Trying to understand some code parts

[zandhaai]

Thank you for this project!

I am stripping some code because I only need some parts, but now I do not understand some things. Given the following part:

Interlocked.Increment(ref Cache.counter);
SimpleObject simpleObject = new SimpleObject {Key = key, Value = value, FileLocation = filelocation};

sendQueue.Add(simpleObject);
var data = sendQueue.Take(); //this blocks if there are no items in the queue.

//Add to cache
Cache.CacheDictionary[filelocation + key] = simpleObject;
ThreadPool.QueueUserWorkItem(state =>
{
Storage.WriteToStorage(data.Key, Compress.CompressGZip(ConvertHelper.ObjectToByteArray(value)), data.FileLocation);
});

My questions:

1. Why did you implement a sendQueue? The key after a Take() is used in the WriteToStorage. Why can't the key not be used directly?
2. The above method adds the object to the cache but it is later deleted inside WriteToStorage. Is this wrong or did I miss an important part of code?
3. Should the statement 'Interlocked.Decrement(ref Cache.counter);' not be after the thread.sleep inside WriteToStorage?

Best regards,

Evert