Add logging in API Gateway

api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/ImageClientImpl.java

@@ -23,11 +23,16 @@
 
 package com.iluwatar.api.gateway;
 
+import static org.slf4j.LoggerFactory.getLogger;
+
 import java.io.IOException;
 import java.net.URI;
 import java.net.http.HttpClient;
 import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
 import java.net.http.HttpResponse.BodyHandlers;
+
+import org.slf4j.Logger;
 import org.springframework.stereotype.Component;
 
 /**
@@ -35,6 +40,8 @@ import org.springframework.stereotype.Component;
  */
 @Component
 public class ImageClientImpl implements ImageClient {
+  private static final Logger LOGGER = getLogger(ImageClientImpl.class);
+
   /**
    * Makes a simple HTTP Get request to the Image microservice.
    *
@@ -49,12 +56,26 @@ public class ImageClientImpl implements ImageClient {
         .build();
 
     try {
+      LOGGER.info("Sending request to fetch image path");
       var httpResponse = httpClient.send(httpGet, BodyHandlers.ofString());
+      logResponse(httpResponse);
       return httpResponse.body();
     } catch (IOException | InterruptedException e) {
-      e.printStackTrace();
+      LOGGER.error("Failure occurred while getting image path", e);
     }
 
     return null;
   }
+
+  private void logResponse(HttpResponse<String> httpResponse) {
+    if (isSuccessResponse(httpResponse.statusCode())) {
+      LOGGER.info("Image path received successfully");
+    } else {
+      LOGGER.warn("Image path request failed");
+    }
+  }
+
+  private boolean isSuccessResponse(int responseCode) {
+    return responseCode >= 200 && responseCode <= 299;
+  }
 }

api-gateway/api-gateway-service/src/main/java/com/iluwatar/api/gateway/PriceClientImpl.java

@@ -23,18 +23,26 @@
 
 package com.iluwatar.api.gateway;
 
+import static org.slf4j.LoggerFactory.getLogger;
+
 import java.io.IOException;
 import java.net.URI;
 import java.net.http.HttpClient;
 import java.net.http.HttpRequest;
+import java.net.http.HttpResponse;
 import java.net.http.HttpResponse.BodyHandlers;
+
+import org.slf4j.Logger;
 import org.springframework.stereotype.Component;
 
+
 /**
  * An adapter to communicate with the Price microservice.
  */
 @Component
 public class PriceClientImpl implements PriceClient {
+  private static final Logger LOGGER = getLogger(PriceClientImpl.class);
+
   /**
    * Makes a simple HTTP Get request to the Price microservice.
    *
@@ -49,12 +57,26 @@ public class PriceClientImpl implements PriceClient {
         .build();
 
     try {
+      LOGGER.info("Sending request to fetch price info");
       var httpResponse = httpClient.send(httpGet, BodyHandlers.ofString());
+      logResponse(httpResponse);
       return httpResponse.body();
     } catch (IOException | InterruptedException e) {
-      e.printStackTrace();
+      LOGGER.error("Failure occurred while getting price info", e);
     }
 
     return null;
   }
+
+  private void logResponse(HttpResponse<String> httpResponse) {
+    if (isSuccessResponse(httpResponse.statusCode())) {
+      LOGGER.info("Price info received successfully");
+    } else {
+      LOGGER.warn("Price info request failed");
+    }
+  }
+
+  private boolean isSuccessResponse(int responseCode) {
+    return responseCode >= 200 && responseCode <= 299;
+  }
 }

api-gateway/image-microservice/src/main/java/com/iluwatar/image/microservice/ImageController.java

@@ -23,15 +23,20 @@
 
 package com.iluwatar.image.microservice;
 
+import static org.slf4j.LoggerFactory.getLogger;
+
+import org.slf4j.Logger;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RestController;
 
+
 /**
  * Exposes the Image microservice's endpoints.
  */
 @RestController
 public class ImageController {
+  private static final Logger LOGGER = getLogger(ImageController.class);
 
   /**
    * An endpoint for a user to retrieve an image path.
@@ -40,6 +45,7 @@ public class ImageController {
    */
   @RequestMapping(value = "/image-path", method = RequestMethod.GET)
   public String getImagePath() {
+    LOGGER.info("Successfully found image path");
     return "/product-image.png";
   }
 }

api-gateway/price-microservice/src/main/java/com/iluwatar/price/microservice/PriceController.java

@@ -23,15 +23,20 @@
 
 package com.iluwatar.price.microservice;
 
+import static org.slf4j.LoggerFactory.getLogger;
+
+import org.slf4j.Logger;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestMethod;
 import org.springframework.web.bind.annotation.RestController;
 
+
 /**
  * Exposes the Price microservice's endpoints.
  */
 @RestController
 public class PriceController {
+  private static final Logger LOGGER = getLogger(PriceController.class);
 
   /**
    * An endpoint for a user to retrieve a product's price.
@@ -40,6 +45,7 @@ public class PriceController {
    */
   @RequestMapping(value = "/price", method = RequestMethod.GET)
   public String getPrice() {
+    LOGGER.info("Successfully found price info");
     return "20";
   }
 }