ReaderCommit(SegmentInfos infos, Directory dir) throws IOException {
segmentsFileName = infos.getCurrentSegmentFileName();
this.dir = dir;
userData = infos.getUserData();
files = Collections.unmodifiableCollection(infos.files(dir, true));
version = infos.getVersion();
generation = infos.getGeneration();
segmentCount = infos.size();
}
/**
* Commit changes resulting from delete, undeleteAll, or setNorm operations
*
* <p>If an exception is hit, then either no changes or all changes will have been committed to
* the index (transactional semantics).
*
* @throws IOException if there is a low-level IO error
*/
@Override
protected void doCommit(Map<String, String> commitUserData) throws IOException {
if (hasChanges) {
segmentInfos.setUserData(commitUserData);
// Default deleter (for backwards compatibility) is
// KeepOnlyLastCommitDeleter:
IndexFileDeleter deleter =
new IndexFileDeleter(
directory,
deletionPolicy == null ? new KeepOnlyLastCommitDeletionPolicy() : deletionPolicy,
segmentInfos,
null,
null);
segmentInfos.updateGeneration(deleter.getLastSegmentInfos());
segmentInfos.changed();
// Checkpoint the state we are about to change, in
// case we have to roll back:
startCommit();
final List<SegmentInfo> rollbackSegments = segmentInfos.createBackupSegmentInfos(false);
boolean success = false;
try {
for (int i = 0; i < subReaders.length; i++) subReaders[i].commit();
// Remove segments that contain only 100% deleted
// docs:
segmentInfos.pruneDeletedSegments();
// Sync all files we just wrote
directory.sync(segmentInfos.files(directory, false));
segmentInfos.commit(directory);
success = true;
} finally {
if (!success) {
// Rollback changes that were made to
// SegmentInfos but failed to get [fully]
// committed. This way this reader instance
// remains consistent (matched to what's
// actually in the index):
rollbackCommit();
// Recompute deletable files & remove them (so
// partially written .del files, etc, are
// removed):
deleter.refresh();
// Restore all SegmentInfos (in case we pruned some)
segmentInfos.rollbackSegmentInfos(rollbackSegments);
}
}
// Have the deleter remove any now unreferenced
// files due to this commit:
deleter.checkpoint(segmentInfos, true);
deleter.close();
maxIndexVersion = segmentInfos.getVersion();
if (writeLock != null) {
writeLock.release(); // release write lock
writeLock = null;
}
}
hasChanges = false;
}