public List<DiscoveryUpstreamData> provide(final String pluginSelectorName) {
        return cache.getOrDefault(pluginSelectorName, new ArrayList<>());
    }
provide.

@param pluginSelectorName pluginSelectorName
@return UpstreamList
shenyu-protocol/shenyu-protocol-tcp/src/main/java/org/apache/shenyu/protocol/tcp/UpstreamProvider.java