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Chapter 10 – Remoting

Chapter 10 – Remoting. Objectives. Application Domains Remote Object Types Marshaling-by-Reference Modes The .NET Remoting Architecture. Application Domains. All .NET components require a managed environment to run in OS’s provide processes only

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Chapter 10 – Remoting

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  1. Chapter 10 – Remoting CIS 330 - .NET Applications

  2. Objectives • Application Domains • Remote Object Types • Marshaling-by-Reference Modes • The .NET Remoting Architecture CIS 330 - .NET Applications

  3. Application Domains • All .NET components require a managed environment to run in • OS’s provide processes only • Application Domain: bridge between managed code and unmanged code (OS processes) Process A Process B App Domain A App Domain B App Domain C Assembly 1 Assembly 1 Assembly 1 Assembly 2 Assembly 4 Assembly 4 Assembly 3 Assembly 5 Assembly 6 CIS 330 - .NET Applications

  4. Application Domains (cont) • App domain – logical processes • Why App Domains? • Fault Isolation • Security • Benefits • Lower overhead • Can start and shut down independent of hosting processes • Cross-app domain calls in same process are faster then cross-process calls CIS 330 - .NET Applications

  5. Proxy Proxy Client Object Client Proxy Client Client Application Domains (cont) • All cross-app domains use remoting Machine 2 Machine 1 Process C Process A Process B App Domain 4 App Domain 1 App Domain 3 App Domain 2 Marshalling: forwarding a call to an object CIS 330 - .NET Applications

  6. Application Domains (cont) • .NET has AppDomain class • CurrentDomain static property • Default App Domain: created when exe is launched • Can create objects in app domain • CreateInstanceAndUnwrap(…) • Can create new App Domain • CreateDomain(string friendlyName) • Can create proxy on client side • CreateInstance() & Unwrap() CIS 330 - .NET Applications

  7. Remote Object Types • Marshaling by Value • Copy of object is transferred to calling app domain • Objects must be serializable • Used when client makes frequent short calls • Marshaling by Reference • Remote object accessed via proxy • Class must be derived from MarshalByRefObject • Two kinds: client-activated and server-activated CIS 330 - .NET Applications

  8. Client Object Proxy Formatter Channel Channel Formatter .NET Remoting Architecture Client App Domain • Formatter: SOAP or binary • Channel: TCP, HTTP, or IPC • Both client and host must do channel registration MethodCall() Message MethodCall() Message Stack Builder Host App Domain CIS 330 - .NET Applications

  9. Summary • Application Domains • Remote Object Types • Marshaling-by-Reference Modes • The .NET Remoting Architecture CIS 330 - .NET Applications

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