/**
* Get the objects that have been cached.
*
* @return
*/
public Collection<? extends Cacheable> objectValues() {
Collection<Cacheable> objects = new ArrayList<Cacheable>();
for (CachedObject co : values()) {
objects.add((Cacheable) co.getValue());
}
return objects;
}
/**
* Reduces the number of rows held in this Cache object.
*
* <p>Cleanup is done by checking the accessCount of the Rows and removing the rows with the
* lowest access count.
*
* <p>Index operations require that up to 5 recently accessed rows remain in the cache.
*/
private synchronized void cleanUp() throws IOException {
int removeCount = cacheMap.size() / 2;
int accessTarget = cacheMap.getAccessCountCeiling(removeCount, removeCount / 8);
ObjectCacheHashMap.ObjectCacheIterator it = cacheMap.iterator();
int savecount = 0;
for (; it.hasNext(); ) {
CachedObject r = (CachedObject) it.next();
if (it.getAccessCount() <= accessTarget) {
if (!r.isKeepInMemory()) {
if (r.hasChanged()) {
rowTable[savecount++] = r;
}
it.remove();
cacheBytesLength -= r.getStorageSize();
}
}
}
cacheMap.setAccessCountFloor(accessTarget);
saveRows(savecount);
}
/**
* Used when a row is deleted as a result of some DML or DDL command. Adds the file space for the
* row to the list of free positions. If there exists more than MAX_FREE_COUNT free positions,
* then they are probably all too small, so we start a new list.
*
* <p>todo: This is wrong when deleting lots of records
*
* <p>Then remove the row from the cache data structures.
*/
public void remove(int i, PersistentStore store) throws HsqlException {
CachedObject r = release(i);
int size = r == null ? getStorageSize(i) : r.getStorageSize();
freeBlocks.add(i, size);
}
public boolean containsValue(Object value) {
if (null != value) {
for (CachedObject<V> cache : map.values()) {
if (value.equals(cache.get())) return true;
}
}
return false;
}
/**
* Writes out the specified Row. Will write only the Nodes or both Nodes and table row data
* depending on what is not already persisted to disk.
*/
private void saveRow(CachedObject row) throws IOException {
setFileModified();
rowOut.reset();
row.write(rowOut);
dataFile.seek((long) row.getPos() * cacheFileScale);
dataFile.write(rowOut.getOutputStream().getBuffer(), 0, rowOut.getOutputStream().size());
}
public V remove(Object key) {
CachedObject<V> cache = map.remove(key);
if (cache == null) {
return null;
}
V obj = cache.get();
return obj;
}
public void add(CachedObject object) {
int size = object.getRealSize(cache.rowOut);
size = cache.rowOut.getStorageSize(size);
object.setStorageSize(size);
cache.add(object);
}
public synchronized int getStorageSize(int i) throws IOException {
CachedObject value = cache.get(i);
if (value != null) {
return value.getStorageSize();
}
return readSize(i);
}
/**
* Convenience method to add an object with its key to the cache. This creates the CachedObject
* wrapper to manage its state. If the object already exists in the cache, it updates its value.
*
* @param cacheable
* @return
*/
public CachedObject add(Cacheable cacheable) {
Identifier key = cacheable.getIdentifier();
CachedObject co = get(key);
if (co == null) {
co = new CachedObject();
co.setKey(key.toString());
put(key, co);
}
co.setValue(cacheable);
return co;
}
public void updateObject(String name, Date date, X object) {
CachedObject<X> obj;
if (cache.containsKey(name)) {
obj = cache.get(name);
} else {
obj = new CachedObject<X>(name);
cache.put(name, obj);
}
obj.date = date;
obj.object = object;
}
/** Removes an object from memory cache. Does not release the file storage. */
public synchronized CachedObject release(int i) {
CachedObject r = (CachedObject) cacheMap.remove(i);
if (r == null) {
return null;
}
cacheBytesLength -= r.getStorageSize();
return r;
}
/**
* Store an object in the map. The object's timeout period will start from the current system
* time.
*/
public V put(K key, V value) {
CachedObject<V> cache = map.get(key);
if (cache == null) {
map.put(key, new CachedObject<V>(value, timeout));
return null;
}
V old = cache.get();
cache.set(value);
return old;
}
/** {@inheritDoc} */
@Override
public T get(K key) {
synchronized (cacheMap) {
CachedObject c = (CachedObject) cacheMap.get(key);
if (c == null) return null;
else {
c.lastAccessed = System.currentTimeMillis();
return c.value;
}
}
}
public void add(CachedObject object) throws IOException {
int size = object.getRealSize(rowOut);
size = ((size + cachedRowPadding - 1) / cachedRowPadding) * cachedRowPadding;
object.setStorageSize(size);
int i = setFilePos(object);
cache.put(i, object);
// for text tables
if (storeOnInsert) {
saveRow(object);
}
}
public synchronized int getStorageSize(int i) throws HsqlException {
try {
CachedObject value = cache.get(i);
if (value != null) {
return value.getStorageSize();
}
return readSize(i);
} catch (IOException e) {
database.logger.appLog.logContext(e);
throw Trace.error(
Trace.DATA_FILE_ERROR, Trace.DataFileCache_makeRow, new Object[] {e, fileName});
}
}
/**
* Using this rather than {@link #add} will let you cache anything you please, even objects (like
* connections to servers) that are not inherently {@link
* edu.uiuc.ncsa.security.core.Identifiable}.
*
* @param key
* @param value
* @return
*/
public CachedObject put(Identifier key, CachedObject value) {
// issue is that the sorted list is a list -- adding the same cached value
// repeatedly will result in duplicates. The real cache vets these by key.
// It is entirely possible that a user will add a new cached object that will replace
// a currently cached object, effectively changing how the retention policy will work with
// it.
CachedObject oldCO = getTheRealCache().get(key);
if (oldCO == null) {
// it's new
getTheRealCache().put(key, value);
getSortedList().add(value);
} else {
oldCO.setTimestamp(value.getTimestamp());
}
return oldCO;
}
/**
* For a CacheObject that had been previously released from the cache. A new version is
* introduced, using the preallocated space for the object.
*/
public void restore(CachedObject object) throws IOException {
int i = object.getPos();
cache.put(i, object);
// for text tables
if (storeOnInsert) {
saveRow(object);
}
}
/**
* For a CacheObject that had been previously released from the cache. A new version is
* introduced, using the preallocated space for the object.
*/
public synchronized void restore(CachedObject object) throws IOException {
int i = object.getPos();
cache.put(i, object);
// was previously used for text tables
if (storeOnInsert) {
saveRow(object);
}
}
/** Writes out all modified cached Rows. */
public synchronized void saveAll() throws IOException {
Iterator it = cacheMap.iterator();
int savecount = 0;
for (; it.hasNext(); ) {
CachedObject r = (CachedObject) it.next();
if (r.hasChanged()) {
rowTable[savecount++] = r;
}
}
saveRows(savecount);
Trace.printSystemOut(saveAllTimer.elapsedTimeToMessage("Cache.saveRow() total row save time"));
Trace.printSystemOut("Cache.saveRow() total row save count = " + saveRowCount);
Trace.printSystemOut(makeRowTimer.elapsedTimeToMessage("Cache.makeRow() total row load time"));
Trace.printSystemOut("Cache.makeRow() total row load count = " + makeRowCount);
Trace.printSystemOut(sortTimer.elapsedTimeToMessage("Cache.sort() total time"));
}
/**
* Allocates file space for the row.
*
* <p>A Row is added by walking the list of CacheFree objects to see if there is available space
* to store it, reusing space if it exists. Otherwise the file is grown to accommodate it.
*/
private int setFilePos(CachedObject r) throws IOException {
int rowSize = r.getStorageSize();
int i = freeBlocks == null ? -1 : freeBlocks.get(rowSize);
if (i == -1) {
i = (int) (fileFreePosition / cacheFileScale);
long newFreePosition = fileFreePosition + rowSize;
if (newFreePosition > maxDataFileSize) {
throw new IOException(Trace.getMessage(Trace.DATA_FILE_IS_FULL));
}
fileFreePosition = newFreePosition;
}
r.setPos(i);
return i;
}
/** Adds a row to the cache. */
public synchronized void put(int key, CachedObject row) throws IOException {
int storageSize = row.getStorageSize();
if (cacheMap.size() >= capacity || storageSize + cacheBytesLength > bytesCapacity) {
cleanUp();
}
cacheMap.put(key, row);
cacheBytesLength += storageSize;
}
public synchronized CachedObject get(int i, PersistentStore store, boolean keep)
throws HsqlException {
if (i < 0) {
return null;
}
try {
CachedObject object = cache.get(i);
if (object == null) {
RowInputInterface rowInput = readObject(i);
if (rowInput == null) {
return null;
}
object = store.get(rowInput);
// for text tables with empty rows at the beginning,
// pos may move forward in readObject
i = object.getPos();
cache.put(i, object);
}
if (keep) {
object.keepInMemory(true);
}
return object;
} catch (IOException e) {
database.logger.appLog.logContext(SimpleLog.LOG_ERROR, fileName + " get pos: " + i);
database.logger.appLog.logContext(e);
throw Trace.error(
Trace.DATA_FILE_ERROR, Trace.DataFileCache_makeRow, new Object[] {e, fileName});
}
}
public synchronized CachedObject get(int i, PersistentStore store, boolean keep)
throws HsqlException {
if (i < 0) {
return null;
}
try {
CachedObject value = cache.get(i);
if (value == null) {
boolean result = readObject(i);
if (!result) {
return null;
}
value = store.get(rowIn);
value.setPos(i);
cache.put(i, value);
}
if (keep) {
value.keepInMemory(true);
}
return value;
} catch (IOException e) {
database.logger.appLog.logContext("" + cache + " pos: " + i);
database.logger.appLog.logContext(e);
throw Trace.error(
Trace.DATA_FILE_ERROR, Trace.DataFileCache_makeRow, new Object[] {e, fileName});
}
}
public CachedObject get(CachedObject object, boolean keep) {
return (CachedObject) rowIdMap.get(object.getPos());
}
int[] writeTableToDataFile(Table table) throws IOException {
Session session = database.getSessionManager().getSysSession();
PersistentStore store = session.sessionData.getRowStore(table);
RowOutputInterface rowOut = new RowOutputBinary(1024, scale);
DoubleIntIndex pointerLookup =
new DoubleIntIndex(table.getPrimaryIndex().sizeEstimate(store), false);
int[] rootsArray = table.getIndexRootsArray();
long pos = fileOffset;
int count = 0;
pointerLookup.setKeysSearchTarget();
Error.printSystemOut("lookup begins: " + stopw.elapsedTime());
RowIterator it = table.rowIterator(session);
for (; it.hasNext(); count++) {
CachedObject row = it.getNextRow();
pointerLookup.addUnsorted(row.getPos(), (int) (pos / scale));
if (count % 50000 == 0) {
Error.printSystemOut("pointer pair for row " + count + " " + row.getPos() + " " + pos);
}
pos += row.getStorageSize();
}
Error.printSystemOut(table.getName().name + " list done: " + stopw.elapsedTime());
count = 0;
it = table.rowIterator(session);
for (; it.hasNext(); count++) {
CachedObject row = it.getNextRow();
rowOut.reset();
row.write(rowOut, pointerLookup);
fileStreamOut.write(rowOut.getOutputStream().getBuffer(), 0, rowOut.size());
fileOffset += row.getStorageSize();
if ((count) % 50000 == 0) {
Error.printSystemOut(count + " rows " + stopw.elapsedTime());
}
}
for (int i = 0; i < rootsArray.length; i++) {
if (rootsArray[i] == -1) {
continue;
}
int lookupIndex = pointerLookup.findFirstEqualKeyIndex(rootsArray[i]);
if (lookupIndex == -1) {
throw Error.error(ErrorCode.DATA_FILE_ERROR);
}
rootsArray[i] = pointerLookup.getValue(lookupIndex);
}
setTransactionRowLookups(pointerLookup);
Error.printSystemOut(table.getName().name + " : table converted");
return rootsArray;
}
public void put(CachedObject co) {
put(new BasicIdentifier(co.getKey()), co);
}