Observer.h

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/*
 * Copyright (c) 2005 Palmsource, Inc.
 * 
 * This software is licensed as described in the file LICENSE, which
 * you should have received as part of this distribution. The terms
 * are also available at http://www.openbinder.org/license.html.
 * 
 * This software consists of voluntary contributions made by many
 * individuals. For the exact contribution history, see the revision
 * history and logs, available at http://www.openbinder.org
 */

#ifndef _SUPPORT__OBSERVER_H
#define _SUPPORT__OBSERVER_H

#include <support/Binder.h>
#include <support/Handler.h>
#include <support/Locker.h>

#if _SUPPORTS_NAMESPACE
namespace palmos {
namespace support {
#endif


class BObserver : public BBinder
{
public:
                        BObserver(const SContext& context);

protected:
    virtual             ~BObserver();

    virtual void        Observed(const SValue& key, const SValue& value) = 0;

    virtual status_t    HandleEffect(   const SValue &in,
                                        const SValue &inBindings,
                                        const SValue &outBindings,
                                        SValue *out);
    virtual status_t    DispatchEffect(const SValue& told);
};

enum {
    B_SERIAL_OBSERVER_MSG = 'sero'
};

class BSerialObserver : public BObserver, public SHandler
{
public:
                        BSerialObserver(const SContext& context);

    virtual status_t    HandleMessage(const SMessage &msg);


            void        SetPriority(int32_t priority);
            int32_t     Priority() const;

protected:
    virtual             ~BSerialObserver();
    virtual void        InitAtom();

    virtual status_t    DispatchEffect(const SValue& told);


    SLocker&            SerialLock() const  { return m_lock; }

private:
    mutable SLocker     m_lock;
            int32_t     m_priority;
};

#if _SUPPORTS_NAMESPACE
} } // palmos::support
#endif

#endif // _SUPPORT__OBSERVER_H

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PalmSource, Inc. © 2005