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Creating a Channel

In the WCF channel model, you invoke operations on the SAP system or receive messages from the SAP system by exchanging SOAP messages with the Microsoft BizTalk Adapter 3.0 for mySAP Business Suite over a WCF channel.

  • You invoke operations (outbound operations) by using either an IRequestChannel or an IOutputChannel to send messages to the adapter

  • You receive messages (triggered from the SAP system) over an IReplyChannel.

The topics in this section provide information about how to create and configure channel shapes that are used for inbound and outbound operations.

You can use either an IRequestChannel or an IOutputChannel to invoke operations on the SAP system. In either case, you first create a System.ServiceModel.ChannelFactory using the appropriate interface. You then use the factory to create the channel. After you have created the channel you can use it to invoke operations on the adapter.

To create and open an outbound channel
  1. Create and initialize an instance of ChannelFactory for the desired channel shape by using an endpoint and a binding. The endpoint specifies an SAP connection URI and the binding is an instance of SAPDBBinding. (Set any binding properties required before you open the channel factory.)

  2. Provide SAP credentials for the channel factory by using the ClientCredentials property.

  3. Open the channel factory.

  4. Get an instance of the channel by invoking the CreateChannel method on the channel factory.

  5. Open the channel.

You can specify the binding and endpoint address in your code or from configuration.

Specifying the Binding and Endpoint Address in Code

The following code example shows how to create an IRequestChannel by specifying the binding and endpoint address in code. The code to create an IOutputChannel is the same except that you must specify an IOutputChannel interface for the ChannelFactory and channel type.

// Create binding -- set binding properties before you open the factory.
SAPBinding sapBinding = new SAPBinding();

// Create address.
EndpointAddress sapAddress = new EndpointAddress("sap://Client=800;lang=EN@A/YourSAPHost/00");

// Create channel factory from binding and address.
ChannelFactory<IRequestChannel> factory = 
    new ChannelFactory<IRequestChannel>(sapBinding, sapAddress);

// Specify credentials. 
factory.Credentials.UserName.UserName = "YourUserName";
factory.Credentials.UserName.Password = "YourPassword";

// Open the factory
factory.Open();

// Get channel and open it.
IRequestChannel channel = factory.CreateChannel();
channel.Open();

Specifying the Binding and Endpoint Address in Configuration

The following code example shows how to create a channel factory from a client endpoint specified in configuration.

// Create channel factory from configuration.
ChannelFactory<IRequestChannel> factory =
new ChannelFactory<IRequestChannel>("MyRequestChannel");

// Specify credentials.
factory.Credentials.UserName.UserName = "YourUserName";
factory.Credentials.UserName.Password = "YourPassword";

// Open the factory.
factory.Open();

// Get a channel and open it.
IRequestChannel channel = factory.CreateChannel();
channel.Open();

The Configuration Settings

The following code shows the configuration settings used for the preceding example. The contract for the client endpoint must be "System.ServiceModel.Channels.IRequestChannel" or "System.ServiceModel.Channels.IRequestChannel" depending on the kind of channel shape that you want to create.

<?xml version="1.0" encoding="utf-8"?>
<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
    <system.serviceModel>
        <bindings>
            <sapBinding>
                <binding name="SAPBinding" closeTimeout="00:01:00" openTimeout="00:01:00"
                    receiveTimeout="00:10:00" sendTimeout="00:01:00" enableBizTalkCompatibilityMode="false"
                    receiveIdocFormat="Typed" enableSafeTyping="false" generateFlatFileCompatibleIdocSchema="true"
                    maxConnectionsPerSystem="50" enableConnectionPooling="true"
                    idleConnectionTimeout="00:15:00" flatFileSegmentIndicator="SegmentDefinition"
                    enablePerformanceCounters="false" autoConfirmSentIdocs="false"
                    enableBusinessObjects="false" acceptCredentialsInUri="false"
                    padReceivedIdocWithSpaces="false" sncLibrary="" sncPartnerName="" />
            </sapBinding>
        </bindings>
        <client>
            <endpoint address="sap://CLIENT=800;LANG=EN;@a/ADAPSAP47/00?RfcSdkTrace=False&amp;AbapDebug=False"
                binding="sapBinding" bindingConfiguration="SAPBinding" contract="System.ServiceModel.Channels.IRequestChannel"
                name="MyRequestChannel" />
        </client>
    </system.serviceModel>
</configuration>

Creating Inbound (Service) Channels

You configure the adapter to receive inbound messages from an SAP system by setting binding properties on an instance of SAPBinding. You then use this binding to build a channel listener from which you can get an IReplyChannel channel to receive operations from the adapter.

To create and open an IReplyChannel to Receive Data-changed Notifications
  1. Create an instance of SAPBinding.

  2. Set any binding properties required for the operations you want to receive. Be sure to set the AcceptCredentialsInUri binding property.

  3. Create a BindingParameterCollection and add an InboundActionCollection that contains the actions of the operations that you want to receive. The adapter will return an exception to the SAP system for all other operations. This step is optional. For more information, see Receiving Inbound Operations from the SAP System by Using the WCF Channel Model.

  4. Create a channel listener by invoking BuildChannelListener<IReplyChannel> method on the SAPBinding. You specify the SAP connection URI as one of the parameters to this method. The connection URI must contain parameters for an RFC Destination on the SAP system. For more information about the SAP connection URI, see The The SAP System Connection URI. If you created a BindingParameterCollection in step 3, you also specify this when you create the channel listener.

  5. Open the listener.

  6. Get an IReplyChannel channel by invoking the AcceptChannel method on listener.

  7. Open the channel.

The following code shows how to create a channel listener and get an IReplyChannel to receive operations from the adapter.

// Create a binding and specify any binding properties required
// for the opreations you want to receive
SAPBinding binding = new SAPBinding();

// Set AcceptCredentialsInUri because the URI must contain credentials.
binding.AcceptCredentialsInUri = true;

// Create an InboundActionCollection and add the message actions to listen for,
// only the actions added to the InboundActionCollection are received on the channel.
// In this case a single action is specified: http://Microsoft.LobServices.Sap/2007/03/Rfc/Z_RFC_MKD_ADD
InboundActionCollection actions = new InboundActionCollection(listeneraddress);
actions.Add("http://Microsoft.LobServices.Sap/2007/03/Rfc/Z_RFC_MKD_ADD");

// Create a BindingParameterCollection and add the InboundActionCollection
BindingParameterCollection bpcol = new BindingParameterCollection();
bpcol.Add(actions);

// Create the channel listener by specifying
// the binding parameter collection (to filter for the Z_RFC_MKD_ADD action) and 
// a connection URI that contains listener parameters.
Uri listeneraddress =
new Uri("sap://User=YourUserName;Passwd=YourPassword;Client=800;Lang=EN;@a/YourSAPHost/00?ListenerGwServ=SAPGATEWAY&ListenerGwHost=YourSAPHost&ListenerProgramId=SAPAdapter");
listener = binding.BuildChannelListener<IReplyChannel>(connectionUri, new BindingParameterCollection());
listener.Open();

// Get a channel from the listener and open it.
channel = listener.AcceptChannel();
channel.Open();

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