@microtica/database/js/chunked-query.js

Database tools

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.processInChunks = exports.getInChunks = void 0;
const Promise = require("bluebird");
const _ = require("lodash");
/**
 * Facilitates query-chunking by allowing you to process a list in chunks and aggregating the results.
 * For a version that does not expect results to be returned, use processInChunks.
 * @param values the values to process.
 * @param subsetCallback the callback to call for each subset of results.
 * Each subset is expected to produce a promise that resolves to a list of results.
 * @param [chunkSize] the chunk size. If not specified, will use a server-configured value.
 * @return {Promise<R[]>} returns a list of combined results from all chunks.
 */
function getInChunks(values, subsetCallback, chunkSize = 300) {
    if (values.length === 0) {
        return Promise.resolve([]);
    }
    return Promise.map(_.chunk(values, chunkSize), valueSubset => {
        return subsetCallback(valueSubset);
    }).then(chunks => _.flatten(chunks));
}
exports.getInChunks = getInChunks;
/**
 * Facilitates query-chunking by allowing you to process a list in chunks.
 * For a version that aggregates the return results, use getInChunks.
 * @param values the values to process.
 * @param subsetCallback the callback to call for each subset of results. Each subset is expected to produce a promise.
 * @param [chunkSize] the chunk size. If not specified, will use a server-configured value.
 */
function processInChunks(values, subsetCallback, chunkSize = 300) {
    if (values.length === 0) {
        return Promise.resolve();
    }
    return Promise.map(_.chunk(values, chunkSize), valueSubset => {
        return subsetCallback(valueSubset);
    }).return();
}
exports.processInChunks = processInChunks;
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