spring SimpAttributesContextHolder 源码
spring SimpAttributesContextHolder 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/simp/SimpAttributesContextHolder.java
/*
* Copyright 2002-2018 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.messaging.simp;
import org.springframework.core.NamedThreadLocal;
import org.springframework.lang.Nullable;
import org.springframework.messaging.Message;
/**
* Holder class to expose SiMP attributes associated with a session (e.g. WebSocket)
* in the form of a thread-bound {@link SimpAttributes} object.
*
* @author Rossen Stoyanchev
* @since 4.1
*/
public abstract class SimpAttributesContextHolder {
private static final ThreadLocal<SimpAttributes> attributesHolder =
new NamedThreadLocal<>("SiMP session attributes");
/**
* Reset the SimpAttributes for the current thread.
*/
public static void resetAttributes() {
attributesHolder.remove();
}
/**
* Bind the given SimpAttributes to the current thread.
* @param attributes the RequestAttributes to expose
*/
public static void setAttributes(@Nullable SimpAttributes attributes) {
if (attributes != null) {
attributesHolder.set(attributes);
}
else {
resetAttributes();
}
}
/**
* Extract the SiMP session attributes from the given message, wrap them in
* a {@link SimpAttributes} instance and bind it to the current thread.
* @param message the message to extract session attributes from
*/
public static void setAttributesFromMessage(Message<?> message) {
setAttributes(SimpAttributes.fromMessage(message));
}
/**
* Return the SimpAttributes currently bound to the thread.
* @return the attributes or {@code null} if not bound
*/
@Nullable
public static SimpAttributes getAttributes() {
return attributesHolder.get();
}
/**
* Return the SimpAttributes currently bound to the thread or raise an
* {@link java.lang.IllegalStateException} if none are bound.
* @return the attributes, never {@code null}
* @throws java.lang.IllegalStateException if attributes are not bound
*/
public static SimpAttributes currentAttributes() throws IllegalStateException {
SimpAttributes attributes = getAttributes();
if (attributes == null) {
throw new IllegalStateException("No thread-bound SimpAttributes found. " +
"Your code is probably not processing a client message and executing in " +
"message-handling methods invoked by the SimpAnnotationMethodMessageHandler?");
}
return attributes;
}
}
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