You can specify cross-concern message filter code to be executed for every message sent or received from the server. The implementation of the filter is in C# in the OrchExtensions.cs file.
The following properties are available for using the message filter in Orchestration:
ServerReceiveMessageFilter is the message filter applied to all the messages received from the server application.
ServerSendMessageFilter is the message filter applied to all the messages before sending them to the server application.
To use the message filter in the Orchestration, you must set either of the ServerReceiveMessageFilter or ServerSendMessageFilter property of the Orchestration root node.
Message Filters are defined by dragging a MesasgeFilter activity to the orchestration. The Message Filter activity property FilterName identifies the Message Filter.
To define the message filter in orchestration:
Drag the MessageFilter activity from the Toolbox to the Start or End activity.
In the Properties window, click MessageFilterName.
Specify the process name defined in the OrchExtensions.cs file to be used for a message filter.
Implementing a Message Filter
Unisys.Message class is passed to the message filter process as an argument. Unisys.Message has the field MessageClassName which identifies the message type. Reflection must be used to access specific fields.
For example, you can use the following code to check and change the value of "MyField" in the message:
Type messageType = message.GetType();
System.Reflection.PropertyInfo pi = messageType.GetProperty("MyField");
if (pi != null)
{
string val = (string)pi.GetValue(message);
if (val.Equals("hello"))
pi.SetValue(message, "goodbye");
}
For more information on the following, refer to Using the OrchExtensions Class:
Accessing session declarations defined in the orchestration
Interacting with the data source connector
Interacting with the client
Accessing orch.Message