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go-cqhttp在反向ws连接丢失后,默认情况下在这期间bot接收到的消息会在cqhttp的队列中
当Shiro启动连接上cqhttp后,cqhttp会同时将队列的消息推送到Shiro,这里使用HashMap的话就会报ConcurrentModificationException
Pattern pattern = cache.computeIfAbsent(regex, Pattern::compile);