@Spi(scope=SINGLETON) public interface Protocol
只负责点到点的通讯
<T> Exporter<T> export(Provider<T> provider, URL url)
T - provider - url - <T> Referer<T> refer(Class<T> clz, URL url, URL serviceUrl)
T - clz - url - serviceUrl - void destroy()
1) exporter destroy
2) referer destroy
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