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This page has not been adjusted for version 1.0 of the pico-engine |
Having a pico that maintains a collection of other picos is a pattern that is often useful.
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rule collection_subscriptions {
select when wrangler child_initialized
pre {
eci = event:attr("eci");
collection_eci = get_wellKnown_eci(eci);
}
if collection_eci then noop();
fired {
raise grouper event "need_subscriptions"
attributes event:attrattrs("rs_attrs").put("collection_eci",collection_eci);
}
} |
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This KRL code will respond to the internal event, expecting the collection_eci and the child_specs given to wrangler earlier (wrangler renames it rs_attrs for some reason).
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rule collection_subscription_requests {
select when grouper need_subscriptions
foreach by_prefix(event:attr("name_prefix")) setting(room_name,tag_id)
pre {
eci = building:eci(tag_id);
wellKnown_Tx = get_wellKnown_eci(eci).klog("wellKnown_Tx");
}
if wellKnown_Tx then every {
event:send({"eci":eci,"domain":"wrangler","type":"subscription",
"attrs": { "wellKnown_Tx": event:attr("collection_eci"),
"Rx_role": "member", "Tx_role": "collection",
"name": tag_id, "channel_type": "subscription" }
})
}
} |
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