Minimally functional segmented power network, with functional per-tick limited throughput

Have to add a little multiblock rendering
Are you okay? - Yeah, i just need to `add a little more multiblock rendering`
Rend-er-ing
Rend
and R in ING is RENDER-MAN
Hard Rendy the Bender Render Fender

src/main/kotlin/ru/dbotthepony/mc/otm/GlobalEventHandler.kt

@@ -222,7 +222,7 @@ fun tickServer(ticker: IConditionalTickable) {
 	postServerTick.add(ticker, SERVER_IS_LIVE, "Server is stopping")
 }
 
-fun Level.timer(time: Int, ticker: Runnable): TickList.Timer? {
+fun Level.once(time: Int, ticker: Runnable): TickList.Timer? {
 	if (this.isClientSide) return null
 
 	if (!SERVER_IS_LIVE) {

src/main/kotlin/ru/dbotthepony/mc/otm/block/entity/cable/EnergyCableBlockEntity.kt

@@ -15,9 +15,13 @@ import ru.dbotthepony.mc.otm.capability.FlowDirection
 import ru.dbotthepony.mc.otm.capability.MatteryCapability
 import ru.dbotthepony.mc.otm.capability.energy.IMatteryEnergyStorage
 import ru.dbotthepony.mc.otm.config.CablesConfig
+import ru.dbotthepony.mc.otm.core.get
 import ru.dbotthepony.mc.otm.core.math.BlockRotation
 import ru.dbotthepony.mc.otm.core.math.Decimal
 import ru.dbotthepony.mc.otm.core.math.RelativeSide
+import ru.dbotthepony.mc.otm.core.set
+import ru.dbotthepony.mc.otm.core.util.TickList
+import ru.dbotthepony.mc.otm.core.util.countingLazy
 import ru.dbotthepony.mc.otm.graph.GraphNode
 import ru.dbotthepony.mc.otm.once
 import ru.dbotthepony.mc.otm.onceServer
@@ -37,7 +41,7 @@ abstract class EnergyCableBlockEntity(type: BlockEntityType<*>, blockPos: BlockP
 				field = value
 
 				if (value) {
-					node.graph.livelyNodes.add(node)
+					node.graph.addLivelyNode(node)
 				}
 			}
 
@@ -55,7 +59,7 @@ abstract class EnergyCableBlockEntity(type: BlockEntityType<*>, blockPos: BlockP
 					if (isEnabled) {
 						if (neighbour.isPresent) {
 							if (neighbour.get() !is CableSide) {
-								node.graph.livelyNodes.add(node)
+								node.graph.addLivelyNode(node)
 							}
 						}
 
@@ -90,7 +94,27 @@ abstract class EnergyCableBlockEntity(type: BlockEntityType<*>, blockPos: BlockP
 			get() = Decimal.POSITIVE_INFINITY
 	}
 
+	private val isPoweredState by countingLazy(blockStateChangesCounter) {
+		this.blockState[BlockStateProperties.POWERED]
+	}
+
 	inner class Node : GraphNode<Node, EnergyCableGraph>(::EnergyCableGraph) {
+		private var _segment = EnergyCableGraph.Segment(this)
+
+		var segment: EnergyCableGraph.Segment
+			get() { return _segment }
+			set(value) {
+				if (_segment === value) return
+				_segment.remove(this)
+				value.add(this)
+				_segment = value
+			}
+
+		fun onInvalidate() {
+			_segment = EnergyCableGraph.Segment(this)
+			updatePoweredState(false)
+		}
+
 		val sides get() = energySides
 
 		override fun onNeighbour(link: Link) {
@@ -105,6 +129,35 @@ abstract class EnergyCableBlockEntity(type: BlockEntityType<*>, blockPos: BlockP
 			}
 		}
 
+		private var updateTimer: TickList.Timer? = null
+		private var ongoingNewState: Boolean? = null
+
+		fun updatePoweredState(newState: Boolean) {
+			if (isRemoved) return
+			val level = level ?: return
+
+			if (isPoweredState != newState || ongoingNewState != newState) {
+				updateTimer?.cancel()
+
+				if (isPoweredState == newState) {
+					ongoingNewState = null
+					updateTimer?.cancel()
+				} else {
+					ongoingNewState = newState
+
+					// reduces flickering and block updates pressure
+					updateTimer = level.once(4) {
+						ongoingNewState = null
+						updateTimer = null
+
+						if (!isRemoved) {
+							level.setBlock(blockPos, blockState.set(BlockStateProperties.POWERED, newState), Block.UPDATE_CLIENTS)
+						}
+					}
+				}
+			}
+		}
+
 		val blockEntity get() = this@EnergyCableBlockEntity
 		val canTraverse get() = energyThroughput > Decimal.ZERO
 		val energyThroughput get() = this@EnergyCableBlockEntity.energyThroughput
@@ -115,30 +168,14 @@ abstract class EnergyCableBlockEntity(type: BlockEntityType<*>, blockPos: BlockP
 		if (!SERVER_IS_LIVE) return
 		val level = level
 
-		val powered = node.graph.livelyNodes.filter {
-			it.blockEntity.energySides.filter {
-					side -> side.value.neighbour.isPresent && side.value.neighbour.get() !is CableSide
-			}.isNotEmpty()
-		}.size >= 2
-
 		level?.once {
 			if (!node.isValid) return@once
 
 			val newState = blockState
 				.setValue(CableBlock.MAPPING_CONNECTION_PROP[side]!!, status)
-				.setValue(BlockStateProperties.POWERED, powered)
 
 			if (newState !== blockState && SERVER_IS_LIVE)
 				level.setBlock(blockPos, newState, Block.UPDATE_CLIENTS)
-
-			node.graph.livelyNodes.forEach {
-				if (it.isValid) {
-					val newState = it.blockEntity.blockState.setValue(BlockStateProperties.POWERED, powered)
-
-					if (newState !== it.blockEntity.blockState && SERVER_IS_LIVE)
-						level.setBlock(it.blockEntity.blockPos, newState, Block.UPDATE_CLIENTS)
-				}
-			}
 		}
 	}
 
@@ -154,7 +191,9 @@ abstract class EnergyCableBlockEntity(type: BlockEntityType<*>, blockPos: BlockP
 
 	override fun setLevel(level: Level) {
 		super.setLevel(level)
-		node.discover(this, MatteryCapability.ENERGY_CABLE_NODE)
+
+		if (!level.isClientSide)
+			node.discover(this, MatteryCapability.ENERGY_CABLE_NODE)
 	}
 
 	override fun setRemoved() {

src/main/kotlin/ru/dbotthepony/mc/otm/block/entity/cable/EnergyCableGraph.kt

@@ -1,37 +1,245 @@
 package ru.dbotthepony.mc.otm.block.entity.cable
 
+import it.unimi.dsi.fastutil.objects.Reference2ObjectOpenHashMap
+import net.minecraft.core.BlockPos
+import org.apache.logging.log4j.LogManager
+import ru.dbotthepony.mc.otm.UNIVERSE_TICKS
 import ru.dbotthepony.mc.otm.capability.receiveEnergy
 import ru.dbotthepony.mc.otm.core.math.Decimal
 import ru.dbotthepony.mc.otm.core.math.RelativeSide
+import ru.dbotthepony.mc.otm.core.shuffle
 import ru.dbotthepony.mc.otm.graph.GraphNodeList
+import ru.dbotthepony.mc.otm.onceServer
 import java.util.*
+import kotlin.collections.ArrayList
+import kotlin.collections.HashSet
 import kotlin.math.ln
 
 class EnergyCableGraph : GraphNodeList<EnergyCableBlockEntity.Node, EnergyCableGraph>() {
-	val livelyNodes = HashSet<EnergyCableBlockEntity.Node>()
+	private val livelyNodes = HashSet<EnergyCableBlockEntity.Node>()
+	private val livelyNodesList = ArrayList<EnergyCableBlockEntity.Node>()
 
-	private val pathCache = HashMap<Pair<EnergyCableBlockEntity.Node, EnergyCableBlockEntity.Node>, Decimal?>()
+	fun addLivelyNode(node: EnergyCableBlockEntity.Node) {
+		require(node in nodesSet) { "$node does not belong to $this" }
+
+		if (livelyNodes.add(node)) {
+			livelyNodesList.add(node)
+		}
+	}
+
+	// TODO: LRU cache?
+	private val pathCache = HashMap<Pair<EnergyCableBlockEntity.Node, EnergyCableBlockEntity.Node>, ArrayList<SegmentPath?>>()
 
 	private class SearchNode(val node: EnergyCableBlockEntity.Node, target: EnergyCableBlockEntity.Node, var parent: SearchNode? = null) : Comparable<SearchNode> {
-		val heuristics: Double = node.position.distSqr(target.position) * 0.0001 - ln(node.energyThroughput.coerceAtMost(Decimal.LONG_MAX_VALUE).toDouble())
+		val heuristics: Double = node.position.distSqr(target.position) * 0.0001 - ln(node.segment.availableThroughput.coerceAtMost(Decimal.LONG_MAX_VALUE).toDouble())
 
 		override fun compareTo(other: SearchNode): Int {
 			return heuristics.compareTo(other.heuristics)
 		}
 	}
 
-	fun invalidatePathCache() {
-		pathCache.clear()
+	class SegmentPath(private val a: BlockPos, private val b: BlockPos) {
+		val segments = HashSet<Segment>()
+		private var shortCircuit = false
+		private var lastTickTransfers = 0
+		private var lastTick = 0
+
+		val availableThroughput: Decimal
+			get() = segments.minOfOrNull { it.availableThroughput } ?: Decimal.ZERO
+
+		fun transfer(amount: Decimal, simulate: Boolean, instantSnapshot: MutableMap<Segment, Decimal>): Decimal {
+			if (!amount.isPositive || shortCircuit) {
+				return Decimal.ZERO
+			}
+
+			if (lastTickTransfers++ >= 40000) {
+				if (lastTick == UNIVERSE_TICKS) {
+					shortCircuit = true
+					LOGGER.warn("Cable path from $a to $b appears to be a short circuit, disabling.")
+				} else {
+					lastTick = UNIVERSE_TICKS
+					lastTickTransfers = 0
+				}
+			}
+
+			var min = amount
+
+			for (segment in segments) {
+				min = minOf(segment.transfer(amount, instantSnapshot), min)
+				if (!min.isPositive) return Decimal.ZERO
+			}
+
+			if (!simulate)
+				segments.forEach { it.transfer(min) }
+
+			return min
+		}
+
+		fun remove() {
+			segments.toTypedArray().forEach { it.remove(this) }
+		}
 	}
 
-	private fun getPath(a: EnergyCableBlockEntity.Node, b: EnergyCableBlockEntity.Node): Decimal? {
+	// TODO: Actual segment logic (merging segments)
+	class Segment() {
+		constructor(node: EnergyCableBlockEntity.Node) : this() {
+			nodes.add(node)
+		}
+
+		private val nodes = HashSet<EnergyCableBlockEntity.Node>()
+		private val paths = HashSet<SegmentPath>()
+
+		var throughput = Decimal.ZERO
+			private set
+
+		var transferredLastTick = Decimal.ZERO
+			private set
+
+		val availableThroughput: Decimal
+			get() = throughput - transferredLastTick
+
+		private var throughputKnown = false
+		private var lastTick = 0
+		private var lastPoweredStatus = 0
+
+		private fun updateBlockstates(): Boolean {
+			if (lastTick + 2 < UNIVERSE_TICKS) {
+				transferredLastTick = Decimal.ZERO
+				lastTick = UNIVERSE_TICKS
+			}
+
+			val newState = transferredLastTick.isPositive
+			val numState = if (newState) 1 else -1
+
+			if (numState != lastPoweredStatus) {
+				lastPoweredStatus = numState
+				nodes.forEach { if (it.segment === this) it.updatePoweredState(newState) }
+			}
+
+			return newState
+		}
+
+		private var hasBlockstateTimer = false
+
+		private fun blockstateUpdateStep() {
+			hasBlockstateTimer = updateBlockstates()
+
+			if (hasBlockstateTimer) {
+				onceServer(20) {
+					blockstateUpdateStep()
+				}
+			}
+		}
+
+		fun transfer(amount: Decimal, instantSnapshot: MutableMap<Segment, Decimal>): Decimal {
+			if (lastTick != UNIVERSE_TICKS) {
+				transferredLastTick = Decimal.ZERO
+				lastTick = UNIVERSE_TICKS
+			}
+
+			val currentTransferred = instantSnapshot[this] ?: transferredLastTick
+
+			if (currentTransferred >= throughput || !amount.isPositive) {
+				return Decimal.ZERO
+			}
+
+			val new = minOf(currentTransferred + amount, throughput)
+			val diff = new - currentTransferred
+			instantSnapshot[this] = new
+			return diff
+		}
+
+		fun transfer(amount: Decimal): Decimal {
+			if (lastTick != UNIVERSE_TICKS) {
+				transferredLastTick = Decimal.ZERO
+				lastTick = UNIVERSE_TICKS
+			}
+
+			if (transferredLastTick >= throughput || !amount.isPositive) {
+				return Decimal.ZERO
+			}
+
+			val new = minOf(transferredLastTick + amount, throughput)
+			val diff = new - transferredLastTick
+			transferredLastTick = new
+
+			if (!hasBlockstateTimer) {
+				blockstateUpdateStep()
+			}
+
+			return diff
+		}
+
+		fun remove(node: EnergyCableBlockEntity.Node) {
+			check(nodes.remove(node)) { "Tried to remove node $node from segment $this, but that node does not belong to this segment" }
+
+			if (nodes.isEmpty())
+				throughput = Decimal.ZERO
+			else
+				throughput = nodes.maxOf { it.energyThroughput }
+		}
+
+		fun add(node: EnergyCableBlockEntity.Node) {
+			check(nodes.add(node)) { "Tried to add node $node to segment $this, but we already have that node added" }
+			throughput = maxOf(throughput, node.energyThroughput)
+		}
+
+		fun add(path: SegmentPath) {
+			check(paths.add(path)) { "Path $path should already contain $this" }
+			check(path.segments.add(this)) { "Path set and Segment disagree whenever $this is absent from $path" }
+
+			if (!throughputKnown) {
+				throughput = nodes.maxOf { it.energyThroughput }
+				throughputKnown = true
+			}
+		}
+
+		fun remove(path: SegmentPath) {
+			check(paths.remove(path)) { "Path $path shouldn't contain $this" }
+			check(path.segments.remove(this)) { "Path set and Segment disagree whenever $this is present in $path" }
+		}
+
+		// breaks "instant snapshots" of segments atm
+		// shouldn't cause major gameplay issues though
+		fun split(): List<Segment> {
+			if (nodes.isEmpty()) {
+				throw IllegalStateException("Empty segment somehow?")
+			} else if (nodes.size == 1) {
+				return listOf(this)
+			} else {
+				lastPoweredStatus = 0
+				val list = ArrayList(nodes)
+				val itr = list.iterator()
+				itr.next()
+				val result = ArrayList<Segment>()
+				result.add(this)
+
+				for (v in itr) {
+					v.segment = Segment()
+					v.segment.paths.addAll(paths)
+					paths.forEach { it.segments.add(v.segment) }
+					result.add(v.segment)
+				}
+
+				return result
+			}
+		}
+	}
+
+	fun invalidatePathCache() {
+		pathCache.clear()
+		nodes.forEach { it.onInvalidate() }
+	}
+
+	// TODO: Multiple paths, so energy can be delivered to receiver through different paths if previously found path is congested
+	private fun getPath(a: EnergyCableBlockEntity.Node, b: EnergyCableBlockEntity.Node, energyToTransfer: Decimal): SegmentPath? {
 		if (!a.canTraverse || !b.canTraverse)
 			return null
 
-		val key = a to b
+		val list = pathCache.computeIfAbsent(a to b) { ArrayList(1) }
 
-		if (key in pathCache)
-			return pathCache[key]
+		if (list.isNotEmpty())
+			return list.first
 
 		// no free paths available, try to find extra one
 		// while this use A* algorithm, this is done purely for biasing search towards end point (to speed up search),
@@ -57,9 +265,13 @@ class EnergyCableGraph : GraphNodeList<EnergyCableBlockEntity.Node, EnergyCableG
 					last = last.parent
 				}
 
-				val calc = solution.minOf { it.energyThroughput }
-				pathCache[key] = calc
-				return calc
+				val touchedSegments = ArrayList<Segment>()
+				solution.forEach { touchedSegments.addAll(it.segment.split()) }
+				val path = SegmentPath(a.blockEntity.blockPos, b.blockEntity.blockPos)
+				touchedSegments.forEach { it.add(path) }
+
+				list.add(path)
+				return path
 			} else {
 				for (neighbour in first.node.neighboursView.values) {
 					if (!seenNodes.add(neighbour) || !neighbour.canTraverse) continue
@@ -69,24 +281,31 @@ class EnergyCableGraph : GraphNodeList<EnergyCableBlockEntity.Node, EnergyCableG
 		}
 
 		// solution does not exist
-		pathCache[key] = null
+		list.add(null)
 		return null
 	}
 
 	override fun onNodeRemoved(node: EnergyCableBlockEntity.Node) {
-		livelyNodes.remove(node)
+		if (livelyNodes.remove(node)) {
+			check(livelyNodesList.remove(node))
+		}
+
 		invalidatePathCache()
 	}
 
 	override fun onNodeAdded(node: EnergyCableBlockEntity.Node) {
-		livelyNodes.add(node)
+		check(livelyNodes.add(node))
+		livelyNodesList.add(node)
 		invalidatePathCache()
 	}
 
 	fun receiveEnergy(howMuch: Decimal, simulate: Boolean, fromNode: EnergyCableBlockEntity.Node, fromSide: RelativeSide): Decimal {
-		val itr = livelyNodes.iterator()
+		livelyNodesList.shuffle(fromNode.blockEntity.level!!.random)
+
+		val itr = livelyNodesList.iterator()
 		var received = Decimal.ZERO
 		var residue = howMuch.coerceAtMost(fromNode.energyThroughput)
+		val snapshot = Reference2ObjectOpenHashMap<Segment, Decimal>()
 
 		for (node in itr) {
 			var hit = false
@@ -100,11 +319,11 @@ class EnergyCableGraph : GraphNodeList<EnergyCableBlockEntity.Node, EnergyCableG
 
 					side.neighbour.get()?.let {
 						if (it !is EnergyCableBlockEntity.CableSide) {
-							val limit = getPath(fromNode, node)
+							val path = getPath(fromNode, node, residue)
 							hit = true
 
-							if (limit != null) {
-								val thisReceived = it.receiveEnergy(residue.coerceAtMost(limit), simulate)
+							if (path != null) {
+								val thisReceived = it.receiveEnergy(path.transfer(residue, simulate, snapshot), simulate)
 								received += thisReceived
 								residue -= thisReceived
 								if (!residue.isPositive) return received
@@ -116,9 +335,14 @@ class EnergyCableGraph : GraphNodeList<EnergyCableBlockEntity.Node, EnergyCableG
 
 			if (!hit) {
 				itr.remove()
+				check(livelyNodes.remove(node))
 			}
 		}
 
 		return received
 	}
+
+	companion object {
+		private val LOGGER = LogManager.getLogger()
+	}
 }

src/main/kotlin/ru/dbotthepony/mc/otm/client/render/MultiblockRendering.kt

@@ -54,6 +54,22 @@ fun IMultiblockAccess.render(
 	val nodes = currentNodes
 
 	for (node in nodes.values) {
+		if (node.displayBlocks.isNotEmpty() && node.status == NodeStatus.VALID) {
+			continue
+		}
+
+		// TODO: rendering
+		// TODO: rendering
+		// TODO: rendering
+		// TODO: Rendering
+		// TODO: Rendering...
+		// TODO: Rendering!..
+		// TODO: Rendering!..
+		// TODO: Rendering!
+		// TODO: Rendering!!
+		// TODO: RENDERING!!
+		// TODO: RENDERING!!!
+
 		val color = when (node.status) {
 			NodeStatus.UNKNOWN -> UNKNOWN
 			NodeStatus.VALID -> VALID

src/main/kotlin/ru/dbotthepony/mc/otm/core/math/BlockRotation.kt

@@ -74,7 +74,7 @@ enum class BlockRotation(
 
 	init {
 		val crossproduct = front.normal.cross(top.normal)
-		right = Direction.values().first { it.normal == crossproduct }
+		right = Direction.entries.first { it.normal == crossproduct }
 	}
 
 	val left: Direction = right.opposite
@@ -165,7 +165,7 @@ enum class BlockRotation(
 		private val mapped = EnumMap<Direction, EnumMap<Direction, BlockRotation>>(Direction::class.java)
 
 		init {
-			for (value in values()) {
+			for (value in entries) {
 				val (front, top) = value
 				mapped.computeIfAbsent(front) { EnumMap(Direction::class.java) }.put(top, value)
 			}

src/main/kotlin/ru/dbotthepony/mc/otm/core/multiblock/IMultiblockNode.kt

@@ -1,8 +1,12 @@
 package ru.dbotthepony.mc.otm.core.multiblock
 
 import net.minecraft.core.BlockPos
+import net.minecraft.world.level.block.state.BlockState
 
 interface IMultiblockNode {
 	val pos: BlockPos
 	val status: NodeStatus
+
+	val displayBlocks: List<BlockState>
+		get() = listOf()
 }

src/main/kotlin/ru/dbotthepony/mc/otm/core/multiblock/ShapedMultiblock.kt

@@ -85,6 +85,8 @@ class ShapedMultiblock(pos: BlockPos, factory: ShapedMultiblockFactory) : IMulti
 			private var lastSuccessfulPathPredicate = -1
 			private var lastSuccessfulPathChildren = -1
 
+			override val displayBlocks: List<BlockState> = prototype.displayBlocks.asList()
+
 			override var status: NodeStatus = NodeStatus.UNKNOWN
 				private set
 

src/main/kotlin/ru/dbotthepony/mc/otm/core/multiblock/ShapedMultiblockBuilder.kt

@@ -51,6 +51,7 @@ class ShapedMultiblockBuilder {
 		val blockStateTags = ObjectArraySet<Any>()
 		val blockTags = ObjectArraySet<Any>()
 		val blockEntityTags = ObjectArraySet<BlockEntityTag<*>>()
+		val displayBlocks = HashSet<BlockState>()
 
 		/**
 		 * Marks this node report its block in [ShapedMultiblock.blockStates] method when called with specified [value]
@@ -192,6 +193,7 @@ class ShapedMultiblockBuilder {
 				ImmutableSet.copyOf(blockStateTags),
 				ImmutableSet.copyOf(blockTags),
 				ImmutableSet.copyOf(blockEntityTags),
+				ImmutableSet.copyOf(displayBlocks)
 			)
 		}
 

src/main/kotlin/ru/dbotthepony/mc/otm/core/multiblock/ShapedMultiblockFactory.kt

@@ -4,6 +4,7 @@ import com.google.common.collect.ImmutableList
 import com.google.common.collect.ImmutableSet
 import net.minecraft.core.BlockPos
 import net.minecraft.world.level.block.Rotation
+import net.minecraft.world.level.block.state.BlockState
 import ru.dbotthepony.mc.otm.core.collect.collect
 import ru.dbotthepony.mc.otm.core.collect.map
 import java.util.function.Predicate
@@ -17,6 +18,7 @@ class ShapedMultiblockFactory(val north: ImmutableSet<Part>, val customChecks: I
 		val blockStateTags: ImmutableSet<Any>,
 		val blockTags: ImmutableSet<Any>,
 		val blockEntityTags: ImmutableSet<BlockEntityTag<*>>,
+		val displayBlocks: ImmutableSet<BlockState>,
 	)
 
 	/**

src/main/kotlin/ru/dbotthepony/mc/otm/graph/GraphNodeList.kt

@@ -6,18 +6,20 @@ import java.lang.ref.WeakReference
 import java.util.*
 import kotlin.collections.ArrayDeque
 import kotlin.collections.ArrayList
+import kotlin.collections.HashSet
 
 open class GraphNodeList<N : GraphNode<N, G>, G : GraphNodeList<N, G>> : IConditionalTickable {
 	private val queuedAdd = ArrayDeque<N>()
 	private val queuedRemove = ArrayDeque<N>()
 	private val nodesInternal = ArrayList<N>()
+	private val nodesSetInternal = HashSet<N>()
 	private val conditional = ArrayList<IConditionalTickable>()
 	private val always = ArrayList<ITickable>()
 	private var isTicking = false
 	private var shouldQueueChanges = false
 
-	protected val nodes: List<N> = Collections.unmodifiableList(nodesInternal)
-
+	val nodes: List<N> = Collections.unmodifiableList(nodesInternal)
+	val nodesSet: Set<N> = Collections.unmodifiableSet(nodesSetInternal)
 	val size get() = nodesInternal.size
 
 	var isValid = true
@@ -36,7 +38,7 @@ open class GraphNodeList<N : GraphNode<N, G>, G : GraphNodeList<N, G>> : ICondit
 	}
 
 	fun beginTicking(node: N) {
-		require(node in nodesInternal || node in queuedAdd) { "Node $node does not belong to $this" }
+		require(node in nodesSetInternal || node in queuedAdd) { "Node $node does not belong to $this" }
 		if (node in queuedRemove) return
 
 		if (node is IConditionalTickable) {
@@ -53,6 +55,7 @@ open class GraphNodeList<N : GraphNode<N, G>, G : GraphNodeList<N, G>> : ICondit
 	private fun addNow(node: N) {
 		node.graph = this as G
 		nodesInternal.add(node)
+		nodesSetInternal.add(node)
 
 		if (node is IConditionalTickable) {
 			conditional.add(node)
@@ -69,6 +72,8 @@ open class GraphNodeList<N : GraphNode<N, G>, G : GraphNodeList<N, G>> : ICondit
 		if (removeFromList)
 			nodesInternal.remove(node)
 
+		nodesSetInternal.remove(node)
+
 		if (node is IConditionalTickable)
 			conditional.remove(node)
 		else if (node is ITickable)
@@ -108,7 +113,7 @@ open class GraphNodeList<N : GraphNode<N, G>, G : GraphNodeList<N, G>> : ICondit
 	fun addNodeQueued(node: N): Boolean {
 		check(isValid) { "$this is no longer valid" }
 
-		if (node in nodesInternal || node in queuedAdd)
+		if (node in nodesSetInternal || node in queuedAdd)
 			return false
 
 		queuedAdd.add(node)
@@ -119,7 +124,7 @@ open class GraphNodeList<N : GraphNode<N, G>, G : GraphNodeList<N, G>> : ICondit
 	fun addNode(node: N): Boolean {
 		check(isValid) { "$this is no longer valid" }
 
-		if (node in nodesInternal)
+		if (node in nodesSetInternal)
 			return false
 
 		if (shouldQueueChanges) {
@@ -137,7 +142,7 @@ open class GraphNodeList<N : GraphNode<N, G>, G : GraphNodeList<N, G>> : ICondit
 	fun removeNode(node: N): Boolean {
 		check(isValid) { "$this is no longer valid" }
 
-		if (node !in nodesInternal)
+		if (node !in nodesSetInternal)
 			return false
 
 		if (shouldQueueChanges) {
@@ -155,6 +160,7 @@ open class GraphNodeList<N : GraphNode<N, G>, G : GraphNodeList<N, G>> : ICondit
 	fun retain(nodes: Set<N>) {
 		check(isValid) { "$this is no longer valid" }
 		queuedAdd.retainAll(nodes)
+
 		nodesInternal.removeIf {
 			if (it !in nodes) {
 				removeNow(it, false)

src/main/kotlin/ru/dbotthepony/mc/otm/item/tool/RedstoneInteractorItem.kt

@@ -26,7 +26,7 @@ import ru.dbotthepony.mc.otm.core.math.plus
 import ru.dbotthepony.mc.otm.core.util.TickList
 import ru.dbotthepony.mc.otm.item.MatteryItem
 import ru.dbotthepony.mc.otm.registry.MDataComponentTypes
-import ru.dbotthepony.mc.otm.timer
+import ru.dbotthepony.mc.otm.once
 import java.util.*
 
 class RedstoneInteractorItem : MatteryItem(Properties().stacksTo(1)) {
@@ -79,7 +79,7 @@ class RedstoneInteractorItem : MatteryItem(Properties().stacksTo(1)) {
 		for (pos in positions) {
 			val shouldSendUpdate = pos !in map
 
-			val timer = context.level.timer(context.itemInHand.getOrDefault(MDataComponentTypes.TICK_TIMER, TickTimer.TICK_30).ticks) {
+			val timer = context.level.once(context.itemInHand.getOrDefault(MDataComponentTypes.TICK_TIMER, TickTimer.TICK_30).ticks) {
 				map.remove(pos)
 				context.level.updateNeighborsAt(pos, context.level.getBlockState(pos).block)
 			} ?: throw RuntimeException("Timer unexpectedly ended up being null")