digraph G {
    rankdir = LR
       
    node
    [
        fontname    = "Inconsolata"
        fontsize    = 20
        shape       = record
        style       = rounded
        margin      = "0.2,0.2"
    ]

    edge
    [
        fontname    = "Inconsolata"
        fontsize    = 18
        arrowhead   = vee
        arrowtail   = vee
        arrowsize   = 2
    ]

    "Event source 1" -> "Wait for\nan event\nto happen"
    "Event source 2" -> "Wait for\nan event\nto happen"
    "Event source N" -> "Wait for\nan event\nto happen"

    "Wait for\nan event\nto happen" -> "Handle an\nevent" [label="Something happened...\n", tailport="n", headport="n"]
    "Handle an\nevent" -> "Wait for\nan event\nto happen" [tailport="s", headport="s"]
}