worker-pools

ワーカープールの実装例。

sequenceDiagram
    autonumber
    participant main as func main()
    participant jobs as jobs[chan Job]
    participant workers as func worker()
    participant results as results[chan string]
    
    loop Num of workers
        main ->> workers: Start a worker goroutine
    end

    loop Num of jobs
        main ->> jobs: Send a job[jobs chan<-]
        Note left of workers: Concurrent
        jobs ->> workers: Receive a job[jobs <-chan]
        workers ->> workers: HTTP request
        workers ->> results: Send a response[results chan<-]
    end

go run sandbox/worker-pools/main.go
200: map[ISBN:9780134190440:map[bib_key:ISBN:9780134190440 info_url:https://openlibrary.org/books/OL25925901M/The_Go_Programming_Language preview:noview preview_url:https://openlibrary.org/books/OL25925901M/The_Go_Programming_Language thumbnail_url:https://covers.openlibrary.org/b/id/7427319-S.jpg]]
200: map[ISBN:978-1491941195:map[bib_key:ISBN:978-1491941195 info_url:https://openlibrary.org/books/OL26834447M/Concurrency_in_Go_Tools_and_Techniques_for_Developers preview:noview preview_url:https://openlibrary.org/books/OL26834447M/Concurrency_in_Go_Tools_and_Techniques_for_Developers thumbnail_url:https://covers.openlibrary.org/b/id/8510272-S.jpg]]
200: map[ISBN:0134494164:map[bib_key:ISBN:0134494164 info_url:https://openlibrary.org/books/OL31838215M/Clean_Architecture preview:noview preview_url:https://openlibrary.org/books/OL31838215M/Clean_Architecture]]