/**
* Return the SyncStamp - the value used to determine the end of the current
* sync range. If the collection backend supports modification sequences,
* we will use that, otherwise return the current timestamp.
*
* @param string $collection The collection id we are currently requesting.
* @param integer $last The last syncstamp, if known. Used to help
* sanity check the state.
*
* @return integer|boolean The SyncStamp or false if an error is encountered.
* @since 2.6.0
*/
public function getSyncStamp($collection, $last = null)
{
$this->_logger->info(sprintf('[%s] Horde_Core_ActiveSync_Driver::getSyncStamp(%s, %d);', getmypid(), $collection, $last));
// For FolderSync (empty $collection) or Email collections, we don't care.
if (empty($collection)) {
return time();
}
$parts = $this->_parseFolderId($collection);
if (is_array($parts)) {
$class = $parts[self::FOLDER_PART_CLASS];
$id = $parts[self::FOLDER_PART_ID];
} else {
$class = $parts;
$id = null;
}
if (!in_array($class, array(Horde_ActiveSync::CLASS_CALENDAR, Horde_ActiveSync::CLASS_NOTES, Horde_ActiveSync::CLASS_CONTACTS, Horde_ActiveSync::CLASS_TASKS))) {
return time();
}
if ($this->_connector->hasFeature('modseq', $this->_classMap[$class])) {
$modseq = $this->_connector->getHighestModSeq($this->_classMap[$class], $id);
// Sanity check - if the last syncstamp is higher then the
// current modification sequence, something is wrong. Could be
// the history backend just happend to have deleted the most recent
// entry or (more likely) we are transitioning from using
// timestamps to using sequences. In this case the difference would
// be VERY large, so try to detect that.
if (!empty($last) && $last > $modseq && $last - $modseq > 1000000000) {
return false;
}
return intval($modseq);
}
return time();
}
