refs #995 - fixing cache access

Author: frantuma

modules/swagger-parser/src/main/java/io/swagger/parser/ResolverCache.java

@@ -28,6 +28,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -58,7 +59,7 @@ public class ResolverCache {
     /*
     a map that stores original external references, and their associated renamed references
      */
-    private Map<String, String> renameCache = new HashMap<>();
+    private Map<String, String> renameCache = new ConcurrentHashMap<>();
 
     public ResolverCache(Swagger swagger, List<AuthorizationValue> auths, String parentFileLocation) {
         this.swagger = swagger;

modules/swagger-parser/src/main/java/io/swagger/parser/processors/ExternalRefProcessor.java

@@ -210,8 +210,9 @@ private void processDiscriminator(String discriminator, Map<String, Property> pr
                     }
                 }else if (prop.getValue() instanceof RefProperty) {
                     String ref = ((RefProperty) prop.getValue()).getSimpleRef();
-                    for (String key : cache.getRenameCache().keySet()) {
-                        String value = cache.getRenamedRef(key);
+                    Map<String, String> renameCache = cache.getRenameCache();
+                    for (String key : renameCache.keySet()) {
+                        String value = renameCache.get(key);
                         if (value.equals(ref)) {
                             Object resolved = cache.getResolutionCache().get(key);
                             if (resolved instanceof ModelImpl) {