| // Copyright 2006 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.ioc.services;
|
|
|
| import org.apache.tapestry.ioc.util.StrategyRegistry;
|
|
|
| /**
|
| * A service implementation builder that operates around a {@link StrategyRegistry}, implementing a
|
| * version of the Gang of Four Strategy pattern.
|
| * <p/>
|
| * The constructed service is configured with a number of adapters (that implement the same service
|
| * interface). Method invocations on the service are routed to one of the adapters.
|
| * <p/>
|
| * The first parameter of each method is used to select the appropriate adapter.
|
| * <p/>
|
| * The ideal interface for use with this builder has only one method.
|
| */
|
| public interface StrategyBuilder
|
| {
|
| /**
|
| * Given a number of adapters implementing the service interface, builds a "dispatcher"
|
| * implementations that delegates to the one of the adapters. It is an error if any of the
|
| * methods takes no parameters.
|
| *
|
| * @param <S> the service interface type
|
| * @param registry defines the adapters based on parameter type (of the first parameter)
|
| * @return a service implementation
|
| */
|
| <S> S build(StrategyRegistry<S> registry);
|
| }
|