/* Copyright (c) 2001-2010, The HSQL Development Group
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package org.hsqldb;
import org.hsqldb.lib.DoubleIntIndex;
import org.hsqldb.persist.CachedObject;
import org.hsqldb.persist.PersistentStore;
/**
* Manages rows involved in transactions
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.0.0
* @since 2.0.0
*/
public class TransactionManager2PL extends TransactionManagerCommon
implements TransactionManager {
public TransactionManager2PL(Database db) {
database = db;
hasPersistence = database.logger.isLogged();
lobSession = database.sessionManager.getSysLobSession();
txModel = LOCKS;
}
public long getGlobalChangeTimestamp() {
return globalChangeTimestamp.get();
}
public boolean isMVRows() {
return false;
}
public int getTransactionControl() {
return LOCKS;
}
public void setTransactionControl(Session session, int mode) {
writeLock.lock();
try {
switch (mode) {
case MVCC : {
TransactionManagerMVCC manager =
new TransactionManagerMVCC(database);
manager.globalChangeTimestamp.set(
globalChangeTimestamp.get());
manager.liveTransactionTimestamps.addLast(
session.transactionTimestamp);
database.txManager = manager;
break;
}
case MVLOCKS : {
TransactionManagerMV2PL manager =
new TransactionManagerMV2PL(database);
manager.globalChangeTimestamp.set(
globalChangeTimestamp.get());
manager.liveTransactionTimestamps.addLast(
session.transactionTimestamp);
database.txManager = manager;
break;
}
case LOCKS :
break;
}
return;
} finally {
writeLock.unlock();
}
}
public void completeActions(Session session) {
endActionTPL(session);
}
public boolean prepareCommitActions(Session session) {
session.actionTimestamp = nextChangeTimestamp();
return true;
}
public boolean commitTransaction(Session session) {
if (session.abortTransaction) {
return false;
}
int limit = session.rowActionList.size();
Object[] list = session.rowActionList.getArray();
writeLock.lock();
try {
endTransaction(session);
// new actionTimestamp used for commitTimestamp
session.actionTimestamp = nextChangeTimestamp();
for (int i = 0; i < limit; i++) {
RowAction action = (RowAction) list[i];
action.commit(session);
}
persistCommit(session, list, limit);
endTransactionTPL(session);
} finally {
writeLock.unlock();
}
session.tempSet.clear();
if (session != lobSession && lobSession.rowActionList.size() > 0) {
lobSession.isTransaction = true;
lobSession.actionIndex = lobSession.rowActionList.size();
lobSession.commit(false);
}
return true;
}
public void rollback(Session session) {
session.abortTransaction = false;
session.actionTimestamp = nextChangeTimestamp();
rollbackPartial(session, 0, session.transactionTimestamp);
endTransaction(session);
writeLock.lock();
try {
endTransactionTPL(session);
} finally {
writeLock.unlock();
}
}
public void rollbackSavepoint(Session session, int index) {
long timestamp = session.sessionContext.savepointTimestamps.get(index);
Integer oi = (Integer) session.sessionContext.savepoints.get(index);
int start = oi.intValue();
while (session.sessionContext.savepoints.size() > index + 1) {
session.sessionContext.savepoints.remove(
session.sessionContext.savepoints.size() - 1);
session.sessionContext.savepointTimestamps.removeLast();
}
rollbackPartial(session, start, timestamp);
}
public void rollbackAction(Session session) {
rollbackPartial(session, session.actionIndex, session.actionTimestamp);
endActionTPL(session);
}
/**
* rollback the row actions from start index in list and
* the given timestamp
*/
void rollbackPartial(Session session, int start, long timestamp) {
Object[] list = session.rowActionList.getArray();
int limit = session.rowActionList.size();
if (start == limit) {
return;
}
for (int i = limit - 1; i >= start; i--) {
RowAction action = (RowAction) list[i];
if (action == null || action.type == RowActionBase.ACTION_NONE
|| action.type == RowActionBase.ACTION_DELETE_FINAL) {
continue;
}
Row row = action.memoryRow;
if (row == null) {
row = (Row) action.store.get(action.getPos(), false);
}
if (row == null) {
continue;
}
action.rollback(session, timestamp);
int type = action.mergeRollback(session, timestamp, row);
action.store.rollbackRow(session, row, type, txModel);
}
session.rowActionList.setSize(start);
}
public RowAction addDeleteAction(Session session, Table table, Row row,
int[] colMap) {
RowAction action;
synchronized (row) {
action = RowAction.addDeleteAction(session, table, row, colMap);
}
session.rowActionList.add(action);
PersistentStore store = session.sessionData.getRowStore(table);
store.delete(session, row);
return action;
}
public void addInsertAction(Session session, Table table, Row row) {
RowAction action = row.rowAction;
if (action == null) {
System.out.println("null insert action " + session + " "
+ session.actionTimestamp);
}
session.rowActionList.add(action);
}
// functional unit - accessibility of rows
public boolean canRead(Session session, Row row, int mode, int[] colMap) {
return true;
}
public boolean canRead(Session session, int id, int mode) {
return true;
}
/**
* add transaction info to a row just loaded from the cache. called only
* for CACHED tables
*/
public void setTransactionInfo(CachedObject object) {}
public void removeTransactionInfo(CachedObject object) {}
public void beginTransaction(Session session) {
session.actionTimestamp = nextChangeTimestamp();
session.transactionTimestamp = session.actionTimestamp;
session.isTransaction = true;
transactionCount++;
}
/**
* add session to the end of queue when a transaction starts
* (depending on isolation mode)
*/
public void beginAction(Session session, Statement cs) {
if (session.hasLocks(cs)) {
return;
}
writeLock.lock();
try {
boolean canProceed = setWaitedSessionsTPL(session, cs);
if (canProceed) {
if (session.tempSet.isEmpty()) {
lockTablesTPL(session, cs);
// we don't set other sessions that would now be waiting for this one too
// next lock release will do it
} else {
setWaitingSessionTPL(session);
}
}
} finally {
writeLock.unlock();
}
}
public void beginActionResume(Session session) {
session.actionTimestamp = nextChangeTimestamp();
if (!session.isTransaction) {
session.transactionTimestamp = session.actionTimestamp;
session.isTransaction = true;
transactionCount++;
}
return;
}
void endTransaction(Session session) {
session.isTransaction = false;
transactionCount--;
}
// functional unit - list actions and translate id's
/**
* Return a lookup of all row ids for cached tables in transactions.
*/
public DoubleIntIndex getTransactionIDList() {
DoubleIntIndex lookup = new DoubleIntIndex(10, false);
return lookup;
}
/**
* Convert row ID's for cached table rows in transactions
*/
public void convertTransactionIDs(DoubleIntIndex lookup) {}
}