public Status read()

in scylla/src/main/java/site/ycsb/db/scylla/ScyllaCQLClient.java [287:350]
50 lines of code
12 McCabe index (conditional complexity)

  public Status read(String table, String key, Set<String> fields,
                     Map<String, ByteIterator> result) {
    try {
      PreparedStatement stmt = (fields == null) ? READ_ALL_STMT.get() : READ_STMTS.get(fields);

      // Prepare statement on demand
      if (stmt == null) {
        Select.Builder selectBuilder;

        if (fields == null) {
          selectBuilder = QueryBuilder.select().all();
        } else {
          selectBuilder = QueryBuilder.select();
          for (String col : fields) {
            ((Select.Selection) selectBuilder).column(col);
          }
        }

        stmt = session.prepare(selectBuilder.from(table)
            .where(QueryBuilder.eq(YCSB_KEY, QueryBuilder.bindMarker()))
            .limit(1));
        stmt.setConsistencyLevel(readConsistencyLevel);
        if (trace) {
          stmt.enableTracing();
        }

        PreparedStatement prevStmt = (fields == null) ?
            READ_ALL_STMT.getAndSet(stmt) :
            READ_STMTS.putIfAbsent(new HashSet<>(fields), stmt);
        if (prevStmt != null) {
          stmt = prevStmt;
        }
      }

      LOGGER.debug(stmt.getQueryString());
      LOGGER.debug("key = {}", key);

      ResultSet rs = session.execute(stmt.bind(key));

      if (rs.isExhausted()) {
        return Status.NOT_FOUND;
      }

      // Should be only 1 row
      Row row = rs.one();
      ColumnDefinitions cd = row.getColumnDefinitions();

      for (ColumnDefinitions.Definition def : cd) {
        ByteBuffer val = row.getBytesUnsafe(def.getName());
        if (val != null) {
          result.put(def.getName(), new ByteArrayByteIterator(val.array()));
        } else {
          result.put(def.getName(), null);
        }
      }

      return Status.OK;

    } catch (Exception e) {
      LOGGER.error(MessageFormatter.format("Error reading key: {}", key).getMessage(), e);
      return Status.ERROR;
    }

  }