ghedas - Developer IT

network layer reliability

- by ghedas

I have a question about the reliability of network layers, I think in the network layers there is a redundancy, my question is why both link-level and end-end reliability need?

what are the difficulties of operating system multithreading?

I am reading a book that compares two ways of implementing threads, Middleware Threads and OS Threads. I have a question about these sentences: "A difficulty of operating system multithreading, however, is performance overhead. Since it is the operating system that is involved in switching threads, this involves system calls. These are generally more expensive than thread operations executed at the user level, which is where the transactional middleware is operating."

Read the article

Error after installing scala plugin of netbeans

- by ghedas

I installed the scala plugin on my netbeans and followed the instruction of this page: http://wiki.netbeans.org/Scala68v1#Scala_Plugins_for_NetBeans_6.8_v1.x_.28RC2.29 but after it completed correctly step by step, when I make an empty project (Hello world!), the project has an error! The empty project is here: package scalaapplication1 object Main { /** * @param args the command line arguments */ def main(args: Array[String]): Unit = { println("Hello, world!") } } and the console error report is: ...\NetBeansProjects\ScalaApplication2\nbproject\build-impl.xml:403: The following error occurred while executing this line: ...\NetBeansProjects\ScalaApplication2\nbproject\build-impl.xml:236: scalac doesn't support the "fork" attribute Is there any suggestion about it?!

Read the article

Thread pool in scala

- by ghedas

I have a project that is actor-based and for one part of it I must use some actors that receive message after that one actor assigns to each request separately and each actor is responsible for doing its message request, so I need something like a thread pool for actors of my project, are there any features in Scala that is useful for my necessity? how can I achieve this goal? tanks a lot for your attention!

Read the article

how can I make pdf with flash files?

- by ghedas

I have many .swf files and want to make a .pdf file with them, how can I do it automatically with a script file?

Read the article

how can I design a good architechture for a Transaction Processing System?

- by ghedas

I have a project that must design an architecture for it. This project is a something like a Transaction Processing system and I need to know something like this: when and where I must use synchronous and asynchronous relations between its components? If always I use synchronous relations, the amount of messages maybe become exceeded and makes problem for TP system, and on the other hand synchronous relations make lots of delay, I think a mixture of them is required! If other parameters required to considering please help me! the most nonfunctional requirements of this project are performance and availability of it. I need useful materials and suggestions for it.

Read the article

how can I make a pdf file with flash files?

- by ghedas

I have many .swf files and want to make a .pdf file with them, how can I do it automatically with a script file? Each .swf is only a slide and there are no animation in them!

Read the article

What's the benefits of SOA over OO?

- by ghedas

I want to know the differences between SOA and OO, and why SOA is going to popular?

Developer IT