Net Remoting

• SOAP (System.Runtime.Serialization.Formatters.Soap)
▫ Use XML encoding where interoperability with other remoting frameworks is essential.
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Remote Objects
• It is an object outside the application domain of the caller application. • Any object can be changed into a remote object by deriving it from MarshalByRefObject, or by making it serializable either by adding the [Serializable]tag or by implementing the ISerializable interface.
• Marshalling objects by reference
▫ analogous to having a pointer to the object. ▫ Marshal by reference classes must inherit from System.MarshalByRefObject.
public MyRemotableObject() { } public void SetMessage(string message) { Cache.GetInstance().MessageString = message; }
}
}
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Create a Server to Expose the Remotable Object
.Net Remoting
Pooja Panjala 06/17/10
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Agenda
• • • • • What is .net Remoting? Explanation of terms Architecture Implementation of Remoting Sample example
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Proxy object
• A proxy object is an object that acts in place of some other object. • Created when client activates a remote object. • It is an instance of the TransparentProxy class, directly available to the client to communicate with the remote object.
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Two methods
• Marshalling objects by value
▫ analogous to having a copy of the server object at the client. ▫ Marshal by value classes must either be marked with the [Serilaizable] attribute in order to use the default serialization, or must implement the ISerializable interface.
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Create a Client to Use the Remotable Object
namespace RemotableObjects { public class frmRCleint : System.Windows.Forms.Form { private System.Windows.Forms.TextBox textBox1; MyRemotableObject remoteObject; private ponentModel.Container components = null; public frmRCleint() { InitializeComponent(); // using TCP protocol // running both client and server on same machines TcpChannel chan = new TcpChannel(); ChannelServices.RegisterChannel(chan); // Create an instance of the remote object remoteObject = (MyRemotableObject) Activator.GetObject( typeof(MyRemotableObject),"tcp://localhost:8080/ HelloWorld"); } private void textBox1_TextChanged(object sender, System.EventArgs e) { remoteObject.SetMessage(textBox1.Text); } } }
namespace RemotableObjects { public class frmRServer : System.Windows.Forms.Form, IObserver { private System.Windows.Forms.TextBox textBox1; private MyRemotableObject remotableObject; private ponentModel.Container components = null; public frmRServer() { InitializeComponent(); remotableObject = new MyRemotableObject(); // using TCP protocol TcpChannel channel = new TcpChannel(8080); ChannelServices.RegisterChannel(channel); RemotingConfiguration.RegisterWellKnownServiceType( typeof(MyRemotableObject),"HelloWorld", WellKnownObjectMode.Singleton); RemotableObjects.Cache.Attach(this); } } }
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Serialization formatters
• .NET Remoting uses serialization to copy marshal-by-value objects, and to send reference of objects which are marshal-by-reference, between application domains. • Formatters are used for encoding and decoding the messages before they are transported by the channel.
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Channels
• It is a mechanism by which a stream of bytes is sent from one point to the other. • Two pre-defined .NET Remoting channels existing in System.Runtime.Remoting.Channels are TCPChannel and the HTTPChannel.
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What is Remoting in .Net?
• It is a mechanism for communicating between objects which are not in the same process. • Enables different applications located on same computer or different computer to communicate with objects. • Provides a framework that allows objects to interact with each other across application domains.
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Types of .NET Remotable Objects
Single Call object: Service one and only one request coming in. Singleton Call object : Service multiple clients and is useful when data needs to be shared explicitly between several clients. Client-Activated object : Richer than singleton in many aspects as they can store the state information between method calls for its specific client.
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Remoting Components
• A remotable object: Which is an object that contain some properties and methods located in one application domain and you need to call its methods or properties from another application domain or process. • A host application: This is the host of the remotable object also called as the server application. The main task of this host is to listen to requests for the hosted remotable object. • A client application: This is the application which makes requests for the remotable object.