@electric-sql/d2ts/dist/operators/base.js

D2TS is a TypeScript implementation of Differential Dataflow.

import { MessageType } from '../types.js';
import { UnaryOperator } from '../graph.js';
/**
 * Base class for operators that process a single input stream
 */
export class LinearUnaryOperator extends UnaryOperator {
    run() {
        for (const message of this.inputMessages()) {
            if (message.type === MessageType.DATA) {
                const { version, collection } = message.data;
                this.output.sendData(version, this.inner(collection));
            }
            else if (message.type === MessageType.FRONTIER) {
                const frontier = message.data;
                if (!this.inputFrontier().lessEqual(frontier)) {
                    throw new Error('Invalid frontier update');
                }
                this.setInputFrontier(frontier);
            }
        }
        if (!this.outputFrontier.lessEqual(this.inputFrontier())) {
            throw new Error('Invalid frontier state');
        }
        if (this.outputFrontier.lessThan(this.inputFrontier())) {
            this.outputFrontier = this.inputFrontier();
            this.output.sendFrontier(this.outputFrontier);
        }
    }
}
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