I want to do the Ruby daemon program. I need to call an action which I defined in the daemon program from my Ruby application. That daemon program may also be called from another application. I installed the Ruby daemon Gem and I did the test program. Can any one please give me the step by step sample. How can I achieve this?
You might want to investigate the daemon-kit library, which provides a nice skeleton structure for various kinds of daemons. Your use case might actually be well-served by an AMQP daemon.
There's a great reference on DRb: DRb API
And I found a tutorial here, and another one by DRBrain.
I've been researching this for my own hobby project. Unfortunately, I think there's a language barrier which is preventing a more in depth question. I'm sorry your question got voted down. Maybe, if you posted it in english and your own language, in conjunction with BabelFish maybe we'd be better able to answer your question. I'm interested in SO user's take on this subject, as DRb is very important to my hobby app (alright alright, it's a game. :P)
Hope this helps.
[Edit: my own English is very sucky pre-coffee]
Related
Iām just browsing through the docs+code and I have a quick question: do you see Wolkenkit, or any of its components, working in a serverless environment? either now or in the future
Short answer
Unfortunately no.
Long answer
Unfortunately no, if we are talking about now. wolkenkit is very strict in separating your domain code from the technical infrastructure code that is required to run your domain code. Right now this technical infrastructure code is focused on making use of Docker containers, as this allows you to work not only in the cloud, but also locally, or in a classic data-center, or ā¦ you name it š
Of course it would be technically feasible and reasonable, to have another type of runtime in the future, that does not make use of Docker containers, but instead would work with some kind of FaaS solution. As the native web (the company behind wolkenkit) is a small company, we need to decide what to focus on, and unfortunately, at least right now this is not on the roadmap for the close future. I do not say that this will never be done ā it just will take time. Maybe also someone else comes up with such a runtime and enhances the wolkenkit ecosystem.
So, to cut a long story short, if now, then the answer is no. If we're talking about the future, the answer is possible, but without an ETA.
PS: I am one of the developers of wolkenkit, so please take my answer with a grain of salt.
I am attempting to determine what can possibly be the causative factor for 20+ second response times from a Rails 3 application located in EC2 using Elasticache. I have reason to believe the problem is in fact cache related, but I have no numbers to prove it. I'd like to get those numbers. For the sake of completeness, we're running the applications atop Ubuntu 12.04 .
Searching Google, I found nothing directly relevant to my situation, and no StackOverflow topics I could find were even remotely relevant to my situation. If anyone can point me to some documentation on the matter, I'd be quite appreciative. Thank you!
I've found the best tool for this to be New Relic.
http://newrelic.com/
I don't work for them and get no benefit from you trying them.
They have a free level that you can start with. If you go up to the non-free version you can literally trace all your requests through different models and into the database telling you how long the app spent in each section. It's a great tool for profiling.
Do you, by any chance have access to standard web logs including URLs and response times?
I faced a similar situation, searched the web, found nothing relevant, and eventually decided to roll my own, which I shared in this SO post:
Profiling a multi-tiered, distributed, web application (server side)
While it is far from perfect and may be too high level for some use-cases, it gave me a pretty quick and broad insight into where the application I was trying to profile is spending most of its time in, and what the slowest parts are. HTH.
The best parts of it are that:
It is 100% platform and programming language independent.
It is a 100% free software solution
I am trying to ilustrate the concept of distributed applications using Erlang. My system currently has one server and one ATM. I try to keep it as simple as possible.
For the moment my application runs locally. I am using gen_server for a client-server relationship between the banking server and the ATM. I also have a gen_fsm module to suggest different states my ATM has. In order to store any data i use the dict module (I don't want to make things more complicated using databases). To keep processes alive (the gen_server and gen_fsm) I am using a supervisor process. I've wrapped all modules as an application but for the moment it's all local. Any ideas would be highly appreciated.
I was thinking to start the same application on two different nodes and to illustrate the distributed concept to use some kind of failover/takeover mechanism but I have no ideas on what modules to use.
Is it mandatory to use target systems?(at some point i must do a hot upgrade to the application)
What's the correct order to do these things: first to upgrade and then distribute?
I would be very grateful if someone could give me some ideas on how to accomplish all those things.
I never tried it myself, but docs seem to point to:
Erlang Release Handling (11.3 Distributed Systems).
It's a really short paragraph showing the sync_nodes command, I suggest you to read the whole chapter because I noticed that often the concepts of concurrency and distribution are so persavive in Erlang that problems like yours have already been solved and included in OTP.
BTW, Erlang user guide also has a whole chapter dedicated to Distributed Applications that seems related to distributed applications config options, I think that the two should do the trick.
Hope this helps, if you need more help just ask!
Are there any applications out there that will let me encode my Ruby on Rails code so others can't read it? I plan on selling a few small applications, but I really don't want everyone knowing my code.
Thanks.
Only example I have seen in the wild is Mingle from ThoughtWorks, which runs on JRuby, which I think they must have modified in some way to run the encrypted code.
http://www.thoughtworks-studios.com/mingle-agile-project-management
I think they may have used something like this AOT compiler:
http://kenai.com/projects/jruby/pages/RailsAOT
This also looks promising:
http://www.infoq.com/news/2008/10/rubyencoder
Check out this answer for other ideas.
Can you Distribute a Ruby on Rails Application without Source?
If you want people to able to run your code (and if you don't, then why did you write it in the first place?), then their CPU needs to be able to execute your code. In order to be able to execute the code, the CPU needs to be able to understand it.
Since CPUs are dumb, and humans aren't, this means that humans can understand the code as well.
The only way you can protect your code through technical means, is if you "own" the entire execution path: you need to build your own CPU, your own computer, write your own operating system and your own Ruby interpreter. Then, and only then can you protect your code. (But note that even the tiniest mistake will render all of your protections useless. Microsoft, Apple, Sony, the Music Industry and the Movie Industry can attest to that.)
Or, you could just do nothing, which means that your code will be automatically protected by copyright law.
Thanks for all your answers! Currently I'm looking at jRuby and Ruby Encoder options but if I find neither are what I want then I think I should just sell the code and focus more on getting customers. It really doesn't make sense to spend all this time and money on an encryption that can be easily cracked anyways.
Maybe you could host the application yourself.
This way nobody will have ever access to your code and you're clients will use the application everywhere via Internet and also will pay you for the support.
In order to host rails application the easiest way you could try http://heroku.com/ or even set a small VPS with apache and mod_passenger.
No, there is no way to have executable code that can't be read. Hard to read yes, impossible to read is... impossible. Best you can do is obfuscate, of which there are many examples around the net (but I don't know of any libraries that do it for you).
I am experimenting with Ruby and Rails. I like Ruby, but not Rails. I have Java/PHP background, I have used some frameworks, but never totally liked any of them.
Anybody using Ruby to build web apps, but not any of the frameworks? (rails, merb etc). If yes, can you point me to some resources to learn it?
It might be wise to at least leverage Rack, and maybe Sinatra gets enough out of your way for you to feel comfortable. Sinatra isn't much more than a very small, simple wrapper around the rack handler afaik.
Doing Web apps in Ruby without using a framework is like cooking without heat. I question the sense of trying this.
That said, you could probably hook up Apache to call a Ruby program as a CGI. I suspect it would be dog slow, though.
Edit: Apparently you're not the only one crazy enough to attempt this, though: I found a tutorial on Simple Ruby CGI. The author claims as his rationale that "he has nothing better to do."
Your question looks quite similar to Ruby off the rails, so you probably should read the answers of that one.
I'm using ruby instead of bash and python on my ubuntu server for sysadmin tasks.
I've found Ruby a particularly clean and powerful replacement for the places I'd have previously used bash and python in sysadmin.
I personally found one thing for myself. When I prepare some interview or I am gonna build something from scratch, in most cases I need some basic features included in Rails. That usually happens when you build something not complex, but still non trivial. In 99% of cases I need ActiveRecord, ActiveSupport etc. It is easy to get those things in your Gemfile and play with them. One thing you will always repeat is basic application structure, easy console access with preloaded libs, rakes... I created minimal gem for myself to organise this process though.. :) If you read sources you'll see what I constantly do to start something new. It is not a big deal not to use any framework at all.
https://github.com/einzige/framework