--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/storage/SQLTransactionSync.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,206 @@
+/*
+ * Copyright (C) 2010 Google Inc. 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 Google Inc. 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 THE COPYRIGHT
+ * OWNER 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.
+ */
+
+#include "config.h"
+#include "SQLTransactionSync.h"
+
+#if ENABLE(DATABASE)
+
+#include "DatabaseSync.h"
+#include "PlatformString.h"
+#include "SQLException.h"
+#include "SQLResultSet.h"
+#include "SQLStatementSync.h"
+#include "SQLTransactionClient.h"
+#include "SQLTransactionSyncCallback.h"
+#include "SQLValue.h"
+#include "SQLiteTransaction.h"
+#include "ScriptExecutionContext.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+PassRefPtr<SQLTransactionSync> SQLTransactionSync::create(DatabaseSync* db, PassRefPtr<SQLTransactionSyncCallback> callback, bool readOnly)
+{
+    return adoptRef(new SQLTransactionSync(db, callback, readOnly));
+}
+
+SQLTransactionSync::SQLTransactionSync(DatabaseSync* db, PassRefPtr<SQLTransactionSyncCallback> callback, bool readOnly)
+    : m_database(db)
+    , m_callback(callback)
+    , m_readOnly(readOnly)
+    , m_modifiedDatabase(false)
+    , m_transactionClient(new SQLTransactionClient())
+{
+    ASSERT(m_database->scriptExecutionContext()->isContextThread());
+}
+
+SQLTransactionSync::~SQLTransactionSync()
+{
+    ASSERT(m_database->scriptExecutionContext()->isContextThread());
+    if (m_sqliteTransaction && m_sqliteTransaction->inProgress())
+        rollback();
+}
+
+PassRefPtr<SQLResultSet> SQLTransactionSync::executeSQL(const String& sqlStatement, const Vector<SQLValue>& arguments, ExceptionCode& ec)
+{
+    ASSERT(m_database->scriptExecutionContext()->isContextThread());
+    if (!m_database->opened()) {
+        ec = SQLException::UNKNOWN_ERR;
+        return 0;
+    }
+
+    if (!m_database->versionMatchesExpected()) {
+        ec = SQLException::VERSION_ERR;
+        return 0;
+    }
+
+    if (sqlStatement.isEmpty())
+        return 0;
+
+    bool readOnlyMode = m_readOnly || m_database->scriptExecutionContext()->isDatabaseReadOnly();
+    SQLStatementSync statement(sqlStatement, arguments, readOnlyMode);
+
+    m_database->resetAuthorizer();
+    bool retryStatement = true;
+    RefPtr<SQLResultSet> resultSet;
+    while (retryStatement) {
+        retryStatement = false;
+        resultSet = statement.execute(m_database.get(), ec);
+        if (!resultSet) {
+            if (m_sqliteTransaction->wasRolledBackBySqlite())
+                return 0;
+
+            if (ec == SQLException::QUOTA_ERR) {
+                if (m_transactionClient->didExceedQuota(database())) {
+                    ec = 0;
+                    retryStatement = true;
+                } else
+                    return 0;
+            }
+        }
+    }
+
+    if (m_database->lastActionChangedDatabase()) {
+        m_modifiedDatabase = true;
+        m_transactionClient->didExecuteStatement(database());
+    }
+
+    return resultSet.release();
+}
+
+ExceptionCode SQLTransactionSync::begin()
+{
+    ASSERT(m_database->scriptExecutionContext()->isContextThread());
+    if (!m_database->opened())
+        return SQLException::UNKNOWN_ERR;
+
+    ASSERT(!m_database->sqliteDatabase().transactionInProgress());
+
+    // Set the maximum usage for this transaction if this transactions is not read-only.
+    if (!m_readOnly)
+        m_database->sqliteDatabase().setMaximumSize(m_database->maximumSize());
+
+    ASSERT(!m_sqliteTransaction);
+    m_sqliteTransaction.set(new SQLiteTransaction(m_database->sqliteDatabase(), m_readOnly));
+
+    m_database->resetDeletes();
+    m_database->disableAuthorizer();
+    m_sqliteTransaction->begin();
+    m_database->enableAuthorizer();
+
+    // Check if begin() succeeded.
+    if (!m_sqliteTransaction->inProgress()) {
+        ASSERT(!m_database->sqliteDatabase().transactionInProgress());
+        m_sqliteTransaction.clear();
+        return SQLException::DATABASE_ERR;
+    }
+
+    return 0;
+}
+
+ExceptionCode SQLTransactionSync::execute()
+{
+    ASSERT(m_database->scriptExecutionContext()->isContextThread());
+    if (!m_database->opened() || !m_callback || !m_callback->handleEvent(m_database->scriptExecutionContext(), this)) {
+        m_callback = 0;
+        return SQLException::UNKNOWN_ERR;
+    }
+
+    m_callback = 0;
+    return 0;
+}
+
+ExceptionCode SQLTransactionSync::commit()
+{
+    ASSERT(m_database->scriptExecutionContext()->isContextThread());
+    if (!m_database->opened())
+        return SQLException::UNKNOWN_ERR;
+
+    ASSERT(m_sqliteTransaction);
+
+    m_database->disableAuthorizer();
+    m_sqliteTransaction->commit();
+    m_database->enableAuthorizer();
+
+    // If the commit failed, the transaction will still be marked as "in progress"
+    if (m_sqliteTransaction->inProgress())
+        return SQLException::DATABASE_ERR;
+
+    m_sqliteTransaction.clear();
+
+    // Vacuum the database if anything was deleted.
+    if (m_database->hadDeletes())
+        m_database->incrementalVacuumIfNeeded();
+
+    // The commit was successful. If the transaction modified this database, notify the delegates.
+    if (m_modifiedDatabase)
+        m_transactionClient->didCommitWriteTransaction(database());
+
+    return 0;
+}
+
+void SQLTransactionSync::rollback()
+{
+    ASSERT(m_database->scriptExecutionContext()->isContextThread());
+    m_database->disableAuthorizer();
+    if (m_sqliteTransaction) {
+        m_sqliteTransaction->rollback();
+        m_sqliteTransaction.clear();
+    }
+    m_database->enableAuthorizer();
+
+    ASSERT(!m_database->sqliteDatabase().transactionInProgress());
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(DATABASE)