@Override
public void init() {
if (init) {
return;
}
init = true;
Store s = database.getMvStore();
MVStore mvStore;
if (s == null) {
// in-memory database
mvStore = MVStore.open(null);
} else {
mvStore = s.getStore();
}
lobMap = mvStore.openMap("lobMap");
refMap = mvStore.openMap("lobRef");
dataMap = mvStore.openMap("lobData");
streamStore = new StreamStore(dataMap);
// garbage collection of the last blocks
if (database.isReadOnly()) {
return;
}
if (dataMap.isEmpty()) {
return;
}
// search the last referenced block
// (a lob may not have any referenced blocks if data is kept inline,
// so we need to loop)
long lastUsedKey = -1;
Long lobId = lobMap.lastKey();
while (lobId != null) {
Object[] v = lobMap.get(lobId);
byte[] id = (byte[]) v[0];
lastUsedKey = streamStore.getMaxBlockKey(id);
if (lastUsedKey >= 0) {
break;
}
lobId = lobMap.lowerKey(lobId);
}
// delete all blocks that are newer
while (true) {
Long last = dataMap.lastKey();
if (last == null || last <= lastUsedKey) {
break;
}
dataMap.remove(last);
}
// don't re-use block ids, except at the very end
Long last = dataMap.lastKey();
if (last != null) {
streamStore.setNextKey(last + 1);
}
}
