001 package groovy.lang; 002 003 /** 004 * Implementers of this interface can be registered in the ProxyMetaClass for 005 * notifications about method calls for objects managed by the ProxyMetaClass. 006 * See groovy/lang/InterceptorTest.groovy for details. 007 * @author Dierk Koenig 008 */ 009 public interface Interceptor { 010 /** 011 * This code is executed before the method is optionally called. 012 * @param object receiver object for the method call 013 * @param methodName name of the method to call 014 * @param arguments arguments to the method call 015 * @return any arbitrary result that replaces the result of the 016 * original method call only if doInvoke() returns false and afterInvoke() 017 * relays this result. 018 */ 019 Object beforeInvoke(Object object, String methodName, Object[] arguments); 020 /** 021 * This code is executed after the method is optionally called. 022 * @param object receiver object for the called method 023 * @param methodName name of the called method 024 * @param arguments arguments to the called method 025 * @param result result of the executed method call or result of beforeInvoke if method was not called 026 * @return any arbitrary result that can replace the result of the 027 * original method call. Typically, the result parameter is returned. 028 */ 029 Object afterInvoke(Object object, String methodName, Object[] arguments, Object result); 030 /** 031 * @return whether the target method should be invoked at all. 032 */ 033 boolean doInvoke(); 034 }