BadUncleX

clojure atom实现缓存

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promise vs future

reference: stackeroverflow

promise

1. You create a promise. That promise object can now be passed to any thread.
2. You continue with calculations. These can be very complicated calculations involving side-effects, downloading data, user input, database access, other promises – whatever you like. The code will look very much like your mainline code in any program.
3. When you’re finished, you can deliver the results to that promise object.
4. Any item that tries to deref your promise before you’re finished with your calculation will block until you’re done. Once you’re done and you’ve delivered the promise, the promise won’t block any longer.

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A Delay ensures that some code is either run zero or one time. It's run zero times if the Delay is never derefed.

Delays are also useful for a shared resource between threads.

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CountDownLatch 同步计数器

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future 用法

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pcall 并发执行多个无参方法

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rss中的关键词统计

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好消息， 死锁是确定性的.

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Executor线程池多次执行方法: 测试atom计数器

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deps.edn sample usage