Dcom, DOT NET Programming

Assignment Help:

What is DCOM?

DCOM is different from COM in that it allows for creating objects distributed around  a network, and a protocol for invoking that object's methods, & secures the access to the object. The DCOM provides a wrapper around the COM, so it is a backward compatible extension. The DCOM uses Remote Procedural Calls (RPC) using Open Software Foundation's Distributed Computing Environment.

These RPC are implemented on  TCP/IP and named pipes. The protocol which are actually  used are  registered just before to use, as opposed to being registered at the initialization time. The main  reason for this is that if a protocol is not being used, it can't  be loaded.

In order to inform an object that the client is still not dead, periodic pinging is used. Therefore, when the client has died and no ping has been received (to refresh it) before the expired  time, the server object will perform some clean up tasks (including decrementing its reference count).

As  RPC across a network are typically slow (compared to same machine processes residing ), DCOM sends multiple requests in the same call. For e.g., in COM, the program performs a QueryInterface, that is one interface at a time. In DCOM, multiple QueryInterfaces are all clustered into one call.

This clustering optimization trick is also used when creating an instance of the object and serializing it with the data.As these two operations usually occur together, the DCOM allows one method which will perform both operations in one call without waiting for an acknowledgment from the first task before performing the second one.

Similarly, when a client pings its server object, he can do it in one call.  If there are multiple clients sending pings to multiple servers, then an optimization is made where the multiple pings going to the same object are consolidated into just one ping. This is to cut down on the use of bandwidth used only for pinging.

The client has the control to set the computer that will be responsible for the lifetime of the object. this means, these objects are not created just somewhere  the system resources and access privileges allow for it.

Call security is implemented in all 4  ways: authentication (to prevent false clients from impersonating the true client), authorisation (to insure that the  client only does what it is authorized to do), data integrity (to insure that data was not tampered with it during transit) and data privacy (to insure that only designated sources can read it). The security issues are handled as they are on the operating systems. The client gives the server various access privileges to access memory or disk space.


Related Discussions:- Dcom

We''re seeking an it candidate, Project Description: We're seeking an IT...

Project Description: We're seeking an IT candidate with experience to help us optimizely,  Skills required: .NET, C# Programming, ASP, eCommerce, SQL

Develop a hotel booking wholesale system, Develop a Hotel Booking Wholesale...

Develop a Hotel Booking Wholesale System Project Description: This project is about to prepare a hotel wholesale system for B2B offering travel agents and affiliate websites

What is windows workflow foundation, What is Windows Workflow Foundation (W...

What is Windows Workflow Foundation (WF)? Windows Workflow Foundation (WF) is a technology that was first introduced in .NET Framework 3.0. WF having of a programming model, a

Arithmetic operations, write a program in C# to perform arithmetic operatio...

write a program in C# to perform arithmetic operation

What is the dtd, What is the DTD? The DTD is Document Type Definition ...

What is the DTD? The DTD is Document Type Definition that explains the formation of the content of an XML document. The DTD manages the data to keep in a consistent format. It

Define common type system, What is Common Type System (CTS)? CTS is the...

What is Common Type System (CTS)? CTS is the component of CLR by which .NET Framework provides support for multiple languages because it have a type system that is common acros

Indexes, What are indexes? The Indexes in the SQL Server are similar to...

What are indexes? The Indexes in the SQL Server are similar to the indexes in books. They help SQL Server to retrieve the data quickly.These are classified into clustered and n

Why project needed xml?, Explain why your project needed XML. Remember ...

Explain why your project needed XML. Remember XML was meant to exchange data between the two entities as you can define your user friendly tags with ease. In the real world sce

Construct a .net wrapper for a c++, Construct a .NET wrapper for a C++ Dll ...

Construct a .NET wrapper for a C++ Dll - repost Project Description: We have a classic VC++ Dll (source code of DLL not required) that requires a .NET wrapper built by you. U

Xml validating reader class, What does Xml Validating Reader class do? ...

What does Xml Validating Reader class do? The XmlTextReader class does not validate the contents of an XML source against a schema. The correctness of the XML documents can be

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd