46 lines
1.2 KiB
Nim
46 lines
1.2 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 ./actors
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from ./protocols/sturdy import Oid
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proc hash(r: Cap): Hash = !$(r.relay.hash !& r.target.unsafeAddr.hash)
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type
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Membrane* = object
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## Bidirectional mapping between `Oid` and `Cap` values.
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## https://synit.org/book/protocol.html#membranes
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byOid: Table[Oid, WireSymbol]
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byCap: Table[Cap, WireSymbol]
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WireSymbol* = ref object
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oid: Oid
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cap: Cap
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count: int
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proc oid*(sym: WireSymbol): Oid = sym.oid
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proc cap*(sym: WireSymbol): Cap = sym.cap
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proc grab*(mem: Membrane; key: Oid): WireSymbol =
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## Grab a `WireSymbol` from a `Membrane`.
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mem.byOid.getOrDefault(key)
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proc grab*(mem: Membrane; key: Cap): WireSymbol =
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## Grab a `WireSymbol` from a `Membrane`.
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mem.byCap.getOrDefault(key)
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proc drop*(mem: var Membrane; sym: WireSymbol) =
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## Drop a `WireSymbol` from a `Membrane`.
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dec sym.count
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if sym.count < 1:
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mem.byOid.del sym.oid
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mem.byCap.del sym.cap
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proc newWireSymbol*(mem: var Membrane; o: Oid; r: Cap): WireSymbol =
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## Allocate a `WireSymbol` at a `Membrane`.
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result = WireSymbol(oid: o, cap: r, count: 1)
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mem.byOid[result.oid] = result
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mem.byCap[result.cap] = result
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