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Instanciating Objects on the fly

Posted on 2006-06-12
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Last Modified: 2010-04-16
I have created a method :

public void newQueue()
{
   Queue myQueue = new Queue();
}

This basically creates a new queue. What I want to be able to do is create as many queues as I need by simply calling newQueue();

Most likely I would need to pass in a String and an Id Number so I can Name and Number the queues. Any ideas on how to do this? Basically I dont want to be restricted to reusing the same queue over and over, as I would potntially like 6 - 12 queues running at the same time. So overlapping them wouldnt be good.

Cheers

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Question by:directxBOB
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Expert Comment

by:Jase-Coder
ID: 16891874
you could pass a number to the function and return an array of new queues like:
0
 

Author Comment

by:directxBOB
ID: 16891891
So basically I would be creating a list? and each element in the list would be a Queue which I pull back out using an Element number....
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Author Comment

by:directxBOB
ID: 16891907
eg:

Queue myQueue = new Queue();
ArrayList myList = new ArrayList();
myList.Add(myQueue);

but how do I add the id, and more importantly how do I make it more dynamic, I was thinking doing a Factory style system but it would need to be far more lightweight.

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LVL 85

Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 16891965
You could do something like...

    public partial class frmMain : Form
    {

        Hashtable queues = new Hashtable();

        public Queue myQueues(string ID)
        {
            Queue retQueue;
            if (!queues.ContainsKey(ID))
            {
                retQueue = new Queue();
                queues.Add(ID, retQueue);
            }
            else
            {
                retQueue = (Queue)queues[ID];
            }
            return retQueue;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            myQueues("Q1").Enqueue("Hello...");
            myQueues("Q1").Enqueue("Experts");

            myQueues("Q2").Enqueue("...Goodbye");
            myQueues("Q2").Enqueue("Exchange");

            Debug.WriteLine(myQueues("Q1").Dequeue().ToString());
            Debug.WriteLine(myQueues("Q2").Dequeue().ToString());

            Debug.WriteLine(myQueues("Q1").Dequeue().ToString() + myQueues("Q2").Dequeue().ToString());
        }

    }
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Author Comment

by:directxBOB
ID: 16892110
and to remove a Queue from the Hashtable:

queues.remove(ID);

is this correct?
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LVL 11

Expert Comment

by:Jase-Coder
ID: 16892448
yes that is correct
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LVL 85

Assisted Solution

by:Mike Tomlinson
Mike Tomlinson earned 500 total points
ID: 16893548
Right...

        public void myQueuesRemove(string ID)
        {
            if (queues.ContainsKey(ID))
            {
                queues.Remove(ID);
            }
        }

...then:

    myQueuesRemove("Q1");

You also need to either check the Queues Count before Dequeuing or enclose the calls in a Try...Catch block to keep your app from crashing if you Dequeue and empty Queue.
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Author Comment

by:directxBOB
ID: 16898573
If I call this:

Queue myQueue = new Queue();

10 times am I creating 10 new Queues or am I re-instanciating the same queue 10 times over?
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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 16898640
You are creating ten new queues.

Additionally, if you did that inside a sub/function then those queues will go out of scope once the sub/function has exited and then they will be garbage collected if they are not referenced anywhere else.
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Author Comment

by:directxBOB
ID: 16898755
Well basically what I have is:

    /**
      * Create a new Queue
      */
    public Queue createQueue(string ID)
    {
      Queue myQueue;
      if (!queues.ContainsKey(ID))
      {
        myQueue= new Queue();
        queues.Add(ID, myQueue);
      }
      else
      {
        myQueue= (Queue)queues[ID];
      }
      return myQueue;
    }

Where basically I am looking to create X amount of Queues and put them into a Hashtable, then call other get and set methods to handle and maintain the queues.
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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 16899046
That'll work...
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