124 lines
3.4 KiB
TypeScript
124 lines
3.4 KiB
TypeScript
import Debug from 'debug';
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import { PointerTarget } from "@src/core/delta";
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import { Hyperview, HyperviewViewOne } from "@src/views/hyperview";
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import { Lossy } from "@src/views/view";
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import { RhizomeNode } from "@src/node";
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import { valueFromDelta } from "@src/views/hyperview";
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import { latestFromCollapsedDeltas } from "@src/views/resolvers/timestamp-resolvers";
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import { createDelta } from "@src/core/delta-builder";
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const debug = Debug('rz:test:view');
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type Role = {
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actor: PointerTarget,
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film: PointerTarget,
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role: PointerTarget
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};
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type Summary = {
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roles: Role[];
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};
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class Summarizer extends Lossy<Summary> {
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private readonly debug: debug.Debugger;
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constructor(hyperview: Hyperview) {
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super(hyperview);
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this.debug = Debug('rz:test:view:summarizer');
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}
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initializer(): Summary {
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this.debug('Initializing new summary');
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return {
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roles: []
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};
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}
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// TODO: Add more rigor to this example approach to generating a summary.
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// it's really not CRDT, it likely depends on the order of the pointers.
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// TODO: Prove with failing test
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reducer(acc: Summary, cur: HyperviewViewOne): Summary {
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this.debug(`Processing view for entity ${cur.id} (referenced as: ${cur.referencedAs?.join(', ')})`);
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this.debug(`hyperview:`, JSON.stringify(cur));
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if (cur.referencedAs?.includes("role")) {
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this.debug(`Found role entity: ${cur.id}`);
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const actorDeltas = cur.propertyDeltas["actor"];
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this.debug(`Found ${actorDeltas?.length ?? 0} actor deltas`);
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const {delta, value: actor} = latestFromCollapsedDeltas("actor", actorDeltas) ?? {};
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if (!delta) {
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this.debug('No delta found for actor property');
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throw new Error('expected to find delta');
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}
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if (!actor) {
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this.debug('No actor value found in deltas');
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throw new Error('expected to find actor');
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}
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this.debug(`Found actor: ${actor}`);
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const film = valueFromDelta("film", delta);
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if (!film) {
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this.debug('No film property found in delta');
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throw new Error('expected to find film');
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}
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this.debug(`Found film: ${film}`);
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const role = {
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role: cur.id,
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actor,
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film
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};
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acc.roles.push(role);
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this.debug(`Added role: ${JSON.stringify(role)}`);
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}
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this.debug(`Updated accumulator: ${JSON.stringify(acc, null, 2)}`);
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return acc;
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}
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resolver(acc: Summary): Summary {
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this.debug(`Resolving summary with ${acc.roles.length} roles`);
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return acc;
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}
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}
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describe('Lossy', () => {
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describe('use a provided initializer, reducer, and resolver to resolve entity views', () => {
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const node = new RhizomeNode();
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const hyperview = new Hyperview(node);
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const view = new Summarizer(hyperview);
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beforeAll(() => {
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hyperview.ingestDelta(createDelta('a', 'h')
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.addPointer('actor', 'keanu', 'roles')
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.addPointer('role', 'neo', 'actor')
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.addPointer('film', 'the_matrix', 'cast')
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.addPointer('base_salary', 1000000)
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.addPointer('salary_currency', 'usd')
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.buildV1()
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);
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});
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test('example summary', () => {
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const result = view.resolve();
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debug('result', result);
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expect(result).toEqual({
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roles: [{
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film: "the_matrix",
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role: "neo",
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actor: "keanu"
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}]
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});
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});
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});
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});
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