    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
    015    package org.apache.tapestry5.ioc.services;
    016
    017    import org.apache.tapestry5.ioc.util.StrategyRegistry;
    018
    019    import 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     */
    032    public 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    }