      返回:
        a temporary throwaway `ClassLoader`; should return a new instance for each call, with no existing state