Struct EnvironmentLogScanner 

pub struct EnvironmentLogScanner { /* private fields */ }

LogScanner implementation backed by the live EnvironmentImpl.

Scans the log forward from an LSN cursor, returning entries that carry a VLSN >= from_vlsn. On each call to next_entry the scanner advances its internal file/offset position one entry at a time; when it reaches the current end of the log it returns None (the FeederRunner will call again after a brief poll interval).

Implementations

impl EnvironmentLogScanner

pub fn new(env: &EnvironmentImpl, start_lsn: Option<Lsn>) -> Option<Self>

Create a scanner that starts at start_lsn.

If start_lsn is NULL_LSN the scanner begins at the very first log entry in file 0. The correct first-entry offset is resolved from file 0’s log_version (32 for v2, 36 for v3). If file 0 does not exist yet (empty log) the current-version default (36) is used.

Obtain the FileManager from EnvironmentImpl::get_log_manager() → LogManager is not directly accessible, but EnvironmentImpl exposes a get_log_manager() returning Option<Arc<LogManager>>. For the scanner we need the FileManager underneath it; the simplest approach is to construct the scanner directly from a FileManager Arc.

Trait Implementations

impl LogScanner for EnvironmentLogScanner

fn next_entry(&mut self, from_vlsn: u64) -> Option<(u64, u8, Vec<u8>)>

Return the next entry with VLSN >= from_vlsn, advancing the cursor.

Scans forward one entry at a time. Returns None when the cursor reaches the end of the currently-written log. The feeder will sleep briefly and call again.