Factor out blob -> hash genrating code so it is common to all file registries.

1 files changed, 6 insertions, 0 deletions

diff --git a/config-model-api/src/main/java/com/yahoo/config/application/api/FileRegistry.java b/config-model-api/src/main/java/com/yahoo/config/application/api/FileRegistry.java
index 9d049ae0847..0a809e6b542 100644
--- a/config-model-api/src/main/java/com/yahoo/config/application/api/FileRegistry.java
+++ b/config-model-api/src/main/java/com/yahoo/config/application/api/FileRegistry.java
@@ -5,6 +5,7 @@ import java.nio.ByteBuffer;
 import java.util.List;
 
 import com.yahoo.config.FileReference;
+import net.jpountz.xxhash.XXHashFactory;
 
 
 /**
@@ -34,4 +35,9 @@ public interface FileRegistry {
         }
     }
 
+    static String blobName(ByteBuffer blob) {
+        long blobHash = XXHashFactory.fastestJavaInstance().hash64().hash(blob, 0);
+        return Long.toHexString(blobHash);
+    }
+
 }