public void close() {
if (shuttingDown.getAndSet(true)) {
return;
}
mutex.lock();
try {
while (backgroundCompaction != null) {
backgroundCondition.awaitUninterruptibly();
}
} finally {
mutex.unlock();
}
compactionExecutor.shutdown();
try {
compactionExecutor.awaitTermination(1, TimeUnit.DAYS);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
try {
versions.destroy();
} catch (IOException ignored) {
}
try {
log.close();
} catch (IOException ignored) {
}
tableCache.close();
dbLock.release();
}
private void finishCompactionOutputFile(CompactionState compactionState) throws IOException {
Preconditions.checkNotNull(compactionState, "compactionState is null");
Preconditions.checkArgument(compactionState.outfile != null);
Preconditions.checkArgument(compactionState.builder != null);
long outputNumber = compactionState.currentFileNumber;
Preconditions.checkArgument(outputNumber != 0);
long currentEntries = compactionState.builder.getEntryCount();
compactionState.builder.finish();
long currentBytes = compactionState.builder.getFileSize();
compactionState.currentFileSize = currentBytes;
compactionState.totalBytes += currentBytes;
FileMetaData currentFileMetaData =
new FileMetaData(
compactionState.currentFileNumber,
compactionState.currentFileSize,
compactionState.currentSmallest,
compactionState.currentLargest);
compactionState.outputs.add(currentFileMetaData);
compactionState.builder = null;
compactionState.outfile.force(true);
compactionState.outfile.close();
compactionState.outfile = null;
if (currentEntries > 0) {
// Verify that the table is usable
tableCache.newIterator(outputNumber);
}
}
private void deleteObsoleteFiles() {
Preconditions.checkState(mutex.isHeldByCurrentThread());
// Make a set of all of the live files
List<Long> live = newArrayList(this.pendingOutputs);
for (FileMetaData fileMetaData : versions.getLiveFiles()) {
live.add(fileMetaData.getNumber());
}
for (File file : Filename.listFiles(databaseDir)) {
FileInfo fileInfo = Filename.parseFileName(file);
if (fileInfo == null) continue;
long number = fileInfo.getFileNumber();
boolean keep = true;
switch (fileInfo.getFileType()) {
case LOG:
keep = ((number >= versions.getLogNumber()) || (number == versions.getPrevLogNumber()));
break;
case DESCRIPTOR:
// Keep my manifest file, and any newer incarnations'
// (in case there is a race that allows other incarnations)
keep = (number >= versions.getManifestFileNumber());
break;
case TABLE:
keep = live.contains(number);
break;
case TEMP:
// Any temp files that are currently being written to must
// be recorded in pending_outputs_, which is inserted into "live"
keep = live.contains(number);
break;
case CURRENT:
case DB_LOCK:
case INFO_LOG:
keep = true;
break;
}
if (!keep) {
if (fileInfo.getFileType() == FileType.TABLE) {
tableCache.evict(number);
}
// todo info logging system needed
// Log(options_.info_log, "Delete type=%d #%lld\n",
// int(type),
// static_cast < unsigned long long>(number));
file.delete();
}
}
}
private FileMetaData buildTable(SeekingIterable<InternalKey, Slice> data, long fileNumber)
throws IOException {
File file = new File(databaseDir, Filename.tableFileName(fileNumber));
try {
InternalKey smallest = null;
InternalKey largest = null;
FileChannel channel = new FileOutputStream(file).getChannel();
try {
TableBuilder tableBuilder =
new TableBuilder(options, channel, new InternalUserComparator(internalKeyComparator));
for (Entry<InternalKey, Slice> entry : data) {
// update keys
InternalKey key = entry.getKey();
if (smallest == null) {
smallest = key;
}
largest = key;
tableBuilder.add(key.encode(), entry.getValue());
}
tableBuilder.finish();
} finally {
try {
channel.force(true);
} finally {
channel.close();
}
}
if (smallest == null) {
return null;
}
FileMetaData fileMetaData = new FileMetaData(fileNumber, file.length(), smallest, largest);
// verify table can be opened
tableCache.newIterator(fileMetaData);
pendingOutputs.remove(fileNumber);
return fileMetaData;
} catch (IOException e) {
file.delete();
throw e;
}
}