spring core advanced : log trace - templete callback pattern

spring-core/advanced/src/main/java/com/example/advanced/app/v5/OrderControllerV5.java

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+package com.example.advanced.app.v5;
+
+import com.example.advanced.trace.callback.TraceCallback;
+import com.example.advanced.trace.callback.TraceTemplate;
+import com.example.advanced.trace.logtrace.LogTrace;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class OrderControllerV5 {
+
+    private final OrderServiceV5 orderService;
+    private final TraceTemplate template;
+
+    public OrderControllerV5(OrderServiceV5 orderService, LogTrace logTrace) {
+        this.orderService = orderService;
+        this.template = new TraceTemplate(logTrace);
+    }
+
+    @GetMapping("/v5/request")
+    public String request(String itemId) {
+
+        return template.execute("OrderController.request()", new TraceCallback<String>() {
+            @Override
+            public String call() {
+                orderService.orderItem(itemId);
+                return "ok";
+            }
+        });
+    }
+}

spring-core/advanced/src/main/java/com/example/advanced/app/v5/OrderRepositoryV5.java

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+package com.example.advanced.app.v5;
+
+import com.example.advanced.trace.callback.TraceTemplate;
+import com.example.advanced.trace.logtrace.LogTrace;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public class OrderRepositoryV5 {
+
+    private final TraceTemplate template;
+
+    public OrderRepositoryV5(LogTrace logTrace) {
+        this.template = new TraceTemplate(logTrace);
+    }
+
+    public void save(String itemId) {
+
+        template.execute("OrderRepository.save()", () -> {
+            if (itemId.equals("ex")) {
+                throw new IllegalStateException("예외 발생!");
+            }
+            sleep(1000);
+            return null;
+        });
+    }
+
+    private void sleep(int millis) {
+        try {
+            Thread.sleep(millis);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+}

spring-core/advanced/src/main/java/com/example/advanced/app/v5/OrderServiceV5.java

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+package com.example.advanced.app.v5;
+
+import com.example.advanced.trace.callback.TraceTemplate;
+import com.example.advanced.trace.logtrace.LogTrace;
+import org.springframework.stereotype.Service;
+
+@Service
+public class OrderServiceV5 {
+
+    private final OrderRepositoryV5 orderRepository;
+    private final TraceTemplate template;
+
+    public OrderServiceV5(OrderRepositoryV5 orderRepository, LogTrace logTrace) {
+        this.orderRepository = orderRepository;
+        this.template = new TraceTemplate(logTrace);
+    }
+
+    public void orderItem(String itemId) {
+
+        template.execute("OrderService.orderItem()", () -> {
+            orderRepository.save(itemId);
+            return null;
+        });
+    }
+}

spring-core/advanced/src/main/java/com/example/advanced/trace/callback/TraceCallback.java

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+package com.example.advanced.trace.callback;
+
+public interface TraceCallback<T> {
+    T call();
+}

spring-core/advanced/src/main/java/com/example/advanced/trace/callback/TraceTemplate.java

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+package com.example.advanced.trace.callback;
+
+import com.example.advanced.trace.TraceStatus;
+import com.example.advanced.trace.logtrace.LogTrace;
+
+public class TraceTemplate {
+
+    private final LogTrace trace;
+
+    public TraceTemplate(LogTrace trace) {
+        this.trace = trace;
+    }
+
+    public <T> T execute(String message, TraceCallback<T> callback) {
+        TraceStatus status = null;
+        try {
+            status = trace.begin(message);
+
+            T result = callback.call();
+
+            trace.end(status);
+            return result;
+        } catch (Exception e) {
+            trace.exception(status, e);
+            throw e;
+        }
+    }
+}

spring-core/advanced/src/test/java/com/example/advanced/trace/strategy/code/template/Callback.java

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+package com.example.advanced.trace.strategy.code.template;
+
+public interface Callback {
+    void call();
+}

spring-core/advanced/src/test/java/com/example/advanced/trace/strategy/code/template/TemplateCallbackTest.java

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+package com.example.advanced.trace.strategy.code.template;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.jupiter.api.Test;
+
+@Slf4j
+public class TemplateCallbackTest {
+
+    /**
+     * 템플릿 콜백 패턴
+     */
+    @Test
+    void callbackV1() {
+        TimeLogTemplate template = new TimeLogTemplate();
+        template.execute(new Callback() {
+            @Override
+            public void call() {
+                log.info("비즈니스 로직1 실행");
+            }
+        });
+        template.execute(new Callback() {
+            @Override
+            public void call() {
+                log.info("비즈니스 로직2 실행");
+            }
+        });
+    }
+
+    @Test
+    void callbackV2() {
+        TimeLogTemplate template = new TimeLogTemplate();
+        template.execute(() -> log.info("비즈니스 로직1 실행"));
+        template.execute(() -> log.info("비즈니스 로직2 실행"));
+    }
+}

spring-core/advanced/src/test/java/com/example/advanced/trace/strategy/code/template/TimeLogTemplate.java

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+package com.example.advanced.trace.strategy.code.template;
+
+import lombok.extern.slf4j.Slf4j;
+
+@Slf4j
+public class TimeLogTemplate {
+
+    public void execute(Callback callback) {
+        long startTime = System.currentTimeMillis();
+        // 비즈니스 로직 실행
+        callback.call();
+        long endTime = System.currentTimeMillis();
+        long resultTime = endTime - startTime;
+        log.info("resultTime={}", resultTime);
+    }
+}