StructuredTaskScope And ScopedValue - Get The Most Out of Virtual Threads
summary
Live-codes a small Spring Boot app that uses Java 21 virtual threads plus the preview features StructuredTaskScope and ScopedValue to turn three 500 ms blocking info calls (Google, LinkedIn, Facebook — Facebook throws) plus a 1 s talk call into a concurrent, robust flow. Builds a custom StructuredTaskScope with custom Joiner that picks the best result, swaps mutable ThreadLocal for ScopedValue replaces ThreadLocal, and shows with JMeter (≈1,000 concurrent requests) that end-to-end latency drops to 1 second end-to-end while handling failures and exceptions gracefully.
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chapters (8)
- 0:00Virtual threads intro
- 1:07Virtual threads performance
- 7:53Virtual threads limits
- 12:13StructuredTaskScope
- 16:46Custom joiner
- 23:51StructuredTaskScope features
- 24:53ScopedValues vs ThreadLocal
- 32:36Recap & Q&A
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