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Dealing with Progressive Operations

, 10 May 2010 CPOL
Through a clean OOP solution to deal with progressive operations, I will implicitly show you how OOP principles can work together to make a full, clean solution.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using Erik.Utilities.Bases;
using Erik.Utilities.Interfaces;

namespace Erik.Utilities.Bases
    // This class is just to show a tiny implementation
    // using the Framework's ThreadPool. However, it
    // will not perform very well
    public class BackgroundCompositePO_ThreadPool : 
        Mutex _curStepMutex;
        protected List<IProgressiveOperation> _operations;

        protected BackgroundCompositePO_ThreadPool()
            _curStepMutex = new Mutex(false);

        public BackgroundCompositePO_ThreadPool(
            List<IProgressiveOperation> operations) : this()
            _operations = operations;
            _totalSteps = _operations.Sum<IProgressiveOperation>(po => po.TotalSteps);

        public override void Start()
            if (!Monitor.TryEnter(this))
                throw new InvalidOperationException(
                    "Operation is already running");

            _currentStep = 0;

            foreach (IProgressiveOperation po in _operations)
                po.OperationProgress +=
                    (sender, e) =>

                ThreadPool.QueueUserWorkItem(new WaitCallback(InitOperation), po);

        void InitOperation(object operation)

        protected void IncreaseCurrentStep()

            if (_currentStep == _totalSteps)


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