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They implement outbound ports to connect to infrastructure. Examples include Spring Data JPA repositories, AWS S3 clients, or external SMTP mail servers. 4. Hands-On Java Implementation: An Order Management System

package com.example.orders.domain.model; import java.math.BigDecimal; import java.util.UUID; public class Order private final UUID id; private final String product; private final BigDecimal price; private String status; public Order(UUID id, String product, BigDecimal price, String status) this.id = id; this.product = product; this.price = price; this.status = status; public void complete() if ("CANCELLED".equals(this.status)) throw new IllegalStateException("Cannot complete a cancelled order"); this.status = "COMPLETED"; // Getters public UUID getId() return id; public String getProduct() return product; public BigDecimal getPrice() return price; public String getStatus() return status; Use code with caution. 3. Defining the Ports They implement outbound ports to connect to infrastructure

: If you have already purchased a physical copy or a Kindle version, Packt provides a DRM-free PDF at no extra cost Source Code private final String product