001// Copyright 2006, 2008 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.tapestry5.ioc.services; 016 017import org.apache.tapestry5.ioc.util.StrategyRegistry; 018 019import java.util.Map; 020 021/** 022 * A service implementation builder that operates around a {@link StrategyRegistry}, implementing a version of the Gang 023 * of Four Strategy pattern. 024 * <p/> 025 * The constructed service is configured with a number of adapters (that implement the same service interface). Method 026 * invocations on the service are routed to one of the adapters. 027 * <p/> 028 * The first parameter of each method is used to select the appropriate adapter. 029 * <p/> 030 * The ideal interface for use with this builder has only one method. 031 */ 032public interface StrategyBuilder 033{ 034 /** 035 * Given a number of adapters implementing the service interface, builds a "dispatcher" implementations that 036 * delegates to the one of the adapters. It is an error if any of the methods takes no parameters. 037 * 038 * @param <S> the service interface type 039 * @param registry defines the adapters based on parameter type (of the first parameter) 040 * @return a service implementation 041 */ 042 <S> S build(StrategyRegistry<S> registry); 043 044 /** 045 * @param registrations map frm class to the adapter type 046 * @param <S> 047 * @return the dispatcher 048 * @since 5.1.0.0 049 */ 050 <S> S build(Class<S> adapterType, Map<Class, S> registrations); 051}