@electric-sql/d2mini/dist/d2.js

D2Mini is a minimal implementation of Differential Dataflow for performing in-memory incremental view maintenance.

import { DifferenceStreamWriter, } from './graph.js';
export class D2 {
    #streams = [];
    #operators = [];
    #nextOperatorId = 0;
    #finalized = false;
    constructor() { }
    #checkNotFinalized() {
        if (this.#finalized) {
            throw new Error('Graph already finalized');
        }
    }
    getNextOperatorId() {
        this.#checkNotFinalized();
        return this.#nextOperatorId++;
    }
    newInput() {
        this.#checkNotFinalized();
        const writer = new DifferenceStreamWriter();
        // Use the root stream builder that exposes the sendData and sendFrontier methods
        const streamBuilder = new RootStreamBuilder(this, writer);
        this.#streams.push(streamBuilder.connectReader());
        return streamBuilder;
    }
    addOperator(operator) {
        this.#checkNotFinalized();
        this.#operators.push(operator);
    }
    addStream(stream) {
        this.#checkNotFinalized();
        this.#streams.push(stream);
    }
    finalize() {
        this.#checkNotFinalized();
        this.#finalized = true;
    }
    step() {
        if (!this.#finalized) {
            throw new Error('Graph not finalized');
        }
        for (const op of this.#operators) {
            op.run();
        }
    }
    pendingWork() {
        return this.#operators.some((op) => op.hasPendingWork());
    }
    run() {
        while (this.pendingWork()) {
            this.step();
        }
    }
}
export class StreamBuilder {
    #graph;
    #writer;
    constructor(graph, writer) {
        this.#graph = graph;
        this.#writer = writer;
    }
    connectReader() {
        return this.#writer.newReader();
    }
    get writer() {
        return this.#writer;
    }
    get graph() {
        return this.#graph;
    }
    pipe(...operators) {
        return operators.reduce((stream, operator) => {
            return operator(stream);
        }, this);
    }
}
export class RootStreamBuilder extends StreamBuilder {
    sendData(collection) {
        this.writer.sendData(collection);
    }
}
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