/// <summary>
/// Assigns a request to a group.
/// </summary>
/// <param name="client">The client.</param>
/// <param name="request">The request.</param>
public void UpdateGroup(ComDaClient client, SubscribeItemRequest request)
{
lock (m_lock)
{
// check for empty request.
if (request.MonitoredItems.Count == 0)
{
return;
}
request.Update();
// check if existing group can be used.
if (request.Group != null)
{
if (request.Group.ModifyItem(request.GroupItem, request.SamplingInterval, request.Deadband, request.Active))
{
if (request.GroupItem.Active != request.Active)
{
request.GroupItem.Active = request.Active;
request.GroupItem.ActiveChanged = true;
}
request.Group.SetMonitoredItems(request.GroupItem, request.MonitoredItems.ToArray());
return;
}
}
// clear link to existing group.
request.Group = null;
request.GroupItem = null;
// assign to an existing group.
for (int ii = 0; ii < m_groups.Count; ii++)
{
ComDaGroup group = m_groups[ii];
request.GroupItem = group.CreateItem(request.ItemId, request.SamplingInterval, request.Deadband, request.Active);
if (request.GroupItem != null)
{
request.Group = group;
request.Group.SetMonitoredItems(request.GroupItem, request.MonitoredItems.ToArray());
return;
}
}
// create a new group.
request.Group = new ComDaGroup(client, true);
request.GroupItem = request.Group.CreateItem(request.ItemId, request.SamplingInterval, request.Deadband, request.Active);
request.Group.SetMonitoredItems(request.GroupItem, request.MonitoredItems.ToArray());
m_groups.Add(request.Group);
}
}
/// <summary>
/// Finds the item value request for the specifed item.
/// </summary>
/// <param name="itemId">The item id.</param>
/// <param name="create">if set to <c>true</c> a new request is created if it does not exist.</param>
/// <returns>The subscribe item request.</returns>
public SubscribeItemRequest FindItemRequest(string itemId, bool create)
{
lock (m_lock)
{
SubscribeItemRequest subscribedItem = null;
if (!m_subscribedItems.TryGetValue(itemId, out subscribedItem))
{
if (!create)
{
return null;
}
subscribedItem = new SubscribeItemRequest(itemId);
m_subscribedItems.Add(itemId, subscribedItem);
}
return subscribedItem;
}
}
/// <summary>
/// Removes the specified item request.
/// </summary>
/// <param name="request">The request.</param>
/// <returns>True of the request was removed.</returns>
public bool Remove(SubscribeItemRequest request)
{
lock (m_lock)
{
if (request != null && request.ItemId != null)
{
return m_subscribedItems.Remove(request.ItemId);
}
return false;
}
}