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

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

import { DifferenceStreamWriter } from '../graph.js';
import { StreamBuilder } from '../d2.js';
import { BinaryOperator } from '../graph.js';
/**
 * Operator that concatenates two input streams
 */
export class ConcatOperator extends BinaryOperator {
    run() {
        for (const message of this.inputAMessages()) {
            this.output.sendData(message);
        }
        for (const message of this.inputBMessages()) {
            this.output.sendData(message);
        }
    }
}
/**
 * Concatenates two input streams
 * @param other - The other stream to concatenate
 */
export function concat(other) {
    return (stream) => {
        if (stream.graph !== other.graph) {
            throw new Error('Cannot concat streams from different graphs');
        }
        const output = new StreamBuilder(stream.graph, new DifferenceStreamWriter());
        const operator = new ConcatOperator(stream.graph.getNextOperatorId(), stream.connectReader(), other.connectReader(), output.writer);
        stream.graph.addOperator(operator);
        stream.graph.addStream(output.connectReader());
        return output;
    };
}
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