.\" ----------
.\" listen_net
.\"
.\"	Copyright (c) 2003-2004, PostgreSQL Global Development Group
.\"	Author: Jan Wieck, Afilias USA INC.
.\"
.\" $Id: figure-2.pic,v 1.3 2004/02/22 15:42:53 wieck Exp $
.\" ----------
.PS
.ps -2
.vs 1m
Outer:	box invis wid 5.2 ht 6.2

define FileSymbol {
	ellipse wid 0.8 ht 0.25
	box wid 0.8 ht 0.2 invisible fill 0.0 with .s at last ellipse .c
	ellipse same with .c at last ellipse .c+(0.0,0.8)
	line from last box .sw to last ellipse .w
	line from last box .se to last ellipse .e
}

Node1:	box wid 1.5 ht 1.5 with .w at Outer.w
		"Node 1" at Node1.n below
DB1:	[ FileSymbol() ] with .e at Node1.e-(0.1,0.0)
		"DB1" with .c at DB1.c-(0.0,0.1)

		box wid 0.4 ht 0.4 with .w at Node1.w+(0.1,0.0) "slon"

Node2:	box wid 1.5 ht 1.5 with .n at Outer.n
		"Node 2" at Node2.n below
DB2:	[ FileSymbol() ] with .e at Node2.e-(0.1,0.0)
		"DB2" with .c at DB2.c-(0.0,0.1)

		box wid 0.4 ht 0.4 with .w at Node2.w+(0.1,0.0) "slon"

Node3:	box wid 1.5 ht 1.5 with .e at Outer.e
		"Node 3" at Node3.n below
DB3:	[ FileSymbol() ] with .e at Node3.e-(0.1,0.0)
		"DB3" with .c at DB3.c-(0.0,0.1)

		box wid 0.4 ht 0.4 with .w at Node3.w+(0.1,0.0) "slon"

Node4:	box wid 1.5 ht 1.5 with .se at Outer.se
		"Node 4" at Node4.n below

		box wid 0.4 ht 0.4 with .w at Node4.w+(0.1,0.0) "slon"

DB4:	[ FileSymbol() ] with .e at Node4.e-(0.1,0.0)
		"DB4" with .c at DB4.c-(0.0,0.1)

		line -> from Node3.n+(0.3,0.0) to Node2.se+(0.0,0.3)
		"Subscribe" at last line .c ljust above
		line <- from Node3.n+(-0.3,0.0) to Node2.se+(-0.3,0.0)
		"Enable subsciption" at last line .c rjust below
.PE