@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
protected void indexLongPut(long offset, long val) {
if (CC.ASSERT && !structuralLock.isHeldByCurrentThread()) throw new AssertionError();
wal.walPutLong(offset, val);
}