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I am trying to implement a client side software (a messenger) in java that uses XMPP and supports videoconferencing. For this goal I've downloaded smack and tried to work with it, so I need an xmpp java server that is open source and supports videoconferencing. Then I could connect my database to this server and use it.
Is there any server as I need?
You want XMPP with MultiMedia Jingle. But the Jingle implementation in smack is pretty old, you have to find out if it works for you. Also I think that Jingle currently only supports one-to-one video-chat, there is a multiparty Jingle XEP but it's deferred. The good news is that it's relatively server independent, all logic and negotiation is done on the client side.
If you are looking for a Java XMPP Server, give Openfire a try. Openfire is also open-source. But you don't need an Java XMPP Server just because Smack is written in java. There are many alternatives.
You are basically asking for some sophisticated solution for free/as open-source. But AFAIK no one has taken the effort to built something like that (yet). If you have the manpower, time and knowledge, you are sure welcome to contribute to the community. :)
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I am writing a database application in C linux. Currently I work on mysql but later we might migrate to postgres. Therefore my boss has asked my to prepare the application to be able to use either of the databases(mysql or postgres).
Is there a free api which I can use for this purpose? Or any suggestion on how best I can do this?
The official answer to that is ODBC.
If you don't like that (and let's face it, no one really does), Qt has a database access module, QtSql. Obviously, this will require you to make heavy use of Qt in your application.
If you can find drivers for your platform, ODBC was supposedly meant to provide exactly this: a platform-independent way to talk to databases.
(I say supposedly because in my experience, ODBC is such a mess that hooking up to an ODBC driver once turned out to be more difficult than just writing the code three times for three different databases.)
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I have searched the internet for drivers to connect to either database and all the projects I have seen have either been dead for a long time, look incomplete, or don't have good enough documentation to be usable without reading all the source.
Has anyone used Erlang to talk to either MySQL or PostgreSQL before and what sort of package did you use to do this?
Will Glozer wrote a nice native PostgreSQL client:
http://github.com/wg/epgsql
Yariv's mysql driver seems to be the best available: http://code.google.com/p/erlang-mysql-driver/
http://yarivsblog.com/articles/2006/09/13/erlang-mysql-driver-reloaded/
I haven't personally used it as my erlang projects mostly talk to redis, but my quick scan of the source didn't reveal anything too terrifying.
Maturity is a relative thing, especially for more esoteric languages like erlang.
Erlang pgsql - The pgsql-driver is a 100% erlang implementation of the Postgres Frontend/Backend protocol.
Plain straight ODBC ? Quite simple to set it up, but a pain to make it work..
http://github.com/inaka/sumo_db_mysql or http://github.com/inaka/sumo_db_pgsql Both of them are stable, actively maintained and used in production systems
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I'd like to learn how to implement basic "comet" or client push methods
something like meebo
from server and client side , where can I find good and clear spec?
Thanks
Although you're not really specifying the technology you would like to work in ... But these links proved to be very helpful for me:
Ajax Push(like) Chat with Comet
Creating Comet applications with ASP.Net
COMET (or Reverse AJAX) based Grid Control for ASP.NET
Comet is a big term, and there are many different implementations. There isn't a particular single specifications, it is more of a concept or idea.
I had to do a project with server push, and I came across a couple of attempts to come up with specifications, such as BOSH.
Eventually, I found the best I could do was check out what others are currently doing, there are a couple of nice projects such as Orbited and Juggernaut. Then, implement my own solution.
I built my own solution using Twisted and SocketBridge.
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I am in the process of trying to graphically represent all of our server racks. So when we receive a new server we can decide where this should be put and where a specific servers currently resides.
Are there any existing software packages that stores this kind of data already? I'd prefer open source ones if there are any but anything would be helpful.
If you use nagios as monitoring application you could use NagVis to create custom status maps e.g. a rackview of your servers.
Example Screenshot
RackMonkey seems to fit your requirements too.
I had a look around at this and the solutions suggested (thanks Node) and at the moment my feeling are using one of the following:
NVentory though I'm not sure my company will want to use ruby and rails as this would be our first product using this
Rackview
Or more likely just MS Office Visio 2007 Add-in for Rack Server Virtualization however this looks like it only links to excel and hopefully I can use excel to query a database.
I will update when I have played about with these tools and see what they can provide.
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We want to implement chat on our website so that users can communicate with each other.
Our general requirements are:
It should be rendered on our web pages, but it could be rendered in an IFrame or something like that. The users of our website are part of the general public, not internal teams, so we don't want them to have to install a separate app.
Users should be able to use their existing account with our website and not have to create a new account for the chat tool. If we partner with someone, like Meebo, we don't want to have to share a significant amount of our user information for partner.
Code under an public license, but preferably not an open-source project using the GPL license, but BSD or MIT license (and probably others) is okay. An inexpensive product with a non-public license may be okay as well.
We want to get this implemented pretty quickly, and we don't really want to build our own solution.
Has anyone worked with or familiar with a solution that would satisfy some or all of these these requirements? Any other ideas/suggestions?
Thanks.
There are quite a few. As for open source try
https://blueimp.net/ajax/
If you need a heavy duty chat server with web based extension look at
http://www.igniterealtime.org
We currently used this internally in a Windows enviornment. We had some issues getting it to work with Active Directory so we went for the mySQL installation.
Why not shell out a few bucks for (sometimes it's cheaper NOT to re-invent the wheel)
http://www.aspnetajaxchat.com
Hope that helps