spring ExceptionWebSocketHandlerDecorator 源码
spring ExceptionWebSocketHandlerDecorator 代码
文件路径：/spring-websocket/src/main/java/org/springframework/web/socket/handler/ExceptionWebSocketHandlerDecorator.java
/*
* Copyright 2002-2019 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
*
* https://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.handler;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketMessage;
import org.springframework.web.socket.WebSocketSession;
/**
* An exception handling {@link WebSocketHandlerDecorator}.
* Traps all {@link Throwable} instances that escape from the decorated
* handler and closes the session with {@link CloseStatus#SERVER_ERROR}.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public class ExceptionWebSocketHandlerDecorator extends WebSocketHandlerDecorator {
private static final Log logger = LogFactory.getLog(ExceptionWebSocketHandlerDecorator.class);
public ExceptionWebSocketHandlerDecorator(WebSocketHandler delegate) {
super(delegate);
}
@Override
public void afterConnectionEstablished(WebSocketSession session) {
try {
getDelegate().afterConnectionEstablished(session);
}
catch (Exception ex) {
tryCloseWithError(session, ex, logger);
}
}
@Override
public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) {
try {
getDelegate().handleMessage(session, message);
}
catch (Exception ex) {
tryCloseWithError(session, ex, logger);
}
}
@Override
public void handleTransportError(WebSocketSession session, Throwable exception) {
try {
getDelegate().handleTransportError(session, exception);
}
catch (Exception ex) {
tryCloseWithError(session, ex, logger);
}
}
@Override
public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) {
try {
getDelegate().afterConnectionClosed(session, closeStatus);
}
catch (Exception ex) {
if (logger.isWarnEnabled()) {
logger.warn("Unhandled exception after connection closed for " + this, ex);
}
}
}
public static void tryCloseWithError(WebSocketSession session, Throwable exception, Log logger) {
if (logger.isErrorEnabled()) {
logger.error("Closing session due to exception for " + session, exception);
}
if (session.isOpen()) {
try {
session.close(CloseStatus.SERVER_ERROR);
}
catch (Throwable ex) {
// ignore
}
}
}
}
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