private static void ConnectTransport()
{
if (IsTransportConnected)
{
throw new System.InvalidOperationException(SR.Get(SRID.MediaSystem_OutOfOrderConnectOrDisconnect));
}
//
// Create a default transport to be used by this media system.
// If creation fails, fall back to a local transport.
//
HRESULT.Check(UnsafeNativeMethods.WgxConnection_Create(
false, // false means asynchronous transport
out s_pConnection));
// Create service channel used by global glyph cache. This channel is
// the first channel created for the app, and by creating it with
// a null channel reference it creates a new partition.
// All subsequent channel creates will pass in a reference to this
// channel thus using its partition.
s_serviceChannel = new DUCE.Channel(
null,
false, // not out of band
s_pConnection,
false);
IsTransportConnected = true;
}
internal DUCE.Channel AllocateSyncChannel()
{
DUCE.Channel syncChannel;
if (_pSyncConnection == IntPtr.Zero)
{
HRESULT.Check(UnsafeNativeMethods.WgxConnection_Create(
true, // true means synchronous transport
out _pSyncConnection));
}
if (_freeSyncChannels == null)
{
//
// Ensure the free sync channels queue...
//
_freeSyncChannels = new Queue <DUCE.Channel>(3);
}
if (_freeSyncChannels.Count > 0)
{
//
// If there is a free sync channel in the queue, we're done:
//
return(_freeSyncChannels.Dequeue());
}
else
{
//
// Otherwise, create a new channel. We will try to cache it
// when the ReleaseSyncChannel call is made. Also ensure the
// synchronous service channel and glyph cache.
//
if (_syncServiceChannel == null)
{
_syncServiceChannel = new DUCE.Channel(
null,
false, // not out of band
_pSyncConnection,
true // synchronous
);
}
syncChannel = new DUCE.Channel(
_syncServiceChannel,
false, // not out of band
_pSyncConnection,
true // synchronous
);
return(syncChannel);
}
}