001// Copyright 2004, 2005 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.hivemind; 016 017import java.util.List; 018 019import org.apache.hivemind.internal.Module; 020 021/** 022 * Interface defining an interceptor factory, an object that can create 023 * an interceptor. Interceptors are objects that implement a particular 024 * interface, adding logic before or after invoking methods on a wrapped 025 * object (implementing the same instance). 026 * 027 * <p> 028 * Implementations must be stateless and multi-threaded. 029 * An interceptor may only be applied once to any single service. 030 * The factory will only be invoked once for any single service (even in the case 031 * of non-standard service models such as threaded and pooled). 032 * 033 * @author Howard Lewis Ship 034 */ 035public interface ServiceInterceptorFactory 036{ 037 /** 038 * Creates an interceptor and pushes it onto the interceptor stack. 039 */ 040 public void createInterceptor(InterceptorStack stack, Module invokingModule, List parameters); 041}