#include <iostream>

#include "Poco/Task.h"
#include "Poco/TaskManager.h"
#include "Poco/TaskNotification.h"
#include "Poco/Observer.h"

using Poco::Observer;
using namespace std;

class SampleTask: public Poco::Task
{
public:
    SampleTask(const std::string& name): Task(name)
    {

    }

    void runTask()
    {
        for (int i = 0; i < 100; ++i)
        {
            setProgress(float(i)/100); // report progress
            if (sleep(1000))
                break;
        }
    }
};

class ProgressHandler
{
public:
    void onProgress(Poco::TaskProgressNotification* pNf)
    {
        std::cout << pNf->task()->name()
            << " progress: " << pNf->progress() << std::endl;
        pNf->release();
    }

    void onFinished(Poco::TaskFinishedNotification* pNf)
    {
        std::cout << pNf->task()->name() << " finished." << std::endl;
        pNf->release();
    }
};

int main(int argc, char** argv)
{
    Poco::TaskManager tm;
    ProgressHandler pm;
    tm.addObserver(
        Observer<ProgressHandler, Poco::TaskProgressNotification>
        (pm, &ProgressHandler::onProgress)
        );
    tm.addObserver(
        Observer<ProgressHandler, Poco::TaskFinishedNotification>
        (pm, &ProgressHandler::onFinished)
        );
    tm.start(new SampleTask("Task 1")); // tm takes ownership
    tm.start(new SampleTask("Task 2"));
    tm.joinAll();
    return 0;
}   3. Task類圖         最後給出Poco中Task的類圖。

        在類圖中，我們可以看到Task類繼承自RefCountedObject，這主要是為了Task類的管理。TaskManger對Task實現了自動的垃圾收集。