DongyuanPan commented on code in PR #238:
URL: https://github.com/apache/rocketmq-mqtt/pull/238#discussion_r1496811401


##########
mqtt-cs/src/main/java/org/apache/rocketmq/mqtt/cs/protocol/ssl/SslFactory.java:
##########
@@ -71,6 +76,55 @@ private void initSslContext() {
         }
     }
 
+    @PostConstruct
+    private void onSslCertChanged() {
+        if (!connectConf.isEnableTlsSever()) {
+            return;
+        }
+
+        String[] watchFiles = {connectConf.getSslServerCertFile(), 
connectConf.getSslServerKeyFile(),
+                connectConf.getSslCaCertFile()};
+
+        FileWatchService.Listener listener = new FileWatchService.Listener() {
+
+            boolean certChanged, keyChanged = false;
+
+            @Override
+            public void onChanged(String path) {
+                if (path.equals(connectConf.getSslCaCertFile())) {
+                    LOG.info("The trust certificate changed, reload the ssl 
context");
+                    initSslContext();
+                }
+                if (path.equals(connectConf.getSslServerCertFile())) {
+                    certChanged = true;
+                }
+                if (path.equals(connectConf.getSslServerKeyFile())) {
+                    keyChanged = true;
+                }
+                if (certChanged && keyChanged) {
+                    LOG.info("The certificate and private key changed, reload 
the ssl context");
+                    certChanged = false;
+                    keyChanged = false;
+                    initSslContext();
+                }
+            }
+        };
+
+        try {
+            fileWatchService = new FileWatchService(watchFiles, listener);
+            fileWatchService.start();
+        } catch (Exception e) {
+            LOG.warn("FileWatchService created error, can't load the 
certificate dynamically");
+        }
+    }
+
+    @PreDestroy
+    private void destroy() {
+        if (this.fileWatchService != null) {
+            this.fileWatchService.shutdown();
+        }
+    }
+
     public SSLEngine buildSslEngine(SocketChannel ch) {

Review Comment:
   sslContext has been reloaded, SSLEngine should also be reloaded. If you want 
the reloaded certificate to take effect, do you need to restart the port 
listening in MqttServer#startTls?



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