Because wait() first releases the monitor, the calling thread must own the lock; the JVM enforces this with an IllegalMonitorStateException, and the synchronized block prevents the lost‑wake‑up race by atomically checking conditions and releasing the lock before waiting.
This article explains the concepts, usage conditions, execution flow, internal mechanisms, and best‑practice guidelines for Java's wait() and notify() methods, illustrated with a producer‑consumer example and code snippets for safe thread coordination.
This guide walks through verifying MySQL 8.0.16+, copying and editing the mysqld.service file, setting the Service Type to notify, adding NotifyAccess, adjusting ExecStart, reloading systemd, restarting MySQL, and checking its status, while covering SELinux, firewall, and notification‑delay optimizations.
The article explains how Alibaba's Notify and MetaQ middleware achieve high‑performance, reliable distributed messaging and final consistency for massive e‑commerce transactions, detailing their architecture, design principles, scalability, fault‑tolerance, and the specific optimizations applied for the Double‑11 shopping festival.
