50 lines
1.4 KiB
Nim
50 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, options, tables]
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from ./actors import Ref, hash
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from ./protocols/sturdy import Oid
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proc hash(r: Ref): 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 `Ref` values.
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byOid: Table[Oid, WireSymbol]
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byRef: Table[Ref, WireSymbol]
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WireSymbol* = ref object
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oid: Oid
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`ref`: Ref
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count: int
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when not defined(release):
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mem: Membrane
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proc oid*(sym: WireSymbol): Oid = sym.oid
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proc `ref`*(sym: WireSymbol): Ref = sym.ref
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proc grab*(mem: Membrane; key: Oid|Ref): WireSymbol =
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## Grab a `WireSymbol` from a `Membrane`.
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result =
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when key is Oid: mem.byOid.getOrDefault(key)
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elif key is Ref: mem.byRef.getOrDefault(key)
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else: {.error.}
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if not result.isNil: inc result.count
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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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when not defined(release): assert sym.mem == mem
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assert sym.count > 0
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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.byRef.del sym.`ref`
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proc newWireSymbol*(mem: var Membrane; o: Oid; r: Ref): WireSymbol =
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## Allocate a `WireSymbol` at a `Membrane`.
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result = WireSymbol(oid: o, `ref`: r)
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when not defined(release): result.mem = mem
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mem.byOid[result.oid] = result
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mem.byRef[result.`ref`] = result
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