db 自动清除过期历史消息数据

broker/src/main/java/io/moquette/BrokerConstants.java

@@ -117,6 +117,7 @@ public final class BrokerConstants {
     public static final String TOKEN_EXPIRE_TIME = "token.expire_time";
 
     public static final String EMBED_DB_PROPERTY_NAME = "embed.db";
+    public static final String DB_AUTO_CLEAN_HISTORY_MESSAGES = "db.auto_clean_history_messages";
 
     public static final String SENSITIVE_Filter_Type = "sensitive.filter.type";
 

broker/src/main/java/io/moquette/server/Server.java

@@ -436,6 +436,7 @@ public class Server {
         System.out.println("Server will flush data to db before shutting down, please wait 5 seconds!");
         LOG.info("Unbinding server from the configured ports");
         m_shutdowning = true;
+        DBUtil.SystemExiting = true;
 
         m_acceptor.close();
         LOG.trace("Stopping MQTT protocol processor");