inline joinValues()

Author: panchenko

servlet/src/main/java/io/grpc/servlet/ServletServerStream.java

@@ -46,6 +46,7 @@
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.function.BiConsumer;
+import java.util.function.BiFunction;
 import java.util.function.Supplier;
 import java.util.logging.Logger;
 import javax.annotation.Nullable;
@@ -283,8 +284,8 @@ public void writeTrailers(Metadata trailers, boolean headersSent, Status status)
       if (!headersSent) {
         writeHeadersToServletResponse(trailers);
       } else {
-        serializeHeaders(trailers, (key, value) ->
-            trailerSupplier.get().merge(key, value, TrailerSupplier::joinValues));
+        BiFunction<String, String, String> merge = (oldV, newV) -> oldV + "," + newV;
+        serializeHeaders(trailers, (key, value) -> trailerSupplier.get().merge(key, value, merge));
       }
 
       writer.complete();
@@ -322,10 +323,6 @@ private static final class TrailerSupplier implements Supplier<Map<String, Strin
     public Map<String, String> get() {
       return trailers;
     }
-
-    static String joinValues(String oldValue, String newValue) {
-      return oldValue + "," + newValue;
-    }
   }
 
   static String toHexString(byte[] bytes, int length) {