How to organize the storage of an object with a timer on a server without a DBMS?

Question

.NET

Good afternoon, the task is as follows: there is a certain object with a countdown timer, a functionality similar to a chat where there is a message (our object) with a timer. That is, the user (client) sends a new object through the server to all active clients and the countdown begins. Everything would be fine and the timer could work for the client.
What to do with newly connected clients or reconnect.
How to organize the storage of such objects on the server with a timer and give the client an object and the remaining time on a new session

Answer 1

I don't know exactly how your system is implemented, but if without a DBMS, then the first thing that comes to mind is to store in the memory of the server process the date and time the "object" was received by the server. Naturally, the timer will be lost when the server is restarted.