@worker-tools/deno-kv-storage
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An implementation of the StorageArea (1,2,3) interface for Deno with an extensible system for supporting various database backends.
129 lines • 7.68 kB
JavaScript
var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, state, value, kind, f) {
if (kind === "m") throw new TypeError("Private method is not writable");
if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a setter");
if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot write private member to an object whose class did not declare it");
return (kind === "a" ? f.call(receiver, value) : f ? f.value = value : state.set(receiver, value)), value;
};
var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (receiver, state, kind, f) {
if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a getter");
if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot read private member from an object whose class did not declare it");
return kind === "m" ? f : kind === "a" ? f.call(receiver) : f ? f.value : state.get(receiver);
};
var _DeferredStack_array, _DeferredStack_creator, _DeferredStack_max_size, _DeferredStack_queue, _DeferredStack_size, _DeferredAccessStack_elements, _DeferredAccessStack_initializeElement, _DeferredAccessStack_checkElementInitialization, _DeferredAccessStack_queue, _DeferredAccessStack_size;
import { deferred } from "../deps.js";
export class DeferredStack {
constructor(max, ls, creator) {
_DeferredStack_array.set(this, void 0);
_DeferredStack_creator.set(this, void 0);
_DeferredStack_max_size.set(this, void 0);
_DeferredStack_queue.set(this, void 0);
_DeferredStack_size.set(this, void 0);
__classPrivateFieldSet(this, _DeferredStack_array, ls ? [...ls] : [], "f");
__classPrivateFieldSet(this, _DeferredStack_creator, creator, "f");
__classPrivateFieldSet(this, _DeferredStack_max_size, max || 10, "f");
__classPrivateFieldSet(this, _DeferredStack_queue, [], "f");
__classPrivateFieldSet(this, _DeferredStack_size, __classPrivateFieldGet(this, _DeferredStack_array, "f").length, "f");
}
get available() {
return __classPrivateFieldGet(this, _DeferredStack_array, "f").length;
}
async pop() {
var _a;
if (__classPrivateFieldGet(this, _DeferredStack_array, "f").length > 0) {
return __classPrivateFieldGet(this, _DeferredStack_array, "f").pop();
}
else if (__classPrivateFieldGet(this, _DeferredStack_size, "f") < __classPrivateFieldGet(this, _DeferredStack_max_size, "f") && __classPrivateFieldGet(this, _DeferredStack_creator, "f")) {
__classPrivateFieldSet(this, _DeferredStack_size, (_a = __classPrivateFieldGet(this, _DeferredStack_size, "f"), _a++, _a), "f");
return await __classPrivateFieldGet(this, _DeferredStack_creator, "f").call(this);
}
const d = deferred();
__classPrivateFieldGet(this, _DeferredStack_queue, "f").push(d);
await d;
return __classPrivateFieldGet(this, _DeferredStack_array, "f").pop();
}
push(value) {
__classPrivateFieldGet(this, _DeferredStack_array, "f").push(value);
if (__classPrivateFieldGet(this, _DeferredStack_queue, "f").length > 0) {
const d = __classPrivateFieldGet(this, _DeferredStack_queue, "f").shift();
d.resolve();
}
}
get size() {
return __classPrivateFieldGet(this, _DeferredStack_size, "f");
}
}
_DeferredStack_array = new WeakMap(), _DeferredStack_creator = new WeakMap(), _DeferredStack_max_size = new WeakMap(), _DeferredStack_queue = new WeakMap(), _DeferredStack_size = new WeakMap();
/**
* The DeferredAccessStack provides access to a series of elements provided on the stack creation,
* but with the caveat that they require an initialization of sorts before they can be used
*
* Instead of providing a `creator` function as you would with the `DeferredStack`, you provide
* an initialization callback to execute for each element that is retrieved from the stack and a check
* callback to determine if the element requires initialization and return a count of the initialized
* elements
*/
export class DeferredAccessStack {
/**
* @param initialize This function will execute for each element that hasn't been initialized when requested from the stack
*/
constructor(elements, initCallback, checkInitCallback) {
_DeferredAccessStack_elements.set(this, void 0);
_DeferredAccessStack_initializeElement.set(this, void 0);
_DeferredAccessStack_checkElementInitialization.set(this, void 0);
_DeferredAccessStack_queue.set(this, void 0);
_DeferredAccessStack_size.set(this, void 0);
__classPrivateFieldSet(this, _DeferredAccessStack_checkElementInitialization, checkInitCallback, "f");
__classPrivateFieldSet(this, _DeferredAccessStack_elements, elements, "f");
__classPrivateFieldSet(this, _DeferredAccessStack_initializeElement, initCallback, "f");
__classPrivateFieldSet(this, _DeferredAccessStack_queue, [], "f");
__classPrivateFieldSet(this, _DeferredAccessStack_size, elements.length, "f");
}
get available() {
return __classPrivateFieldGet(this, _DeferredAccessStack_elements, "f").length;
}
/**
* The max number of elements that can be contained in the stack a time
*/
get size() {
return __classPrivateFieldGet(this, _DeferredAccessStack_size, "f");
}
/**
* Will execute the check for initialization on each element of the stack
* and then return the number of initialized elements that pass the check
*/
async initialized() {
const initialized = await Promise.all(__classPrivateFieldGet(this, _DeferredAccessStack_elements, "f").map((e) => __classPrivateFieldGet(this, _DeferredAccessStack_checkElementInitialization, "f").call(this, e)));
return initialized
.filter((initialized) => initialized === true)
.length;
}
async pop() {
let element;
if (this.available > 0) {
element = __classPrivateFieldGet(this, _DeferredAccessStack_elements, "f").pop();
}
else {
// If there are not elements left in the stack, it will await the call until
// at least one is restored and then return it
const d = deferred();
__classPrivateFieldGet(this, _DeferredAccessStack_queue, "f").push(d);
await d;
element = __classPrivateFieldGet(this, _DeferredAccessStack_elements, "f").pop();
}
if (!await __classPrivateFieldGet(this, _DeferredAccessStack_checkElementInitialization, "f").call(this, element)) {
await __classPrivateFieldGet(this, _DeferredAccessStack_initializeElement, "f").call(this, element);
}
return element;
}
push(value) {
__classPrivateFieldGet(this, _DeferredAccessStack_elements, "f").push(value);
// If an element has been requested while the stack was empty, indicate
// that an element has been restored
if (__classPrivateFieldGet(this, _DeferredAccessStack_queue, "f").length > 0) {
const d = __classPrivateFieldGet(this, _DeferredAccessStack_queue, "f").shift();
d.resolve();
}
}
}
_DeferredAccessStack_elements = new WeakMap(), _DeferredAccessStack_initializeElement = new WeakMap(), _DeferredAccessStack_checkElementInitialization = new WeakMap(), _DeferredAccessStack_queue = new WeakMap(), _DeferredAccessStack_size = new WeakMap();
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