接下来，如果tls模式开启，则进行一些动作：

if (TlsSystemConfig.tlsMode != TlsMode.DISABLED) {

tls模式我们之前看过了，是一种安全传输协议。

看下里面具体干了什么：

try {
    fileWatchService = new FileWatchService(
        new String[] {
            TlsSystemConfig.tlsServerCertPath,
            TlsSystemConfig.tlsServerKeyPath,
            TlsSystemConfig.tlsServerTrustCertPath
        },
        new FileWatchService.Listener() {
            boolean certChanged, keyChanged = false;

            @Override
            public void onChanged(String path) {
                if (path.equals(TlsSystemConfig.tlsServerTrustCertPath)) {
                    log.info("The trust certificate changed, reload the ssl context");
                    reloadServerSslContext();
                }
                if (path.equals(TlsSystemConfig.tlsServerCertPath)) {
                    certChanged = true;
                }
                if (path.equals(TlsSystemConfig.tlsServerKeyPath)) {
                    keyChanged = true;
                }
                if (certChanged && keyChanged) {
                    log.info("The certificate and private key changed, reload the ssl context");
                    certChanged = keyChanged = false;
                    reloadServerSslContext();
                }
            }

            private void reloadServerSslContext() {
                ((NettyRemotingServer) remotingServer).loadSslContext();
                ((NettyRemotingServer) fastRemotingServer).loadSslContext();
            }
        });
} catch (Exception e) {
    log.warn("FileWatchService created error, can't load the certificate dynamically");
}

可以看到是写了一个监听器，对tls相关的三个文件的修改做了监听，这个其实

和namesrv的启动异曲同工

熟悉的reload方法：

private void reloadServerSslContext() {
    ((NettyRemotingServer) remotingServer).loadSslContext();
    ((NettyRemotingServer) fastRemotingServer).loadSslContext();
}

其实就是当配置文件信息改变后

把sslContext里的配置信息重置一次