/** Write the cursor state to the map in cassandra */
private void writeCursorState(final String jobId, final EdgeScope edge) {
final JsonNode node =
EdgeScopeSerializer.INSTANCE.toNode(CursorSerializerUtil.getMapper(), edge);
final String serializedState = CursorSerializerUtil.asString(node);
mapManager.putString(jobId + MAP_CURSOR_KEY, serializedState, INDEX_TTL);
}
/** Swap our cursor for an optional edgescope */
private Optional<EdgeScope> parseCursor(final Optional<String> cursor) {
if (!cursor.isPresent()) {
return Optional.absent();
}
// get our cursor
final String persistedCursor = mapManager.getString(cursor.get());
if (persistedCursor == null) {
return Optional.absent();
}
final JsonNode node = CursorSerializerUtil.fromString(persistedCursor);
final EdgeScope edgeScope =
EdgeScopeSerializer.INSTANCE.fromJsonNode(node, CursorSerializerUtil.getMapper());
return Optional.of(edgeScope);
}