/// <summary>
/// Start an XDB request.
/// </summary>
/// <param name="root"></param>
/// <param name="xtype"></param>
/// <param name="owner"></param>
/// <param name="ns"></param>
/// <param name="action"></param>
/// <param name="cb"></param>
/// <param name="cbArg"></param>
public void BeginXdb(XmlElement root, XdbType xtype,
string owner, string ns, XdbAction action,
XdbCB cb, object cbArg)
{
Debug.Assert(owner != null);
Debug.Assert(ns != null);
Xdb xdb = new Xdb(m_comp.Document);
xdb.NS = ns;
xdb.Type = xtype;
xdb.To = owner;
xdb.From = m_comp.ComponentID;
if (action != XdbAction.NONE)
xdb.Action = action;
if (root != null)
xdb.AddChild(root);
// if no callback, ignore response.
if (cb != null)
{
TrackerData td = new TrackerData();
td.cb = cb;
td.data = cbArg;
lock (m_pending)
{
m_pending[xdb.ID] = td;
}
}
m_comp.Write(xdb);
}
/// <summary>
/// Received an XDB element on Component.
/// Is this a response to a tracked request?
/// </summary>
/// <param name="sender"></param>
/// <param name="xdb"></param>
private void OnXdb(object sender, Xdb xdb)
{
string id = xdb.ID;
TrackerData td;
lock (m_pending)
{
td = (TrackerData) m_pending[id];
// this wasn't one that was being tracked.
if (td == null)
{
return;
}
m_pending.Remove(id);
}
// don't need to check for null. protected by assert below.
td.cb(this, xdb, td.data);
}