/// <inheritdoc />
public override void Execute(OpcSession session)
{
Logger.Debug($"Start action {Description} on '{session.EndpointUrl}'");
if (OpcUaNodeId == null)
{
// get the NodeId
OpcUaNodeId = session.GetNodeIdFromId(OpcNodeId);
}
// read the node info
Node node = session.OpcUaClientSession.ReadNode(OpcUaNodeId);
// report the node info
Logger.Debug($"Action ({Description}) Node DisplayName is '{node.DisplayName}'");
Logger.Debug($"Action ({Description}) Node Description is '{node.Description}'");
// read the value
DataValue dataValue = session.OpcUaClientSession.ReadValue(OpcUaNodeId);
try
{
Value = dataValue.Value;
}
catch (Exception e)
{
Logger.Warning(e, $"Cannot convert type of read value.");
Value = "Cannot convert type of read value.";
}
// report the node value
Logger.Debug($"Action ({Description}) Node data value is '{dataValue.Value}'");
}
/// <summary>
/// Create the data structures to manage actions.
/// </summary>
public static async Task <bool> CreateOpcActionDataAsync()
{
try
{
await OpcActionListSemaphore.WaitAsync();
await OpcSessionsListSemaphore.WaitAsync();
// create actions out of the configuration
var uniqueSessionInfo = _actionConfiguration.Select(n => new Tuple <Uri, bool>(n.EndpointUrl, n.UseSecurity)).Distinct();
foreach (var sessionInfo in uniqueSessionInfo)
{
// create new session info.
OpcSession opcSession = new OpcSession(sessionInfo.Item1, sessionInfo.Item2, OpcSessionCreationTimeout);
// add all actions to the session
List <OpcAction> actionsOnEndpoint = new List <OpcAction>();
var endpointConfigs = _actionConfiguration.Where(c => c.EndpointUrl == sessionInfo.Item1 && c.UseSecurity == sessionInfo.Item2);
foreach (var config in endpointConfigs)
{
config?.Read.ForEach(a => opcSession.OpcActions.Add(new OpcReadAction(config.EndpointUrl, a)));
config?.Test.ForEach(a => opcSession.OpcActions.Add(new OpcTestAction(config.EndpointUrl, a)));
}
// report actions
Logger.Information($"Actions on '{opcSession.EndpointUrl.AbsoluteUri}' {(opcSession.UseSecurity ? "with" : "without")} security.");
foreach (var action in opcSession.OpcActions)
{
Logger.Information($"{action.Description}, recurring each: {action.Interval} sec");
}
// add session
OpcSessions.Add(opcSession);
}
}
catch (Exception e)
{
Logger.Fatal(e, "Creation of the internal OPC management structures failed. Exiting...");
return(false);
}
finally
{
OpcSessionsListSemaphore.Release();
OpcActionListSemaphore.Release();
}
return(true);
}
/// <summary>
/// Shutdown all sessions.
/// </summary>
public async static Task SessionShutdownAsync()
{
try
{
while (OpcSessions.Count > 0)
{
OpcSession opcSession = null;
try
{
await OpcSessionsListSemaphore.WaitAsync();
opcSession = OpcSessions.ElementAt(0);
OpcSessions.RemoveAt(0);
}
finally
{
OpcSessionsListSemaphore.Release();
}
await opcSession?.ShutdownAsync();
}
}
catch (Exception e)
{
Logger.Fatal(e, "Failed to shutdown all sessions.");
}
// wait and continue after a while
uint maxTries = ShutdownRetryCount;
while (true)
{
int sessionCount = OpcSessions.Count;
if (sessionCount == 0)
{
return;
}
if (maxTries-- == 0)
{
Logger.Information($"There are still {sessionCount} sessions alive. Ignore and continue shutdown.");
return;
}
Logger.Information($"{ProgramName} is shutting down. Wait {SessionConnectWait} seconds, since there are stil {sessionCount} sessions alive...");
await Task.Delay(SessionConnectWait * 1000);
}
}
/// <inheritdoc />
public override void Execute(OpcSession session)
{
Logger.Information($"Start action {Description} on '{session.EndpointUrl}'");
// read the node info
Node node = session.OpcUaClientSession.ReadNode(OpcUaNodeId);
// report the node info
Logger.Information($"Node Displayname is '{node.DisplayName}'");
Logger.Information($"Node Description is '{node.Description}'");
// read the value
DataValue dataValue = session.OpcUaClientSession.ReadValue(OpcUaNodeId);
// report the node value
Logger.Information($"Node Value is '{dataValue.Value}'");
Logger.Information($"Node Value is '{dataValue.ToString()}'");
}
/// <summary>
/// Create an OPC session management data structures.
/// </summary>
private static void CreateOpcSession(Uri endpointUrl, bool useSecurity)
{
try
{
// create new session info
OpcSession opcSession = new OpcSession(endpointUrl, useSecurity, OpcSessionCreationTimeout);
// add all actions to the session
List <OpcAction> actionsOnEndpoint = new List <OpcAction>();
var endpointConfigs = _actionConfiguration.Where(c => c.EndpointUrl == endpointUrl);
foreach (var config in endpointConfigs)
{
config?.Read.ForEach(a => opcSession.OpcActions.Add(new OpcReadAction(config.EndpointUrl, a)));
config?.Test.ForEach(a => opcSession.OpcActions.Add(new OpcTestAction(config.EndpointUrl, a)));
}
}
catch (Exception e)
{
Logger.Fatal(e, "Creation of the OPC session failed.");
throw e;
}
}
/// <summary>
/// Execute function needs to be overloaded.
/// </summary>
public virtual void Execute(OpcSession session)
{
Logger.Error($"No Execute method for action ({Description}) defined.");
throw new Exception($"No Execute method for action ({ Description}) defined.");
}