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 *     following disclaimer. 
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 *     following disclaimer in the documentation and/or other 
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 * 
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using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using XenAPI;

namespace XenAdmin.Controls.Ballooning
{
    public class VMMemoryControlsBase : UserControl
    {
        protected List<VM> vms;
        protected VM vm0;
        protected List<VM_metrics> vm_metrics = new List<VM_metrics>();  // metrics for all the VMs
        public virtual List<VM> VMs
        {
            set
            {
                vms = value;
                vm0 = vms[0];  // just an abbreviation for when we don't care which VM we look at
                vm_metrics = new List<VM_metrics>(vms.Count);
                foreach (VM vm in vms)
                    vm_metrics.Add(vm.Connection.Resolve(vm.metrics));
            }
        }

        protected long CalcMemoryUsed()
        {
            long memoryUsed = 0;

            if (vm0.power_state == vm_power_state.Running || vm0.power_state == vm_power_state.Paused)
            {
                // Calculate the average memory used by these VMs
                int count = 0;
                foreach (VM_metrics vm_metric in vm_metrics)
                {
                    if (vm_metric != null)
                    {
                        memoryUsed += vm_metric.memory_actual;
                        ++count;
                    }
                }
                if (count > 0)
                    memoryUsed /= count;
            }

            return memoryUsed;
        }
    }
}