completion_notify.h

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class completion_notify : public service_base {
public:
    virtual void on_completion(unsigned p_code) = 0;

    void on_completion_async(unsigned p_code);

    static void g_signal_completion_async(service_ptr_t<completion_notify> p_notify,unsigned p_code);

    FB2K_MAKE_SERVICE_INTERFACE(completion_notify,service_base);
};

class completion_notify_dummy : public completion_notify {
public:
    void on_completion(unsigned p_code) {}
};

class completion_notify_orphanable : public completion_notify {
public:
    virtual void orphan() = 0;
};

template<typename t_receiver>
class completion_notify_impl : public completion_notify_orphanable {
public:
    void on_completion(unsigned p_code) {
        if (m_receiver != NULL) {
            m_receiver->on_task_completion(m_taskid,p_code);
        }
    }
    void setup(t_receiver * p_receiver, unsigned p_task_id) {m_receiver = p_receiver; m_taskid = p_task_id;}
    void orphan() {m_receiver = NULL; m_taskid = 0;}
private:
    t_receiver * m_receiver;
    unsigned m_taskid;
};

template<typename t_receiver>
service_nnptr_t<completion_notify_orphanable> completion_notify_create(t_receiver * p_receiver,unsigned p_taskid) {
    service_nnptr_t<completion_notify_impl<t_receiver> > instance = new service_impl_t<completion_notify_impl<t_receiver> >();
    instance->setup(p_receiver,p_taskid);
    return instance;
}

typedef service_ptr_t<completion_notify> completion_notify_ptr;
typedef service_ptr_t<completion_notify_orphanable> completion_notify_orphanable_ptr;
typedef service_nnptr_t<completion_notify> completion_notify_nnptr;
typedef service_nnptr_t<completion_notify_orphanable> completion_notify_orphanable_nnptr;

class completion_notify_receiver {
public:
    completion_notify::ptr create_or_get_task(unsigned p_id) {
        completion_notify_orphanable_ptr ptr;
        if (!m_tasks.query(p_id,ptr)) {
            ptr = completion_notify_create(this,p_id);
            m_tasks.set(p_id,ptr);
        }
        return ptr;
    }
    completion_notify_ptr create_task(unsigned p_id) {
        completion_notify_orphanable_ptr ptr;
        if (m_tasks.query(p_id,ptr)) ptr->orphan();
        ptr = completion_notify_create(this,p_id);
        m_tasks.set(p_id,ptr);
        return ptr;
    }
    bool have_task(unsigned p_id) const {
        return m_tasks.have_item(p_id);
    }
    void orphan_task(unsigned p_id) {
        completion_notify_orphanable_ptr ptr;
        if (m_tasks.query(p_id,ptr)) {
            ptr->orphan();
            m_tasks.remove(p_id);
        }
    }
    ~completion_notify_receiver() {
        orphan_all_tasks();
    }
    void orphan_all_tasks() {
        m_tasks.enumerate(orphanfunc);
        m_tasks.remove_all();
    }

    virtual void on_task_completion(unsigned p_id,unsigned p_status) {}
private:
    static void orphanfunc(unsigned,completion_notify_orphanable_nnptr p_item) {p_item->orphan();}
    pfc::map_t<unsigned,completion_notify_orphanable_nnptr> m_tasks;
};