Protocol selection priority update

Author: sbaluja

tools/code-generation/generator/src/main/java/com/amazonaws/util/awsclientgenerator/domainmodels/codegeneration/Metadata.java

@@ -17,12 +17,12 @@
 @Data
 public class Metadata {
     private static List<String> supportedProtocols = ImmutableList.of(
+            "smithy-rpc-v2-cbor",
             "json",
             "rest-json",
             "rest-xml",
             "query",
-            "ec2",
-            "smithy-rpc-v2-cbor"
+            "ec2"
     );
 
     private String apiVersion;
@@ -72,6 +72,11 @@ public String findFirstSupportedProtocol() {
             return protocol;
         }
 
+        //We're releasing CBOR so current services (only arc-region-switch) need to opt into the new protocol priority
+        if (serviceFullName != null && serviceFullName.equalsIgnoreCase("ARC - Region switch")){
+            return "json";
+        }
+
         return protocols.stream().filter(supportedProtocols::contains)
                 .min(Comparator.comparingInt(protocolName -> supportedProtocols.indexOf(protocolName)))
                 .orElseThrow(() -> new RuntimeException(String.format("No supported protocol found for %s", serviceFullName)));