April 2020
Intermediate to advanced
292 pages
6h 50m
English
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Chapter 5Subscribing to the Message Store
I heard a story while taking a French class once about a royal advisor talking to the king about the development of the printing press.
“I have some good news and some bad news, your majesty,” the advisor said.
“The good news first,” the king replied.
“Books are everywhere.”
“The bad news, then?”
“No one knows how to read, Sire,” the advisor lamented.
You have enough Message Store code to write state as append-only streams of immutable events. We don’t yet have any way get the messages back out. The books are there, but no one is continuously reading them.
That’s what you’re going to fix in this chapter, building the mechanism that components will use to subscribe to the Message Store. Hopefully polling ...
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