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package org.hsqldb.persist;
import java.io.IOException;
import org.hsqldb.HsqlException;
import org.hsqldb.Row;
import org.hsqldb.RowAVL;
import org.hsqldb.RowAVLDisk;
import org.hsqldb.RowAction;
import org.hsqldb.Session;
import org.hsqldb.TableBase;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.index.Index;
import org.hsqldb.index.IndexAVL;
import org.hsqldb.index.NodeAVL;
import org.hsqldb.index.NodeAVLDisk;
import org.hsqldb.lib.ArrayUtil;
import org.hsqldb.navigator.RowIterator;
import org.hsqldb.rowio.RowInputInterface;
/*
* Implementation of PersistentStore for result sets.
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.3.0
* @since 1.9.0
*/
public class RowStoreAVLHybrid extends RowStoreAVL implements PersistentStore {
DataFileCache cache;
private int maxMemoryRowCount;
private boolean useDisk;
boolean isCached;
int rowIdSequence = 0;
public RowStoreAVLHybrid(Session session,
PersistentStoreCollection manager,
TableBase table, boolean diskBased) {
this.manager = manager;
this.table = table;
this.maxMemoryRowCount = session.getResultMemoryRowCount();
this.useDisk = diskBased;
if (maxMemoryRowCount == 0) {
this.useDisk = false;
}
if (table.getTableType() == TableBase.RESULT_TABLE) {
setTimestamp(session.getActionTimestamp());
}
// test code to force use of cache
/*
if (diskBased) {
this.maxMemoryRowCount = 0;
this.useDisk = true;
}
*/
//
resetAccessorKeys(session, table.getIndexList());
manager.setStore(table, this);
nullsList = new boolean[table.getColumnCount()];
}
public boolean isMemory() {
return !isCached;
}
public void setMemory(boolean mode) {
useDisk = !mode;
}
public synchronized int getAccessCount() {
return isCached ? cache.getAccessCount()
: 0;
}
public void set(CachedObject object) {}
public CachedObject get(long i) {
try {
if (isCached) {
return cache.get(i, this, false);
} else {
throw Error.runtimeError(ErrorCode.U_S0500,
"RowStoreAVLHybrid");
}
} catch (HsqlException e) {
return null;
}
}
public CachedObject get(long i, boolean keep) {
try {
if (isCached) {
return cache.get(i, this, keep);
} else {
throw Error.runtimeError(ErrorCode.U_S0500,
"RowStoreAVLHybrid");
}
} catch (HsqlException e) {
return null;
}
}
public CachedObject get(CachedObject object, boolean keep) {
try {
if (isCached) {
return cache.get(object, this, keep);
} else {
return object;
}
} catch (HsqlException e) {
return null;
}
}
public void add(Session session, CachedObject object, boolean tx) {
if (isCached) {
int size = object.getRealSize(cache.rowOut);
size += indexList.length * NodeAVLDisk.SIZE_IN_BYTE;
size = cache.rowOut.getStorageSize(size);
object.setStorageSize(size);
long pos = tableSpace.getFilePosition(size, false);
object.setPos(pos);
cache.add(object);
}
Object[] data = ((Row) object).getData();
for (int i = 0; i < nullsList.length; i++) {
if (data[i] == null) {
nullsList[i] = true;
}
}
}
public CachedObject get(RowInputInterface in) {
try {
if (isCached) {
return new RowAVLDisk(table, in);
}
} catch (HsqlException e) {
return null;
} catch (IOException e1) {
return null;
}
return null;
}
public CachedObject getNewCachedObject(Session session, Object object,
boolean tx) {
if (!isCached) {
if (useDisk && elementCount.get() >= maxMemoryRowCount) {
changeToDiskTable(session);
}
}
Row row;
if (isCached) {
row = new RowAVLDisk(table, (Object[]) object, this);
} else {
int id = rowIdSequence++;
row = new RowAVL(table, (Object[]) object, id, this);
}
add(session, row, tx);
return row;
}
public void indexRow(Session session, Row row) {
try {
row = (Row) get(row, true);
super.indexRow(session, row);
row.keepInMemory(false);
} catch (HsqlException e) {
throw e;
}
}
public void removeAll() {
if (!isCached) {
destroy();
}
elementCount.set(0);
ArrayUtil.fillArray(accessorList, null);
for (int i = 0; i < nullsList.length; i++) {
nullsList[i] = false;
}
}
public void remove(CachedObject object) {
if (isCached) {
cache.remove(object);
}
}
public void commitPersistence(CachedObject row) {}
public void commitRow(Session session, Row row, int changeAction,
int txModel) {
switch (changeAction) {
case RowAction.ACTION_DELETE :
remove(row);
break;
case RowAction.ACTION_INSERT :
break;
case RowAction.ACTION_INSERT_DELETE :
// INSERT + DELEETE
remove(row);
break;
case RowAction.ACTION_DELETE_FINAL :
delete(session, row);
remove(row);
break;
}
}
public void rollbackRow(Session session, Row row, int changeAction,
int txModel) {
switch (changeAction) {
case RowAction.ACTION_DELETE :
row = (Row) get(row, true);
((RowAVL) row).setNewNodes(this);
row.keepInMemory(false);
indexRow(session, row);
break;
case RowAction.ACTION_INSERT :
delete(session, row);
remove(row);
break;
case RowAction.ACTION_INSERT_DELETE :
// INSERT + DELEETE
remove(row);
break;
}
}
//
public DataFileCache getCache() {
return cache;
}
public void setCache(DataFileCache cache) {
throw Error.runtimeError(ErrorCode.U_S0500, "RowStoreAVLHybrid");
}
public void release() {
if (!isCached) {
destroy();
}
if (isCached) {
cache.adjustStoreCount(-1);
cache = null;
isCached = false;
}
manager.setStore(table, null);
elementCount.set(0);
ArrayUtil.fillArray(accessorList, null);
}
public void delete(Session session, Row row) {
super.delete(session, row);
}
public CachedObject getAccessor(Index key) {
NodeAVL node = (NodeAVL) accessorList[key.getPosition()];
if (node == null) {
return null;
}
RowAVL row = (RowAVL) get(node.getRow(this), false);
node = row.getNode(key.getPosition());
accessorList[key.getPosition()] = node;
return node;
}
public synchronized void resetAccessorKeys(Session session, Index[] keys) {
if (indexList.length == 0 || accessorList[0] == null) {
indexList = keys;
accessorList = new CachedObject[indexList.length];
return;
}
if (isCached) {
throw Error.runtimeError(ErrorCode.U_S0500, "RowStoreAVLHybrid");
}
super.resetAccessorKeys(session, keys);
}
public boolean hasNull(int pos) {
return nullsList[pos];
}
public final void changeToDiskTable(Session session) {
cache =
((PersistentStoreCollectionSession) manager).getSessionDataCache();
if (cache != null) {
tableSpace = cache.spaceManager.getTableSpace(
DataSpaceManager.tableIdDefault);
IndexAVL idx = (IndexAVL) indexList[0];
NodeAVL root = (NodeAVL) accessorList[0];
RowIterator iterator = table.rowIterator(this);
ArrayUtil.fillArray(accessorList, null);
elementCount.set(0);
isCached = true;
cache.adjustStoreCount(1);
while (iterator.hasNext()) {
Row row = iterator.getNextRow();
Row newRow = (Row) getNewCachedObject(session, row.getData(),
false);
indexRow(session, newRow);
}
idx.unlinkNodes(root);
}
maxMemoryRowCount = Integer.MAX_VALUE;
}
}