Java 20 Scoped Values смотреть онлайн

Java 20 - Scoped Values with Real Live Code Examples and Explanations.
?? GH Link: https://github.com/engineersunit/java-twenty/blob/main/src/main/java/org/sun/ghosh/MyFavoriteJavaSites.java
Sunit Ghosh

Will using Java 20 - Scoped Values instead of Thread-Local variables make multi threaded coding
✅ Clear
✅ Simple
✅ Robust
✅ Performant

? Lets find out!


? Use Case

✅ Bounded lifetime of the shared data
✅ Immutable shared data between parent-child hierarchy
✅ To have variables having multiple incarnations, one per thread
✅ Large and complex java multi threaded applications need to share data between components
✅ A better way to share data between components than wiring it into a cascade of untrusted method invocations


? ThreadLocal

✅ Thread-local variables
✅ Typically private static fields in classes
✅ Each thread that accesses it has its own, independently initialized copy of the variable
✅ Each thread, as long as alive, holds an implicit reference to its copy of a thread-local variable


? ThreadLocal Issues

⛔ Unconstrained mutability
⛔ Every thread-local variable is mutable
⛔ Unbounded lifetime
⛔ Developers often forget to remove the value
⛔ Expensive inheritance
⛔ Child thread has to allocate storage for every inherited thread-local variable as they are mutable


? ScopedValue

? Allows for safely and efficiently sharing data for a bounded period of execution
? Without passing the data as method arguments
? A value that is set once and is then available for reading for a bounded period of execution by a thread
? Like a thread-local variable, a scoped value has multiple incarnations, one per thread

Sunit Ghosh
#java20 #jdk20 #ScopedValue #github #ThreadLocal