@Override
public void close() {
commitLock.lock();
try {
if (closed) {
return;
}
if (hasUncommitedData()) {
LOG.warning("Closing storage with uncommited data, this data will be discarded.");
}
headVol.putData(0, headVolBackup, 0, headVolBackup.length);
if (!readonly) {
replaySoft();
wal.destroyWalFiles();
}
wal.close();
vol.close();
vol = null;
headVol.close();
headVol = null;
headVolBackup = null;
uncommittedStackPages.clear();
if (caches != null) {
for (Cache c : caches) {
c.close();
}
Arrays.fill(caches, null);
}
if (fileLockHeartbeat != null) {
fileLockHeartbeat.unlock();
fileLockHeartbeat = null;
}
closed = true;
} finally {
commitLock.unlock();
}
}
@Override
public void commit() {
commitLock.lock();
try {
// flush write caches into write ahead log
flushWriteCache();
// move uncommited data to committed
for (int segment = 0; segment < locks.length; segment++) {
locks[segment].writeLock().lock();
try {
// dump index vals into WAL
long[] table = uncommittedIndexTable[segment].table;
for (int i = 0; i < table.length; ) {
long offset = table[i++];
long val = table[i++];
if (offset == 0) continue;
wal.walPutLong(offset, val);
}
moveAndClear(uncommittedIndexTable[segment], committedIndexTable[segment]);
moveAndClear(uncommittedDataLongs[segment], committedDataLongs[segment]);
} finally {
locks[segment].writeLock().unlock();
}
}
structuralLock.lock();
try {
// flush modified Long Stack pages into WAL
long[] set = uncommittedStackPages.set;
longStackPagesLoop:
for (int i = 0; i < set.length; i++) {
long offset = set[i];
if (offset == 0) continue longStackPagesLoop;
byte[] val = (byte[]) uncommittedStackPages.values[i];
if (val == LONG_STACK_PAGE_TOMBSTONE) committedPageLongStack.put(offset, -1);
else {
if (CC.ASSERT) assertLongStackPage(offset, val);
long walPointer = wal.walPutByteArray(offset, val, 0, val.length);
committedPageLongStack.put(offset, walPointer);
}
}
uncommittedStackPages.clear();
// update checksum
headVol.putInt(HEAD_CHECKSUM, headChecksum(headVol));
// take backup of headVol
headVol.getData(0, headVolBackup, 0, headVolBackup.length);
wal.walPutByteArray(0, headVolBackup, 0, headVolBackup.length);
wal.commit();
wal.seal();
replaySoft();
realVol.sync();
wal.destroyWalFiles();
} finally {
structuralLock.unlock();
}
} finally {
commitLock.unlock();
}
}
@Override
public void initOpen() {
// TODO disable readonly feature for this store
realVol = vol;
if (readonly && !Volume.isEmptyFile(fileName + ".wal.0"))
throw new DBException.WrongConfig(
"There is dirty WAL file, but storage is read-only. Can not replay file");
wal.open(
new WriteAheadLog.WALReplay() {
@Override
public void beforeReplayStart() {}
@Override
public void writeLong(long offset, long value) {
if (CC.ASSERT && offset % 8 != 0) throw new AssertionError();
realVol.ensureAvailable(Fun.roundUp(offset + 8, StoreDirect.PAGE_SIZE));
realVol.putLong(offset, value);
}
@Override
public void writeRecord(long recid, long walId, Volume vol, long volOffset, int length) {
throw new DBException.DataCorruption();
}
@Override
public void writeByteArray(
long offset, long walId, Volume vol, long volOffset, int length) {
if (CC.ASSERT && offset % 8 != 0) throw new AssertionError();
realVol.ensureAvailable(Fun.roundUp(offset + length, StoreDirect.PAGE_SIZE));
vol.transferInto(volOffset, realVol, offset, length);
}
@Override
public void beforeDestroyWAL() {}
@Override
public void commit() {}
@Override
public void rollback() {
throw new DBException.DataCorruption();
}
@Override
public void writeTombstone(long recid) {
throw new DBException.DataCorruption();
}
@Override
public void writePreallocate(long recid) {
throw new DBException.DataCorruption();
}
});
realVol.sync();
wal.destroyWalFiles();
initOpenPost();
// TODO reenable this assertion
// if(CC.PARANOID)
// storeCheck();
}
