feat: 设计模式-责任链模块

aioj-backend-common/src/main/java/cn/meowrain/aioj/backend/framework/banner/EnvironmentBanner.java

@@ -0,0 +1,70 @@
+package cn.meowrain.aioj.backend.framework.banner;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.context.event.ApplicationReadyEvent;
+import org.springframework.context.ApplicationListener;
+import org.springframework.core.env.Environment;
+import org.springframework.stereotype.Component;
+
+import java.lang.management.ManagementFactory;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
+@Slf4j
+@Component
+public class EnvironmentBanner implements ApplicationListener<ApplicationReadyEvent> {
+
+    @Value("${spring.application.name:unknown}")
+    private String appName;
+
+    @Override
+    public void onApplicationEvent(ApplicationReadyEvent event) {
+
+        Environment env = event.getApplicationContext().getEnvironment();
+
+        // Active profiles
+        String profiles = String.join(",", env.getActiveProfiles());
+        if (profiles.isEmpty()) {
+            profiles = "default";
+        }
+
+        // Port
+        String port = env.getProperty("server.port", "unknown");
+
+        // JVM info
+        String jvm = System.getProperty("java.version") + " (" + System.getProperty("java.vendor") + ")";
+
+        // PID
+        String pid = ManagementFactory.getRuntimeMXBean().getPid() + "";
+
+        // Time
+        String time = LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
+
+        // Git commit id (如果没有 git.properties，不会报错)
+        String gitCommit = env.getProperty("git.commit.id.abbrev", "N/A");
+
+        printBanner(appName, profiles, port, jvm, pid, time, gitCommit);
+    }
+
+    private void printBanner(String appName,
+                             String profiles,
+                             String port,
+                             String jvm,
+                             String pid,
+                             String time,
+                             String gitCommit) {
+
+        String banner = "\n" +
+                "------------------------------------------------------------\n" +
+                "  ✨AI Online Judge✨ - " + appName + "\n" +
+                "  Environment : " + profiles + "\n" +
+                "  Port        : " + port + "\n" +
+                "  Git Commit  : " + gitCommit + "\n" +
+                "  JVM         : " + jvm + "\n" +
+                "  PID         : " + pid + "\n" +
+                "  Started At  : " + time + "\n" +
+                "------------------------------------------------------------\n";
+        System.out.println(banner);
+    }
+}

aioj-backend-common/src/main/java/cn/meowrain/aioj/backend/framework/designpattern/chains/AbstractChianHandler.java

@@ -0,0 +1,19 @@
+package cn.meowrain.aioj.backend.framework.designpattern.chains;
+
+import org.springframework.core.Ordered;
+
+public interface AbstractChianHandler<T> extends Ordered {
+    /**
+     * 执行责任链逻辑
+     *
+     * @param requestParam 责任链执行入参
+     */
+    void handle(T requestParam);
+
+    /**
+     * 责任链组件标识
+     *
+     * @return String
+     */
+    String mark();
+}

aioj-backend-common/src/main/java/cn/meowrain/aioj/backend/framework/designpattern/chains/CommonChainContext.java

@@ -0,0 +1,71 @@
+package cn.meowrain.aioj.backend.framework.designpattern.chains;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.BeansException;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.ApplicationContextAware;
+import org.springframework.core.Ordered;
+import org.springframework.stereotype.Component;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+/**
+ * 公共责任链容器
+ *
+ * @param <T>
+ */
+@Component
+@Slf4j
+public class CommonChainContext<T> implements ApplicationContextAware, CommandLineRunner {
+    private ApplicationContext applicationContext;
+
+    @Override
+    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
+        this.applicationContext = applicationContext;
+    }
+
+    private final Map<String, List<AbstractChianHandler<T>>> abstractChainHandlerMap = new HashMap<>();
+
+    public void handler(String mark, T requestParam) {
+        List<AbstractChianHandler<T>> merchantAdminAbstractChainHandlers = abstractChainHandlerMap.get(mark);
+        if (merchantAdminAbstractChainHandlers == null || merchantAdminAbstractChainHandlers.isEmpty()) {
+            throw new RuntimeException(String.format("[%s] Chain of Responsibility ID is undefined.", mark));
+        }
+        merchantAdminAbstractChainHandlers.forEach(h -> {
+            h.handle(requestParam);
+        });
+    }
+
+    @Override
+    public void run(String... args) throws Exception {
+        log.info("【责任链路初始化】开始加载并分组所有处理器...");
+        applicationContext.getBeansOfType(AbstractChianHandler.class)
+                .values()
+                .forEach(handler -> {
+                    // 打印当前处理器的类名和它所属的 ChainMark
+                    String handlerName = handler.getClass().getSimpleName();
+                    String mark = handler.mark();
+                    log.info("    -> 发现处理器：{}，归属链路：{}", handlerName, mark);
+                    abstractChainHandlerMap
+                            .computeIfAbsent(handler.mark(), k -> new ArrayList<>())
+                            .add(handler);
+                });
+
+        // 步骤 2: 对每个链路中的处理器进行排序 (Sort 阶段)
+        abstractChainHandlerMap.forEach((mark, handlers) -> {
+            handlers.sort(Comparator.comparing(Ordered::getOrder));
+
+            // 打印排序后的 Bean 列表
+            String sortedList = handlers.stream()
+                    .map(h -> String.format("%s (Order:%d)", h.getClass().getSimpleName(), h.getOrder()))
+                    .collect(Collectors.joining(" -> "));
+
+            log.info("    ✅ 链路 {} 排序完成：{}", mark, sortedList);
+        });
+
+        log.info("【责任链路初始化】所有处理器链已完全就绪。");
+    }
+
+}