aopalliance解析(二) Joinpoint

Joinpoint

      aopalliance1.0.jar 和 aopalliance-1.0-sources.jar源码包中 类不一致。发行jar中没有 FieldAccess。

            

Joinpoint有两个继承实现FieldAccess 和  Invocation。

Invocation

  Invocation  运行时的 方法调用 

   

/** * This interface represents an invocation in the program. *此接口表示程序中一个调用 * <p>An invocation is a joinpoint and can be intercepted by an * interceptor. * * @author Rod Johnson */public interface Invocation extends Joinpoint {      /**    * Get the arguments as an array object.    * It is possible to change element values within this    * array to change the arguments.    *获取方法调用的所有参数存储中数组对象中    *可以改变上述数组中元素值从而改变方法传入的参数    * @return the argument of the invocation */   Object[] getArguments();}

Invocation 有两个继承的子接口:ConstructorInvocation和MethodInvocation。

/** * Description of an invocation to a constuctor, given to an * interceptor upon construtor-call.  * 此接口是对构造器调用的描述，使用此构造器运行时调用描述 ，拦截器可以拦截到构造器调用。 * <p>A constructor invocation is a joinpoint and can be intercepted * by a constructor interceptor. * * @see ConstructorInterceptor */public interface ConstructorInvocation extends Invocation {    /**     * Gets the constructor being called.     *获取 被调用的构造器     * <p>This method is a frienly implementation of the {@link     * Joinpoint#getStaticPart()} method (same result).     *     * @return the constructor being called. */    Constructor getConstructor();}

import java.lang.reflect.Method;/** * Description of an invocation to a method, given to an interceptor * upon method-call. * 此接口是方法调用的描述，使用此方法调用运行时调用描述 ，拦截器可以拦截到方法调用。 * <p>A method invocation is a joinpoint and can be intercepted by a method * interceptor. * * @see MethodInterceptor */public interface MethodInvocation extends Invocation{    /**     * Gets the method being called.     *获取 被调用的方法     * <p>This method is a frienly implementation of the {@link     * Joinpoint#getStaticPart()} method (same result).     *     * @return the method being called.     */    Method getMethod();}

FieldAccess

    域访问、字段属性的访问。

/** * This interface represents a field access in the program. * * <p>A field access is a joinpoint and can be intercepted by a field * interceptor. *  域访问 joinpoint 可以被 field拦截器拦截 * @see FieldInterceptor */public interface FieldAccess extends Joinpoint {   /** The read access type (see {@link #getAccessType()}). */   int READ=0;   /** The write access type (see {@link #getAccessType()}). */   int WRITE=1;    /**     * Gets the field being accessed.     *返回 被访问的 field     * <p>This method is a frienly implementation of the {@link     * Joinpoint#getStaticPart()} method (same result).     *此方法是{@link Joinpoint#getStaticPart()}方法的友好(frienly 应为 friendly)实现     * @return the field being accessed.  */    Field getField();   /**    * Gets the value that must be set to the field.    *获取设置到field的值    * <p>This value can be intercepted and changed by a field    * interceptor.  值可以被field拦截器拦截和改变*/   Object getValueToSet();   /**    * Returns the access type.    *    * @return FieldAccess.READ || FieldAccess.WRITE */   int getAccessType();}