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import type {
HolderGetResult,
IHolderStorage,
} from './holder-storage.interface.mjs'
import type { InstanceHolder } from './instance-holder.mjs'
import { InjectableScope, InjectableType } from '../../enums/index.mjs'
import { DIError } from '../../errors/index.mjs'
import { InstanceStatus } from './instance-holder.mjs'
/**
* Unified storage implementation that works the same way regardless of scope.
* Replaces RequestContext, HolderManager, SingletonStorage, RequestStorage.
*
* Scope is just metadata - storage operations are identical for all scopes.
* Different storage instances are just isolated storage spaces.
*/
export class UnifiedStorage implements IHolderStorage {
readonly scope: InjectableScope
private readonly holders = new Map<string, InstanceHolder>()
/**
* Reverse dependency index: maps a dependency name to the set of holder names that depend on it.
* This allows O(1) lookup of dependents instead of O(n) iteration.
*/
private readonly dependents = new Map<string, Set<string>>()
constructor(scope: InjectableScope = InjectableScope.Singleton) {
this.scope = scope
}
get<T = unknown>(instanceName: string): HolderGetResult<T> {
const holder = this.holders.get(instanceName)
if (!holder) {
return null
}
// Check holder status for error states
switch (holder.status) {
case InstanceStatus.Destroying:
return [
DIError.instanceDestroying(instanceName),
holder as InstanceHolder<T>,
]
case InstanceStatus.Error:
return [
holder.instance as unknown as DIError,
holder as InstanceHolder<T>,
]
case InstanceStatus.Creating:
case InstanceStatus.Created:
return [undefined, holder as InstanceHolder<T>]
default:
return null
}
}
set(instanceName: string, holder: InstanceHolder): void {
this.holders.set(instanceName, holder)
// Register dependencies in reverse index
if (holder.deps.size > 0) {
this.registerDependencies(instanceName, holder.deps)
}
}
delete(instanceName: string): boolean {
const holder = this.holders.get(instanceName)
if (holder) {
// Remove this holder from the reverse index for all its dependencies
this.removeFromDependentsIndex(instanceName, holder.deps)
}
return this.holders.delete(instanceName)
}
createHolder<T>(
instanceName: string,
type: InjectableType,
deps: Set<string>,
): [
ReturnType<typeof Promise.withResolvers<[undefined, T]>>,
InstanceHolder<T>,
] {
const deferred = Promise.withResolvers<[undefined, T]>()
const holder: InstanceHolder<T> = {
status: InstanceStatus.Creating,
name: instanceName,
instance: null,
creationPromise: deferred.promise,
destroyPromise: null,
type,
scope: this.scope,
deps,
destroyListeners: [],
createdAt: Date.now(),
waitingFor: new Set(),
}
return [deferred, holder]
}
storeInstance(instanceName: string, instance: unknown): void {
const holder = this.holders.get(instanceName)
if (holder) {
throw DIError.storageError(
'Instance already stored',
'storeInstance',
instanceName,
)
}
this.set(instanceName, {
status: InstanceStatus.Created,
name: instanceName,
instance,
creationPromise: null,
destroyPromise: null,
type: InjectableType.Class,
scope: this.scope,
deps: new Set(),
destroyListeners:
typeof instance === 'object' &&
instance !== null &&
'onServiceDestroy' in instance
? [(instance as OnServiceDestroy).onServiceDestroy]
: [],
createdAt: Date.now(),
waitingFor: new Set(),
})
}
handles(scope: InjectableScope): boolean {
return scope === this.scope
}
// ============================================================================
// ITERATION AND QUERY
// ============================================================================
getAllNames(): string[] {
return Array.from(this.holders.keys())
}
forEach(callback: (name: string, holder: InstanceHolder) => void): void {
for (const [name, holder] of this.holders) {
callback(name, holder)
}
}
findByInstance(instance: unknown): InstanceHolder | null {
for (const holder of this.holders.values()) {
if (holder.instance === instance) {
return holder
}
}
return null
}
findDependents(instanceName: string): string[] {
const dependents = this.dependents.get(instanceName)
return dependents ? Array.from(dependents) : []
}
/**
* Updates dependency references when instance names change.
* Used during scope upgrades when instance names are regenerated with requestId.
*
* @param oldName The old instance name
* @param newName The new instance name
*/
updateDependencyReference(oldName: string, newName: string): void {
// Update all holders that reference oldName in their deps Set
for (const holder of this.holders.values()) {
if (holder.deps.has(oldName)) {
holder.deps.delete(oldName)
holder.deps.add(newName)
}
}
// Update reverse dependency index
const oldDependents = this.dependents.get(oldName)
if (oldDependents) {
// Move dependents from old name to new name
const newDependents = this.dependents.get(newName) || new Set<string>()
for (const dependent of oldDependents) {
newDependents.add(dependent)
}
this.dependents.set(newName, newDependents)
this.dependents.delete(oldName)
}
// Update reverse index entries - if oldName was a dependency, update all holders that depend on it
for (const [depName, dependents] of this.dependents.entries()) {
Iif (depName === oldName) {
// This shouldn't happen, but handle it just in case
const newDependents = this.dependents.get(newName) || new Set<string>()
for (const dependent of dependents) {
newDependents.add(dependent)
}
this.dependents.set(newName, newDependents)
this.dependents.delete(oldName)
}
}
}
// ============================================================================
// INTERNAL HELPERS
// ============================================================================
/**
* Registers a holder's dependencies in the reverse index.
*/
private registerDependencies(holderName: string, deps: Set<string>): void {
for (const dep of deps) {
let dependents = this.dependents.get(dep)
if (!dependents) {
dependents = new Set()
this.dependents.set(dep, dependents)
}
dependents.add(holderName)
}
}
/**
* Removes a holder from the reverse dependency index.
*/
private removeFromDependentsIndex(
holderName: string,
deps: Set<string>,
): void {
for (const dep of deps) {
const dependents = this.dependents.get(dep)
Eif (dependents) {
dependents.delete(holderName)
Eif (dependents.size === 0) {
this.dependents.delete(dep)
}
}
}
}
}
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