Question

In a publish-subscribe model, how does the system ensure that a subscriber receives missed messages that were sent while the subscriber was briefly offline?

Accepted Answer

In a publish-subscribe model, the system uses a queue to hold onto messages while a subscriber is offline. A queue is like a waiting line at a store where messages stand in order until someone comes to pick them up. The central server, which is the computer that manages the flow of messages, acts as a temporary storage space. When a subscriber is away, the server puts incoming messages into a buffer, which is a dedicated memory space for storing information that has not been read yet. As soon as the subscriber reconnects and tells the server they are back, the server sends all the stored messages from the buffer. Some systems use a persistent log, which is a digital record that writes messages to a hard drive so they are never lost even if the server restarts. This ensures the subscriber gets every piece of information they missed in the exact order it was sent.

In a publish-subscribe model, how does the system ensure that a subscriber receives missed messages that were sent while the subscriber was briefly offline?

In a publish-subscribe model, the system uses a queue to hold onto messages while a subscriber is offline. A queue is like a waiting line at a store where messages stand in order until someone comes to pick them up. The central server, which is the computer that....

Community Answers

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In a publish-subscribe model, how does the system ensure that a subscriber receives missed messages that were sent while the subscriber was briefly offline?

In a publish-subscribe model, the system uses a queue to hold onto messages while a subscriber is offline. A queue is like a waiting line at a store where messages stand in order until someone comes to pick them up. The central server, which is the computer that....

Community Answers