The rest of the code could be ported without major change as almost all the thread synchronization and signaling primitives are available in Java 1.5 onwards. public class Command <T> { ...

Micronaut Framework 4.0.0 detects virtual thread support, available since Java 19, and uses it for the executor named "BLOCKING" if available.

Thread gates: An overview A good metaphor for thread gates is the traffic light system that operates on many public roads. When the signal is red, cars have to wait at the stop line until the ...