Async_Notify

Hi

pá 13. 12. 2019 v 10:00 odesílatel Арсен Арутюнян <arutar@bk.ru> napsal:

Hello! I wrote my extension for PG and am trying to run Async_Notify from
it. But messages come very late! Sometimes only after I execute the notify
command from the shell. What am I doing wrong? How to use Async_Notify
correctly.

I am not sure what mechanism do you use.

Notify messages are send after successful end of transaction.

Regards

Pavel

I'm trying to send a notification from the PG extension directly.
It turns out the mechanism that is used in the async file. (Async_Notify) does not suit me since the function uses oldcontext = MemoryContextSwitchTo (CurTransactionContext); and MemoryContextSwitchTo (oldcontext);
And I did not find the ability to add notification except the Async_Notify function.
 
Now only SPI_execute works ("NOTIFY chanel,’message’", false, 0);
 
P.S. In my extension, there is already a higher function started with oldcontext = MemoryContextSwitchTo (CurTransactionContext); and MemoryContextSwitchTo (oldcontext);
 
   

Пятница, 13 декабря 2019, 12:19 +03:00 от Pavel Stehule <pavel.stehule@gmail.com>:
 
Hi  
pá 13. 12. 2019 v 10:00 odesílatel Арсен Арутюнян < arutar@bk.ru > napsal:

Hello! I wrote my extension for PG and am trying to run Async_Notify from it. But messages come very late! Sometimes only after I execute the notify command from the shell. What am I doing wrong? How to use Async_Notify correctly.
 

 
I am not sure what mechanism do you use.
 
Notify messages are send after successful  end of transaction.
 
Regards
 
Pavel
 

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Арсен Арутюнян

 
 
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Арсен Арутюнян
 

pá 13. 12. 2019 v 12:30 odesílatel Арсен Арутюнян <arutar@bk.ru> napsal:

I'm trying to send a notification from the PG extension directly.
It turns out the mechanism that is used in the async file. (Async_Notify)
does not suit me since the function uses oldcontext = MemoryContextSwitchTo
(CurTransactionContext); and MemoryContextSwitchTo (oldcontext);
And I did not find the ability to add notification except the Async_Notify
function.

Now only SPI_execute works ("NOTIFY chanel,’message’", false, 0);

P.S. In my extension, there is already a higher function started with
oldcontext = MemoryContextSwitchTo (CurTransactionContext); and
MemoryContextSwitchTo (oldcontext);

NOTIFY just push message to queue and waiting on end of transaction.

This is by design and you cannot to change it.

Regards

Pavel