IDBTransactionBackendImpl.h   [plain text]


/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * 1.  Redistributions of source code must retain the above copyright
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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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#ifndef IDBTransactionBackendImpl_h
#define IDBTransactionBackendImpl_h

#if ENABLE(INDEXED_DATABASE)

#include "DOMStringList.h"
#include "IDBBackingStore.h"
#include "IDBTransactionBackendInterface.h"
#include "IDBTransactionCallbacks.h"
#include "Timer.h"
#include <wtf/Deque.h>
#include <wtf/HashSet.h>
#include <wtf/RefPtr.h>

namespace WebCore {

class IDBDatabaseBackendImpl;

class IDBTransactionBackendImpl : public IDBTransactionBackendInterface {
public:
    static PassRefPtr<IDBTransactionBackendImpl> create(DOMStringList* objectStores, unsigned short mode, IDBDatabaseBackendImpl*);
    virtual ~IDBTransactionBackendImpl();

    virtual PassRefPtr<IDBObjectStoreBackendInterface> objectStore(const String& name, ExceptionCode&);
    virtual unsigned short mode() const { return m_mode; }
    virtual bool scheduleTask(PassOwnPtr<ScriptExecutionContext::Task> task, PassOwnPtr<ScriptExecutionContext::Task> abortTask);
    virtual void didCompleteTaskEvents();
    virtual void abort();
    virtual void setCallbacks(IDBTransactionCallbacks* callbacks) { m_callbacks = callbacks; }
    virtual void registerOpenCursor(IDBCursorBackendImpl*);
    virtual void unregisterOpenCursor(IDBCursorBackendImpl*);

    void run();

private:
    IDBTransactionBackendImpl(DOMStringList* objectStores, unsigned short mode, IDBDatabaseBackendImpl*);

    enum State {
        Unused, // Created, but no tasks yet.
        StartPending, // Enqueued tasks, but SQLite transaction not yet started.
        Running, // SQLite transaction started but not yet finished.
        Finished, // Either aborted or committed.
    };

    void start();
    void commit();

    void taskTimerFired(Timer<IDBTransactionBackendImpl>*);
    void taskEventTimerFired(Timer<IDBTransactionBackendImpl>*);
    void closeOpenCursors();

    RefPtr<DOMStringList> m_objectStoreNames;
    unsigned short m_mode;

    State m_state;
    RefPtr<IDBTransactionCallbacks> m_callbacks;
    RefPtr<IDBDatabaseBackendImpl> m_database;

    typedef Deque<OwnPtr<ScriptExecutionContext::Task> > TaskQueue;
    TaskQueue m_taskQueue;
    TaskQueue m_abortTaskQueue;

    RefPtr<IDBBackingStore::Transaction> m_transaction;

    // FIXME: delete the timer once we have threads instead.
    Timer<IDBTransactionBackendImpl> m_taskTimer;
    Timer<IDBTransactionBackendImpl> m_taskEventTimer;
    int m_pendingEvents;

    HashSet<IDBCursorBackendImpl*> m_openCursors;
};

} // namespace WebCore

#endif // ENABLE(INDEXED_DATABASE)

#endif // IDBTransactionBackendImpl_h