Cczzzz opened a new pull request #1801: add client custom nameserver TopAddressing URL: https://github.com/apache/rocketmq/pull/1801 I change TopAddressing to interface. ``` public interface TopAddressing { String fetchNSAddr(); void registerChangeCallBack(Consumer<String> changeCallBack); } ``` Uesr can ues ServiceLoader to loading custom TopAddressing implementation. When there is a custom implementation,Custom implementations are preferred. ``` private TopAddressing findCustomTopAddressing() { ServiceLoader<TopAddressing> serviceLoader = ServiceLoader.load(TopAddressing.class); Iterator<TopAddressing> iterator = serviceLoader.iterator(); if (iterator.hasNext()) { return iterator.next(); } return null; } ``` I also provide a way to call back.this is a methods in interface TopAddressing. MQClientAPIImpl will register call back function to perception changes ``` this.topAddressing.registerChangeCallBack(this::fetchNameServerAddr); ```
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