| package org.apache.turbine.services; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| /** |
| * Interface for telling Turbine that the implementation class |
| * is an external service provider therefore can be used for looking |
| * up services not found by the Turbine implementation. It is |
| * assumed that the referenced service container handles the |
| * complete lifecycle of its services. |
| * |
| * @author <a href="mailto:siegfried.goeschl@it20one.at">Siegfried Goeschl</a> |
| */ |
| public interface TurbineServiceProvider |
| { |
| /** |
| * Returns an instance of the requested service. If the |
| * given service is not available/found we throw a RuntimeException |
| * since this is less intrusive. |
| * |
| * @param roleName the name of the requested service |
| * @return an instance of the service |
| * @throws InstantiationException the service could not be instantiated |
| */ |
| Object get(String roleName) throws InstantiationException; |
| |
| /** |
| * Releases the instance you got before. This is only really |
| * required when not working with service singletons. |
| * |
| * @param component the component to release |
| */ |
| void release(Object component); |
| |
| /** |
| * Is the service known to the service container? |
| * @param roleName the name of the requested service |
| * @return true if the service is known to the provider |
| */ |
| boolean exists(String roleName); |
| } |