protected DataInput walGetData(long offset, int segment) {
if (CC.ASSERT && offset % 16 != 0) throw new DBException.DataCorruption();
long longval = uncommittedDataLongs[segment].get(offset);
if (longval == 0) {
longval = committedDataLongs[segment].get(offset);
}
if (longval == 0) return null;
return wal.walGetByteArray(longval);
}
/** return positions of (possibly) linked record */
@Override
protected long[] offsetsGet(int segment, long indexVal) {
;
if (indexVal >>> 48 == 0) {
return ((indexVal & MLINKED) != 0) ? null : StoreDirect.EMPTY_LONGS;
}
long[] ret = new long[] {indexVal};
while ((ret[ret.length - 1] & MLINKED) != 0) {
ret = Arrays.copyOf(ret, ret.length + 1);
long oldLink = ret[ret.length - 2] & MOFFSET;
// get WAL position from current transaction, or previous (not yet fully replayed)
// transactions
long val = uncommittedDataLongs[segment].get(oldLink);
if (val == 0) val = committedDataLongs[segment].get(oldLink);
if (val != 0) {
// //was found in previous position, read link from WAL
// int file = (int) ((val>>>32) & 0xFFFFL); // get WAL file number
// val = val & 0xFFFFFFFFL; // convert to WAL offset;
// val = volumes.get(file).getLong(val);
try {
val = wal.walGetByteArray(val).readLong();
} catch (IOException e) {
throw new DBException.VolumeIOError(e);
}
} else {
// was not found in any transaction, read from main store
val = vol.getLong(oldLink);
}
ret[ret.length - 1] = parity3Get(val);
}
if (CC.ASSERT) {
offsetsVerify(ret);
}
if (CC.LOG_STORE && LOG.isLoggable(Level.FINEST)) {
LOG.log(
Level.FINEST,
"indexVal={0}, ret={1}",
new Object[] {Long.toHexString(indexVal), Arrays.toString(ret)});
}
return ret;
}