Java may achieve a functionality for sharing immutable knowledge throughout threads, primarily based on a plan now into consideration within the OpenJDK realm.
An OpenJDK proposal for extent-local variables, at present an incubating API, would offer a programming mannequin to share knowledge each inside a thread and with youngster threads. Extent-local variables are most well-liked to thread-local variables, notably when utilizing massive numbers of digital threads, the proposal states.
The proposal lists 4 objectives behind the incubating API:
- Ease of use, to simplify reasoning about knowledge circulation.
- Comprehensibility, to make the lifetime of shared knowledge seen from the syntactic construction of code.
- Robustness, to make sure that knowledge shared by a caller might be retrieved solely by authentic callees.
- Efficiency, to deal with shared knowledge as immutable to permit sharing by a lot of threads and allow runtime optimizations.
The extent local-variables API at present is just not slated for any specific model of normal Java. The earliest it may probably seem could be in Java 20, due in March 2023. Java 19, or Java Development Kit 19, due to arrive on September 20, is closed to new options.
The extent-local variables plan doesn’t contain altering the Java programming language itself. There additionally is not any intent to require migration away from thread-local variables, or to deprecate the present ThreadLocal API.
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