Websphere MQ主題 - 它們是嚴格命令的嗎？

Question

在您訂閱strictly ordered的Websphere MQ topic上收到消息嗎？

換句話說，以類似於queue的方式，假設您的連接得到維護，您可以保證以與發送相同的順序收到topic消息嗎？

Answer 1

按照JMS規範

JMS defines that messages sent by a session to a destination must be received 
in the order in which they were sent. This defines a partial ordering 
constraint on a session’s input message stream. 

JMS does not define order of message receipt across destinations or across 
a destination’s messages sent from multiple sessions. This aspect of a 
session’s input message stream order is timing-dependent. It is not under  
application control. 

而且

Although clients loosely view the messages they produce within a session 
as forming a serial stream of sent messages, the total ordering of this stream 
is not significant. The only ordering that is visible to receiving clients is 
the order of messages a session sends to a particular destination. 
Several things can affect this order like message priority, 
persistent/non persistent etc. 

因此，要回答你的問題是not really JMS provider specific收到什麼樣的順序消息。他們將以與上述信息相同的順序收到。然而，消息傳遞到服務器的順序受限於消息優先級，持久性/非持久性等限制。