Another tool that Clojure provides for working with agents is watchers. These are just functions that get a chance to peek at the agent's data. This happens after the validators have successfully run and the new data is set as the agent's state. Because of the way it's handled, the state may have changed again since then, but watchers give you the chance to look at the data and track it separately.
This can help us keep an eye on the data as it's being processed. We can use it to log progress, sample the data for manual validation, or a number of other tasks.
We'll need these dependencies:
(require '[clojure.java.io :as io]
'[clojure.data.csv :as csv]
'[clojure.string :as str])
(import '[java.lang Thread])Also, we'll use the data files from the Managing program complexity with agents recipe, along with the binding to the list of those files, data-files.
From Managing program complexity with STM, we'll use the lazy-read-csv and...