Is there an ACK mechanism when sender sent a message to broker?

[Lok Yu <du...@yahoo.com.hk>]

I have a few questions which hope experts help me to answer

1. Is there an ACK mechanism when sender sent a message to broker? 

2. Is it possible that client not ACK the broker and broker will push
content to client again?

Thanks so much for answering.
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Re: Is there an ACK mechanism when sender sent a message to broker?

[Danielius Jurna <da...@elitnet.lt>]

Openwire protocol (used by default by java clients) there is ACK for sent
messages.
For stomp protocol - it is optional and depends on client implementation as
far as I know.

Regarding duplicates, when client does not send ACK to the broker, yes the
broker will send the message again.


Lok Yu wrote:
> 
> I have a few questions which hope experts help me to answer
> 
> 1. Is there an ACK mechanism when sender sent a message to broker? 
> 
> 2. Is it possible that client not ACK the broker and broker will push
> content to client again?
> 
> Thanks so much for answering.
> 

-- 
View this message in context: http://www.nabble.com/Is-there-an-ACK-mechanism-when-sender-sent-a-message-to-broker--tf2923535.html#a8173542
Sent from the ActiveMQ - User mailing list archive at Nabble.com.

Re: Is there an ACK mechanism when sender sent a message to broker?

[James Strachan <ja...@gmail.com>]

On 1/5/07, Lok Yu <du...@yahoo.com.hk> wrote:
>
> I have a few questions which hope experts help me to answer
>
> 1. Is there an ACK mechanism when sender sent a message to broker?

In OpenWire on all commands a client can ask for a receipt of the
operation; so you can receive a receipt when the broker has processed
any send message. This is used for persistent messaging to know how
long to block a client doing a synchronous send.


> 2. Is it possible that client not ACK the broker and broker will push
> content to client again?


A consumer can hog a message and not ACK it, yes. Though as soon as
the client disconnects the message is redelivered. We've talked about
having a timeout on messages so any consumer which doesn't ACK a
message within some time period will be automatically detected and
closed by the broker.

-- 

James
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