Gambaran Umum Microservices NestJS
Siapkan microservices NestJS menggunakan berbagai pengangkut seperti TCP, Redis, dan RabbitMQ, serta pahami konsep intinya.
Gambaran Umum Microservices NestJS adalah pelajaran NestJS Enterprise Backend APIs gratis di CoddyKit. Ini adalah pelajaran 1 dari 3. Kamu bisa membaca pelajaran lengkapnya di bawah secara gratis — lalu praktikkan langsung di browser dengan editor kode bawaan dan tutor AI 24/7. Ini adalah bagian dari jalur belajar NestJS Enterprise Backend APIs, dan progresmu tersinkronisasi di web dan aplikasi CoddyKit. Kursus NestJS Enterprise Backend APIs mencakup 3 pelajaran total.
Bagian dari pelajaran ini belum diterjemahkan dan ditampilkan dalam bahasa Inggris.
Intro to NestJS Microservices
Welcome to the world of NestJS Microservices! In this lesson, we'll explore how NestJS helps you build small, independent services that communicate with each other.
Microservices are an architectural style where applications are built as a collection of loosely coupled services. NestJS provides powerful tools to make this easier.
Why Use Microservices?
Adopting a microservice architecture offers several key advantages:
- Scalability: Individual services can be scaled independently based on their load.
- Resilience: Failure in one service is less likely to bring down the entire application.
- Independent Deployment: Services can be developed, deployed, and updated without affecting others.
- Technology Diversity: Different services can use different technologies if needed.
Core Concepts: Client & Server
In a microservice setup, we typically have:
- Microservice Server: This is the actual microservice that listens for incoming messages and processes them.
- Microservice Client: This is any other application or service that wants to communicate with the microservice server. It sends messages and receives responses.
They work together to perform distributed tasks.
Transporters: The Communication Bridge
How do microservice clients and servers communicate? They use transporters. A transporter is the underlying communication protocol or mechanism.
NestJS supports various transporters out of the box:
- TCP: For direct, point-to-point communication.
- Redis: A popular in-memory data store, often used as a message broker.
- RabbitMQ/NATS/Kafka: Robust message queue systems for advanced scenarios.
Setting Up a TCP Microservice Server
Let's create a basic NestJS microservice server using the TCP transporter. This server will listen for messages on a specific port.
import { NestFactory } from '@nestjs/core';
import { MicroserviceOptions, Transport } from '@nestjs/microservices';
import { AppModule } from './app.module';
async function bootstrap() {
const app = await NestFactory.createMicroservice<MicroserviceOptions>(
AppModule,
{
transport: Transport.TCP,
options: {
host: '127.0.0.1',
port: 8888,
},
},
);
await app.listen();
console.log('TCP Microservice is listening on port 8888');
}
bootstrap();Defining Message Handlers
On the server side, we define message handlers using the @MessagePattern() decorator. This tells NestJS which method should handle a specific message pattern.
Here, we define a handler for a 'sum' command that adds numbers.
import { Controller } from '@nestjs/common';
import { MessagePattern } from '@nestjs/microservices';
@Controller()
export class AppController {
@MessagePattern({ cmd: 'sum' })
accumulate(data: number[]): number {
console.log('Server received sum request:', data);
return (data || []).reduce((a, b) => a + b, 0);
}
}Setting Up a TCP Microservice Client
Now, let's create a client application that can send messages to our TCP microservice server. We use ClientProxyFactory to create a client instance.
import { NestFactory } from '@nestjs/core';
import { ClientProxyFactory, Transport } from '@nestjs/microservices';
import { INestApplicationContext } from '@nestjs/common';
async function bootstrap() {
const app: INestApplicationContext = await NestFactory.createApplicationContext({});
const client = ClientProxyFactory.create({
transport: Transport.TCP,
options: {
host: '127.0.0.1',
port: 8888,
},
});
const pattern = { cmd: 'sum' };
const payload = [1, 2, 3, 4];
console.log('Client sending message to microservice...');
const result = await client.send(pattern, payload).toPromise();
console.log('Microservice response:', result);
await app.close();
}
bootstrap();Request-Response Pattern: send()
The client.send() method is used for a request-response communication pattern. This means the client sends a message and expects a reply from the microservice server.
It returns an Observable, so we typically use .toPromise() to await the response in an async function.
client.send({ cmd: 'sum' }, [1, 2, 3]).toPromise()Event-Based Pattern: emit()
For event-based communication, where you don't necessarily need a direct response, you can use the client.emit() method.
This is useful for 'fire-and-forget' scenarios like sending notifications or logging events. The client sends the event and continues without waiting for a reply.
client.emit({ cmd: 'user_created' }, { userId: 42, name: 'Alice' });
console.log('User created event emitted.');Quick Check: Microservice Fundamentals
Which of the following statements are TRUE about NestJS microservices and their components?
Recap: Microservices Overview
Fantastic job! You've taken your first steps into NestJS microservices. We covered:
- The benefits of microservices for scalability and resilience.
- Core concepts: microservice clients, servers, and transporters.
- How to set up basic TCP microservice servers and clients.
- The difference between request-response (
send()) and event-based (emit()) communication patterns.
In upcoming lessons, we'll dive deeper into specific transporters like Redis and RabbitMQ!
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Pertanyaan yang Sering Diajukan
Apakah pelajaran “Gambaran Umum Microservices NestJS” gratis?
Ya — teks lengkap “Gambaran Umum Microservices NestJS” gratis dibaca di sini di web. Untuk praktiknya secara interaktif (editor kode bawaan dan tutor AI 24/7) dan buka sisa kursus NestJS Enterprise Backend APIs, upgrade ke CoddyKit PRO. Kursus NestJS Enterprise Backend APIs mencakup 3 pelajaran total.
Apa yang akan aku pelajari di “Gambaran Umum Microservices NestJS”?
Siapkan microservices NestJS menggunakan berbagai pengangkut seperti TCP, Redis, dan RabbitMQ, serta pahami konsep intinya. Kamu berlatih NestJS Enterprise Backend APIs dengan kode praktik yang langsung kamu jalankan di browser, dan tutor AI 24/7 menjawab pertanyaanmu saat kamu mengerjakan pelajaran ini.
Apakah aku perlu pengalaman untuk memulai NestJS Enterprise Backend APIs?
Tidak diperlukan pengalaman sebelumnya. NestJS Enterprise Backend APIs di CoddyKit dirancang untuk pemula hingga pelajar tingkat lanjut, jadi kamu bisa memulai di sini atau dari awal dan belajar sesuai kecepatan kamu sendiri. Ini adalah pelajaran 1 dari 3.
Berapa lama pelajaran “Gambaran Umum Microservices NestJS” memakan waktu?
Sebagian besar pelajaran CoddyKit memakan waktu sekitar 5–10 menit. Setiap pelajaran ringkas dan interaktif, jadi kamu membuat kemajuan stabil dan melanjutkan dari tempat kamu tinggalkan di web dan aplikasi.
Bisakah aku menulis dan menjalankan kode dalam pelajaran NestJS Enterprise Backend APIs ini?
Ya. Setiap pelajaran NestJS Enterprise Backend APIs menyertakan editor kode bawaan, jadi kamu menulis dan menjalankan kode nyata langsung di browser dan mendapatkan umpan balik AI instan — tidak diperlukan penyiapan lokal.
Semua pelajaran dalam kursus ini
- Gambaran Umum Microservices NestJS
- Integrasi RabbitMQ
- Komunikasi Antar-Layanan