third_party/WebKit/Source/modules/webdatabase/DatabaseTask.h

/*
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 *
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 *     notice, this list of conditions and the following disclaimer.
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 *     notice, this list of conditions and the following disclaimer in the
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 *     its contributors may be used to endorse or promote products derived
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#ifndef DatabaseTask_h
#define DatabaseTask_h

#include "modules/webdatabase/Database.h"
#include "modules/webdatabase/DatabaseBasicTypes.h"
#include "modules/webdatabase/DatabaseError.h"
#include "modules/webdatabase/SQLTransactionBackend.h"
#include "platform/WaitableEvent.h"
#include "platform/heap/Handle.h"
#include "wtf/PtrUtil.h"
#include "wtf/Threading.h"
#include "wtf/Vector.h"
#include "wtf/text/WTFString.h"
#include <memory>

namespace blink {

class DatabaseTask {
    WTF_MAKE_NONCOPYABLE(DatabaseTask); USING_FAST_MALLOC(DatabaseTask);
public:
    virtual ~DatabaseTask();

    void run();

    Database* database() const { return m_database.get(); }

protected:
    DatabaseTask(Database*, WaitableEvent* completeEvent);

private:
    virtual void doPerformTask() = 0;
    virtual void taskCancelled() { }

    CrossThreadPersistent<Database> m_database;
    WaitableEvent* m_completeEvent;

#if DCHECK_IS_ON()
    virtual const char* debugTaskName() const = 0;
    bool m_complete;
#endif
};

class Database::DatabaseOpenTask final : public DatabaseTask {
public:
    static std::unique_ptr<DatabaseOpenTask> create(Database* db, bool setVersionInNewDatabase, WaitableEvent* completeEvent, DatabaseError& error, String& errorMessage, bool& success)
    {
        return wrapUnique(new DatabaseOpenTask(db, setVersionInNewDatabase, completeEvent, error, errorMessage, success));
    }

private:
    DatabaseOpenTask(Database*, bool setVersionInNewDatabase, WaitableEvent*, DatabaseError&, String& errorMessage, bool& success);

    void doPerformTask() override;
#if DCHECK_IS_ON()
    const char* debugTaskName() const override;
#endif

    bool m_setVersionInNewDatabase;
    DatabaseError& m_error;
    String& m_errorMessage;
    bool& m_success;
};

class Database::DatabaseCloseTask final : public DatabaseTask {
public:
    static std::unique_ptr<DatabaseCloseTask> create(Database* db, WaitableEvent* synchronizer)
    {
        return wrapUnique(new DatabaseCloseTask(db, synchronizer));
    }

private:
    DatabaseCloseTask(Database*, WaitableEvent*);

    void doPerformTask() override;
#if DCHECK_IS_ON()
    const char* debugTaskName() const override;
#endif
};

class Database::DatabaseTransactionTask final : public DatabaseTask {
public:
    ~DatabaseTransactionTask() override;

    // Transaction task is never synchronous, so no 'synchronizer' parameter.
    static std::unique_ptr<DatabaseTransactionTask> create(SQLTransactionBackend* transaction)
    {
        return wrapUnique(new DatabaseTransactionTask(transaction));
    }

    SQLTransactionBackend* transaction() const { return m_transaction.get(); }

private:
    explicit DatabaseTransactionTask(SQLTransactionBackend*);

    void doPerformTask() override;
    void taskCancelled() override;
#if DCHECK_IS_ON()
    const char* debugTaskName() const override;
#endif

    CrossThreadPersistent<SQLTransactionBackend> m_transaction;
};

class Database::DatabaseTableNamesTask final : public DatabaseTask {
public:
    static std::unique_ptr<DatabaseTableNamesTask> create(Database* db, WaitableEvent* synchronizer, Vector<String>& names)
    {
        return wrapUnique(new DatabaseTableNamesTask(db, synchronizer, names));
    }

private:
    DatabaseTableNamesTask(Database*, WaitableEvent*, Vector<String>& names);

    void doPerformTask() override;
#if DCHECK_IS_ON()
    const char* debugTaskName() const override;
#endif

    Vector<String>& m_tableNames;
};

} // namespace blink

#endif // DatabaseTask_h