Package org.apache.pekko.dispatch.sysmsg

Interface SystemMessage

All Superinterfaces:

PossiblyHarmful, Serializable

All Known Implementing Classes:

NoMessage$

public interface SystemMessage
extends PossiblyHarmful, Serializable

System messages are handled specially: they form their own queue within each actor’s mailbox. This queue is encoded in the messages themselves to avoid extra allocations and overhead. The next pointer is a normal var, and it does not need to be volatile because in the enqueuing method its update is immediately succeeded by a volatile write and all reads happen after the volatile read in the dequeuing thread. Afterwards, the obtained list of system messages is handled in a single thread only and not ever passed around, hence no further synchronization is needed.

INTERNAL API

NEVER SEND THE SAME SYSTEM MESSAGE OBJECT TO TWO ACTORS

Method Summary

Modifier and Type	Method	Description
SystemMessage	next()
void	next_$eq(SystemMessage x$1)
void	unlink()
boolean	unlinked()

Method Details

next

SystemMessage next()

next_$eq

void next_$eq(SystemMessage x$1)

unlink

void unlink()

unlinked

boolean unlinked()