Example of Jobs in Sales Management App

1. Automated Alerts:

   • Job: Send an alert when stock is low.
   • Batch Process: Checks inventory levels at regular intervals and sends alerts via email or SMS when stock levels fall below a specified threshold.

2. Stock Updates:

   • Job: Automatically update stock levels when orders are made.
   • Batch Process: After an order is processed, the stock quantity is automatically updated, reducing the inventory based on the items purchased.

3. Order Processing:

   • Job: Process customer orders and update inventory.
   • Batch Process: Manages the entire process of receiving, validating, and processing customer orders, ensuring stock levels are updated accordingly.

4. Daily Sales Report:

   • Job: Generate a daily sales report.
   • Batch Process: Collects data on all sales transactions for the day, aggregates totals, and produces a formatted sales report for management.

5. Customer Invoicing:

   • Job: Generate invoices for completed orders.
   • Batch Process: Automatically generates invoices for customers after their orders are confirmed and processed.

6. Price Updates:

   • Job: Update product prices based on certain criteria (e.g., cost price changes or promotional offers).
   • Batch Process: Periodically checks for price updates and applies changes to product listings.

7. Inventory Replenishment:

   • Job: Automatically generate purchase orders when stock levels are low.
   • Batch Process: Analyzes stock levels and automatically generates purchase orders for products that need replenishment.

8. Refund Processing:

   • Job: Process refunds for canceled or returned orders.
   • Batch Process: Handles the refund process by checking returned items, validating the transaction, and issuing refunds to customers.

9. Customer Feedback Collection:

   • Job: Collect customer feedback and generate reports.
   • Batch Process: Periodically pulls in customer feedback forms, aggregates responses, and creates reports for analysis.

10. Expired Product Removal:

    • Job: Remove expired products from the inventory system.
    • Batch Process: Scans the inventory for products with expiration dates and automatically removes them from the stock list.

11. Discount Application:

    • Job: Apply discounts for specific products or customer groups.
    • Batch Process: Periodically applies discounts or special pricing to eligible products based on promotional rules.

12. Email Newsletter Sending:

    • Job: Send promotional emails or newsletters to customers.
    • Batch Process: Automatically sends marketing emails to customers on a regular schedule with promotional offers, new arrivals, etc.

13. Sales Tax Calculation:

    • Job: Calculate sales tax for orders based on customer location.
    • Batch Process: Calculates and applies the correct sales tax rate to customer orders.

14. Customer Account Inactivity Alerts:

    • Job: Notify customers with inactive accounts.
    • Batch Process: Periodically checks for inactive customer accounts and sends alerts encouraging them to make a new purchase.

15. Order Shipment Processing:

    • Job: Process shipments for completed orders.
    • Batch Process: Automatically updates the status of orders that are ready for shipment, generating shipping labels and tracking information.

Batch keywords

• Job : Defines the overall batch process.
• Step: Represents a unit of work within a job.
• ItemReader: Reads data from a source (e.g., a database).
• ItemProcessor: Processes the data (e.g., transforms or filters).
• ItemWriter: Writes processed data to a destination (e.g., a database, file, or email).
• Chunk: Groups items together for efficient processing in bulk.
• JobLauncher: Launches and manages the execution of jobs.
• @Scheduled: Used for scheduling jobs to run periodically.

Sales Management Jobs

1. Job (Job)

@Bean
public Job automatedAlertJob() {
    return jobBuilderFactory.get("automatedAlertJob")
            .start(automatedAlertStep())
            .build();
}

2. Step (Step)

@Bean
public Step automatedAlertStep() {
    return stepBuilderFactory.get("automatedAlertStep")
            .<Product, Product>chunk(10)
            .reader(stockLowProductReader())
            .processor(stockLowProductProcessor())
            .writer(stockLowProductWriter())
            .build();
}

3. ItemReader (ItemReader<T>)

@Bean
public ItemReader<Product> stockLowProductReader() {
    return new ItemReader<Product>() {
        @Override
        public Product read() throws Exception {
            List<Product> products = productRepository.findByStockLessThan(10); // Threshold of 10 units
            return products.isEmpty() ? null : products.get(0);
        }
    };
}

4. ItemProcessor (ItemProcessor<I, O>)

@Bean
public ItemProcessor<Product, Product> stockLowProductProcessor() {
    return product -> product; // Here, no processing, just pass the product unchanged
}

5. ItemWriter (ItemWriter<T>)

@Bean
public ItemWriter<Product> stockLowProductWriter() {
    return products -> {
        for (Product product : products) {
            sendAlertEmail(product);
        }
    };
}

6. Chunk (chunk(int size))

@Bean
public Step automatedAlertStep() {
    return stepBuilderFactory.get("automatedAlertStep")
            .<Product, Product>chunk(10)  // This means that 10 items will be read, processed, and written together in a chunk
            .reader(stockLowProductReader())
            .processor(stockLowProductProcessor())
            .writer(stockLowProductWriter())
            .build();
}

7. JobLauncher (JobLauncher)

@Autowired
private JobLauncher jobLauncher;

@Autowired
private Job automatedAlertJob;

@Scheduled(cron = "0 0 0 * * ?")
public void runAutomatedAlertJob() throws JobExecutionException {
    jobLauncher.run(automatedAlertJob, new JobParameters());
}

8. JobExecution (JobExecution)

9. @Scheduled (@Scheduled)

@Scheduled(cron = "0 0 0 * * ?") // Every day at midnight
public void runAutomatedAlertJob() throws JobExecutionException {
    jobLauncher.run(automatedAlertJob, new JobParameters());
}

Spring Boot Project with Spring Batch

<dependencies>
    <!-- Spring Boot and Batch Dependencies -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-batch</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-mail</artifactId> <!-- For sending emails -->
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
</dependencies>

2. Create Batch Jobs and Steps

Automated Alerts (Send an alert when stock is low)

@Configuration
@EnableBatchProcessing
public class AutomatedAlertsJobConfig {

    @Autowired
    private JobBuilderFactory jobBuilderFactory;

    @Autowired
    private StepBuilderFactory stepBuilderFactory;

    @Autowired
    private ProductRepository productRepository; // Assuming Product is an entity

    @Autowired
    private JavaMailSender mailSender;

    @Bean
    public Job automatedAlertJob() {
        return jobBuilderFactory.get("automatedAlertJob")
                .start(automatedAlertStep())
                .build();
    }

    @Bean
    public Step automatedAlertStep() {
        return stepBuilderFactory.get("automatedAlertStep")
                .<Product, Product>chunk(10)
                .reader(stockLowProductReader())
                .processor(stockLowProductProcessor())
                .writer(stockLowProductWriter())
                .build();
    }

    @Bean
    public ItemReader<Product> stockLowProductReader() {
        return new ItemReader<Product>() {
            @Override
            public Product read() throws Exception {
                List<Product> products = productRepository.findByStockLessThan(10); // Threshold of 10 units
                return products.isEmpty() ? null : products.get(0);
            }
        };
    }

    @Bean
    public ItemProcessor<Product, Product> stockLowProductProcessor() {
        return product -> product; // You can add any logic here if needed
    }

    @Bean
    public ItemWriter<Product> stockLowProductWriter() {
        return products -> {
            for (Product product : products) {
                sendAlertEmail(product);
            }
        };
    }

    private void sendAlertEmail(Product product) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setTo("admin@company.com");
        message.setSubject("Low Stock Alert: " + product.getName());
        message.setText("The stock for product " + product.getName() + " is low. Please restock.");
        mailSender.send(message);
    }
}

Stock Updates (Automatically update stock when orders are made)

@Configuration
@EnableBatchProcessing
public class StockUpdateJobConfig {

    @Autowired
    private JobBuilderFactory jobBuilderFactory;

    @Autowired
    private StepBuilderFactory stepBuilderFactory;

    @Autowired
    private OrderRepository orderRepository; // Assuming Order is an entity

    @Autowired
    private ProductRepository productRepository;

    @Bean
    public Job stockUpdateJob() {
        return jobBuilderFactory.get("stockUpdateJob")
                .start(stockUpdateStep())
                .build();
    }

    @Bean
    public Step stockUpdateStep() {
        return stepBuilderFactory.get("stockUpdateStep")
                .<Order, Product>chunk(10)
                .reader(orderReader())
                .processor(orderProcessor())
                .writer(stockUpdateWriter())
                .build();
    }

    @Bean
    public ItemReader<Order> orderReader() {
        return new ItemReader<Order>() {
            @Override
            public Order read() throws Exception {
                List<Order> orders = orderRepository.findUnprocessedOrders();
                return orders.isEmpty() ? null : orders.get(0);
            }
        };
    }

    @Bean
    public ItemProcessor<Order, Product> orderProcessor() {
        return order -> {
            Product product = productRepository.findById(order.getProductId());
            product.setStock(product.getStock() - order.getQuantity());
            return product;
        };
    }

    @Bean
    public ItemWriter<Product> stockUpdateWriter() {
        return products -> productRepository.saveAll(products);
    }
}

Daily Sales Report Generation

@Configuration
@EnableBatchProcessing
public class SalesReportJobConfig {

    @Autowired
    private JobBuilderFactory jobBuilderFactory;

    @Autowired
    private StepBuilderFactory stepBuilderFactory;

    @Autowired
    private SalesRepository salesRepository;

    @Bean
    public Job salesReportJob() {
        return jobBuilderFactory.get("salesReportJob")
                .start(salesReportStep())
                .build();
    }

    @Bean
    public Step salesReportStep() {
        return stepBuilderFactory.get("salesReportStep")
                .<Sale, String>chunk(10)
                .reader(salesReportReader())
                .processor(salesReportProcessor())
                .writer(salesReportWriter())
                .build();
    }

    @Bean
    public ItemReader<Sale> salesReportReader() {
        return salesRepository::findAll; // Assuming `Sale` is an entity
    }

    @Bean
    public ItemProcessor<Sale, String> salesReportProcessor() {
        return sale -> "Sale ID: " + sale.getId() + ", Amount: " + sale.getAmount(); // Customize report format
    }

    @Bean
    public ItemWriter<String> salesReportWriter() {
        return report -> {
            report.forEach(System.out::println); // You can replace with saving to a file or sending via email
        };
    }
}

Main Application Entry

@SpringBootApplication
public class SalesManagementApplication {

    public static void main(String[] args) {
        SpringApplication.run(SalesManagementApplication.class, args);
    }

}

Database Model

@Entity
public class Product {
    @Id
    private Long id;
    private String name;
    private int stock;
    // getters and setters
}

@Entity
public class Order {
    @Id
    private Long id;
    private Long productId;
    private int quantity;
    // getters and setters
}

@Entity
public class Sale {
    @Id
    private Long id;
    private double amount;
    // getters and setters
}

Cron Scheduling (Optional)

@Configuration
@EnableScheduling
public class BatchSchedulingConfig {

    @Autowired
    private JobLauncher jobLauncher;

    @Autowired
    private Job automatedAlertJob;

    @Scheduled(cron = "0 0 0 * * ?") // Every day at midnight
    public void runAutomatedAlertJob() throws JobExecutionException {
        jobLauncher.run(automatedAlertJob, new JobParameters());
    }
}

• Job: Defines the overall batch process.
• Step: Represents a unit of work within a job.
• ItemReader: Reads data from a source (e.g., a database).
• ItemProcessor: Processes the data (e.g., transforms or filters).
• ItemWriter: Writes processed data to a destination (e.g., a database, file, or email).
• Chunk: Groups items together for efficient processing in bulk.
• JobLauncher: Launches and manages the execution of jobs.
• @Scheduled: Used for scheduling jobs to run periodically.