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import { StorageEngine } from "../types";
/** @ignore */
export class IndexedDBStrategy implements StorageBase {
private db: IDBDatabase | null = null;
private memoryCache: Map<string, DataModel<ValueType>> = new Map();
private baseName: string;
private storeName: string;
private channel: BroadcastChannel;
private dbPromise: Promise<IDBDatabase> | null = null; // Melhoria 2: Para gerenciar a promessa de abertura do DB
constructor(baseName = "HybridWebCache", storeName?: string) {
this.baseName = baseName.trim().length === 0 ? "HybridWebCache" : baseName.trim();
this.storeName = storeName?.trim() ?? this.baseName;
this.channel = new BroadcastChannel(`${this.baseName}.${this.storeName}`);
this.channel.onmessage = this.handleSyncEvent.bind(this);
}
private handleSyncEvent(event: MessageEvent): void {
// Handle sync events for multi-instance communication
const action = event.data?.action || "";
switch (action) {
case "clear":
this.memoryCache.clear();
break;
case "unset": {
const { key } = event.data;
if (key) {
this.memoryCache.delete(key);
}
break;
}
case "sync": {
const { key, value } = event.data;
this.memoryCache.set(key, value);
break;
}
default:
break;
}
}
private async openDB(): Promise<IDBDatabase> {
if (this.db) return this.db;
if (this.dbPromise) return this.dbPromise; // em processo de abertura
this.dbPromise = new Promise((resolve, reject) => {
const request = indexedDB.open(this.baseName, 1);
request.onupgradeneeded = (event) => {
const db = (event.target as IDBOpenDBRequest).result;
if (!db.objectStoreNames.contains(this.storeName)) {
db.createObjectStore(this.storeName, { keyPath: "key" });
}
};
// request.onsuccess = () => resolve(request.result);
// request.onerror = () => reject(request.error);
request.onsuccess = (event) => {
this.db = (event.target as IDBOpenDBRequest).result;
this.dbPromise = null; // Clean up the promise after success
resolve(this.db);
};
request.onerror = (event) => {
console.error(`Failed to open IndexedDB: ${(event.target as IDBOpenDBRequest).error}`);
this.dbPromise = null; // Clean up the promise after success
reject((event.target as IDBOpenDBRequest).error);
};
});
return this.dbPromise;
}
private async execute<T>(transactionMode: IDBTransactionMode, operation: (store: IDBObjectStore) => IDBRequest): Promise<T> {
if (!this.db) await this.openDB();
if (!this.db) throw new Error("Database not initialized");
const transaction = this.db.transaction(this.storeName, transactionMode);
const store = transaction.objectStore(this.storeName);
const request = operation(store);
return new Promise((resolve, reject) => {
request.onsuccess = () => resolve(request.result);
request.onerror = () => reject(request.error);
transaction.onabort = () => reject(transaction.error || new Error("Transaction aborted"));
// transaction.oncomplete = () => console.log("Transaction complete success");
});
}
/** @internal */
async init(): Promise<void> {
await this.openDB();
if (!this.db) throw new Error("IndexedDB not open, cannot load memory cache.");
await this.getAll(); // Load existing data into memory cache
}
async set<T extends ValueType>(key: string, data: DataModel<T>): Promise<void> {
await this.execute("readwrite", (store) => store.put({ key, ...data }));
this.memoryCache.set(key, data);
this.channel.postMessage({ action: "sync", key, value: data });
}
setSync<T extends ValueType>(key: string, data: DataModel<T>): void {
this.memoryCache.set(key, data);
this.channel.postMessage({ action: "sync", key, value: data });
// this.executeQueue("readwrite", (store) => store.put({ key, ...data }));
this.execute("readwrite", (store) => store.put({ key, ...data }));
}
async get<T extends ValueType>(key: string): Promise<DataModel<T> | undefined> {
if (this.memoryCache.has(key)) {
return this.memoryCache.get(key) as DataModel<T>;
}
const data = await this.execute<DataModel<T>>("readonly", (store) => store.get(key));
if (data) {
this.memoryCache.set(key, data);
return data;
}
return undefined;
}
getSync<T extends ValueType>(key: string): DataModel<T> | undefined {
return this.memoryCache.has(key) ? (this.memoryCache.get(key) as DataModel<T>) : undefined;
}
async getAll<T extends ValueType>(): Promise<Map<string, DataModel<T>> | null> {
await this.openDB(); // Garante que o DB esteja aberto
if (!this.db) throw new Error("Database not initialized"); // Deve ser inatingível se openDB resolver
const transaction = this.db.transaction(this.storeName, "readonly");
const store = transaction.objectStore(this.storeName);
const request = store.openCursor();
return new Promise((resolve, reject) => {
const result = new Map<string, DataModel<T>>();
request.onsuccess = (event) => {
const cursor = (event.target as IDBRequest<IDBCursorWithValue>).result;
if (cursor) {
const storedData = cursor.value;
result.set(cursor.key as string, storedData);
cursor.continue();
} else {
// Cursor finished, now update memoryCache and resolve
this.memoryCache.clear();
result.forEach((value, key) => this.memoryCache.set(key, value));
resolve(result.size > 0 ? result : null);
}
};
request.onerror = () => reject(request.error);
transaction.onabort = () => reject(transaction.error || new Error("Transaction aborted"));
});
}
getAllSync<T extends ValueType>(): Map<string, DataModel<T>> | null {
return this.memoryCache.size > 0 ? (this.memoryCache as Map<string, DataModel<T>>) : null;
}
async has(key: string): Promise<boolean> {
if (this.memoryCache.has(key)) {
return true;
}
const value = await this.get(key);
return value !== undefined;
}
hasSync(key: string): boolean {
return this.memoryCache.has(key);
}
async unset(key?: string): Promise<boolean> {
if (this.memoryCache.size === 0) return false;
if (key && this.memoryCache.delete(key)) {
this.channel.postMessage({ action: "unset", key, value: undefined }); // Notify other instances to remove key
await this.execute("readwrite", (store) => store.delete(key));
return true;
}
this.memoryCache.clear();
this.channel.postMessage({ action: "clear", key: undefined, value: undefined }); // Notify other instances to clear keys
await this.execute("readwrite", (store) => store.clear());
return true;
}
unsetSync(key?: string): boolean {
if (this.memoryCache.size === 0) return false;
if (key) {
if (this.memoryCache.delete(key)) {
this.channel.postMessage({ action: "unset", key, value: undefined });
// this.executeQueue("readwrite", (store) => store.delete(key));
this.execute("readwrite", (store) => store.delete(key));
return true;
}
return false;
}
this.memoryCache.clear();
this.channel.postMessage({ action: "clear", key: undefined, value: undefined });
// this.executeQueue("readwrite", (store) => store.clear());
this.execute("readwrite", (store) => store.clear());
return true;
}
get length(): number {
return this.memoryCache.size;
}
get bytes(): number {
if (this.memoryCache.size === 0) return 0;
// return [...this.memoryCache.values()].reduce((acc, value) => acc + JSON.stringify(value).length, 0);
let totalSize = 0;
for (const [key, value] of this.memoryCache.entries()) {
totalSize += new TextEncoder().encode(key).length;
totalSize += new TextEncoder().encode(JSON.stringify(value)).length;
}
return totalSize;
}
get type(): StorageEngine {
return StorageEngine.IndexedDB;
}
}
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