@electric-sql/d2mini/dist/operators/consolidate.js

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

import { DifferenceStreamWriter, UnaryOperator } from '../graph.js';
import { StreamBuilder } from '../d2.js';
import { MultiSet } from '../multiset.js';
/**
 * Operator that consolidates collections
 */
export class ConsolidateOperator extends UnaryOperator {
    run() {
        const messages = this.inputMessages();
        if (messages.length === 0) {
            return;
        }
        // Combine all messages into a single MultiSet
        const combined = new MultiSet();
        for (const message of messages) {
            combined.extend(message);
        }
        // Consolidate the combined MultiSet
        const consolidated = combined.consolidate();
        // Only send if there are results
        if (consolidated.getInner().length > 0) {
            this.output.sendData(consolidated);
        }
    }
}
/**
 * Consolidates the elements in the stream
 */
export function consolidate() {
    return (stream) => {
        const output = new StreamBuilder(stream.graph, new DifferenceStreamWriter());
        const operator = new ConsolidateOperator(stream.graph.getNextOperatorId(), stream.connectReader(), output.writer);
        stream.graph.addOperator(operator);
        stream.graph.addStream(output.connectReader());
        return output;
    };
}
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