source: branches/HeuristicLab.Hive.Azure/HeuristicLab.Clients.Hive.CloudManager/3.3/Views/CloudResourcesView.cs @ 7324

using System;
using System.Diagnostics;
using System.Threading;
using System.Timers;
using System.Windows.Forms;
using HeuristicLab.Clients.Hive.CloudManager.Model;
using HeuristicLab.Core;
using HeuristicLab.Core.Views;
using HeuristicLab.MainForm;

namespace HeuristicLab.Clients.Hive.CloudManager.Views {
  [View("Cloud Resources View")]
  [Content(typeof(IItemList<Subscription>), IsDefaultView = true)]
  public partial class CloudResourcesView : ItemView, IDisposable {
    private System.Timers.Timer timer = new System.Timers.Timer();
    private int updateInterval = 15000;
    private DateTime dueTime;
    private const int subscriptionImageIndex = 0;
    private const int serviceImageIndex = 1;

    public new IItemList<Subscription> Content {
      get { return (IItemList<Subscription>)base.Content; }
      set { base.Content = value; }
    }

    public CloudResourcesView() {
      InitializeComponent();

      treeCloudResources.ImageList.Images.Add(HeuristicLab.Common.Resources.VSImageLibrary.NetworkCenterLarge);
      treeCloudResources.ImageList.Images.Add(HeuristicLab.Common.Resources.VSImageLibrary.MonitorLarge);

      Content = CloudManagerClient.Instance.Subscriptions;
      CloudManagerClient.Instance.Refreshing += new EventHandler(Instance_Refreshing);
      CloudManagerClient.Instance.Refreshed += new EventHandler(Instance_Refreshed);

      timer.AutoReset = true;
      timer.Interval = 1000;
      timer.Elapsed += PerformUpdate;
      timer.Start();
      dueTime = DateTime.Now.AddMilliseconds(updateInterval);
    }

    public new void Dispose() {
      CloudManagerClient.Instance.Refreshing -= new EventHandler(Instance_Refreshing);
      CloudManagerClient.Instance.Refreshed -= new EventHandler(Instance_Refreshed);
      timer.Dispose();
      Debug.WriteLine("Dispose");
    }

    #region Register Content Events
    protected override void DeregisterContentEvents() {
      Content.ItemsAdded -= new Collections.CollectionItemsChangedEventHandler<Collections.IndexedItem<Subscription>>(Content_ItemsAdded);
      Content.ItemsRemoved -= new Collections.CollectionItemsChangedEventHandler<Collections.IndexedItem<Subscription>>(Content_ItemsRemoved);
      base.DeregisterContentEvents();
    }
    protected override void RegisterContentEvents() {
      base.RegisterContentEvents();
      Content.ItemsAdded += new Collections.CollectionItemsChangedEventHandler<Collections.IndexedItem<Subscription>>(Content_ItemsAdded);
      Content.ItemsRemoved += new Collections.CollectionItemsChangedEventHandler<Collections.IndexedItem<Subscription>>(Content_ItemsRemoved);
    }
    #endregion

    protected override void SetEnabledStateOfControls() {
      base.SetEnabledStateOfControls();
      if (Content == null || Content.Count == 0) {
        btnAddSlaveService.Enabled = false;
        btnDelete.Enabled = false;
        btnSave.Enabled = false;
      } else {
        btnAddSlaveService.Enabled = true;
        btnDelete.Enabled = true;
        btnSave.Enabled = true;
      }
    }

    protected override void OnContentChanged() {
      base.OnContentChanged();
      SetEnabledStateOfControls();
      if (Content == null) {
        //slaveView.Content = null;
        treeCloudResources.Nodes.Clear();
      } else {
        treeCloudResources.Nodes.Clear();
        foreach (Subscription sub in Content) {
          TreeNode tn = new TreeNode();
          tn.Tag = sub;
          tn.Text = sub.SubscriptionName;
          tn.ImageIndex = subscriptionImageIndex;
          tn.SelectedImageIndex = tn.ImageIndex;
          treeCloudResources.Nodes.Add(tn);
        }
      }
    }

    private void Instance_Refreshing(object sender, EventArgs e) {
      Debug.WriteLine("Instance_Refreshing");
    }

    private void Instance_Refreshed(object sender, EventArgs e) {
      Debug.WriteLine("Instance_Refreshed");
    }

    private void Content_ItemsRemoved(object sender, Collections.CollectionItemsChangedEventArgs<Collections.IndexedItem<Subscription>> e) {
      OnContentChanged();
    }

    private void Content_ItemsAdded(object sender, Collections.CollectionItemsChangedEventArgs<Collections.IndexedItem<Subscription>> e) {
      OnContentChanged();
    }

    private void PerformUpdate(object sender, ElapsedEventArgs e) {
      TimeSpan timeToRefresh = dueTime - DateTime.Now;

      if (timeToRefresh.Seconds >= 0) {
        this.Invoke((MethodInvoker)delegate { lblRefresh.Text = "Done. " + timeToRefresh.Seconds + "s to next refresh."; });
      } else {
        timer.Stop();
        this.Invoke((MethodInvoker)delegate { lblRefresh.Text = "Refreshing data ..."; });

        // statistics
        Debug.WriteLine("perform update");
        Thread.Sleep(1000);

        dueTime = DateTime.Now.AddMilliseconds(updateInterval);
        timer.Start();
      }
    }

    private void btnAddSubscription_Click(object sender, EventArgs e) {
      using (var form = new AddSubscriptionDialog()) {
        form.ShowDialog();
        if (!form.ErrorOccured) {
          if (form.Subscription != null) {
            Subscription sub = form.Subscription;
            CloudManagerClient.Instance.Add(sub);
          }
        }
      }
    }
  }
}