/*

 * Copyright (C) 2007, 2008 Apple 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:

 *

 * 1.  Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 * 2.  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.

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE AND ITS 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 APPLE OR ITS 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 "DatabaseTask.h"

#if ENABLE(DATABASE)

#include "Database.h"

#include "Logging.h"

namespace WebCore {

DatabaseTask::DatabaseTask(Database* database)

    : m_database(database)

    , m_complete(false)

{

}

DatabaseTask::~DatabaseTask()

{

}

void DatabaseTask::performTask()

{

    // Database tasks are meant to be used only once, so make sure this one hasn't been performed before.

    ASSERT(!m_complete);

    LOG(StorageAPI, "Performing %s %p\n", debugTaskName(), this);

    m_database->resetAuthorizer();

    doPerformTask();

    m_database->performPolicyChecks();

    if (m_synchronousMutex)

        m_synchronousMutex->lock();

    m_complete = true;

    if (m_synchronousMutex) {

        m_synchronousCondition->signal();

        m_synchronousMutex->unlock();

    }

}

void DatabaseTask::lockForSynchronousScheduling()

{

    // Called from main thread.

    ASSERT(!m_synchronousMutex);

    ASSERT(!m_synchronousCondition);

    m_synchronousMutex.set(new Mutex);

    m_synchronousCondition.set(new ThreadCondition);

}

void DatabaseTask::waitForSynchronousCompletion()

{

    // Called from main thread.

    m_synchronousMutex->lock();

    if (!m_complete)

        m_synchronousCondition->wait(*m_synchronousMutex);

    m_synchronousMutex->unlock();

}

// *** DatabaseOpenTask ***

// Opens the database file and verifies the version matches the expected version.

DatabaseOpenTask::DatabaseOpenTask(Database* database)

    : DatabaseTask(database)

    , m_code(0)

    , m_success(false)

{

}

void DatabaseOpenTask::doPerformTask()

{

    m_success = database()->performOpenAndVerify(m_code);

}

#ifndef NDEBUG

const char* DatabaseOpenTask::debugTaskName() const

{

    return "DatabaseOpenTask";

}

#endif

// *** DatabaseCloseTask ***

// Closes the database.

DatabaseCloseTask::DatabaseCloseTask(Database* database)

    : DatabaseTask(database)

{

}

void DatabaseCloseTask::doPerformTask()

{

    database()->close();

}

#ifndef NDEBUG

const char* DatabaseCloseTask::debugTaskName() const

{

    return "DatabaseCloseTask";

}

#endif

// *** DatabaseTransactionTask ***

// Starts a transaction that will report its results via a callback.

DatabaseTransactionTask::DatabaseTransactionTask(PassRefPtr<SQLTransaction> transaction)

    : DatabaseTask(transaction->database())

    , m_transaction(transaction)

{

}

DatabaseTransactionTask::~DatabaseTransactionTask()

{

}

void DatabaseTransactionTask::doPerformTask()

{

    if (m_transaction->performNextStep()) {

        // The transaction is complete, we can move on to the next one.

        MutexLocker locker(m_transaction->database()->m_transactionInProgressMutex);

        m_transaction->database()->scheduleTransaction();

    }

}

#ifndef NDEBUG

const char* DatabaseTransactionTask::debugTaskName() const

{

    return "DatabaseTransactionTask";

}

#endif

// *** DatabaseTableNamesTask ***

// Retrieves a list of all tables in the database - for WebInspector support.

DatabaseTableNamesTask::DatabaseTableNamesTask(Database* database)

    : DatabaseTask(database)

{

}

void DatabaseTableNamesTask::doPerformTask()

{

    m_tableNames = database()->performGetTableNames();

}

#ifndef NDEBUG

const char* DatabaseTableNamesTask::debugTaskName() const

{

    return "DatabaseTableNamesTask";

}

#endif

} // namespace WebCore

#endif