ReferenceBean.getCallProxy()在dubbo3.1.5版本与3.0.4版本的不同？？ #12623
Description
private Object getCallProxy() throws Exception {
if (referenceConfig == null) {
throw new IllegalStateException("ReferenceBean is not ready yet, please make sure to call reference interface method after dubbo is started.");
}
//get reference proxy
//Subclasses should synchronize on the given Object if they perform any sort of extended singleton creation phase.
// In particular, subclasses should not have their own mutexes involved in singleton creation, to avoid the potential for deadlocks in lazy-init situations.
//The redundant type cast is to be compatible with earlier than spring-4.2
synchronized (((DefaultSingletonBeanRegistry)getBeanFactory()).getSingletonMutex()) {
return referenceConfig.get();
}
}
在dubbo3.1.5中为啥要加 synchronized ？？？目的是什么，主要解决什么问题