66 lines
2.5 KiB
Java
66 lines
2.5 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package javax.websocket;
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import java.lang.reflect.InvocationTargetException;
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import java.util.Iterator;
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import java.util.ServiceLoader;
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/**
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* Use the {@link ServiceLoader} mechanism to provide instances of the WebSocket
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* client container.
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*/
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public abstract class ContainerProvider {
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private static final String DEFAULT_PROVIDER_CLASS_NAME =
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"org.apache.tomcat.websocket.WsWebSocketContainer";
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/**
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* Create a new container used to create outgoing WebSocket connections.
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*
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* @return A newly created container.
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*/
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public static WebSocketContainer getWebSocketContainer() {
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WebSocketContainer result = null;
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ServiceLoader<ContainerProvider> serviceLoader =
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ServiceLoader.load(ContainerProvider.class);
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Iterator<ContainerProvider> iter = serviceLoader.iterator();
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while (result == null && iter.hasNext()) {
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result = iter.next().getContainer();
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}
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// Fall-back. Also used by unit tests
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if (result == null) {
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try {
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@SuppressWarnings("unchecked")
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Class<WebSocketContainer> clazz =
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(Class<WebSocketContainer>) Class.forName(
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DEFAULT_PROVIDER_CLASS_NAME);
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result = clazz.getConstructor().newInstance();
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} catch (ClassNotFoundException | InstantiationException | IllegalAccessException |
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IllegalArgumentException | InvocationTargetException | NoSuchMethodException |
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SecurityException e) {
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// No options left. Just return null.
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}
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}
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return result;
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}
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protected abstract WebSocketContainer getContainer();
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}
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