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HSQLDB - Lightweight 100% Java SQL Database Engine
/* Copyright (c) 2001-2019, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.persist.PersistentStore;
/**
* Manages rows involved in transactions
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.5.0
* @since 2.0.0
*/
public class TransactionManager2PL extends TransactionManagerCommon
implements TransactionManager {
public TransactionManager2PL(Database db) {
super(db);
lobSession = database.sessionManager.getSysLobSession();
txModel = LOCKS;
}
public long getGlobalChangeTimestamp() {
return globalChangeTimestamp.get();
}
public void setGlobalChangeTimestamp(long ts) {
globalChangeTimestamp.set(ts);
}
public boolean isMVRows() {
return false;
}
public boolean isMVCC() {
return false;
}
public boolean is2PL() {
return true;
}
public int getTransactionControl() {
return LOCKS;
}
public void setTransactionControl(Session session, int mode) {
super.setTransactionControl(session, mode);
}
public void completeActions(Session session) {
endActionTPL(session);
}
public boolean prepareCommitActions(Session session) {
session.actionTimestamp = getNextGlobalChangeTimestamp();
return true;
}
public boolean commitTransaction(Session session) {
if (session.abortTransaction) {
return false;
}
writeLock.lock();
try {
int limit = session.rowActionList.size();
// new actionTimestamp used for commitTimestamp
session.actionTimestamp = getNextGlobalChangeTimestamp();
session.transactionEndTimestamp = session.actionTimestamp;
endTransaction(session);
for (int i = 0; i < limit; i++) {
RowAction action = (RowAction) session.rowActionList.get(i);
action.commit(session);
}
adjustLobUsage(session);
persistCommit(session);
session.isTransaction = false;
endTransactionTPL(session);
} finally {
writeLock.unlock();
}
session.tempSet.clear();
return true;
}
public void rollback(Session session) {
writeLock.lock();
try {
session.abortTransaction = false;
session.actionTimestamp = getNextGlobalChangeTimestamp();
session.transactionEndTimestamp = session.actionTimestamp;
rollbackPartial(session, 0, session.transactionTimestamp);
endTransaction(session);
session.logSequences();
session.isTransaction = false;
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.actionStartTimestamp);
endActionTPL(session);
}
/**
* rollback the row actions from start index in list and
* the given timestamp
*/
public void rollbackPartial(Session session, int start, long timestamp) {
int limit = session.rowActionList.size();
if (start == limit) {
return;
}
for (int i = limit - 1; i >= start; i--) {
RowAction action = (RowAction) session.rowActionList.get(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,
PersistentStore store, Row row,
int[] colMap) {
RowAction action;
synchronized (row) {
action = RowAction.addDeleteAction(session, table, row, colMap);
}
session.rowActionList.add(action);
store.delete(session, row);
row.rowAction = null;
return action;
}
public void addInsertAction(Session session, Table table,
PersistentStore store, Row row,
int[] changedColumns) {
RowAction action = row.rowAction;
if (action == null) {
/*
System.out.println("null insert action " + session + " "
+ session.actionTimestamp);
*/
throw Error.runtimeError(ErrorCode.GENERAL_ERROR,
"null insert action ");
}
store.indexRow(session, row);
if (table.persistenceScope == Table.SCOPE_ROUTINE) {
row.rowAction = null;
return;
}
session.rowActionList.add(action);
row.rowAction = null;
}
public void addInsertAction(Session session, PersistentStore store,
Row row) {
RowAction action = row.rowAction;
if (action == null) {
throw Error.runtimeError(ErrorCode.GENERAL_ERROR,
"null insert action ");
}
store.indexRow(session, row);
session.rowActionList.add(action);
row.rowAction = null;
}
public void beginTransaction(Session session) {
if (!session.isTransaction) {
beginTransactionCommon(session);
}
}
/**
* add session to the end of queue when a transaction starts
* (depending on isolation mode)
*/
public void beginAction(Session session, Statement cs) {
writeLock.lock();
try {
if (hasExpired) {
session.redoAction = true;
return;
}
cs = updateCurrentStatement(session, cs);
if (cs == null) {
return;
}
boolean canProceed = setWaitedSessionsTPL(session, cs);
if (canProceed) {
session.isPreTransaction = true;
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);
}
} else {
// this is redundant as it has been set when canProceed == false
session.abortTransaction = true;
}
} finally {
writeLock.unlock();
}
}
public void beginActionResume(Session session) {
if (session.isTransaction) {
session.actionTimestamp = getNextGlobalChangeTimestamp();
session.actionStartTimestamp = session.actionTimestamp;
} else {
beginTransactionCommon(session);
}
}
public void removeTransactionInfo(long id) {}
public void resetSession(Session session, Session targetSession,
int mode) {
super.resetSession(session, targetSession, mode);
}
private void endTransaction(Session session) {
if (session.isTransaction) {
transactionCount.decrementAndGet();
}
}
}