111 lines
2.8 KiB
JavaScript
111 lines
2.8 KiB
JavaScript
var memoizer = require('./..');
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var assert = require('chai').assert;
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describe('lru-memoizer (queueMaxAge)', function () {
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var loadTimes = 0, memoized;
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beforeEach(function () {
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loadTimes = 0;
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});
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function observer() {
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const listeners = [];
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return {
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listen(listener) {
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listeners.push(listener);
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},
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trigger() {
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listeners.forEach(listener => listener());
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}
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}
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}
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it('should create a new queue once expired', function (done) {
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memoized = memoizer({
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load: function (a, b, onResolve, callback) {
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loadTimes++;
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onResolve(() => callback(null, a + b));
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},
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queueMaxAge: 10,
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hash: function (a, b) {
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return a + '-' + b;
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}
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});
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const observer1 = observer();
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const observer2 = observer();
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const observer3 = observer();
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const resolved = [];
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memoized(1, 2, observer1.listen, function (err, result) {
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assert.isNull(err);
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assert.strictEqual(result, 3);
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resolved.push('A');
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});
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assert.strictEqual(loadTimes, 1);
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memoized(1, 2, assert.fail, function (err, result) {
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assert.isNull(err);
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assert.strictEqual(result, 3);
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resolved.push('B');
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});
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assert.strictEqual(loadTimes, 1);
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setTimeout(() => {
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// previous queue expired, this calls will be added to a new queue.
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memoized(1, 2, observer2.listen, function (err, result) {
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assert.isNull(err);
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assert.strictEqual(result, 3);
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resolved.push('C');
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});
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memoized(1, 2, assert.fail, function (err, result) {
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assert.isNull(err);
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assert.strictEqual(result, 3);
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resolved.push('D');
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});
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// only one new invocation to load
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assert.strictEqual(loadTimes, 2);
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setTimeout(() => {
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// second queue expired, this calls will be added to a third queue.
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memoized(1, 2, observer3.listen, function (err, result) {
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assert.isNull(err);
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assert.strictEqual(result, 3);
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resolved.push('E');
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});
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memoized(1, 2, assert.fail.listen, function (err, result) {
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assert.isNull(err);
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assert.strictEqual(result, 3);
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resolved.push('F');
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});
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assert.strictEqual(loadTimes, 3);
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observer1.trigger();
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setImmediate(() => {
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// first queue was resolved
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assert.deepEqual(['A', 'B'], resolved);
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observer3.trigger();
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setImmediate(() => {
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// third queue was resolved
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assert.deepEqual(['A', 'B', 'E', 'F'], resolved);
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observer2.trigger();
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setImmediate(() => {
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// second queue was resolved
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assert.deepEqual(['A', 'B', 'E', 'F', 'C', 'D'], resolved);
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done();
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});
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});
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});
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}, 100);
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}, 100);
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});
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});
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