Addressed all comments

Signed-off-by: Junwei Dai <[email protected]>

src/main/java/org/opensearch/flowframework/util/ApiSpecFetcher.java

@@ -33,12 +33,12 @@
  */
 public class ApiSpecFetcher {
     private static final Logger logger = LogManager.getLogger(ApiSpecFetcher.class);
-    private static final ParseOptions OPENAPI_PARSER = new ParseOptions();
-    private static final OpenAPIV3Parser PARSER = new OpenAPIV3Parser();
+    private static final ParseOptions PARSE_OPTIONS = new ParseOptions();
+    private static final OpenAPIV3Parser OPENAPI_PARSER = new OpenAPIV3Parser();
 
     static {
-        OPENAPI_PARSER.setResolve(true);
-        OPENAPI_PARSER.setResolveFully(true);
+        PARSE_OPTIONS.setResolve(true);
+        PARSE_OPTIONS.setResolveFully(true);
     }
 
     /**
@@ -50,7 +50,7 @@ public class ApiSpecFetcher {
      */
     public static OpenAPI fetchApiSpec(String apiSpecUri) {
         logger.info("Parsing API spec from URI: {}", apiSpecUri);
-        SwaggerParseResult result = PARSER.readLocation(apiSpecUri, null, OPENAPI_PARSER);
+        SwaggerParseResult result = OPENAPI_PARSER.readLocation(apiSpecUri, null, PARSE_OPTIONS);
         OpenAPI openApi = result.getOpenAPI();
 
         if (openApi == null) {

src/test/java/org/opensearch/flowframework/util/ApiSpecFetcherTests.java

@@ -19,6 +19,10 @@
 import io.swagger.v3.oas.models.OpenAPI;
 
 import static org.opensearch.flowframework.common.CommonValue.ML_COMMONS_API_SPEC_YAML_URI;
+import static org.opensearch.rest.RestRequest.Method.DELETE;
+import static org.opensearch.rest.RestRequest.Method.PATCH;
+import static org.opensearch.rest.RestRequest.Method.POST;
+import static org.opensearch.rest.RestRequest.Method.PUT;
 
 public class ApiSpecFetcherTests extends OpenSearchTestCase {
 
@@ -48,7 +52,7 @@ public void testFetchApiSpecThrowsException() throws Exception {
     public void testCompareRequiredFieldsSuccess() throws Exception {
 
         String path = "/_plugins/_ml/agents/_register";
-        RestRequest.Method method = RestRequest.Method.POST;
+        RestRequest.Method method = POST;
 
         // Assuming REGISTER_AGENT step in the enum has these required fields
         List<String> expectedRequiredParams = Arrays.asList("name", "type");
@@ -61,7 +65,7 @@ public void testCompareRequiredFieldsSuccess() throws Exception {
     public void testCompareRequiredFieldsFailure() throws Exception {
 
         String path = "/_plugins/_ml/agents/_register";
-        RestRequest.Method method = RestRequest.Method.POST;
+        RestRequest.Method method = POST;
 
         List<String> wrongRequiredParams = Arrays.asList("nonexistent_param");
 
@@ -73,7 +77,7 @@ public void testCompareRequiredFieldsFailure() throws Exception {
     public void testCompareRequiredFieldsThrowsException() throws Exception {
         String invalidUri = "http://invalid-url.com/fail.yaml";
         String path = "/_plugins/_ml/agents/_register";
-        RestRequest.Method method = RestRequest.Method.POST;
+        RestRequest.Method method = PUT;
 
         Exception exception = expectThrows(
             Exception.class,
@@ -90,7 +94,7 @@ public void testUnsupportedMethodException() throws IllegalArgumentException {
                 List.of("name", "type"),
                 ML_COMMONS_API_SPEC_YAML_URI,
                 "/_plugins/_ml/agents/_register",
-                RestRequest.Method.PATCH
+                PATCH
             );
         });
 
@@ -103,7 +107,7 @@ public void testNoOperationFoundException() throws Exception {
                 List.of("name", "type"),
                 ML_COMMONS_API_SPEC_YAML_URI,
                 "/_plugins/_ml/agents/_register",
-                RestRequest.Method.DELETE // PATCH should be unsupported
+                DELETE
             );
         });