@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); } }
/** * Get the largest key that is smaller than the given key, or null if no such key exists. * * @param key the key (may not be null) * @return the result */ public K lowerKey(K key) { // TODO Auto-generated method stub return map.lowerKey(key); }