Add X W Z flag for metaget response

Author: samuelfu

evcache-core/src/main/java/com/netflix/evcache/operation/EVCacheItemMetaData.java

@@ -43,6 +43,22 @@ public class EVCacheItemMetaData {
     public int slabClass;
     public int sizeInBytes;
 
+    public boolean stale;
+    public boolean itemWonRecache;
+    public boolean itemLostRecache;
+
+    public void setStale(boolean stale) {
+        this.stale = stale;
+    }
+
+    public void setItemWonRecache(boolean itemWonRecache) {
+        this.itemWonRecache = itemWonRecache;
+    }
+
+    public void setItemLostRecache(boolean itemLostRecache) {
+        this.itemLostRecache = itemLostRecache;
+    }
+
     public EVCacheItemMetaData() {
         super();
     }

evcache-core/src/main/java/net/spy/memcached/EVCacheMemcachedClient.java

@@ -915,6 +915,18 @@ public void gotMetaData(String k, char flag, String fVal) {
                     getDataSizeDistributionSummary(EVCacheMetricsFactory.META_GET_OPERATION, EVCacheMetricsFactory.READ, EVCacheMetricsFactory.INTERNAL_TTL).record(ttlLeft);
                     break;
 
+                case 'X':
+                    evItem.getItemMetaData().setStale(true);
+                    break;
+
+                case 'W':
+                    evItem.getItemMetaData().setItemWonRecache(true);
+                    break;
+
+                case 'Z':
+                    evItem.getItemMetaData().setItemLostRecache(true);
+                    break;
+
                 default:
                     break;
                 }