xenadmin/XenAdmin/Wizards/PatchingWizard/PlanActions/PlanActionWithSession.cs

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using System;
using System.Collections.Generic;
using System.Threading;
using XenAdmin.Network;
using XenAPI;

namespace XenAdmin.Wizards.PatchingWizard.PlanActions
{
    public abstract class PlanActionWithSession : PlanAction
    {
        protected readonly IXenConnection Connection;

        protected PlanActionWithSession(IXenConnection connection, String description, int offset)
            : base(description)
        {
            if(connection==null)
                throw new ArgumentException(this.GetType().Name+" connection null");
            this.Connection = connection;
        }

        protected PlanActionWithSession(IXenConnection connection, String description)
            : this(connection, description, 1)
        {
        }

        protected T TryResolveWithTimeout<T>(XenRef<T> t) where T : XenObject<T>
        {
            log.DebugFormat("Resolving {0} {1}", t, t.opaque_ref);
            int timeout = 120; // two minutes;

            while (timeout > 0)
            {
                T obj = Connection.Resolve(t);
                if (obj != null)
                    return obj;

                Thread.Sleep(1000);
                timeout = timeout - 1;
            }

            if (typeof(T) == typeof(Host))
                throw new Failure(Failure.HOST_OFFLINE);
            throw new Failure(Failure.HANDLE_INVALID, typeof(T).Name, t.opaque_ref);
        }

        protected abstract void RunWithSession(ref Session session);

        protected sealed override void _Run()
        {
            Session session = Connection.DuplicateSession();

            RunWithSession(ref session);
        }

        public sealed override void Run()
        {
            base.Run();
        }
    }
}