| /* |
| * 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. |
| */ |
| |
| package javax.websocket; |
| |
| import java.util.ServiceLoader; |
| |
| /** |
| * Provider class that allows the developer to get a reference to the implementation of the WebSocketContainer. The |
| * provider class uses the ServiceLoader to load an implementation of ContainerProvider. Specifically, the fully |
| * qualified classname of the container implementation of ContainerProvider must be listed in the |
| * META-INF/services/javax.websocket.ContainerProvider file in the implementation JAR file. |
| */ |
| public abstract class ContainerProvider { |
| |
| private static ServiceLoader<WebSocketContainer> loader = ServiceLoader.load(WebSocketContainer.class); |
| |
| /** |
| * Obtain a new instance of a WebSocketContainer. The method looks for the ContainerProvider implementation class in |
| * the order listed in the META-INF/services/javax.websocket.ContainerProvider file, returning the |
| * WebSocketContainer implementation from the ContainerProvider implementation that is not null. |
| * |
| * @return an implementation provided instance of type WebSocketContainer |
| */ |
| public static WebSocketContainer getWebSocketContainer() { |
| for (WebSocketContainer cntr : loader) { |
| return cntr; |
| } |
| return null; |
| } |
| |
| public ContainerProvider() { |
| } |
| |
| /** |
| * Load the container implementation. |
| * |
| * @return the implementation class |
| */ |
| protected abstract WebSocketContainer getContainer(); |
| |
| } |