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This tutorial builds on the basic concepts introduced in Persistence with Queues tutorial and will show you how to properly process publisher acknowledgements. Once an acknowledgement for a message has been received and processed, you have confirmed your persistent messages have been properly accepted by Solace messaging and therefore can be guaranteed of no message loss.
When sending persistent messages, the Producer will not return from the blocking
send() method until the message is fully acknowledged by the message broker.
This behavior means that applications sending persistent messages using Solace messaging are guaranteed that the messages are accepted by the time the
send() call returns. No extra publisher acknowledgement handling is required or possible.
This behavior also means that persistent message producers are forced to block on sending each message. This can lead to performance bottlenecks on publish.
For Node.js applications there is nothing further they must do to confirm message delivery with Solace messaging. This is handled by the underlying client by making the
send() call blocking.