Multithreading vs Asynchronous Programming: The Architectural Shift
summary
Compares Java threading evolution with concrete failures and fixes: a two-thread pool example shows a pool-induced deadlock when parent tasks spawn children; ForkJoinPool and Streams (Java 8) change structure but IO plus exceptions make CompletableFuture painful — the presenter calls it completable future has no future. Demonstrates code switching Thread.start to virtual threads (Java 21), observes threads unmounting/mounting during IO and shows virtual threads let 20,000 concurrent tasks run on one machine instead of a cluster.
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chapters (14)
- 0:00Introduction to the talk
- 1:26Sequential vs concurrent code
- 3:54The pain of multithreading
- 8:53Evolution of Java threading
- 11:01Parallel vs concurrent tasks
- 14:18What is asynchronous programming
- 21:05Thread blocking and scalability
- 26:51Java 8 streams and parallelism
- 32:09CompletableFuture basics
- 36:31Challenges with CompletableFuture
- 45:59CompletableFuture pain points
- 47:25Virtual threads in Java 21
- 51:19Demo of virtual threads
- 59:57Summary of architectural shift
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