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title

Service-oriented Architecture (SOA)

매 한 줄

"매 비즈니스 기능을 매 reusable, network-addressable service로 매 분해". 2000년대 enterprise integration의 매 dominant paradigm. SOAP/WS-* + ESB로 매 시작 → REST/event-driven으로 매 진화 → 매 microservices가 매 SOA의 매 fine-grained 후속. 2026년에도 매 large enterprise (banking, telecom)에 매 살아있음.

매 핵심

매 원칙

Service contract: 매 명시적 interface (WSDL, OpenAPI).
Loose coupling: 매 schema/protocol 만 의존.
Reusability: 매 같은 service 매 다중 consumer.
Composability: 매 service 합성으로 매 process 구성.
Discoverability: 매 registry (UDDI, Consul, k8s DNS).

매 vs Microservices

측면	SOA (classic)	Microservices
크기	매 coarse-grained (business domain)	매 fine-grained
Comm	ESB + SOAP	HTTP/gRPC/Event
Data	매 shared DB 가능	DB-per-service
Governance	매 central	매 decentralized

매 응용

매 banking core integration.
매 telecom OSS/BSS.
매 government legacy modernization (SOAP wrap).
매 hybrid cloud (on-prem ↔ cloud SOA bridge).

💻 패턴

매 SOAP service (Java JAX-WS)

@WebService
public class OrderService {
  @WebMethod
  public OrderResponse place(@WebParam OrderRequest req) {
    return new OrderResponse("ok", req.getId());
  }
}

매 WSDL contract (요약)

<wsdl:definitions targetNamespace="http://orders.example.com">
  <wsdl:portType name="OrderService">
    <wsdl:operation name="place">
      <wsdl:input message="tns:placeRequest"/>
      <wsdl:output message="tns:placeResponse"/>
    </wsdl:operation>
  </wsdl:portType>
</wsdl:definitions>

매 ESB routing (Camel)

from("activemq:queue:orders.in")
  .choice()
    .when(xpath("/order/total > 1000"))
      .to("activemq:queue:orders.high-value")
    .otherwise()
      .to("activemq:queue:orders.standard");

매 Modern REST SOA (OpenAPI)

openapi: 3.1.0
info: { title: Orders, version: 2.0 }
paths:
  /orders:
    post:
      requestBody:
        content:
          application/json:
            schema: { $ref: "#/components/schemas/OrderRequest" }
      responses:
        "201":
          content:
            application/json:
              schema: { $ref: "#/components/schemas/Order" }

매 Service registry — Consul

consul services register -name=orders -port=8080 -address=10.0.0.5
consul catalog services
# orders, billing, inventory

매 Saga (long-running process composition)

// 매 SOA business process orchestration
async function placeOrderSaga(order: Order) {
  await orderService.create(order);
  try {
    await paymentService.charge(order);
    await inventoryService.reserve(order);
    await shippingService.schedule(order);
  } catch (e) {
    await orderService.cancel(order.id); // 매 compensation
    throw e;
  }
}

매 BPMN/Camunda (process layer)

<bpmn:process id="OrderFulfillment">
  <bpmn:serviceTask id="charge" camunda:topic="payment-charge" />
  <bpmn:serviceTask id="reserve" camunda:topic="inventory-reserve" />
  <bpmn:serviceTask id="ship" camunda:topic="shipping-schedule" />
</bpmn:process>

매 결정 기준

상황	Approach
매 enterprise legacy 통합	SOA + ESB 매 정당.
매 cloud-native greenfield	Microservices 우선.
매 strict contract + governance	SOA + WSDL/OpenAPI.
매 high autonomy	Microservices + event-driven.
매 long-running biz process	SOA + BPM (Camunda).

기본값: 매 greenfield → microservices. 매 legacy integration → SOA.

🔗 Graph

부모: Distributed Systems
변형: Microservices · Event-Driven Architecture · ESB
응용: API Gateway · BPM
Adjacent: REST · Service Mesh · Bounded_Context

🤖 LLM 활용

언제: 매 enterprise 통합, 매 legacy modernization 설계, 매 BPM process 디자인. 언제 X: 매 small startup, 매 single-team product.

❌ 안티패턴

매 ESB 매 god-object: 매 모든 logic을 ESB로 → 매 maintenance hell.
매 service 가 매 DB 직접 공유: 매 loose coupling 깨짐.
매 WSDL 매 micro-version 폭발: 매 versioning 전략 부재.
매 SOA를 매 microservices로 매 단순 rebrand: 매 fine-grain 차이 무시.

🧪 검증 / 중복

Verified (Erl, SOA Principles of Service Design; Newman, Building Microservices).
신뢰도 A.

🕓 Changelog

날짜	변경
2026-05-08	Phase 1
2026-05-10	Manual cleanup — SOA classic + modern REST/SOA + microservices comparison

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