Question

Threading in a C# application on asp .net 2.0. How do I thread a parameterized method?

Asked by: baijajusav

I have 2 applications. 1 is a java application that will connect to a mainframe and retrieve data from it and write it to a location on a given server. The variables used to do this are passed on the QueryString to the java servlet.

I have a .net application that calls the java application in order to queue up data that needs to be retrieved and written. Currently the task is taking a while as it waits for each UniqueIdentifier to be processed before processing the next one. I am exploring the possibility of using threading to accomplish this, but I'm running into a few snags.

So far, everything I've read on threading says the method you are wrapping in the ThreadStart delegate must return void and have 0 parameters. I don't have an issue w/ the void return, but I need to find a way to pass the function the thread runs 2 string values. The thread also writes to an onscreen control when it finishes. It's just a string of text. Will this operation hold up other threads? Lastly, I need to set a limit of 10 maximum concurrent threads as I don't want to bog down the java servlet application.

Here is what I have so far:

               ThreadStart ts = new ThreadStart( this.RetrieveData );
               Thread t = new Thread( ts  ) ;
               RetrieveData( "DataLocation", Uniqueidentifier );

Obviously I'm getting an error like: 'No overload for RetrieveData' matches delegate 'System.Threading.ThreadStart'.

I had read that the cache was thread safe. Is it possible for me to put a list of uniqueIdentifiers in the cache as well as have each thread write it's output to the cache?

Code examples are highly appreciated at this point. Thank you for your time.

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Asked On
2008-11-28 at 07:33:31ID23942319
Tags

c#, asp .net, .net, 2.0

,

I.E. 6

Topics

Programming for ASP.NET

,

C# Programming Language

Participating Experts
3
Points
500
Comments
3

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Answers

 

by: BillyDvDPosted on 2008-11-29 at 07:06:21ID: 23059870

what does the method signiture for 'RetrieveData' look like?

It should resemble code below...

You may need to create a struct to hold your data...

Please review psuedo code below....


ObjectInformation myobject = new ObjectInformation();
myobject.Guid = Uniqueidentifier;
myobject.Info = "DataLocation";
ThreadStart ts = new ThreadStart( this.RetrieveData , myobject );
Thread t = new Thread( ts  ) ;
t.Start();

struct ObjectInformation
{
public Guid guid;
public string Info;
}
 
void RetrieveData( object StateInfo )
{
// Here you will have to cast your object(s) back...
ObjectInformation MyInfo = (ObjectInformation)StateInfo as ObjectInformation;
Guid guid = MyInfo.guid;
string data = MyInfo.info;
}

                                              
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by: drichardsPosted on 2008-11-29 at 08:44:25ID: 23060153

I would say you have two options based on your apparent needs.

1) Create a new thread for each task.  If the tasks are very short and you have lots of them, this may not be the best approach.

2) Sumbit tasks onto the system thread pool.

As far as writing back to onscreen controls when you are done, it shouldn't hold up other threads, but you need to do it properly if the threads other than the main UI thread are trying to do operations on form controls.

You may also want to keep track of executing threads, which means keeping a list of task objects that have been submitted for execution and removing them from the list when they are complete.

//****** Code to create a thread for each task **********************
 
    // In your main code, you do this for each task.
    TaskInformation ti = new TaskInformation("data", "id2");
    Thread t = new Thread(ti.ThreadFunc1);
    t.Start();
 
 
    /// <summary>
    /// TaskInformation holds the function to be used by the thread 
    /// delegate and the parameters to be used by the actual work 
    /// function.  The thread function simply calls the work function
    /// with the correct parameters which have been stored as class 
    /// properties.  There can be other properties as well.  If the 
    /// class has a lot of members other than the parameters, it would 
    /// be better to break out the parameters into their own class and 
    /// use the ParameterizedThreadStart delegate instead.  Then you
    /// pass the parameter class in separately as an object.
    /// </summary>
    class TaskInformation
    {
        public string UniqueIdentifier
        {
            get { return _uniqueIdentifier; }
            set { _uniqueIdentifier = ValueType; }
        }
 
        public string Data
        {
            get { return _data; }
            set { _data = ValueType; }
        }
 
        public void ThreadFunc1()
        {
            RetrieveData(Data, UniqueIdentifier);
        }
 
        public void RetrieveData(string s1, string uniqueIdentifier)
        {
            Console.WriteLine(s1);
            Console.WriteLine(uniqueIdentifier);
        }
 
        public TaskInformation(string s1, string uniqueIdentifier)
        {
            _data = s1;
            _uniqueIdentifier = uniqueIdentifier;
        }
 
        private string _uniqueIdentifier;
        private string _data;
    }
 
 
//****** Use  system thread pool for each task **********************
 
    // In main code...
    TaskInformation ti = new TaskInformation("data", "id2");
    ThreadPool.QueueUserWorkItem(new WaitCallback(ti.ThreadFunc2));
 
 
        // ThreadFunc2 is just ThreadFunc1 but with a parameter.
        // In TaskInformation, replace ThreadFunc1 with...
        public void ThreadFunc2(object info)
        {
            RetrieveData(Data, UniqueIdentifier);
        }
                                              
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