/// <summary>
/// Reserves the requested VMs.
/// </summary>
/// <param name="sessionId">The session id.</param>
/// <param name="credential">The user requesting the reservation.</param>
/// <param name="requestedVMs">The requested VMs.</param>
/// <param name="requiredVMQuantity">The required VM quantity.</param>
/// <returns></returns>
public static bool Reserve(string sessionId, UserCredential credential, RequestedVMDictionary requestedVMs, VMQuantityDictionary requiredVMQuantity)
{
if (requiredVMQuantity == null)
{
throw new ArgumentNullException("requiredVMQuantity");
}
if (requestedVMs == null)
{
throw new ArgumentNullException("requestedVMs");
}
DateTime currentTime = DateTime.Now;
TraceFactory.Logger.Debug(requiredVMQuantity.ToString());
LockToken lockToken = new GlobalLockToken("VirtualMachineReservation", new TimeSpan(0, 1, 0), new TimeSpan(0, 2, 0));
ExecutionServices.CriticalSection.Run(lockToken, () =>
{
// Need to work with a master list of VMs. If the requested set is empty, then the master list
// will come from the database. Otherwise it will come from the requested set.
List <VirtualMachine> masterMachineList = GetMasterList(credential, requestedVMs);
// Copy the required VMs (by Platform) to their own dictionary as items will be removed.
Dictionary <string, int> remainingPlatforms = requiredVMQuantity.ToDictionary(entry => entry.Key, entry => entry.Value);
using (AssetInventoryContext context = DbConnect.AssetInventoryContext())
{
// Iterate over each item in the required VM dictionary and process
while (remainingPlatforms.Count > 0)
{
// Get the target platform and required count for each entry
string targetPlatformId = remainingPlatforms.ElementAt(0).Key;
int targetPlatformCount = remainingPlatforms.ElementAt(0).Value;
TraceFactory.Logger.Debug("Target Platform {0} and machine count {1}".FormatWith(targetPlatformId, targetPlatformCount));
List <VirtualMachineSelection> machineSelections = GetMachineSelections(targetPlatformId, masterMachineList, remainingPlatforms);
// Now try to reserve the VMs. If the required VMs are more than the available, then
// this is an error. Otherwise work down the list for the number of VMs required. Since
// they are now ordered the VMs selected will be the least unique and those will more
// special associations will be further down the list.
TraceFactory.Logger.Debug("Machine Platform: {0} - {1} Requested, {2} Available".FormatWith(targetPlatformId, targetPlatformCount, machineSelections.Count));
if (machineSelections.Count >= targetPlatformCount)
{
for (int i = 0; i < targetPlatformCount; i++)
{
Reserve
(
context,
machineSelections[i].Machine.Name,
targetPlatformId,
currentTime,
sessionId,
GlobalSettings.Environment
);
//Once the machine is reserved, remove it from the master list.
masterMachineList.Remove(machineSelections[i].Machine);
TraceFactory.Logger.Debug("Host {0} reserved".FormatWith(machineSelections[i].Machine.Name));
}
}
else
{
throw new VMInventoryException("Only {0} {1} machines available of {2} requested."
.FormatWith(machineSelections.Count, targetPlatformId, targetPlatformCount));
}
// Remove the platform that was just processed
remainingPlatforms.Remove(targetPlatformId);
}
// Save all the final changes. Do this at the end so that if there
// is a problem, there is nothing to roll back.
context.SaveChanges();
} //AssetInventoryContext
}); //reservation.Run
return(true);
}
/// <summary>
/// Reserves the requested block of VMs.
/// </summary>
/// <param name="sessionId">The session Id.</param>
/// <param name="credential">Credentials for reserving the VMs</param>
/// <param name="requestedVMs">The platforms of the requested VMs.</param>
/// <param name="requiredVMQuantity">The quantity per platform of requested VMs.</param>
/// <returns>Whether or not the requested VMs were reserved.</returns>
public static Collection <VirtualMachine> RequestVMs(string sessionId, UserCredential credential, RequestedVMDictionary requestedVMs, VMQuantityDictionary requiredVMQuantity)
{
bool reserved;
lock (_resourceLock)
{
TraceFactory.Logger.Debug("Reserving virtual machines...");
reserved = VMInventoryManager.Reserve(sessionId, credential, requestedVMs, requiredVMQuantity);
}
if (!reserved)
{
throw new VMInventoryException("Unable to reserve requested virtual machines");
}
var reservedVMs = VMInventoryManager.GetReservedList(sessionId);
TraceFactory.Logger.Info("Successfully reserved {0} virtual machines".FormatWith(reservedVMs.Count));
return(reservedVMs);
}
