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Notes on non-blocking REST
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completablefuture.txt
https://www.javacodegeeks.com/2015/07/understanding-callable-and-spring-deferredresult.html
suppyAsync() - supply task pool executor as 2nd param
whenAsyncComplete() - set result of promise
thenCompose() - to add new tasks
poolsize: Runtime.getRuntime().availableProcessors() + 1
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