xenadmin/XenAdmin/SettingsPanels/ClusteringEditPage.cs

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using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
using XenAdmin.Actions;
using XenAdmin.Controls;
using XenAdmin.Core;
using XenAPI;

namespace XenAdmin.SettingsPanels
{
    public partial class ClusteringEditPage : UserControl, IEditPage
    {
        private Pool pool;
        private bool clusteringEnabled;

        public ClusteringEditPage()
        {
            InitializeComponent();
            Text = Messages.CLUSTERING;
        }

        public string SubText
        {
            get { return CheckBoxEnableClustering.Checked ? Messages.ENABLED : Messages.DISABLED; } 
        }

        public Image Image
        {
            get { return Properties.Resources._000_Storage_h32bit_16; }
        }

        public AsyncAction SaveSettings()
        {
            if (CheckBoxEnableClustering.Checked)
            {
                var network = ((NetworkComboBoxItem)comboBoxNetwork.SelectedItem).Network;
                if (network != null)
                {
                    return new EnableClusteringAction(pool, network);
                }
            }
            else
            {
                return new DisableClusteringAction(pool);
            }
            return null;
        }

        public void SetXenObjects(IXenObject orig, IXenObject clone)
        {
            pool = Helpers.GetPoolOfOne(clone.Connection);
            labelWarning.Visible = false;
            pictureBoxInfo1.Visible = false;

            var existingCluster = pool.Connection.Cache.Clusters.FirstOrDefault();
            clusteringEnabled = existingCluster != null;
            CheckBoxEnableClustering.Checked = clusteringEnabled;
            LoadNetworks(existingCluster);

            if (clusteringEnabled)
            {
                comboBoxNetwork.Enabled = labelNetwork.Enabled = false;
            }

            var gfs2Attached = clone.Connection.Cache.SRs.Any(sr => sr.GetSRType(true) == SR.SRTypes.gfs2 && !sr.IsDetached());

            if (clusteringEnabled && gfs2Attached)
            {
                DisableControls(Messages.GFS2_SR_ATTACHED);
            }

            if (!clusteringEnabled && pool.ha_enabled)
            {
                DisableControls(Messages.GFS2_HA_ENABLED);
            }

            labelHostCountWarning.Visible = clone.Connection.Cache.HostCount < 3;
        }

        public bool ValidToSave { get { return true; }}

        public void ShowLocalValidationMessages()
        {
           
        }

        public void Cleanup()
        {
            
        }

        public bool HasChanged
        {
            get
            {
                return clusteringEnabled != CheckBoxEnableClustering.Checked;
            }
        }

        #region PrivateMethods
        private void LoadNetworks(Cluster cluster)
        {
            comboBoxNetwork.IncludeOnlyEnabledNetworksInComboBox = false;
            comboBoxNetwork.IncludeOnlyNetworksWithIPAddresses = true;
            var clusterHostOnMaster = cluster == null
                ? null
                : pool.Connection.ResolveAll(cluster.cluster_hosts).FirstOrDefault(c => c.host.opaque_ref == pool.master.opaque_ref);
            
            comboBoxNetwork.PopulateComboBox(pool.Connection, item => clusterHostOnMaster != null && item.Network.PIFs.Any(pif => pif.opaque_ref == clusterHostOnMaster.PIF.opaque_ref));

            if (comboBoxNetwork.Items.Count == 0)
            {
                DisableControls(Messages.GFS2_NO_NETWORK);
            }

        }

        private void DisableControls(string message)
        {
            comboBoxNetwork.Enabled = labelNetwork.Enabled = CheckBoxEnableClustering.Enabled = false;
            labelWarning.Visible = pictureBoxInfo1.Visible = true;
            labelWarning.Text = message;
        }

        #endregion 
    }
}