@graphistry/falcor/test/set/jsonGraphs/expired.spec.js

A JavaScript library for efficient data fetching.

var $ref = require('@graphistry/falcor-json-graph').ref;
var strip = require('../support/strip');
var $atom = require('@graphistry/falcor-json-graph').atom;
var $pathValue = require('@graphistry/falcor-json-graph').pathValue;
var $jsonGraph = require('../support/jsonGraph');
var $jsonGraphEnvelope = require('../support/jsonGraphEnvelope');

var expect = require('chai').expect;
var getModel = require('../support/getModel');
var setJSONGraphs = require('../../../lib/cache/set/setJSONGraphs');

describe('an expired value', function() {

    it('converts a negative $expires value to an absolute time', function() {

        var cache = {};
        var version = 0;

        setJSONGraphs(
            getModel({ cache: cache, version: version++ }), [
            $jsonGraphEnvelope([
                $pathValue('grid', $ref('grids["id"]')),
                $pathValue('grids["id"][0]', $ref('lists["id"]', {
                    $expires: -1000
                }))
            ])]
        );

        var value = cache.grids.id[0];
        var expires = value.$expires;

        expect(expires > Date.now()).to.be.true;
        expect(strip(cache)).to.deep.equal(strip({
            grid: $ref('grids["id"]'),
            grids: { id: { 0: $ref('lists["id"]') } }
        }));
    });

    it('sets through an immediately expired reference', function() {

        var cache = {};
        var version = 0;
        var expired = [];

        setJSONGraphs(
            getModel({ cache: cache, expired: expired, version: version++ }), [{
                paths: [['grid', 0, 0, 'title']],
                jsonGraph: $jsonGraph([
                    $pathValue('grid', $ref('grids["id"]')),
                    $pathValue('grids["id"][0]', $ref('lists["id"]', {
                        $expires: 0
                    })),
                    $pathValue('lists["id"][0]', $ref('movies["pulp-fiction"]')),
                    $pathValue('movies["pulp-fiction"].title', 'Pulp Fiction')
                ])
            }], null, null, false);

        expect(expired.length).to.equal(1);
        expect(strip(cache)).to.deep.equal(strip({
            grid: $ref('grids["id"]'),
            grids: { id: { 0: $ref('lists["id"]') } },
            lists: { id: { 0: $ref('movies["pulp-fiction"]') } },
            movies: {
                "pulp-fiction": {
                    'title': $atom('Pulp Fiction')
                }
            }
        }));
    });

    it('short-circuits writing an already expired reference', function() {

        var startTime = Date.now();
        var cache = {};
        var version = 0;
        var expired = [];

        setJSONGraphs(
            getModel({ cache: cache, expired: expired, version: version++ }), [{
                paths: [['grid', 0, 0, 'title']],
                jsonGraph: $jsonGraph([
                    $pathValue('grid', $ref('grids["id"]')),
                    $pathValue('grids["id"][0]', $ref('lists["id"]', {
                        $expires: startTime - 10
                    })),
                    $pathValue('lists["id"][0]', $ref('movies["pulp-fiction"]')),
                    $pathValue('movies["pulp-fiction"].title', 'Pulp Fiction')
                ])
            }]
        );

        expect(expired.length).to.equal(1);
        expect(strip(cache)).to.deep.equal(strip({
            grid: $ref('grids["id"]'),
            grids: { id: { 0: $ref('lists["id"]') } }
        }));
    });

    it('short-circuits writing past an expired reference', function(done) {

        var lru = new Object();
        var cache = {};
        var version = 0;
        var expired = [];
        var startTime = Date.now();

        setJSONGraphs(
            getModel({ lru: lru, cache: cache, expired: expired, version: version++ }), [{
                paths: [['grid', 0, 0, 'title']],
                jsonGraph: $jsonGraph([
                    $pathValue('grid', $ref('grids["id"]')),
                    $pathValue('grids["id"][0]', $ref('lists["id"]', {
                        $expires: -5
                    })),
                    $pathValue('lists["id"][0]', $ref('movies["pulp-fiction"]')),
                    $pathValue('movies["pulp-fiction"].title', 'Pulp Fiction')
                ])
            }]
        );

        setTimeout(function() {
            var errored = false;
            try {
                var successfulPaths = setJSONGraphs(
                    getModel({ lru: lru, cache: cache, expired: expired, version: version++ }), [{
                        paths: [['grid', 0, 0, 'director']],
                        jsonGraph: $jsonGraph([
                            $pathValue('movies["pulp-fiction"].director', 'Quentin Tarantino')
                        ])
                    }]
                );

                expect(successfulPaths[1].length).to.equal(0);
                expect(strip(cache)).to.deep.equal(strip({
                    grid: $ref('grids["id"]'),
                    grids: { id: { 0: $ref('lists["id"]') } },
                    lists: { id: { 0: $ref('movies["pulp-fiction"]') } },
                    movies: {
                        "pulp-fiction": {
                            'title': $atom('Pulp Fiction')
                        }
                    }
                }));
            } catch (e) {
                errored = true;
                done(e);
            } finally {
                if (!errored) {
                    done();
                }
            }
        }, 100);
    });
});