@Override
public void compact() {
if (readOnly) throw new IllegalAccessError();
final File indexFile = index.getFile();
final File physFile = phys.getFile();
final int rafMode;
if (index instanceof Volume.FileChannelVol) {
rafMode = 2;
} else if (index instanceof Volume.MappedFileVol && phys instanceof Volume.FileChannelVol) {
rafMode = 1;
} else {
rafMode = 0;
}
lockAllWrite();
try {
final File compactedFile =
new File(
(indexFile != null ? indexFile : File.createTempFile("mapdb", "compact"))
+ ".compact");
Volume.Factory fab =
Volume.fileFactory(compactedFile, rafMode, false, sizeLimit, CC.VOLUME_SLICE_SHIFT, 0);
StoreDirect store2 =
new StoreDirect(fab, false, false, 5, false, 0L, checksum, compress, password, false, 0);
compactPreUnderLock();
index.putLong(IO_PHYS_SIZE, physSize);
index.putLong(IO_INDEX_SIZE, indexSize);
index.putLong(IO_FREE_SIZE, freeSize);
// create secondary files for compaction
store2.lockAllWrite();
// transfer stack of free recids
// TODO long stack take modifies the original store
for (long recid = longStackTake(IO_FREE_RECID, false);
recid != 0;
recid = longStackTake(IO_FREE_RECID, false)) {
store2.longStackPut(IO_FREE_RECID, recid, false);
}
// iterate over recids and transfer physical records
store2.index.putLong(IO_INDEX_SIZE, indexSize);
for (long ioRecid = IO_USER_START; ioRecid < indexSize; ioRecid += 8) {
byte[] bb = get2(ioRecid, Serializer.BYTE_ARRAY_NOSIZE);
store2.index.ensureAvailable(ioRecid + 8);
if (bb == null || bb.length == 0) {
store2.index.putLong(ioRecid, 0);
} else {
DataIO.DataOutputByteArray out = serialize(bb, Serializer.BYTE_ARRAY_NOSIZE);
long[] indexVals = store2.physAllocate(out.pos, true, false);
store2.put2(out, ioRecid, indexVals);
}
}
File indexFile2 = store2.index.getFile();
File physFile2 = store2.phys.getFile();
store2.unlockAllWrite();
final boolean useDirectBuffer =
index instanceof Volume.MemoryVol && ((Volume.MemoryVol) index).useDirectBuffer;
index.sync(); // TODO is sync needed here?
index.close();
index = null;
phys.sync(); // TODO is sync needed here?
phys.close();
phys = null;
if (indexFile != null) {
final long time = System.currentTimeMillis();
final File indexFile_ =
indexFile != null ? new File(indexFile.getPath() + "_" + time + "_orig") : null;
final File physFile_ =
physFile != null ? new File(physFile.getPath() + "_" + time + "_orig") : null;
store2.close();
// not in memory, so just rename files
if (!indexFile.renameTo(indexFile_)) throw new AssertionError("could not rename file");
if (!physFile.renameTo(physFile_)) throw new AssertionError("could not rename file");
if (!indexFile2.renameTo(indexFile)) throw new AssertionError("could not rename file");
// TODO process may fail in middle of rename, analyze sequence and add recovery
if (!physFile2.renameTo(physFile)) throw new AssertionError("could not rename file");
final Volume.Factory fac2 =
Volume.fileFactory(indexFile, rafMode, false, sizeLimit, CC.VOLUME_SLICE_SHIFT, 0);
index = fac2.createIndexVolume();
phys = fac2.createPhysVolume();
indexFile_.delete();
physFile_.delete();
} else {
// in memory, so copy files into memory
Volume indexVol2 = new Volume.MemoryVol(useDirectBuffer, sizeLimit, CC.VOLUME_SLICE_SHIFT);
Volume.volumeTransfer(indexSize, store2.index, indexVol2);
Volume physVol2 = new Volume.MemoryVol(useDirectBuffer, sizeLimit, CC.VOLUME_SLICE_SHIFT);
Volume.volumeTransfer(store2.physSize, store2.phys, physVol2);
store2.close();
index = indexVol2;
phys = physVol2;
}
physSize = store2.physSize;
freeSize = store2.freeSize;
index.putLong(IO_PHYS_SIZE, physSize);
index.putLong(IO_INDEX_SIZE, indexSize);
index.putLong(IO_FREE_SIZE, freeSize);
index.putLong(IO_INDEX_SUM, indexHeaderChecksum());
maxUsedIoList = IO_USER_START - 8;
while (index.getLong(maxUsedIoList) != 0 && maxUsedIoList > IO_FREE_RECID) maxUsedIoList -= 8;
compactPostUnderLock();
} catch (IOException e) {
throw new IOError(e);
} finally {
unlockAllWrite();
}
}
@After
public void close() {
engine.close();
}