Poor man's job runner with Clojure Agents
The article explores creating a job runner in Clojure using Agents for concurrency. It discusses motivation, implementation details, pros (no external libraries, error recovery) and cons (single process dependency, timing bugs).
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This article discusses the creation of a job runner using Clojure Agents, exploring the misuse of Clojure's concurrency features to build an in-memory job runner. The author explains the motivation behind this project, highlighting the desire to utilize features beyond atoms and referencing Rich Hickey's "Ants" demo. By leveraging agents in Clojure, the author demonstrates how to manage background jobs with job control functionalities like run, pause, cancel, and observe job state without blocking execution. The article delves into the implementation details, including the use of validators and agents to ensure sequential execution and out-of-band job control. Pros of this approach include no need for external libraries, straightforward lock-free code, built-in error recovery, and observability of state and errors. However, potential cons involve the risk of in-memory job control being tied to a single process and the possibility of introducing subtle bugs related to timing and order. The author also mentions alternatives like using SQLite for job state management.
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