/** * Empties the log, discarding all records it contains. * * <p>All cursors open on the log are aborted. * * @throws ChangelogException If cursors are opened on this log, or if a problem occurs during * clearing operation. */ public void clear() throws ChangelogException { exclusiveLock.lock(); try { if (isClosed) { return; } if (!openCursors.isEmpty()) { // All open cursors are aborted, which means the change number indexer thread // should manage AbortedChangelogCursorException specifically to avoid being // stopped abortAllOpenCursors(); } // delete all log files final List<String> undeletableFiles = new ArrayList<>(); for (LogFile<K, V> logFile : logFiles.values()) { try { logFile.close(); logFile.delete(); } catch (ChangelogException e) { undeletableFiles.add(logFile.getFile().getPath()); } } if (!undeletableFiles.isEmpty()) { throw new ChangelogException( ERR_CHANGELOG_UNABLE_TO_DELETE_LOG_FILE.get( Utils.joinAsString(", ", undeletableFiles))); } logFiles.clear(); // recreate an empty head log file openHeadLogFile(); } catch (Exception e) { throw new ChangelogException( ERR_ERROR_CLEARING_DB.get(logPath.getPath(), stackTraceToSingleLineString(e))); } finally { exclusiveLock.unlock(); } }