/**
* Disable the cursors opened on the head log file log, by closing their underlying cursor.
* Returns the state of each cursor just before the close operation.
*
* @return the pairs (cursor, cursor state) for each cursor pointing to head log file.
* @throws ChangelogException If an error occurs.
*/
private List<Pair<AbortableLogCursor<K, V>, CursorState<K, V>>> disableOpenedCursorsOnHead()
throws ChangelogException {
final List<Pair<AbortableLogCursor<K, V>, CursorState<K, V>>> openCursorsStates =
new ArrayList<>();
final LogFile<K, V> headLogFile = getHeadLogFile();
for (AbortableLogCursor<K, V> cursor : openCursors) {
if (cursor.isAccessingLogFile(headLogFile)) {
openCursorsStates.add(Pair.of(cursor, cursor.getState()));
cursor.closeUnderlyingCursor();
}
}
return openCursorsStates;
}
/**
* Returns the key bounds for the provided log file.
*
* @return the pair of (lowest key, highest key) that correspond to records stored in the
* corresponding log file.
* @throws ChangelogException if an error occurs while retrieving the keys
*/
private Pair<K, K> getKeyBounds(final LogFile<K, V> logFile) throws ChangelogException {
try {
final String name = logFile.getFile().getName();
final String[] keys =
name.substring(0, name.length() - Log.LOG_FILE_SUFFIX.length())
.split(LOG_FILE_NAME_SEPARATOR);
return Pair.of(
recordParser.decodeKeyFromString(keys[0]), recordParser.decodeKeyFromString(keys[1]));
} catch (Exception e) {
throw new ChangelogException(
ERR_CHANGELOG_UNABLE_TO_RETRIEVE_KEY_BOUNDS_FROM_FILE.get(logFile.getFile().getPath()),
e);
}
}
/**
* Adds listeners for service names that match the provided predicate.
*
* @param l Listener to be added.
* @param servicePredicate The predicate.
*/
public void addServiceListener(ConfigurationListener l, Predicate<String> servicePredicate) {
serviceListeners.add(Pair.of(l, servicePredicate));
}
/**
* Adds listener for all services.
*
* @param l Listener to be added.
*/
public void addListener(ConfigurationListener l) {
serviceListeners.add(Pair.<ConfigurationListener, Predicate<String>>of(l, null));
}