<br><div> I try to implement this logic in application level, but it fails.<br>
<div><br>
There is a sender and a receiver in my cases. <br>
1.
Sender will publish a event (A) to spread and subscribe the
corresponding ACK event (AC). If it can not receive the ACK event (AC)
in a short period of time (10 secs) it will resend the event (A) and
wait for the ACK event (AC) again until it receive the ACK event (AC)
successfully.<br>
2. The receiver will send out the ACK event (AC) after receiving the event (A). <br>
<br>
It
works in first case: The sender can receive ACK event (A) immediately
if receiver is alive when sender sends out the event (A) in the first
time.<br>
<br>
It fails in second case: The receiver is down when the
sender sends out the event (A) in the first time. When the sender is
blocked in receive(), I manually start the receiver. 10 sends later,
the sender tries to send out the event (A) for the second time. Now the
receiver is alive and it can receive the the event (A) and send out the
ACK event. But, the sender still can not receiver the ACK event (AC).
The same thing happens for next tries. It stills fails even when
sender disconnects and connects each time before it sends the event (A)
to receiver.<br>
<br>
Is it a bug or do I miss something?<br>
<br>
Thanks in advance!</div></div><div> </div><div style="padding: 2px 0pt; font-size: 12px; font-family: Arial Narrow;">------------------ 原始邮件 ------------------</div><div style="font-size: 12px;"><div id="menu_sender"><b>发件人:</b> "Alexey Zakhlestin"<indeyets@gmail.com>;</div><div><b>发送时间:</b> 2008年10月23日(星期四) 凌晨0:28</div><div><b>收件人:</b> "lzhshen"<29585543@qq.com>; </div><div><b>抄送:</b> "spread-users"<spread-users@lists.spread.org>; </div><div><b>主题:</b> Re: [Spread-users] how does Spread make sure that the event is successfully delivered to the subscriber?</div></div><div> </div>
<div style="font-weight: normal;">
On Wed, Oct 22, 2008 at 12:58 PM, lzhshen <29585543@qq.com> wrote:<br>> When the event publisher sends the event to Spread and the subscriber<br>> lose the connection with Spread, will this event be lost forever? Will<br>> Spread sends the same event to the subscriber when it connects to Spread<br>> again?<br><br>it won't.<br>this kind of logic is supposed to be implemented on application-level.<br><br>think of spreas as of "UDP". if you need to verify delievery, you have<br>to implement "TCP" on top of it<br><br>-- <br>Alexey Zakhlestin<br>http://blog.milkfarmsoft.com/</div>