spring AbstractSubProtocolEvent 源码
spring AbstractSubProtocolEvent 代码
文件路径：/spring-websocket/src/main/java/org/springframework/web/socket/messaging/AbstractSubProtocolEvent.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 java.security.Principal;
import org.springframework.context.ApplicationEvent;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
import org.springframework.util.Assert;
/**
* A base class for events for a message received from a WebSocket client and
* parsed into a higher-level sub-protocol (e.g. STOMP).
*
* @author Rossen Stoyanchev
* @since 4.1
*/
@SuppressWarnings("serial")
public abstract class AbstractSubProtocolEvent extends ApplicationEvent {
private final Message<byte[]> message;
@Nullable
private final Principal user;
/**
* Create a new AbstractSubProtocolEvent.
* @param source the component that published the event (never {@code null})
* @param message the incoming message (never {@code null})
*/
protected AbstractSubProtocolEvent(Object source, Message<byte[]> message) {
this(source, message, null);
}
/**
* Create a new AbstractSubProtocolEvent.
* @param source the component that published the event (never {@code null})
* @param message the incoming message (never {@code null})
*/
protected AbstractSubProtocolEvent(Object source, Message<byte[]> message, @Nullable Principal user) {
super(source);
Assert.notNull(message, "Message must not be null");
this.message = message;
this.user = user;
}
/**
* Return the Message associated with the event. Here is an example of
* obtaining information about the session id or any headers in the
* message:
* <pre class="code">
* StompHeaderAccessor headers = StompHeaderAccessor.wrap(message);
* headers.getSessionId();
* headers.getSessionAttributes();
* headers.getPrincipal();
* </pre>
*/
public Message<byte[]> getMessage() {
return this.message;
}
/**
* Return the user for the session associated with the event.
*/
@Nullable
public Principal getUser() {
return this.user;
}
@Override
public String toString() {
return getClass().getSimpleName() + "[" + this.message + "]";
}
}
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