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using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Pipes;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Tango.Core;
namespace Tango.PPC.Common.WatchDog
{
public class WatchDogClient : ExtendedObject
{
public event EventHandler ServerNotResponding;
private NamedPipeClientStream _client;
private StreamReader _reader;
private StreamWriter _writer;
private Thread _thread;
public bool IsStarted { get; private set; }
public TimeSpan Interval { get; set; }
public WatchDogClient()
{
Interval = TimeSpan.FromSeconds(5);
}
public void Start()
{
if (!IsStarted)
{
LogManager.Log("Starting watchdog client...");
IsStarted = true;
_thread = new Thread(ThreadMethod);
_thread.IsBackground = true;
_thread.Start();
}
}
private void ThreadMethod()
{
try
{
LogManager.Log("Watchdog client started.");
while (IsStarted)
{
_client = new NamedPipeClientStream("Tango_Watch_Dog_Pipe");
_client.Connect(5000);
_reader = new StreamReader(_client);
_writer = new StreamWriter(_client);
_writer.WriteLine("ping");
_writer.Flush();
var line = _reader.ReadLine();
if (line != "ping")
{
LogManager.Log("Watchdog server not found. Raising notification...");
try
{
IsStarted = false;
_client.Dispose();
}
catch { }
ServerNotResponding?.Invoke(this, new EventArgs());
return;
}
_client.Dispose();
Thread.Sleep(Interval);
}
}
catch (Exception ex)
{
IsStarted = false;
LogManager.Log(ex, "Error in watchdog client.");
ServerNotResponding?.Invoke(this, new EventArgs());
}
}
public void Stop()
{
IsStarted = false;
_client.Dispose();
}
}
}
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