spring core advanced : log trace v4 - template method

spring-core/advanced/src/main/java/com/example/advanced/app/v4/OrderControllerV4.java

@@ -0,0 +1,28 @@
+package com.example.advanced.app.v4;
+
+import com.example.advanced.trace.logtrace.LogTrace;
+import com.example.advanced.trace.template.AbstractTemplate;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequiredArgsConstructor
+public class OrderControllerV4 {
+
+    private final OrderServiceV4 orderService;
+    private final LogTrace trace;
+
+    @GetMapping("/v4/request")
+    public String request(String itemId) {
+
+        AbstractTemplate<String> template = new AbstractTemplate<String>(trace) {
+            @Override
+            protected String call() {
+                orderService.orderItem(itemId);
+                return "ok";
+            }
+        };
+        return template.execute("OrderController.request()");
+    }
+}

spring-core/advanced/src/main/java/com/example/advanced/app/v4/OrderRepositoryV4.java

@@ -0,0 +1,37 @@
+package com.example.advanced.app.v4;
+
+import com.example.advanced.trace.logtrace.LogTrace;
+import com.example.advanced.trace.template.AbstractTemplate;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Repository;
+
+@Repository
+@RequiredArgsConstructor
+public class OrderRepositoryV4 {
+
+    private final LogTrace trace;
+
+    public void save(String itemId) {
+
+        AbstractTemplate<Void> template = new AbstractTemplate<Void>(trace) {
+            @Override
+            protected Void call() {
+                // 저장 로직
+                if (itemId.equals("ex")) {
+                    throw new IllegalStateException("예외 발생!");
+                }
+                sleep(1000);
+                return null;
+            }
+        };
+        template.execute("OrderRepository.save()");
+    }
+
+    private void sleep(int millis) {
+        try {
+            Thread.sleep(millis);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        }
+    }
+}

spring-core/advanced/src/main/java/com/example/advanced/app/v4/OrderServiceV4.java

@@ -0,0 +1,26 @@
+package com.example.advanced.app.v4;
+
+import com.example.advanced.trace.logtrace.LogTrace;
+import com.example.advanced.trace.template.AbstractTemplate;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class OrderServiceV4 {
+
+    private final OrderRepositoryV4 orderRepository;
+    private final LogTrace trace;
+
+    public void orderItem(String itemId) {
+
+        AbstractTemplate<Void> template = new AbstractTemplate<Void>(trace) {
+            @Override
+            protected Void call() {
+                orderRepository.save(itemId);
+                return null;
+            }
+        };
+        template.execute("OrderService.orderItem()");
+    }
+}

spring-core/advanced/src/main/java/com/example/advanced/trace/template/AbstractTemplate.java

@@ -0,0 +1,30 @@
+package com.example.advanced.trace.template;
+
+import com.example.advanced.trace.TraceStatus;
+import com.example.advanced.trace.logtrace.LogTrace;
+
+public abstract class AbstractTemplate<T> {
+
+    private final LogTrace trace;
+
+    public AbstractTemplate(LogTrace trace) {
+        this.trace = trace;
+    }
+
+    public T execute(String message) {
+        TraceStatus status = null;
+        try {
+            status = trace.begin(message);
+
+            T result = call();
+
+            trace.end(status);
+            return result;
+        } catch (Exception e) {
+            trace.exception(status, e);
+            throw e;
+        }
+    }
+
+    protected abstract T call();
+}