Re: LISTEN / NOTIFY

As others have said, a queue system and message system are not exactly the
same.   Can you explain your goal, as the listen/notify may not be
appropriate for your use.  If what you want is really just a message
system, then the example we based our code on is at
https://jdbc.postgresql.org/documentation/81/listennotify.html.

Keep in mind, if you connect (or reconnect) to the listen interface, you
won't get any messages sent before it, so it isn't exactly what you want if
you need a persistent queue, say for a job queue.  We use it for
invalidating cache content.

On Mon, Oct 11, 2021 at 11:31 AM aditya desai <admad123@gmail.com> wrote:

> Hi Erik,
> Thanks for response. We will be implementing it in Java or .NET. Could you
> please send steps for Java?
>
> I am not a Java expert and I am completely DB person. So do we need
> external API to enqueue and dqueue messages. Completely new to this
> concept. Please bear with me :)
>
> Regards,
> Aditya.
>
> On Monday, October 11, 2021, Erik Brandsberg <erik@heimdalldata.com>
> wrote:
>
>> You will need to provide more info, such as what language and driver you
>> are trying to implement this with.  I have implemented it with Java, but
>> the driver has a specific API to implement this.
>>
>> On Mon, Oct 11, 2021 at 10:12 AM aditya desai <admad123@gmail.com> wrote:
>>
>>> Hi,
>>> Has anyone implemented LISTEN / NOTIFY to enqueue and dequeue messages
>>> to and from Postgres? Do you have steps to implement it?
>>>
>>> Regards.
>>> Aditya.
>>>
>>
>>
>> --
>> *Erik Brandsberg*
>> erik@heimdalldata.com
>>
>> www.heimdalldata.com
>> +1 (866) 433-2824 x 700
>> [image: AWS Competency Program]
>> <https://aws.amazon.com/partners/find/partnerdetails/?n=Heimdall%20Data&id=001E000001d9pndIAA>
>>
>

-- 
*Erik Brandsberg*
erik@heimdalldata.com

www.heimdalldata.com
+1 (866) 433-2824 x 700
[image: AWS Competency Program]
<https://aws.amazon.com/partners/find/partnerdetails/?n=Heimdall%20Data&id=001E000001d9pndIAA>