spring SimpSessionScope 源码
spring SimpSessionScope 代码
文件路径：/spring-messaging/src/main/java/org/springframework/messaging/simp/SimpSessionScope.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.messaging.simp;
import org.springframework.beans.factory.ObjectFactory;
import org.springframework.beans.factory.config.Scope;
import org.springframework.lang.Nullable;
/**
* A {@link Scope} implementation exposing the attributes of a SiMP session
* (e.g. WebSocket session).
*
* <p>Relies on a thread-bound {@link SimpAttributes} instance exported by
* {@link org.springframework.messaging.simp.annotation.support.SimpAnnotationMethodMessageHandler}.
*
* @author Rossen Stoyanchev
* @since 4.1
*/
public class SimpSessionScope implements Scope {
@Override
public Object get(String name, ObjectFactory<?> objectFactory) {
SimpAttributes simpAttributes = SimpAttributesContextHolder.currentAttributes();
Object scopedObject = simpAttributes.getAttribute(name);
if (scopedObject != null) {
return scopedObject;
}
synchronized (simpAttributes.getSessionMutex()) {
scopedObject = simpAttributes.getAttribute(name);
if (scopedObject == null) {
scopedObject = objectFactory.getObject();
simpAttributes.setAttribute(name, scopedObject);
}
return scopedObject;
}
}
@Override
@Nullable
public Object remove(String name) {
SimpAttributes simpAttributes = SimpAttributesContextHolder.currentAttributes();
synchronized (simpAttributes.getSessionMutex()) {
Object value = simpAttributes.getAttribute(name);
if (value != null) {
simpAttributes.removeAttribute(name);
return value;
}
else {
return null;
}
}
}
@Override
public void registerDestructionCallback(String name, Runnable callback) {
SimpAttributesContextHolder.currentAttributes().registerDestructionCallback(name, callback);
}
@Override
@Nullable
public Object resolveContextualObject(String key) {
return null;
}
@Override
public String getConversationId() {
return SimpAttributesContextHolder.currentAttributes().getSessionId();
}
}
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