47 lines
1.4 KiB
Nim
47 lines
1.4 KiB
Nim
# SPDX-FileCopyrightText: ☭ 2022 Emery Hemingway
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# SPDX-License-Identifier: Unlicense
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import std/[hashes, tables]
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import preserves
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import ./actors, ./protocols/dataspace, ./skeletons
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from ./protocols/protocol import Handle
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template trace(args: varargs[untyped]): untyped = stderr.writeLine(args)
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type
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Observe = dataspace.Observe[Ref]
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Turn = actors.Turn
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Dataspace {.final.} = ref object of Entity
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index: Index
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handleMap: Table[Handle, Assertion]
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method publish(ds: Dataspace; turn: var Turn; v: Assertion; h: Handle) =
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if add(ds.index, turn, v):
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var obs: Observe
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if obs.fromPreserve v:
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ds.index.add(turn, obs.pattern, unembed obs.observer)
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ds.handleMap[h] = v
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method retract(ds: Dataspace; turn: var Turn; h: Handle) =
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try:
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let v = ds.handleMap[h]
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if remove(ds.index, turn, v):
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ds.handleMap.del h
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var obs: Observe
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if obs.fromPreserve v:
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ds.index.remove(turn, obs.pattern, unembed obs.observer)
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except KeyError: discard
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method message(ds: Dataspace; turn: var Turn; v: Assertion) =
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ds.index.deliverMessage(turn, v)
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type BootProc = proc (ds: Ref; turn: var Turn) {.gcsafe.}
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proc bootDataspace*(name: string; bootProc: BootProc): Actor {.discardable.} =
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bootActor(name) do (turn: var Turn):
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discard turn.facet.preventInertCheck()
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let ds = newRef(turn, Dataspace(index: initIndex()))
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bootProc(ds, turn)
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