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export type OwnershipRegistry = {
add(targetId: string): void;
remove(targetId: string): void;
has(targetId: string): boolean;
list(): ReadonlyArray<string>;
replaceAll(ids: ReadonlyArray<string>): void;
setHarnessWindow(targetId: string | undefined): void;
harnessWindow(): string | undefined;
setHarnessWindowId(windowId: number | undefined): void;
harnessWindowId(): number | undefined;
onChange(cb: () => void): void;
};
export const createOwnershipRegistry = (
initial?: {
readonly ownedTargetIds?: ReadonlyArray<string>;
readonly harnessWindowTargetId?: string;
readonly harnessWindowId?: number;
},
): OwnershipRegistry => {
const owned = new Set<string>(initial?.ownedTargetIds ?? []);
let harnessWindow: string | undefined = initial?.harnessWindowTargetId;
let harnessWindowId: number | undefined = initial?.harnessWindowId;
let listener: (() => void) | null = null;
const notify = (): void => {
if (listener) listener();
};
return {
add(targetId) {
if (owned.has(targetId)) return;
owned.add(targetId);
notify();
},
remove(targetId) {
if (!owned.has(targetId) && harnessWindow !== targetId) return;
owned.delete(targetId);
if (harnessWindow === targetId) harnessWindow = undefined;
notify();
},
has(targetId) {
return owned.has(targetId);
},
list() {
return [...owned];
},
replaceAll(ids) {
owned.clear();
for (const id of ids) owned.add(id);
notify();
},
setHarnessWindow(targetId) {
if (harnessWindow === targetId) return;
harnessWindow = targetId;
notify();
},
harnessWindow() {
return harnessWindow;
},
setHarnessWindowId(windowId) {
if (harnessWindowId === windowId) return;
harnessWindowId = windowId;
notify();
},
harnessWindowId() {
return harnessWindowId;
},
onChange(cb) {
listener = cb;
},
};
};
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