StructuredTaskScope And ScopedValue - Get The Most Out of Virtual Threads
summary
Live-coding builds a Spring Boot demo that swaps blocking REST calls for virtual threads plus StructuredTaskScope and ScopedValue (both in third preview), showing how to fork/join virtual-thread subtasks, extend StructuredTaskScope for aggregation, and replace ThreadLocal with ScopedValue so child scopes see values. Under JMeter with 1,000 concurrent users the demo drops median latency from about 2.5 seconds to 1 second by parallelizing IO; ThreadLocal becomes null inside child virtual threads while ScopedValue retains the header.
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chapters (13)
- 0:00Introduction
- 1:26Virtual threads overview
- 6:20Fixing performance
- 10:52StructuredTaskScope intro
- 16:36Replacing reactive code
- 21:37Cleaner code with StructuredTaskScope
- 24:46Concurrent tasks
- 27:57Benchmarking performance
- 29:00Key benefits
- 30:26ScopedValues vs ThreadLocals
- 36:04When to use ScopedValues
- 39:14Recap
- 39:56Q&A
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