Spring Boot Steps to implement real-time inventory management using observer mode

In modern software development, real-time data processing and responsive programming are becoming increasingly important. Inventory management systems are a typical application scenario that requires real-time updates. When inventory changes, the system should be able to notify all relevant components or services immediately. In this practical tutorial, we will show how to use Spring Boot in conjunction with observer mode to build a simple real-time inventory management system.

Technology stack

• Java 11
• Spring Boot
• Maven

Step 1: Create a Spring Boot Project

First, you need to create a new Spring Boot project. You can quickly generate a basic Spring Boot project through the Spring Initializr website or IDEA tools.

Step 2: Define the inventory entity class

We need to define an inventory entity class Inventory, which will store the basic information of the product and the inventory quantity.

java

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public class Inventory {
    private String productId;
    private int quantity;
    public Inventory(String productId, int quantity) {
         = productId;
         = quantity;
    }
    // getters and setters
}

Step 3: Implement the observer mode

Next, we need to implement the observer pattern. Here we define an InventoryObserver interface and a specific implementation class InventoryUpdateNotifier.

java

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// Observer interfacepublic interface InventoryObserver {
    void update(Inventory inventory);
}
// Specific observer implementationpublic class InventoryUpdateNotifier {
    private List<InventoryObserver> observers = new ArrayList<>();
    public void addObserver(InventoryObserver observer) {
        synchronized (observers) {
            if (!(observer)) {
                (observer);
            }
        }
    }
    public void removeObserver(InventoryObserver observer) {
        synchronized (observers) {
            (observer);
        }
    }
    public void notifyObservers(Inventory inventory) {
        for (InventoryObserver observer : observers) {
            (inventory);
        }
    }
}

Step 4: Integrate into Spring Framework

In order for these classes to be managed by Spring containers, we need to declare them as beans and set corresponding dependencies in the configuration file.

java

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@Configuration
public class AppConfig {
    @Bean
    public InventoryUpdateNotifier inventoryUpdateNotifier() {
        return new InventoryUpdateNotifier();
    }
}

Step 5: Create a service endpoint to update inventory

Now we need to create a RESTful API endpoint, which will trigger changes in inventory when called and notify all observers.

java

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@RestController
@RequestMapping("/inventory")
public class InventoryController {
    @Autowired
    private InventoryUpdateNotifier notifier;
    @PostMapping("/update")
    public ResponseEntity<String> update(@RequestBody Inventory inventory) {
        // Update inventory logic...        (inventory);
        return ("Inventory updated successfully");
    }
}

Step 6: Realize the observer

Finally, we need to create one or more observers that will subscribe to the inventory update event.

java

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@Component
public class StockMonitor implements InventoryObserver {
    @Override
    public void update(Inventory inventory) {
        ("Stock Monitor: Inventory of product " + () + " has been updated to " + ());
    }
}

Step 7: Test the application

Start your Spring Boot application and use Postman or curl commands to trigger the inventory update API, observe the console output, and confirm whether the observer is notified correctly.

shell

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curl -X POST http://localhost:8080/inventory/update -H 'Content-Type: application/json' -d '{"productId":"123", "quantity":5}'

The above is the implementation process of a simple real-time inventory management system implemented using Spring Boot combined with observer mode. Of course, in the actual production environment, more details need to be considered, such as transaction management, concurrent processing, etc.

This is the end of this article about Spring Boot using the observer mode to achieve real-time inventory management. For more relevant Spring Boot real-time inventory management content, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!