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Timeout Functions

, 11 Dec 2008
This article explains about executing a function within a time limit. Also includes a helper class which helps to implement timeout functions easily. This article deals with running multiple timeout processes each with time limit.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using TimeoutFunctions;

namespace TimeoutFunctions.Sample
{
    public partial class TimeoutFunctionsSample : Form
    {
        public TimeoutFunctionsSample() {
            InitializeComponent();
        }

        private void btnStart_Click(object sender, EventArgs e) {
            double timeoutInSeconds;
            if (!double.TryParse(txtSynchronousProcessTimeout.Text, out timeoutInSeconds))
                ShowError("Invalid value entered");
            else {
                ClearResults();
                TimeoutProcess process = new TimeoutProcess();
                WriteToResults("Starting process");
                bool status = process.Start(null, TimeSpan.FromSeconds(timeoutInSeconds), DoTimeoutProcess);
                if (!status)
                    WriteToResults("Timedout!");
            }
        }

        void ShowError(string msg) {
            MessageBox.Show(msg, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

        void DoTimeoutProcess(object arg) {
            for (int i = 0; i < 10; i++) {
                WriteToResults("Processing task {0}", i.ToString());
                Thread.Sleep(1000);
            }
        }
        readonly static object locker = new object();
        void WriteToResults(string msgFormat,params string[] args) {
            string msg = string.Format(msgFormat, args);
            this.BeginInvoke((MethodInvoker)delegate
            {
                lock(locker)
                    this.lstResults.Items.Add(msg);
            });
        }

        void ClearResults() {
            lstResults.Items.Clear();
        }

        TimeoutProcess asyncProcess = new TimeoutProcess();
        private void btnStartAsyncProcesses_Click(object sender, EventArgs e) {
            ClearResults();
            int processCount;
            double timeoutInSeconds;
            if (!int.TryParse(txtNoOfProcesses.Text, out processCount))
                ShowError("Invalid process count");
            else if (!double.TryParse(txtAsyncProcessTimeout.Text, out timeoutInSeconds))
                ShowError("Invalid async process timeout");
            else {
                asyncProcess.AsyncProcessCompleted += asyncProcess_AsyncProcessCompleted;
                for (int i = 0; i < processCount; i++) {
                    asyncProcess.StartAsync(string.Format("Process {0}",i), 
                        TimeSpan.FromSeconds(timeoutInSeconds), DoTimeoutProcess);
                }
            }
        }

        void asyncProcess_AsyncProcessCompleted(object sender, AsyncProcessEventArgs e) {
            string processName = (string)e.UserState;
            if (!e.HasProcessCompleted)
                WriteToResults(string.Format("{0} timedout", processName));
            WriteToResults("{0} async processes executing", asyncProcess.AsyncProcessCount.ToString());
        }
    }
}

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

N a v a n e e t h
Software Developer ThoughtWorks
India India
Call me Navaneeth Some years ago--never mind how long precisely, I was doing programs with C and C++. When .NET came, I started with C#,ASP.NET and SQL Server.

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Web03 | 2.8.140721.1 | Last Updated 11 Dec 2008
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