如何检测停止在Firebase中监听的客户端? [英] How to detect a client that stops listening in firebase?

问题描述

比方说，我有3个客户端正在监听某个Firebase根上的更改.每个客户端将自己表示为用户(在根目录中的列表(或映射)中).我想删除失去连接或关闭其客户端应用程序(即停止监听)的用户.如何检测何时发生并处理更改?

Let's say I have 3 clients that are listening for changes on some firebase root. Each client represents themselves as a user in a List (or Map) on the root. I want to remove a user that loses their connection or closes their client app (i.e. stops listening). How can I detect when this happens and handle the change?

推荐答案

超级简单.查看onDisconnect().当用户断开连接甚至更新节点中的值时，它可以将数据写出到节点.例如，在断开连接时，将用户状态(可能存储在用户节点中)更改为status:disconnected.

Super easy. Check out onDisconnect(). It can write data out to a node when the user disconnects or even update the value in a node. For example, on disconnect change the user status (maybe stored in your users node) to status:disconnected.

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