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Replace the pg_listener-based LISTEN/NOTIFY mechanism with an in-memory queue.

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In addition, add support for a "payload" string to be passed along with
each notify event.

This implementation should be significantly more efficient than the old one,
and is also more compatible with Hot Standby usage.  There is not yet any
facility for HS slaves to receive notifications generated on the master,
although such a thing is possible in future.

Joachim Wieland, reviewed by Jeff Davis; also hacked on by me.
This commit is contained in:
Tom Lane
2010-02-16 22:34:57 +00:00
parent fc5173ad51
commit d1e027221d
37 changed files with 1831 additions and 744 deletions
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12
src/backend/tcop/utility.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.332 2010/02/14 18:42:15 rhaas Exp $
* $PostgreSQL: pgsql/src/backend/tcop/utility.c,v 1.333 2010/02/16 22:34:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -926,17 +926,17 @@ standard_ProcessUtility(Node *parsetree,
case T_NotifyStmt:
{
NotifyStmt *stmt = (NotifyStmt *) parsetree;
PreventCommandDuringRecovery();
Async_Notify(stmt->conditionname);
PreventCommandDuringRecovery();
Async_Notify(stmt->conditionname, stmt->payload);
}
break;
case T_ListenStmt:
{
ListenStmt *stmt = (ListenStmt *) parsetree;
PreventCommandDuringRecovery();
PreventCommandDuringRecovery();
CheckRestrictedOperation("LISTEN");
Async_Listen(stmt->conditionname);
}
@ -945,8 +945,8 @@ standard_ProcessUtility(Node *parsetree,
case T_UnlistenStmt:
{
UnlistenStmt *stmt = (UnlistenStmt *) parsetree;
PreventCommandDuringRecovery();
PreventCommandDuringRecovery();
CheckRestrictedOperation("UNLISTEN");
if (stmt->conditionname)
Async_Unlisten(stmt->conditionname);
@ -1105,8 +1105,8 @@ standard_ProcessUtility(Node *parsetree,
case T_ReindexStmt:
{
ReindexStmt *stmt = (ReindexStmt *) parsetree;
PreventCommandDuringRecovery();
PreventCommandDuringRecovery();
switch (stmt->kind)
{
case OBJECT_INDEX: