/*

 * Copyright (C) 2009 Google Inc. All rights reserved.

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 * modification, are permitted provided that the following conditions are

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 *

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 * 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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#ifndef SQLTransactionCoordinator_h

#define SQLTransactionCoordinator_h

#include "CString.h"

#include "StringHash.h"

#include <wtf/Deque.h>

#include <wtf/HashMap.h>

#include <wtf/HashSet.h>

#include <wtf/RefPtr.h>

namespace WebCore {

    class SQLTransaction;

    class SQLTransactionCoordinator {

    public:

        void acquireLock(SQLTransaction*);

        void releaseLock(SQLTransaction*);

        void shutdown();

    private:

        typedef Deque<RefPtr<SQLTransaction> > TransactionsQueue;

        struct CoordinationInfo {

            TransactionsQueue pendingTransactions;

            HashSet<RefPtr<SQLTransaction> > activeReadTransactions;

            RefPtr<SQLTransaction> activeWriteTransaction;

        };

        // Maps database names to information about pending transactions

        typedef HashMap<String, CoordinationInfo> CoordinationInfoMap;

        CoordinationInfoMap m_coordinationInfoMap;

        void processPendingTransactions(CoordinationInfo& info);

    };

}

#endif // SQLTransactionCoordinator_h