Code Explainers

Code explainers tagged #batching

rust 
use axum::{extract::State, response::IntoResponse, Json};
use serde::{Deserialize, Serialize};
use serde_json::{json, Value};
use std::sync::Arc;

Building a JSON-RPC 2.0 handler in Axum

json-rpc serde request-dispatch
Intermediate 8 steps
javascript 
async function uploadInBatches(records, uploadFn, { batchSize = 100, concurrency = 3 } = {}) {
  const batches = [];
  for (let i = 0; i < records.length; i += batchSize) {
    batches.push(records.slice(i, i + batchSize));

Uploading records with bounded concurrency

concurrency worker-pool async-await
Advanced 8 steps
go 
package batch
 
import "fmt"
 

Splitting a slice into batches in Go

generics slices error-handling
Intermediate 6 steps
ruby 
class Debouncer
  def initialize(delay:)
    @delay = delay
    @mutex = Mutex.new

A thread-safe debouncer in Ruby

concurrency debouncing mutex
Advanced 5 steps
ruby 
class Admin::OrdersExportController < Admin::BaseController
  include ActionController::Live
 
  def show

Streaming a CSV export in Rails

streaming csv-export batching
Advanced 8 steps
javascript 
const MAX_BATCH_SIZE = 20;
const FLUSH_INTERVAL = 5000;
const ENDPOINT = '/api/analytics';
 

Batching analytics events in the browser

batching buffering sendbeacon
Intermediate 10 steps
java 
@Controller
public class BookController {
 
    private final BookService bookService;

Solving GraphQL N+1 with batch mapping in Spring

graphql n+1-problem batching
Intermediate 8 steps
go 
func (r *EventRepository) BatchInsert(ctx context.Context, events []Event) error {
	if len(events) == 0 {
		return nil
	}

Batch inserting rows in a Go transaction

transactions batching database
Intermediate 7 steps
go 
type SensorReading struct {
	DeviceID    string    `json:"device_id" binding:"required"`
	Temperature float64   `json:"temperature"`
	RecordedAt  time.Time `json:"recorded_at" binding:"required"`

Streaming NDJSON ingestion in Gin

streaming batching json-decoding
Advanced 10 steps
ruby 
class BulkImporter
  BATCH_SIZE = 500
 
  def initialize(records)

Batching bulk inserts in Rails

batching bulk-insert deduplication
Intermediate 5 steps
java 
public class OrderRepository {
 
    private static final int BATCH_SIZE = 500;
    private static final String INSERT_SQL =

Batched JDBC inserts with transaction safety

jdbc batching transactions
Intermediate 8 steps
java 
@Component
@Order(20)
public class ProductSearchIndexRunner implements ApplicationRunner {
 

Rebuilding a search index at Spring startup

startup-hook batching streaming
Intermediate 8 steps
typescript 
type Event = Record<string, unknown>;
 
interface BatcherOptions {
  endpoint: string;

Batching analytics events in TypeScript

batching buffering async
Intermediate 8 steps
javascript 
class DOMBatcher {
  constructor() {
    this.reads = [];
    this.writes = [];

Batching DOM reads and writes to avoid layout thrash

batching requestanimationframe layout-thrashing
Intermediate 8 steps
php 
final class UserActivityStream
{
    public function __construct(
        private readonly \PDO $db,

Streaming user activity with PHP generators

generators pagination lazy-evaluation
Intermediate 8 steps
rust 
use std::collections::HashMap;
 
#[derive(Debug, Clone)]
struct Record {

Batched aggregation with fold in Rust

iterators fold hashmap
Intermediate 9 steps
ruby 
class PurgeStaleExportsJob < ApplicationJob
  queue_as :maintenance
 
  retry_on ActiveRecord::Deadlocked, wait: :polynomially_longer, attempts: 5

Purging stale exports with an Active Job in Rails

background-jobs batching error-handling
Intermediate 7 steps
php 
public function importUsers(array $users): int
{
    $inserted = 0;
 

Bulk-inserting users with batched PDO upserts

batching bulk-insert prepared-statements
Intermediate 6 steps