On 03/11/19 19:53, Euler Taveira wrote: > Em seg, 11 de mar de 2019 às 10:36, Andy Fan > <zhihui.fan1...@gmail.com> escreveu: >> >> I need some function which requires some message exchange among different >> back-ends （connections). >> specially I need a shared hash map and a message queue. >> > It seems you are looking for LISTEN/NOTIFY. However, if it is part of
My own recollection from looking at LISTEN/NOTIFY is that, yes, it offers a mechanism for message passing among sessions, but the message /reception/ part is very closely bound to the frontend/backend protocol. That is, a message sent in session B can be received in session A, but it pretty much goes flying straight out the network connection to /the connected client associated with session A/. If you're actually working /in the backend/ of session A (say, in a server-side PL), it seemed to be unexpectedly difficult to find a way to hook those notifications. But I looked at it only briefly, and some time ago. Regards, -Chap
