ClickHouse/base/poco/Foundation/include/Poco/TaskNotification.h

//
// TaskNotification.h
//
// Library: Foundation
// Package: Tasks
// Module:  Tasks
//
// Definition of the TaskNotification class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_TaskNotification_INCLUDED
#define Foundation_TaskNotification_INCLUDED


#include "Poco/Foundation.h"
#include "Poco/Notification.h"
#include "Poco/Task.h"


namespace Poco
{


class Foundation_API TaskNotification : public Notification
/// Base class for TaskManager notifications.
{
public:
    TaskNotification(Task * pTask);
    /// Creates the TaskNotification.

    Task * task() const;
    /// Returns the subject of the notification.

protected:
    virtual ~TaskNotification();
    /// Destroys the TaskNotification.

private:
    Task * _pTask;
};


class Foundation_API TaskStartedNotification : public TaskNotification
/// This notification is posted by the TaskManager for
/// every task that has been started.
{
public:
    TaskStartedNotification(Task * pTask);

protected:
    ~TaskStartedNotification();
};


class Foundation_API TaskCancelledNotification : public TaskNotification
/// This notification is posted by the TaskManager for
/// every task that has been cancelled.
{
public:
    TaskCancelledNotification(Task * pTask);

protected:
    ~TaskCancelledNotification();
};


class Foundation_API TaskFinishedNotification : public TaskNotification
/// This notification is posted by the TaskManager for
/// every task that has finished.
{
public:
    TaskFinishedNotification(Task * pTask);

protected:
    ~TaskFinishedNotification();
};


class Foundation_API TaskFailedNotification : public TaskNotification
/// This notification is posted by the TaskManager for
/// every task that has failed with an exception.
{
public:
    TaskFailedNotification(Task * pTask, const Exception & exc);

    const Exception & reason() const;

protected:
    ~TaskFailedNotification();

private:
    Exception * _pException;
};


class Foundation_API TaskProgressNotification : public TaskNotification
/// This notification is posted by the TaskManager for
/// a task when its progress changes.
{
public:
    TaskProgressNotification(Task * pTask, float progress);

    float progress() const;

protected:
    ~TaskProgressNotification();

private:
    float _progress;
};


template <class C>
class TaskCustomNotification : public TaskNotification
/// This is a template for "custom" notification.
/// Unlike other notifications, this notification
/// is instantiated and posted by the task itself.
/// The purpose is to provide generic notification
/// mechanism between the task and its observer(s).
{
public:
    TaskCustomNotification(Task * pTask, const C & custom) : TaskNotification(pTask), _custom(custom) { }

    const C & custom() const { return _custom; }

protected:
    ~TaskCustomNotification(){};

private:
    C _custom;
};


//
// inlines
//
inline Task * TaskNotification::task() const
{
    return _pTask;
}


inline const Exception & TaskFailedNotification::reason() const
{
    return *_pException;
}


inline float TaskProgressNotification::progress() const
{
    return _progress;
}


} // namespace Poco


#endif // Foundation_TaskNotification_INCLUDED