Java tutorial
/* * Copyright 2002-2013 the original author or authors. * * 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.springframework.web.socket.server.support; import java.io.IOException; import javax.websocket.Endpoint; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.http.server.ServerHttpRequest; import org.springframework.http.server.ServerHttpResponse; import org.springframework.web.socket.WebSocketHandler; import org.springframework.web.socket.adapter.StandardEndpointAdapter; import org.springframework.web.socket.adapter.StandardWebSocketSessionAdapter; import org.springframework.web.socket.server.HandshakeFailureException; import org.springframework.web.socket.server.RequestUpgradeStrategy; /** * A {@link RequestUpgradeStrategy} for containers that support standard Java WebSocket. * * @author Rossen Stoyanchev * @since 4.0 */ public abstract class AbstractStandardUpgradeStrategy implements RequestUpgradeStrategy { protected final Log logger = LogFactory.getLog(getClass()); private final ServerWebSocketSessionInitializer wsSessionInitializer = new ServerWebSocketSessionInitializer(); @Override public void upgrade(ServerHttpRequest request, ServerHttpResponse response, String protocol, WebSocketHandler handler) throws IOException, HandshakeFailureException { StandardWebSocketSessionAdapter session = new StandardWebSocketSessionAdapter(); this.wsSessionInitializer.initialize(request, response, session); StandardEndpointAdapter endpoint = new StandardEndpointAdapter(handler, session); upgradeInternal(request, response, protocol, endpoint); } protected abstract void upgradeInternal(ServerHttpRequest request, ServerHttpResponse response, String selectedProtocol, Endpoint endpoint) throws IOException, HandshakeFailureException; }