January 2017
Intermediate to advanced
565 pages
13h 46m
English
Content preview from Clojure: High Performance JVM ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Asynchronous agents and state
While atoms are synchronous, agents are the asynchronous mechanism in Clojure to effect any change in the state. Every agent is associated with a mutable state. We pass a function (known as "action") to an agent with the optional additional arguments. This function gets queued for processing in another thread by the agent. All the agents share two common thread pools—one for the low-latency (potentially CPU-bound, cache-bound, or memory-bound) jobs, and one for the blocking (potentially I/O related or lengthy processing) jobs. Clojure provides the send function for the low-latency actions, send-off for blocking actions, and send-via to have the action executed on the user-specified thread-pool, instead of either of ...
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