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public class OrderGrabSystem {
    // 三级缓存架构
    private ConcurrentHashMap<Long, Order> memoryCache;
    private RedisTemplate<String, Order> redisCache;
    private MongoDBRepository mongoDBRepository;

    // 高精度定位服务
    @Autowired
    private GPSLocationService locationService;

    // 智能过滤模块
    public List<Order> filterOrders(List<Order> orders) {
        return orders.parallelStream()
            .filter(this::distanceFilter)
            .filter(this::priceFilter)
            .filter(this::timeFilter)
            .sorted(Comparator.comparingDouble(Order::getPriorityScore))
            .collect(Collectors.toList());
    }
}

public class Http2Client {
    private static final ConnectionPool connectionPool = new ConnectionPool(
        5,  // 最大连接数
        300 // 保持时间(秒)
    );

    public String pushOrder(Order order) throws IOException {
        OkHttpClient client = new OkHttpClient.Builder()
            .connectionPool(connectionPool)
            .pingInterval(10, TimeUnit.SECONDS)
            .build();
        
        Request request = new Request.Builder()
            .url("https://api.meituan.com/order/push")
            .post(RequestBody.create(order.toJson(), JSON))
            .build();
        
        try (Response response = client.newCall(request).execute()) {
            return response.body().string();
        }
    }
}

@EnableAsync
@Configuration
public class AsyncConfig implements AsyncConfigurer {
    @Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(20);
        executor.setMaxPoolSize(100);
        executor.setQueueCapacity(500);
        executor.setThreadNamePrefix("OrderGrabber-");
        executor.initialize();
        return executor;
    }
}

@Service
public class OrderService {
    @Async
    public CompletableFuture<Boolean> grabOrder(Order order) {
        // 抢单核心逻辑
        return CompletableFuture.completedFuture(
            orderLockManager.tryLock(order.getId())
        );
    }
}

public class DecisionEngine {
    private static final double BASE_SCORE = 100.0;
    
    public double calculatePriority(Order order, Rider rider) {
        double distanceScore = Math.exp(-0.05 * calculateDistance(
            rider.getLocation(),
            order.getPickupLocation()
        ));
        
        double timeScore = 1.0 / (1.0 + order.getWaitingMinutes()/30.0);
        
        double priceScore = order.getFee() / 50.0;
        
        return BASE_SCORE * distanceScore * timeScore * priceScore;
    }
}
import net.sourceforge.tess4j.Tesseract;
import net.sourceforge.tess4j.TesseractException;
import java.awt.image.BufferedImage;

public class OcrEngine {
    private final Tesseract tesseract;
    
    public OcrEngine(String tessDataPath) {
        this.tesseract = new Tesseract();
        tesseract.setDatapath(tessDataPath);
        tesseract.setLanguage("chi_sim+eng");
        tesseract.setPageSegMode(1);
        tesseract.setOcrEngineMode(3);
    }

    public String recognize(BufferedImage image) throws TesseractException {
        return tesseract.doOCR(image);
    }
    
    public String recognizeWithConfig(BufferedImage image, 
                                    String language, 
                                    int pageSegMode) throws TesseractException {
        tesseract.setLanguage(language);
        tesseract.setPageSegMode(pageSegMode);
        return tesseract.doOCR(image);
    }
}

import net.sourceforge.tess4j.Tesseract;
import net.sourceforge.tess4j.TesseractException;
import java.awt.image.BufferedImage;

public class OcrEngine {
    private final Tesseract tesseract;
    
    public OcrEngine(String tessDataPath) {
        this.tesseract = new Tesseract();
        tesseract.setDatapath(tessDataPath);
        tesseract.setLanguage("chi_sim+eng");
        tesseract.setPageSegMode(1);
        tesseract.setOcrEngineMode(3);
    }

    public String recognize(BufferedImage image) throws TesseractException {
        return tesseract.doOCR(image);
    }
    
    public String recognizeWithConfig(BufferedImage image, 
                                    String language, 
                                    int pageSegMode) throws TesseractException {
        tesseract.setLanguage(language);
        tesseract.setPageSegMode(pageSegMode);
        return tesseract.doOCR(image);
    }
}

 java.awt.image.BufferedImage;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;

public class ImagePreprocessor {
    public static BufferedImage convertToGrayscale(BufferedImage src) {
        BufferedImage dest = new BufferedImage(
            src.getWidth(), src.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
        dest.getGraphics().drawImage(src, 0, 0, null);
        return dest;
    }

    public static BufferedImage sharpenImage(BufferedImage src) {
        float[] sharpenMatrix = {
            0.0f, -1.0f, 0.0f,
            -1.0f, 5.0f, -1.0f,
            0.0f, -1.0f, 0.0f
        };
        Kernel kernel = new Kernel(3, 3, sharpenMatrix);
        ConvolveOp op = new ConvolveOp(kernel);
        return op.filter(src, null);
    }
    
    public static BufferedImage binarize(BufferedImage src, int threshold) {
        BufferedImage dest = new BufferedImage(
            src.getWidth(), src.getHeight(), BufferedImage.TYPE_BYTE_BINARY);
        for (int y = 0; y < src.getHeight(); y++) {
            for (int x = 0; x < src.getWidth(); x++) {
                int rgb = src.getRGB(x, y);
                int r = (rgb >> 16) & 0xff;
                int g = (rgb >> 8) & 0xff;
                int b = rgb & 0xff;
                int luminance = (int)(0.299 * r + 0.587 * g + 0.114 * b);
                dest.setRGB(x, y, luminance > threshold ? 0xFFFFFF : 0x000000);
            }
        }
        return dest;
    }
}

import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;

@Service
public class OcrService {
    private final OcrEngine ocrEngine;
    
    public OcrService() {
        this.ocrEngine = new OcrEngine("/usr/share/tesseract-ocr/4.00/tessdata");
    }
    
    public String processImage(MultipartFile file) throws IOException, TesseractException {
        BufferedImage image = ImageIO.read(file.getInputStream());
        BufferedImage processed = ImagePreprocessor.sharpenImage(
            ImagePreprocessor.convertToGrayscale(image)
        );
        return ocrEngine.recognize(processed);
    }
    
    public String processImageWithLang(MultipartFile file, String lang) 
        throws IOException, TesseractException {
        BufferedImage image = ImageIO.read(file.getInputStream());
        return ocrEngine.recognizeWithConfig(image, lang, 3);
    }
}