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Viewing changes to Source/WebCore/Modules/webdatabase/SQLTransactionCoordinator.cpp

  • Committer: Package Import Robot
  • Author(s): Jonathan Riddell
  • Date: 2013-02-18 14:24:18 UTC
  • Revision ID: package-import@ubuntu.com-20130218142418-eon0jmjg3nj438uy
Tags: upstream-2.3
Import upstream version 2.3

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Source/WebCore/Modules/webdatabase/SQLTransactionCoordinator.cpp
 
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/*
 
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 * Copyright (C) 2009 Google Inc. All rights reserved.
 
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 *
 
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 * Redistribution and use in source and binary forms, with or without
 
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 * modification, are permitted provided that the following conditions are
 
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 * met:
 
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 *
 
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 *     * Redistributions of source code must retain the above copyright
 
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 * notice, this list of conditions and the following disclaimer.
 
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 *     * Redistributions in binary form must reproduce the above
 
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 * copyright notice, this list of conditions and the following disclaimer
 
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 * in the documentation and/or other materials provided with the
 
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 * distribution.
 
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 *     * Neither the name of Google Inc. nor the names of its
 
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 * contributors may be used to endorse or promote products derived from
 
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 * this software without specific prior written permission.
 
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 *
 
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 
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 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 
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 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
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 */
 
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#include "config.h"
 
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#include "SQLTransactionCoordinator.h"
 
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#if ENABLE(SQL_DATABASE)
 
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#include "Database.h"
 
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#include "SQLTransaction.h"
 
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#include <wtf/Deque.h>
 
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#include <wtf/HashMap.h>
 
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#include <wtf/HashSet.h>
 
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#include <wtf/RefPtr.h>
 
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namespace WebCore {
 
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static String getDatabaseIdentifier(SQLTransaction* transaction)
 
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{
 
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    Database* database = transaction->database();
 
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    ASSERT(database);
 
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    return database->stringIdentifier();
 
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}
 
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void SQLTransactionCoordinator::processPendingTransactions(CoordinationInfo& info)
 
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{
 
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    if (info.activeWriteTransaction || info.pendingTransactions.isEmpty())
 
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        return;
 
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    RefPtr<SQLTransaction> firstPendingTransaction = info.pendingTransactions.first();
 
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    if (firstPendingTransaction->isReadOnly()) {
 
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        do {
 
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            firstPendingTransaction = info.pendingTransactions.takeFirst();
 
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            info.activeReadTransactions.add(firstPendingTransaction);
 
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            firstPendingTransaction->lockAcquired();
 
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        } while (!info.pendingTransactions.isEmpty() && info.pendingTransactions.first()->isReadOnly());
 
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    } else if (info.activeReadTransactions.isEmpty()) {
 
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        info.pendingTransactions.removeFirst();
 
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        info.activeWriteTransaction = firstPendingTransaction;
 
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        firstPendingTransaction->lockAcquired();
 
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    }
 
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}
 
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void SQLTransactionCoordinator::acquireLock(SQLTransaction* transaction)
 
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{
 
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    String dbIdentifier = getDatabaseIdentifier(transaction);
 
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    CoordinationInfoMap::iterator coordinationInfoIterator = m_coordinationInfoMap.find(dbIdentifier);
 
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    if (coordinationInfoIterator == m_coordinationInfoMap.end()) {
 
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        // No pending transactions for this DB
 
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        coordinationInfoIterator = m_coordinationInfoMap.add(dbIdentifier, CoordinationInfo()).iterator;
 
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    }
 
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    CoordinationInfo& info = coordinationInfoIterator->value;
 
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    info.pendingTransactions.append(transaction);
 
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    processPendingTransactions(info);
 
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}
 
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void SQLTransactionCoordinator::releaseLock(SQLTransaction* transaction)
 
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{
 
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    if (m_coordinationInfoMap.isEmpty())
 
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        return;
 
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    String dbIdentifier = getDatabaseIdentifier(transaction);
 
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    CoordinationInfoMap::iterator coordinationInfoIterator = m_coordinationInfoMap.find(dbIdentifier);
 
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    ASSERT(coordinationInfoIterator != m_coordinationInfoMap.end());
 
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    CoordinationInfo& info = coordinationInfoIterator->value;
 
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    if (transaction->isReadOnly()) {
 
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        ASSERT(info.activeReadTransactions.contains(transaction));
 
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        info.activeReadTransactions.remove(transaction);
 
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    } else {
 
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        ASSERT(info.activeWriteTransaction == transaction);
 
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        info.activeWriteTransaction = 0;
 
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    }
 
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    processPendingTransactions(info);
 
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}
 
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void SQLTransactionCoordinator::shutdown()
 
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{
 
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    // Notify all transactions in progress that the database thread is shutting down
 
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    for (CoordinationInfoMap::iterator coordinationInfoIterator = m_coordinationInfoMap.begin();
 
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         coordinationInfoIterator != m_coordinationInfoMap.end(); ++coordinationInfoIterator) {
 
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        CoordinationInfo& info = coordinationInfoIterator->value;
 
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        if (info.activeWriteTransaction)
 
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            info.activeWriteTransaction->notifyDatabaseThreadIsShuttingDown();
 
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        for (HashSet<RefPtr<SQLTransaction> >::iterator activeReadTransactionsIterator =
 
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                     info.activeReadTransactions.begin();
 
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             activeReadTransactionsIterator != info.activeReadTransactions.end();
 
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             ++activeReadTransactionsIterator) {
 
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            (*activeReadTransactionsIterator)->notifyDatabaseThreadIsShuttingDown();
 
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        }
 
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    }
 
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    // Clean up all pending transactions for all databases
 
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    m_coordinationInfoMap.clear();
 
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}
 
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} // namespace WebCore
 
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#endif // ENABLE(SQL_DATABASE)