/
MethodsNodeManager.cs
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/
MethodsNodeManager.cs
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/* ========================================================================
* Copyright (c) 2005-2019 The OPC Foundation, Inc. All rights reserved.
*
* OPC Foundation MIT License 1.00
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* The complete license agreement can be found here:
* http://opcfoundation.org/License/MIT/1.00/
* ======================================================================*/
using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Xml;
using System.IO;
using System.Threading;
using System.Reflection;
using Opc.Ua;
using Opc.Ua.Server;
namespace Quickstarts.MethodsServer
{
/// <summary>
/// A node manager for a server that exposes several variables.
/// </summary>
public class MethodsNodeManager :CustomNodeManager2
{
#region Constructors
/// <summary>
/// Initializes the node manager.
/// </summary>
public MethodsNodeManager(IServerInternal server, ApplicationConfiguration configuration)
:
base(server, configuration, Namespaces.Methods)
{
SystemContext.NodeIdFactory = this;
// get the configuration for the node manager.
m_configuration = configuration.ParseExtension<MethodsServerConfiguration>();
// use suitable defaults if no configuration exists.
if (m_configuration == null)
{
m_configuration = new MethodsServerConfiguration();
}
}
#endregion
#region IDisposable Members
/// <summary>
/// An overrideable version of the Dispose.
/// </summary>
protected override void Dispose(bool disposing)
{
if (disposing)
{
// TBD
}
}
#endregion
#region INodeIdFactory Members
/// <summary>
/// Creates the NodeId for the specified node.
/// </summary>
public override NodeId New(ISystemContext context, NodeState node)
{
return node.NodeId;
}
#endregion
#region INodeManager Members
/// <summary>
/// Does any initialization required before the address space can be used.
/// </summary>
/// <remarks>
/// The externalReferences is an out parameter that allows the node manager to link to nodes
/// in other node managers. For example, the 'Objects' node is managed by the CoreNodeManager and
/// should have a reference to the root folder node(s) exposed by this node manager.
/// </remarks>
public override void CreateAddressSpace(IDictionary<NodeId, IList<IReference>> externalReferences)
{
lock (Lock)
{
// create a object to represent the process being controlled.
BaseObjectState process = new BaseObjectState(null);
process.NodeId = new NodeId(1, NamespaceIndex);
process.BrowseName = new QualifiedName("My Process", NamespaceIndex);
process.DisplayName = process.BrowseName.Name;
process.TypeDefinitionId = ObjectTypeIds.BaseObjectType;
// ensure the process object can be found via the server object.
IList<IReference> references = null;
if (!externalReferences.TryGetValue(ObjectIds.ObjectsFolder, out references))
{
externalReferences[ObjectIds.ObjectsFolder] = references = new List<IReference>();
}
process.AddReference(ReferenceTypeIds.Organizes, true, ObjectIds.ObjectsFolder);
references.Add(new NodeStateReference(ReferenceTypeIds.Organizes, false, process.NodeId));
// a property to report the process state.
PropertyState<uint> state = m_stateNode = new PropertyState<uint>(process);
state.NodeId = new NodeId(2, NamespaceIndex);
state.BrowseName = new QualifiedName("State", NamespaceIndex);
state.DisplayName = state.BrowseName.Name;
state.TypeDefinitionId = VariableTypeIds.PropertyType;
state.ReferenceTypeId = ReferenceTypeIds.HasProperty;
state.DataType = DataTypeIds.UInt32;
state.ValueRank = ValueRanks.Scalar;
process.AddChild(state);
// a method to start the process.
MethodState start = new MethodState(process);
start.NodeId = new NodeId(3, NamespaceIndex);
start.BrowseName = new QualifiedName("Start", NamespaceIndex);
start.DisplayName = start.BrowseName.Name;
start.ReferenceTypeId = ReferenceTypeIds.HasComponent;
start.UserExecutable = true;
start.Executable = true;
// add input arguments.
start.InputArguments = new PropertyState<Argument[]>(start);
start.InputArguments.NodeId = new NodeId(4, NamespaceIndex);
start.InputArguments.BrowseName = BrowseNames.InputArguments;
start.InputArguments.DisplayName = start.InputArguments.BrowseName.Name;
start.InputArguments.TypeDefinitionId = VariableTypeIds.PropertyType;
start.InputArguments.ReferenceTypeId = ReferenceTypeIds.HasProperty;
start.InputArguments.DataType = DataTypeIds.Argument;
start.InputArguments.ValueRank = ValueRanks.OneDimension;
Argument[] args = new Argument[2];
args[0] = new Argument();
args[0].Name = "Initial State";
args[0].Description = "The initialize state for the process.";
args[0].DataType = DataTypeIds.UInt32;
args[0].ValueRank = ValueRanks.Scalar;
args[1] = new Argument();
args[1].Name = "Final State";
args[1].Description = "The final state for the process.";
args[1].DataType = DataTypeIds.UInt32;
args[1].ValueRank = ValueRanks.Scalar;
start.InputArguments.Value = args;
// add output arguments.
start.OutputArguments = new PropertyState<Argument[]>(start);
start.OutputArguments.NodeId = new NodeId(5, NamespaceIndex);
start.OutputArguments.BrowseName = BrowseNames.OutputArguments;
start.OutputArguments.DisplayName = start.OutputArguments.BrowseName.Name;
start.OutputArguments.TypeDefinitionId = VariableTypeIds.PropertyType;
start.OutputArguments.ReferenceTypeId = ReferenceTypeIds.HasProperty;
start.OutputArguments.DataType = DataTypeIds.Argument;
start.OutputArguments.ValueRank = ValueRanks.OneDimension;
args = new Argument[2];
args[0] = new Argument();
args[0].Name = "Revised Initial State";
args[0].Description = "The revised initialize state for the process.";
args[0].DataType = DataTypeIds.UInt32;
args[0].ValueRank = ValueRanks.Scalar;
args[1] = new Argument();
args[1].Name = "Revised Final State";
args[1].Description = "The revised final state for the process.";
args[1].DataType = DataTypeIds.UInt32;
args[1].ValueRank = ValueRanks.Scalar;
start.OutputArguments.Value = args;
process.AddChild(start);
// save in dictionary.
AddPredefinedNode(SystemContext, process);
// set up method handlers.
start.OnCallMethod = new GenericMethodCalledEventHandler(OnStart);
}
}
private object m_processLock = new object();
private uint m_state;
private uint m_finalState;
private Timer m_processTimer;
private PropertyState<uint> m_stateNode;
/// <summary>
/// Called when the Start method is called.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="method">The method.</param>
/// <param name="inputArguments">The input arguments.</param>
/// <param name="outputArguments">The output arguments.</param>
/// <returns></returns>
public ServiceResult OnStart(
ISystemContext context,
MethodState method,
IList<object> inputArguments,
IList<object> outputArguments)
{
// all arguments must be provided.
if (inputArguments.Count < 2)
{
return StatusCodes.BadArgumentsMissing;
}
// check the data type of the input arguments.
uint? initialState = inputArguments[0] as uint?;
uint? finalState = inputArguments[1] as uint?;
if (initialState == null || finalState == null)
{
return StatusCodes.BadTypeMismatch;
}
lock (m_processLock)
{
// check if the process is running.
if (m_processTimer != null)
{
m_processTimer.Dispose();
m_processTimer = null;
}
// start the process.
m_state = initialState.Value;
m_finalState = finalState.Value;
m_processTimer = new Timer(OnUpdateProcess, null, 1000, 1000);
// the calling function sets default values for all output arguments.
// only need to update them here.
outputArguments[0] = m_state;
outputArguments[1] = m_finalState;
}
// signal update to state node.
lock (Lock)
{
m_stateNode.Value = m_state;
m_stateNode.ClearChangeMasks(SystemContext, true);
}
return ServiceResult.Good;
}
/// <summary>
/// Called when updating the process.
/// </summary>
/// <param name="state">The state.</param>
private void OnUpdateProcess(object state)
{
try
{
lock (m_processLock)
{
// check if increasing.
if (m_state < m_finalState)
{
m_state++;
}
// check if decreasing.
else if (m_state > m_finalState)
{
m_state--;
}
// check if all done.
else
{
m_processTimer.Dispose();
m_processTimer = null;
};
}
// signal update to state node.
lock (Lock)
{
m_stateNode.Value = m_state;
m_stateNode.ClearChangeMasks(SystemContext, true);
}
}
catch (Exception e)
{
Utils.Trace(e, "Unexpected error updating process.");
}
}
/// <summary>
/// Frees any resources allocated for the address space.
/// </summary>
public override void DeleteAddressSpace()
{
lock (Lock)
{
// TBD
}
}
/// <summary>
/// Returns a unique handle for the node.
/// </summary>
protected override NodeHandle GetManagerHandle(ServerSystemContext context, NodeId nodeId, IDictionary<NodeId, NodeState> cache)
{
lock (Lock)
{
// quickly exclude nodes that are not in the namespace.
if (!IsNodeIdInNamespace(nodeId))
{
return null;
}
NodeState node = null;
if (!PredefinedNodes.TryGetValue(nodeId, out node))
{
return null;
}
NodeHandle handle = new NodeHandle();
handle.NodeId = nodeId;
handle.Node = node;
handle.Validated = true;
return handle;
}
}
/// <summary>
/// Verifies that the specified node exists.
/// </summary>
protected override NodeState ValidateNode(
ServerSystemContext context,
NodeHandle handle,
IDictionary<NodeId, NodeState> cache)
{
// not valid if no root.
if (handle == null)
{
return null;
}
// check if previously validated.
if (handle.Validated)
{
return handle.Node;
}
// TBD
return null;
}
#endregion
#region Overridden Methods
#endregion
#region Private Fields
private MethodsServerConfiguration m_configuration;
#endregion
}
}