private void QueryThreadChanged(object sender, EventArgs e)
{
QueryThread messenger = (QueryThread)sender;
QueryThreadPoolEventArgs arg = (QueryThreadPoolEventArgs)e;
string siteId = messenger.Connection.DataSource.SiteId.Id;
if (arg.ConnectionEventType == QueryThreadPoolEventArgs.ConnectionChangeEventType.ConnectionAvailable)
{
messenger.CompleteTimestamp = DateTime.Now;
messenger.Connection.IsAvailable = true;
QueryThread qt;
if ((qt = _queue.dequeue(siteId)) != null) // if there are queued items for this cxn site
{
qt.setConnection(messenger.Connection);
qt.DequeueTimestamp = DateTime.Now;
qt.Changed += new EventHandler(QueryThreadChanged);
qt.execute();
}
}
else if (arg.ConnectionEventType == QueryThreadPoolEventArgs.ConnectionChangeEventType.Disconnected)
{
_connections[siteId].Remove(messenger.Connection);
_currentActiveConnections--;
// re-allocate connection? some out of process algorithm to re-use?
}
}
public void execute()
{
if (dao == null) // This data source has no DAO for this data domain
{
return;
}
Type theClass = dao.GetType();
Type[] theParamTypes = new Type[this.args.Length];
for (int i = 0; i < args.Length; i++)
{
if (args[i] == null)
{
throw new MdoException(MdoExceptionCode.ARGUMENT_NULL, "Cannot have null args in QueryThread");
}
else
{
theParamTypes[i] = args[i].GetType();
}
}
MethodInfo theMethod = theClass.GetMethod(methodName, theParamTypes);
try
{
// set the symbol table set for the connection elsewhere
//if (this.Connection.IsPooled && this.Connection is vista.VistaConnection && this.Connection.Session != null)
//{
// ((vista.VistaConnection)this.Connection).setSymbolTable();
//}
result = theMethod.Invoke(dao, BindingFlags.InvokeMethod, null, args, null);
}
catch (TargetInvocationException tie)
{
result = tie.InnerException;
}
catch (Exception e)
{
result = e;
}
finally
{
// on cleanup - need to get/reset the symbol table - TBD: will some type of manager retrieve it?
//if (this.Connection.IsPooled && this.Connection is vista.VistaConnection)
//{
// ((vista.VistaConnection)this.Connection).getSerializedSymbolTable();
//}
// done with symbol table
QueryThreadPoolEventArgs e = new QueryThreadPoolEventArgs();
e.ConnectionEventType = QueryThreadPoolEventArgs.ConnectionChangeEventType.ConnectionAvailable;
OnChanged(e);
}
}
public void queue(QueryThread qt, string siteId)
{
lock (_connectionQueues)
{
if (!_connectionQueues.ContainsKey(siteId))
{
_connectionQueues.Add(siteId, new Queue<QueryThread>());
}
_connectionQueues[siteId].Enqueue(qt);
}
QueryThreadPoolEventArgs e = new QueryThreadPoolEventArgs()
{
QueueEventType = QueryThreadPoolEventArgs.QueueChangeEventType.QueryAdded,
SiteId = siteId
};
QueueChanged(e);
}
public void queue(QueryThread qt, string siteId)
{
lock (_connectionQueues)
{
if (!_connectionQueues.ContainsKey(siteId))
{
_connectionQueues.Add(siteId, new Queue <QueryThread>());
}
_connectionQueues[siteId].Enqueue(qt);
}
QueryThreadPoolEventArgs e = new QueryThreadPoolEventArgs()
{
QueueEventType = QueryThreadPoolEventArgs.QueueChangeEventType.QueryAdded,
SiteId = siteId
};
QueueChanged(e);
}
private void QueueChanged(object sender, EventArgs e)
{
QueryThreadPoolEventArgs arg = (QueryThreadPoolEventArgs)e;
if (arg.QueueEventType == QueryThreadPoolEventArgs.QueueChangeEventType.QueryAdded)
{
// if connection available then execute
AbstractConnection cxn = getAvailableConnection(arg.SiteId);
if (cxn != null)
{
QueryThread qt = _queue.dequeue(arg.SiteId);
qt.DequeueTimestamp = DateTime.Now;
qt.setConnection(cxn);
qt.Changed += new EventHandler(QueryThreadChanged);
qt.execute();
}
}
}
public void execute()
{
if (dao == null) // This data source has no DAO for this data domain
{
return;
}
Type theClass = dao.GetType();
Type[] theParamTypes = new Type[this.args.Length];
for (int i = 0; i < args.Length; i++)
{
if (args[i] == null)
{
throw new MdoException(MdoExceptionCode.ARGUMENT_NULL, "Cannot have null args in QueryThread");
}
else
{
theParamTypes[i] = args[i].GetType();
}
}
MethodInfo theMethod = theClass.GetMethod(methodName, theParamTypes);
try
{
result = theMethod.Invoke(dao, BindingFlags.InvokeMethod, null, args, null);
}
catch (TargetInvocationException tie)
{
result = tie.InnerException;
}
catch (Exception e)
{
result = e;
}
finally
{
QueryThreadPoolEventArgs e = new QueryThreadPoolEventArgs();
e.ConnectionEventType = QueryThreadPoolEventArgs.ConnectionChangeEventType.ConnectionAvailable;
OnChanged(e);
}
}
