/*
 * Copyright (C) 2009 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,
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 */

#ifndef SQLTransactionCoordinator_h
#define SQLTransactionCoordinator_h

#if ENABLE(SQL_DATABASE)

#include <wtf/Deque.h>
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/RefPtr.h>
#include <wtf/text/StringHash.h>

namespace WebCore {

    class SQLTransaction;

    class SQLTransactionCoordinator {
        WTF_MAKE_NONCOPYABLE(SQLTransactionCoordinator); WTF_MAKE_FAST_ALLOCATED;
    public:
        SQLTransactionCoordinator() { }
        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 // ENABLE(SQL_DATABASE)

#endif // SQLTransactionCoordinator_h