spring StompSubProtocolErrorHandler 源码
spring StompSubProtocolErrorHandler 代码
文件路径：/spring-websocket/src/main/java/org/springframework/web/socket/messaging/StompSubProtocolErrorHandler.java
/*
* Copyright 2002-2017 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.messaging;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
import org.springframework.messaging.simp.stomp.StompCommand;
import org.springframework.messaging.simp.stomp.StompHeaderAccessor;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.messaging.support.MessageHeaderAccessor;
import org.springframework.util.Assert;
/**
* A {@link SubProtocolErrorHandler} for use with STOMP.
*
* @author Rossen Stoyanchev
* @since 4.2
*/
public class StompSubProtocolErrorHandler implements SubProtocolErrorHandler<byte[]> {
private static final byte[] EMPTY_PAYLOAD = new byte[0];
@Override
@Nullable
public Message<byte[]> handleClientMessageProcessingError(@Nullable Message<byte[]> clientMessage, Throwable ex) {
StompHeaderAccessor accessor = StompHeaderAccessor.create(StompCommand.ERROR);
accessor.setMessage(ex.getMessage());
accessor.setLeaveMutable(true);
StompHeaderAccessor clientHeaderAccessor = null;
if (clientMessage != null) {
clientHeaderAccessor = MessageHeaderAccessor.getAccessor(clientMessage, StompHeaderAccessor.class);
if (clientHeaderAccessor != null) {
String receiptId = clientHeaderAccessor.getReceipt();
if (receiptId != null) {
accessor.setReceiptId(receiptId);
}
}
}
return handleInternal(accessor, EMPTY_PAYLOAD, ex, clientHeaderAccessor);
}
@Override
@Nullable
public Message<byte[]> handleErrorMessageToClient(Message<byte[]> errorMessage) {
StompHeaderAccessor accessor = MessageHeaderAccessor.getAccessor(errorMessage, StompHeaderAccessor.class);
Assert.notNull(accessor, "No StompHeaderAccessor");
if (!accessor.isMutable()) {
accessor = StompHeaderAccessor.wrap(errorMessage);
}
return handleInternal(accessor, errorMessage.getPayload(), null, null);
}
protected Message<byte[]> handleInternal(StompHeaderAccessor errorHeaderAccessor, byte[] errorPayload,
@Nullable Throwable cause, @Nullable StompHeaderAccessor clientHeaderAccessor) {
return MessageBuilder.createMessage(errorPayload, errorHeaderAccessor.getMessageHeaders());
}
}
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