Method call

src/meta/UIDMeta.java:221–250

Executes the CompareAndSet after merging changes @return True if the CAS was successful, false if the stored data was modified during flight.

(final ArrayList<KeyValue> row)

         * was modified during flight.
         */
        @Override
        public Deferred<Boolean> call(final ArrayList<KeyValue> row) 
          throws Exception {
          
          final UIDMeta stored_meta;
          if (row == null || row.isEmpty()) {
            stored_meta = null;
          } else {
            stored_meta = JSON.parseToObject(row.get(0).value(), UIDMeta.class);
            stored_meta.initializeChangedMap();
          }
          
          final byte[] original_meta = row == null || row.isEmpty() ? 
              new byte[0] : row.get(0).value();

          if (stored_meta != null) {
            local_meta.syncMeta(stored_meta, overwrite);
          }
       
          // verify the name is set locally just to be safe
          if (name == null || name.isEmpty()) {
            local_meta.name = name;
          }
          
          final PutRequest put = new PutRequest(tsdb.uidTable(), 
              UniqueId.stringToUid(uid), FAMILY, 
              (type.toString().toLowerCase() + "_meta").getBytes(CHARSET), 
              local_meta.getStorageJSON());
          return tsdb.getClient().compareAndSet(put, original_meta);
        }
        
      }