Clojure Applied: From Practice to Practitioner by Ben Vandgrift & Alex Miller

Author:Ben Vandgrift & Alex Miller [Vandgrift, Ben]
Language: eng
Format: epub
Tags: Pragmatic Bookshelf
ISBN: 9781680500745
Publisher: Pragmatic Bookshelf
Published: 2015-08-26T22:00:00+00:00

(defn go-print

"Pull messages from channel c and print them."

[c]

(go

(loop []

(when-some [val (<! c)]

(println "Received a message:" val)

(recur)))))

In this example, the go block runs as a lightweight process. When it reaches a channel operation (such as <! or >!), if the channel operation can be performed, execution continues. If the channel operation can’t continue, the go block is parked. A parked go block doesn’t consume a thread; it’s effectively a suspended computation waiting for data. When the channel operation can proceed, the go block wakes up for continued execution.

Go blocks are a great tool for breaking up a program into potentially concurrent processes. One use case that core.async supports particularly well with go blocks and channels is building pipelines of data transformation stages.

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