.NET implementation of an active object template

Question

I am looking for implementations of an active object template, but not so many so far. Here is what I came up with:

• http://geekswithblogs.net/dbose/archive/2009/10/17/c-activeobject-runnable.aspx

You need something a little more active. Preferred for .NET Version <= 3.5.

Answer 1

See System.Threading.Tasks.Task.

Answer 2

Simple implementation using System.Threading.Tasks.Task

class ActiveObject : IDisposable
{
    private Task _lastTask = Task.Factory.StartNew(() => { });

    public void Dispose()
    {
        if (_lastTask == null)
            return;

        _lastTask.Wait();
        _lastTask = null;
    }

    public void InvokeAsync(Action action)
    {
        if (_lastTask == null)
            throw new ObjectDisposedException(GetType().FullName);

        _lastTask = _lastTask.ContinueWith(t => action());
    }
}

InvokeAsyncnot thread safe, use lock (_lastTask) lastTask = ...;if you need it.

Answer 3

, .

http://www.codeproject.com/KB/architecture/LongRunningActiveObject.aspx

Answer 4

Adding the Quiet Answer to Anton, there is a version of System.Threading.Tasks.Task for .NET 3.5, available as part of Reactive Extensions . Please note that this version does not have official Microsoft support.