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Astrogeek77Astrogeek77
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SOPE Project Phase 3, 4, 5 completed - doecorataor, observer and exception handling
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Lines changed: 302 additions & 12 deletions

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‎Projects/SOPE/src/main/java/com/gautam/SOPE/SopeApplication.java‎

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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.scheduling.annotation.EnableAsync;
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@SpringBootApplication
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@EnableAsync
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public class SopeApplication {
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public static void main(String[] args) {

‎Projects/SOPE/src/main/java/com/gautam/SOPE/orderengine/controller/OrderController.java‎

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package com.gautam.SOPE.orderengine.controller;
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import com.gautam.SOPE.orderengine.model.Order;
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import com.gautam.SOPE.orderengine.pricing.*;
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import com.gautam.SOPE.orderengine.service.OrderService;
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import com.gautam.SOPE.orderengine.service.PaymentService;
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import org.springframework.web.bind.annotation.*;
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public class OrderController {
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private final PaymentService paymentService;
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private final OrderService orderService;
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public OrderController(PaymentService paymentService) {
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public OrderController(PaymentService paymentService, OrderService orderService) {
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this.paymentService = paymentService;
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this.orderService = orderService;
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}
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// ==========================================
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// Phase 1: Strategy Pattern (Payment)
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// ==========================================
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@PostMapping("/checkout")
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public String checkout(@RequestParam String type, @RequestParam BigDecimal amount) {
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paymentService.checkout(type, amount);
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return "Payment processed via " + type;
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}
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// Simulation
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Order order = new Order();
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order.printStatus(); // Output: Order is currently in [NEW] state...
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// ==========================================
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// Phase 2 & 4: State & Observer (Lifecycle)
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// ==========================================
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@PostMapping("/create")
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public String createOrder() {
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Long id = orderService.createOrder();
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// The Service now handles the Event Publishing internally!
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return "Order created with ID: " + id + " [Status: NewState]. Check logs for Async Email event.";
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}
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order.nextState(); // Output: Order payment processed...
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order.printStatus(); // Output: Order is currently in [PAID] state...
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@PostMapping("/{id}/next")
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public String nextState(@PathVariable Long id) {
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String newState = orderService.advanceOrderStatus(id);
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return "Order " + id + " moved to: " + newState;
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}
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order.nextState(); // Output: Order has been shipped!
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order.printStatus(); // Output: Order is currently in [SHIPPED] state.
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@GetMapping("/{id}")
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public String getOrder(@PathVariable Long id) {
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return "Order " + id + " is currently in: " + orderService.getStatus(id);
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}
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order.nextState(); // Output: Order is already shipped...
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// ==========================================
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// Phase 3: Decorator Pattern (Pricing)
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// ==========================================
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@GetMapping("/price")
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public BigDecimal calculatePrice(@RequestParam BigDecimal cost,
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@RequestParam(defaultValue = "false") boolean tax,
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@RequestParam(defaultValue = "false") boolean pack) {
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return "Payment processed via " + type;
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}
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// 1. Start with Base Price
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PriceComponent finalPrice = new BasePrice(cost);
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// 2. Wrap Dynamically based on flags
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if (tax) {
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finalPrice = new TaxDecorator(finalPrice);
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}
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if (pack) {
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finalPrice = new PackagingDecorator(finalPrice);
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}
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return finalPrice.getCost();
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}
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}

‎Projects/SOPE/src/main/java/com/gautam/SOPE/orderengine/event/OrderPlacedEvent.java‎

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package com.gautam.SOPE.orderengine.event;
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import com.gautam.SOPE.orderengine.model.Order;
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import org.springframework.context.ApplicationEvent;
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public class OrderPlacedEvent extends ApplicationEvent {
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private final Order order;
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public OrderPlacedEvent(Object source, Order order) {
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super(source);
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this.order = order;
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}
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public Order getOrder() {
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return order;
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}
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}

‎Projects/SOPE/src/main/java/com/gautam/SOPE/orderengine/exception/GlobalExceptionHandler.java‎

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package com.gautam.SOPE.orderengine.exception;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.ResponseEntity;
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import org.springframework.web.bind.annotation.ControllerAdvice;
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import org.springframework.web.bind.annotation.ExceptionHandler;
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import java.time.LocalDateTime;
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import java.util.HashMap;
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import java.util.Map;
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@ControllerAdvice
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public class GlobalExceptionHandler {
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// 1. Handle our specific Custom Exception
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@ExceptionHandler(OrderNotFoundException.class)
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public ResponseEntity<Map<String, Object>> handleOrderNotFound(OrderNotFoundException ex) {
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Map<String, Object> errorResponse = new HashMap<>();
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errorResponse.put("timestamp", LocalDateTime.now());
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errorResponse.put("status", HttpStatus.NOT_FOUND.value());
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errorResponse.put("error", "Order Not Found");
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errorResponse.put("message", ex.getMessage());
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return new ResponseEntity<>(errorResponse, HttpStatus.NOT_FOUND);
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}
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// 2. Handle generic "Catch All" (e.g., NullPointer, IllegalArgument)
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@ExceptionHandler(Exception.class)
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public ResponseEntity<Map<String, Object>> handleGlobalException(Exception ex) {
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Map<String, Object> errorResponse = new HashMap<>();
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errorResponse.put("timestamp", LocalDateTime.now());
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errorResponse.put("status", HttpStatus.INTERNAL_SERVER_ERROR.value());
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errorResponse.put("error", "Internal Server Error");
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errorResponse.put("message", ex.getMessage());
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return new ResponseEntity<>(errorResponse, HttpStatus.INTERNAL_SERVER_ERROR);
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}
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}

‎Projects/SOPE/src/main/java/com/gautam/SOPE/orderengine/exception/OrderNotFoundException.java‎

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package com.gautam.SOPE.orderengine.exception;
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public class OrderNotFoundException extends RuntimeException {
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public OrderNotFoundException(String message) {
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super(message);
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}
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}

‎Projects/SOPE/src/main/java/com/gautam/SOPE/orderengine/listener/OrderEventListener.java‎

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package com.gautam.SOPE.orderengine.listener;
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import com.gautam.SOPE.orderengine.event.OrderPlacedEvent;
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import org.springframework.context.event.EventListener;
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import org.springframework.scheduling.annotation.Async;
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import org.springframework.stereotype.Component;
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@Component
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public class OrderEventListener {
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// Listener 1: Email Service
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@Async // This runs in a separate thread!
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@EventListener
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public void handleEmailNotification(OrderPlacedEvent event) {
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try {
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// Simulate a slow network call (2 seconds)
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System.out.println("2. Email Listener: Sending confirmation email...");
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Thread.sleep(2000);
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System.out.println("3. Email Listener: Email sent for Order.");
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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// Listener 2: Inventory Service
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@Async // Runs in parallel with Email
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@EventListener
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public void handleInventoryUpdate(OrderPlacedEvent event) {
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System.out.println("2. Inventory Listener: Deducting stock...");
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}
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}

‎Projects/SOPE/src/main/java/com/gautam/SOPE/orderengine/pricing/BasePrice.java‎

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package com.gautam.SOPE.orderengine.pricing;
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import java.math.BigDecimal;
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public class BasePrice implements PriceComponent {
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private final BigDecimal originalPrice;
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public BasePrice(BigDecimal originalPrice) {
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this.originalPrice = originalPrice;
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}
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@Override
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public BigDecimal getCost() {
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return originalPrice;
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}
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}

‎Projects/SOPE/src/main/java/com/gautam/SOPE/orderengine/pricing/PackagingDecorator.java‎

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package com.gautam.SOPE.orderengine.pricing;
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import java.math.BigDecimal;
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public class PackagingDecorator extends PriceDecorator {
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public PackagingDecorator(PriceComponent price) {
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super(price);
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}
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@Override
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public BigDecimal getCost() {
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return super.getCost().add(new BigDecimal("5.00"));
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}
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}

‎Projects/SOPE/src/main/java/com/gautam/SOPE/orderengine/pricing/PriceComponent.java‎

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package com.gautam.SOPE.orderengine.pricing;
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import java.math.BigDecimal;
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public interface PriceComponent {
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BigDecimal getCost();
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}

‎Projects/SOPE/src/main/java/com/gautam/SOPE/orderengine/pricing/PriceDecorator.java‎

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package com.gautam.SOPE.orderengine.pricing;
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import java.math.BigDecimal;
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public abstract class PriceDecorator implements PriceComponent {
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protected final PriceComponent wrappedPrice;
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public PriceDecorator(PriceComponent price) {
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this.wrappedPrice = price;
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}
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@Override
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public BigDecimal getCost() {
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return wrappedPrice.getCost();
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}
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}

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