source: branches/3.3-Hive/sources/HeuristicLab.Hive/HeuristicLab.Hive.Experiment/3.3/JobResultPoller.cs @ 4423

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using HeuristicLab.Hive.Contracts;
using HeuristicLab.Hive.Contracts.Interfaces;
using HeuristicLab.Hive.Contracts.BusinessObjects;
using HeuristicLab.Hive.Contracts.ResponseObjects;
using HeuristicLab.Common;

namespace HeuristicLab.Hive.Experiment {
  internal class JobResultPoller {
    private bool stopRequested { get; set; }
    private AutoResetEvent waitHandle;
    private Thread thread;

    private HiveJob hiveJob;
    public HiveJob HiveJob {
      get { return hiveJob; }
      set { hiveJob = value; }
    }

    private TimeSpan interval;
    public TimeSpan Interval {
      get { return interval; }
      set { interval = value; }
    }

    private bool isPolling;
    public bool IsPolling {
      get { return isPolling; }
      set {
        if (isPolling != value) {
          isPolling = value;
          OnIsPollingChanged();
        }
      }
    }

    public JobResultPoller(HiveJob hiveJob, TimeSpan interval) {
      this.isPolling = false;
      this.hiveJob = hiveJob;
      this.interval = interval;
    }

    public void Start() {
      stopRequested = false;
      thread = new Thread(RunPolling);
      thread.Start();
      IsPolling = true;
    }

    public void Stop() {
      // use AutoResetEvent.Set instead if Thread.Interrupt because its much cleaner
      stopRequested = true;
      waitHandle.Set();
      IsPolling = false;
      thread = null;
    }

    public void RunPolling() {
      try {
        waitHandle = new AutoResetEvent(false);
        while (!stopRequested) {
          OnPollingStarted();
          FetchJobResults();
          OnPollingFinished();
          waitHandle.WaitOne(Interval);
        }
        waitHandle.Close();
      }
      catch (Exception e) {
        OnExceptionOccured(e);
      }
    }

    private void FetchJobResults() {
      using (Disposable<IClientFacade> service = ServiceLocator.Instance.StreamedClientFacadePool.GetService()) {
        ResponseObject<JobResultList> response = service.Obj.GetChildJobResults(hiveJob.JobDto.Id, true, true);
        if (response.StatusMessage == ResponseStatus.Ok) {
          OnJobResultsReceived(response.Obj);
        } else {
          throw new JobResultPollingException(response.StatusMessage.ToString());
        }
      }
    }

    public event EventHandler<EventArgs<JobResultList>> JobResultsReceived;
    private void OnJobResultsReceived(JobResultList jobResults) {
      var handler = JobResultsReceived;
      if (handler != null) handler(this, new EventArgs<JobResultList>(jobResults));
    }

    public event EventHandler<EventArgs<Exception>> ExceptionOccured;
    private void OnExceptionOccured(Exception e) {
      var handler = ExceptionOccured;
      if (handler != null) handler(this, new EventArgs<Exception>(e));
    }

    public event EventHandler IsPollingChanged;
    private void OnIsPollingChanged() {
      var handler = IsPollingChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler PollingStarted;
    private void OnPollingStarted() {
      var handler = PollingStarted;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler PollingFinished;
    private void OnPollingFinished() {
      var handler = PollingFinished;
      if (handler != null) handler(this, EventArgs.Empty);
    }
  }
}