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dotnet general : Web Services Shared Resource/Memory
How can I share resources across all users of a web service for read/write access. *Situation* *one*: I want to have an in memory counter that all users of the webservice could access. Call it g_count. Then I create a web method called Update_g_count. public int g_count( int incr ) { g_count += incr; return g_count; } So, how do I define g_count so it's global across all users? *Situation* *two*: I have an XML file that I want to load into an XmlDocument. I want to set up a Web Method that uses XPath to find a node, and then change the value of the InnerText. How do I put this XmlDocument into memory so all users can update it without collisions when they try to update the nodes? Do I need to use a mutex ? How can this mutex apply across all users of the web service ? Do I put it in global.asax ? -- incognito
Hi,
You can use the Application object to store the object accross web services. public int g_count() { ...... // Get the count int gcount = (int) Context.Application["gcount"]; ...// Process it //Save it back Context.Application["gcount"] = gcount ; } Although its not a recomended way to share such resources in read/write mode when specially in the case of web applications. You can using the lock C# keyword to lock access to the object while you are modifying it. -- Regards, Saurabh Nandu AksTech Solutions, reflecting your needs... [ www.AksTech.com ] [ www.MasterCSharp.com ] [quoted text, click to view] "Grandpa Pete" wrote:
> > How can I share resources across all users of a web service for read/write > access. > > *Situation* *one*: > > I want to have an in memory counter that all users of the webservice could > access. Call it g_count. > > Then I create a web method called Update_g_count. > > public int g_count( int incr ) > { > g_count += incr; > return g_count; > } > > So, how do I define g_count so it's global across all users? > > *Situation* *two*: > > I have an XML file that I want to load into an XmlDocument. > > I want to set up a Web Method that uses XPath to find a node, and then > change the value of the InnerText. > > How do I put this XmlDocument into memory so all users can update it without > collisions when they try to update the nodes? > > Do I need to use a mutex ? > > How can this mutex apply across all users of the web service ? > > Do I put it in global.asax ? > > > > -- > incognito > http://kentpsychedelic.blogspot.com/
You say that this is not a 'recommended' way to share resources in web applications. Can you suggest a recommended way? Specifically, I want to share access to an XmlDocument across all users of my web service. I want them to be able to query and update nodes on the document. [quoted text, click to view] Saurabh Nandu wrote: > Hi, > > You can use the Application object to store the object accross web > services. > > public int g_count() > { > ..... > // Get the count > int gcount = (int) Context.Application["gcount"]; > > ..// Process it > > //Save it back > Context.Application["gcount"] = gcount ; > > } > > > Although its not a recomended way to share such resources in read/write > mode when specially in the case of web applications. > > You can using the lock C# keyword to lock access to the object while you > are modifying it. > -- incognito @ http://kentpsychedelic.blogspot.com/ Man is the best computer we can put aboard a spacecraft ... and the only one
hi,
XML is best when its used as a data exchange document, and not as a database as such. The reason i don't recomend using it as a database (shared amongst users) is that you end up writing a lot of locking code to ensure that when one user is updating the document others cannot write to it and things like that. Now suppose 2 users tried to update at the same time, ones request will pass through other will fail since the document gets locked. FOr multiple read/write the best source to store data is a database!! Its meant to help you d multiple read/writes without locking the users. -- Regards, Saurabh Nandu AksTech Solutions, reflecting your needs... [ www.AksTech.com ] [ www.MasterCSharp.com ] [quoted text, click to view] "Donnie Darko" wrote:
> > You say that this is not a 'recommended' way to share resources in web > applications. > > Can you suggest a recommended way? > > Specifically, I want to share access to an XmlDocument across all users of > my web service. I want them to be able to query and update nodes on the > document. > > > Saurabh Nandu wrote: > > > Hi, > > > > You can use the Application object to store the object accross web > > services. > > > > public int g_count() > > { > > ..... > > // Get the count > > int gcount = (int) Context.Application["gcount"]; > > > > ..// Process it > > > > //Save it back > > Context.Application["gcount"] = gcount ; > > > > } > > > > > > Although its not a recomended way to share such resources in read/write > > mode when specially in the case of web applications. > > > > You can using the lock C# keyword to lock access to the object while you > > are modifying it. > > > > -- > incognito @ http://kentpsychedelic.blogspot.com/ > > Man is the best computer we can put aboard a spacecraft ... and the only one > that can be mass produced with unskilled labor. -- Werner von Braun
[quoted text, click to view]
Saurabh Nandu wrote: Actually, I already created a Windows service that allows multithreaded access to an XmlDocument for simulaneous 'users' to read/write. I use the Mutex class. I mutex is like queueing system, it takes in requests from multiple threads or sources and let's them in one at a time, so there is no collision. Xml /is/ a 'data' base. What you are referring to as a database is a Sql relational database. Tables in a relational database are orthogonal. Each record has all the fields of all the others, and no more. Xml is a hierarchical database. But, it is also 'ragged'. Not all nodes have to have the same attributes, or child nodes. For many uses, Xml could be idea. That is why I am interested in creating this web service. I also feel that many web 'database' applications need only a single table with very complicated nodes. In that case, a relational database, such as sql server, is the *wrong* choice for web-data applications; and Xml could be *very* useful. [quoted text, click to view] > hi, > > XML is best when its used as a data exchange document, and not as a > database as such. The reason i don't recomend using it as a database > (shared amongst users) is that you end up writing a lot of locking code to > ensure that when one user is updating the document others cannot write to > it and things like that. > > Now suppose 2 users tried to update at the same time, ones request will > pass through other will fail since the document gets locked. > > FOr multiple read/write the best source to store data is a database!! Its > meant to help you d multiple read/writes without locking the users. > > > -- incognito @ http://kentpsychedelic.blogspot.com/
Hi,
If you read my post the main reason I have stated to not go for XML as a database, is that you need to write a lot of code to get multi-threading right! Not everyone is able to write multi-threaded applications correctly...plus you loose all the other features RDBMS system provide to you like Transactions, Security, etc. I agree with the benefits you have listed which would warrent using XML as a datasource, but for most users they tend to use it in the same format as one uses a RDBMS. -- Regards, Saurabh Nandu AksTech Solutions, reflecting your needs... [ www.AksTech.com ] [ www.MasterCSharp.com ] [quoted text, click to view] "Guy LaRouche" wrote:
> Saurabh Nandu wrote: > > Actually, I already created a Windows service that allows multithreaded > access to an XmlDocument for simulaneous 'users' to read/write. I use the > Mutex class. I mutex is like queueing system, it takes in requests from > multiple threads or sources and let's them in one at a time, so there is no > collision. > > Xml /is/ a 'data' base. > > What you are referring to as a database is a Sql relational database. > Tables in a relational database are orthogonal. Each record has all the > fields of all the others, and no more. > > Xml is a hierarchical database. But, it is also 'ragged'. Not all nodes > have to have the same attributes, or child nodes. > > For many uses, Xml could be idea. That is why I am interested in creating > this web service. > > I also feel that many web 'database' applications need only a single table > with very complicated nodes. In that case, a relational database, such as > sql server, is the *wrong* choice for web-data applications; and Xml could > be *very* useful. > > > hi, > > > > XML is best when its used as a data exchange document, and not as a > > database as such. The reason i don't recomend using it as a database > > (shared amongst users) is that you end up writing a lot of locking code to > > ensure that when one user is updating the document others cannot write to > > it and things like that. > > > > Now suppose 2 users tried to update at the same time, ones request will > > pass through other will fail since the document gets locked. > > > > FOr multiple read/write the best source to store data is a database!! Its > > meant to help you d multiple read/writes without locking the users. > > > > > > > > -- > incognito @ http://kentpsychedelic.blogspot.com/ >
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