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each link between a * dep and a sub is represented by a Link instance. * * A Link is also a node in two doubly-linked lists - one for the associated * sub to track all its deps, and one for the associated dep to track all its * subs. * * @internal */ export class Link { /** * - Before each effect run, all previous dep links' version are reset to -1 * - During the run, a link's version is synced with the source dep on access * - After the run, links with version -1 (that were never used) are cleaned * up */ version: number /** * Pointers for doubly-linked lists */ nextDep?: Link prevDep?: Link nextSub?: Link prevSub?: Link prevActiveLink?: Link constructor( public sub: Subscriber, public dep: Dep, ) { this.version = dep.version this.nextDep = this.prevDep = this.nextSub = this.prevSub = this.prevActiveLink = undefined } } /** * @internal */ export class Dep { version = 0 /** * Link between this dep and the current active effect */ activeLink?: Link = undefined /** * Doubly linked list representing the subscribing effects (tail) */ subs?: Link = undefined /** * Doubly linked list representing the subscribing effects (head) * DEV only, for invoking onTrigger hooks in correct order */ subsHead?: Link /** * For object property deps cleanup */ map?: KeyToDepMap = undefined key?: unknown = undefined /** * Subscriber counter */ sc: number = 0 constructor(public computed?: ComputedRefImpl | undefined) { if (__DEV__) { this.subsHead = undefined } } track(debugInfo?: DebuggerEventExtraInfo): Link | undefined { if (!activeSub || !shouldTrack || activeSub === this.computed) { return } let link = this.activeLink if (link === undefined || link.sub !== activeSub) { link = this.activeLink = new Link(activeSub, this) // add the link to the activeEffect as a dep (as tail) if (!activeSub.deps) { activeSub.deps = activeSub.depsTail = link } else { link.prevDep = activeSub.depsTail activeSub.depsTail!.nextDep = link activeSub.depsTail = link } addSub(link) } else if (link.version === -1) { // reused from last run - already a sub, just sync version link.version = this.version // If this dep has a next, it means it's not at the tail - move it to the // tail. This ensures the effect's dep list is in the order they are // accessed during evaluation. if (link.nextDep) { const next = link.nextDep next.prevDep = link.prevDep if (link.prevDep) { link.prevDep.nextDep = next } link.prevDep = activeSub.depsTail link.nextDep = undefined activeSub.depsTail!.nextDep = link activeSub.depsTail = link // this was the head - point to the new head if (activeSub.deps === link) { activeSub.deps = next } } } if (__DEV__ && activeSub.onTrack) { activeSub.onTrack( extend( { effect: activeSub, }, debugInfo, ), ) } return link } trigger(debugInfo?: DebuggerEventExtraInfo): void { this.version++ globalVersion++ this.notify(debugInfo) } notify(debugInfo?: DebuggerEventExtraInfo): void { startBatch() try { if (__DEV__) { // subs are notified and batched in reverse-order and then invoked in // original order at the end of the batch, but onTrigger hooks should // be invoked in original order here. for (let head = this.subsHead; head; head = head.nextSub) { if (head.sub.onTrigger && !(head.sub.flags & EffectFlags.NOTIFIED)) { head.sub.onTrigger( extend( { effect: head.sub, }, debugInfo, ), ) } } } for (let link = this.subs; link; link = link.prevSub) { if (link.sub.notify()) { // if notify() returns `true`, this is a computed. Also call notify // on its dep - it's called here instead of inside computed's notify // in order to reduce call stack depth. ;(link.sub as ComputedRefImpl).dep.notify() } } } finally { endBatch() } } } function addSub(link: Link) { link.dep.sc++ if (link.sub.flags & EffectFlags.TRACKING) { const computed = link.dep.computed // computed getting its first subscriber // enable tracking + lazily subscribe to all its deps if (computed && !link.dep.subs) { computed.flags |= EffectFlags.TRACKING | EffectFlags.DIRTY for (let l = computed.deps; l; l = l.nextDep) { addSub(l) } } const currentTail = link.dep.subs if (currentTail !== link) { link.prevSub = currentTail if (currentTail) currentTail.nextSub = link } if (__DEV__ && link.dep.subsHead === undefined) { link.dep.subsHead = link } link.dep.subs = link } } // The main WeakMap that stores {target -> key -> dep} connections. // Conceptually, it's easier to think of a dependency as a Dep class // which maintains a Set of subscribers, but we simply store them as // raw Maps to reduce memory overhead. type KeyToDepMap = Map<any, Dep> export const targetMap: WeakMap<object, KeyToDepMap> = new WeakMap() export const ITERATE_KEY: unique symbol = Symbol( __DEV__ ? 'Object iterate' : '', ) export const MAP_KEY_ITERATE_KEY: unique symbol = Symbol( __DEV__ ? 'Map keys iterate' : '', ) export const ARRAY_ITERATE_KEY: unique symbol = Symbol( __DEV__ ? 'Array iterate' : '', ) /** * Tracks access to a reactive property. * * This will check which effect is running at the moment and record it as dep * which records all effects that depend on the reactive property. * * @param target - Object holding the reactive property. * @param type - Defines the type of access to the reactive property. * @param key - Identifier of the reactive property to track. */ export function track(target: object, type: TrackOpTypes, key: unknown): void { if (shouldTrack && activeSub) { let depsMap = targetMap.get(target) if (!depsMap) { targetMap.set(target, (depsMap = new Map())) } let dep = depsMap.get(key) if (!dep) { depsMap.set(key, (dep = new Dep())) dep.map = depsMap dep.key = key } if (__DEV__) { dep.track({ target, type, key, }) } else { dep.track() } } } /** * Finds all deps associated with the target (or a specific property) and * triggers the effects stored within. * * @param target - The reactive object. * @param type - Defines the type of the operation that needs to trigger effects. * @param key - Can be used to target a specific reactive property in the target object. */ export function trigger( target: object, type: TriggerOpTypes, key?: unknown, newValue?: unknown, oldValue?: unknown, oldTarget?: Map<unknown, unknown> | Set<unknown>, ): void { const depsMap = targetMap.get(target) if (!depsMap) { // never been tracked globalVersion++ return } const run = (dep: Dep | undefined) => { if (dep) { if (__DEV__) { dep.trigger({ target, type, key, newValue, oldValue, oldTarget, }) } else { dep.trigger() } } } startBatch() if (type === TriggerOpTypes.CLEAR) { // collection being cleared // trigger all effects for target depsMap.forEach(run) } else { const targetIsArray = isArray(target) const isArrayIndex = targetIsArray && isIntegerKey(key) if (targetIsArray && key === 'length') { const newLength = Number(newValue) depsMap.forEach((dep, key) => { if ( key === 'length' || key === ARRAY_ITERATE_KEY || (!isSymbol(key) && key >= newLength) ) { run(dep) } }) } else { // schedule runs for SET | ADD | DELETE if (key !== void 0 || depsMap.has(void 0)) { run(depsMap.get(key)) } // schedule ARRAY_ITERATE for any numeric key change (length is handled above) if (isArrayIndex) { run(depsMap.get(ARRAY_ITERATE_KEY)) } // also run for iteration key on ADD | DELETE | Map.SET switch (type) { case TriggerOpTypes.ADD: if (!targetIsArray) { run(depsMap.get(ITERATE_KEY)) if (isMap(target)) { run(depsMap.get(MAP_KEY_ITERATE_KEY)) } } else if (isArrayIndex) { // new index added to array -> length changes run(depsMap.get('length')) } break case TriggerOpTypes.DELETE: if (!targetIsArray) { run(depsMap.get(ITERATE_KEY)) if (isMap(target)) { run(depsMap.get(MAP_KEY_ITERATE_KEY)) } } break case TriggerOpTypes.SET: if (isMap(target)) { run(depsMap.get(ITERATE_KEY)) } break } } } endBatch() } export function getDepFromReactive( object: any, key: string | number | symbol, ): Dep | undefined { const depMap = targetMap.get(object) return depMap && depMap.get(key) } |