    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}