Project Loom: Modern Scalable Concurrency for the Java Platform
summary
Project Loom adds virtual threads to the JDK as lightweight, JVM‑managed threads with dynamically growing stacks scheduled onto a few OS carrier threads, offering microsecond switching and a few hundred bytes of metadata so concurrency scales far beyond traditional platform threads. It provides a thread executor that spawns a virtual thread per task, structured join semantics via AutoCloseable so lifetimes match code, combinators like invokeAny/invokeAll, and known limits (blocking JNI, blocking while holding synchronized) with Jetty tests showing improved scalability.
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chapters (22)
- 0:00Introduction
- 0:53What is concurrency
- 5:18What are threads
- 6:55What are synchronous threads
- 8:11Spread calls
- 10:31Waiting for IO
- 13:01Asynchronous
- 13:29Developers Dilemma
- 13:59Unlimited Threads
- 14:52Rethinking Threads
- 16:02Thread API
- 17:42Platform Thread
- 18:57Virtual Threads
- 20:15Platform Virtual Threads
- 21:02Creating Virtual Threads
- 22:14Downsizing Threads
- 23:28Structured Concurrency
- 24:51Unstructured Structured
- 25:10Thread Executor
- 28:45Invoke Any
- 30:00Questions
- 37:50Collections
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