//======================================================================
// Constructor
/// <summary>
/// Initializes a new instance of a subscription.
/// </summary>
internal Subscription(
Server server,
OpcXml.Da10.Service proxy,
SubscriptionState state,
int filters)
{
if (server == null)
{
throw new ArgumentNullException("server");
}
if (proxy == null)
{
throw new ArgumentNullException("proxy");
}
m_server = server;
m_proxy = proxy;
m_filters = filters;
m_state = (state != null)?(SubscriptionState)state.Clone():new SubscriptionState();
if (m_state.Name == null || m_state.Name == "")
{
lock (typeof(Subscription))
{
m_state.Name = String.Format("Subscription{0,3:000}", ++m_counter);
}
}
}
public ISubscription CreateSubscription(SubscriptionState state)
{
if (state == null)
{
throw new ArgumentNullException("state");
}
lock (this)
{
if (m_server == null)
{
throw new NotConnectedException();
}
SubscriptionState subscriptionState = (SubscriptionState)state.Clone();
Guid riid = typeof(IOPCItemMgt).GUID;
object ppUnk = null;
int phServerGroup = 0;
int pRevisedUpdateRate = 0;
GCHandle gCHandle = GCHandle.Alloc(subscriptionState.Deadband, GCHandleType.Pinned);
try
{
((IOPCServer)m_server).AddGroup((subscriptionState.Name != null) ? subscriptionState.Name : "", subscriptionState.Active ? 1 : 0, subscriptionState.UpdateRate, 0, IntPtr.Zero, gCHandle.AddrOfPinnedObject(), OpcCom.Interop.GetLocale(subscriptionState.Locale), out phServerGroup, out pRevisedUpdateRate, ref riid, out ppUnk);
}
catch (Exception e)
{
throw OpcCom.Interop.CreateException("IOPCServer.AddGroup", e);
}
finally
{
if (gCHandle.IsAllocated)
{
gCHandle.Free();
}
}
try
{
int pdwRevisedKeepAliveTime = 0;
((IOPCGroupStateMgt2)ppUnk).SetKeepAlive(subscriptionState.KeepAlive, out pdwRevisedKeepAliveTime);
subscriptionState.KeepAlive = pdwRevisedKeepAliveTime;
}
catch
{
subscriptionState.KeepAlive = 0;
}
subscriptionState.ServerHandle = phServerGroup;
if (pRevisedUpdateRate > subscriptionState.UpdateRate)
{
subscriptionState.UpdateRate = pRevisedUpdateRate;
}
Subscription subscription = CreateSubscription(ppUnk, subscriptionState, m_filters);
m_subscriptions[phServerGroup] = subscription;
return(subscription);
}
}
//======================================================================
// CreateSubscription
/// <summary>
/// Creates a new subscription.
/// </summary>
/// <param name="state">The initial state of the subscription.</param>
/// <returns>The new subscription object.</returns>
public ISubscription CreateSubscription(SubscriptionState state)
{
if (state == null)
{
throw new ArgumentNullException("state");
}
lock (this)
{
if (m_server == null)
{
throw new NotConnectedException();
}
// copy the subscription state.
SubscriptionState result = (Opc.Da.SubscriptionState)state.Clone();
// initialize arguments.
Guid iid = typeof(IOPCItemMgt).GUID;
object group = null;
int serverHandle = 0;
int revisedUpdateRate = 0;
GCHandle hDeadband = GCHandle.Alloc(result.Deadband, GCHandleType.Pinned);
// invoke COM method.
try
{
((IOPCServer)m_server).AddGroup(
(result.Name != null)?result.Name:"",
(result.Active)?1:0,
result.UpdateRate,
0,
IntPtr.Zero,
hDeadband.AddrOfPinnedObject(),
OpcCom.Interop.GetLocale(result.Locale),
out serverHandle,
out revisedUpdateRate,
ref iid,
out group);
}
catch (Exception e)
{
throw OpcCom.Interop.CreateException("IOPCServer.AddGroup", e);
}
finally
{
if (hDeadband.IsAllocated)
{
hDeadband.Free();
}
}
// set the keep alive rate if requested.
try
{
int keepAlive = 0;
((IOPCGroupStateMgt2)group).SetKeepAlive(result.KeepAlive, out keepAlive);
result.KeepAlive = keepAlive;
}
catch
{
result.KeepAlive = 0;
}
// save server handle.
result.ServerHandle = serverHandle;
// set the revised update rate.
if (revisedUpdateRate > result.UpdateRate)
{
result.UpdateRate = revisedUpdateRate;
}
// create the subscription object.
OpcCom.Da.Subscription subscription = CreateSubscription(group, result, m_filters);
// index by server handle.
m_subscriptions[serverHandle] = subscription;
// return subscription.
return(subscription);
}
}
