I'm developing a .Net web application and created many helper classes
often using static (shared in VB.Net) methods. Do I need to use the lock
(SyncLock) statement in these methods to prevent multiple web application
threads from using the same method at the same time?
For example, I have a static method that extracts information from a page
request cookie for use by other parts of the application. Since this
happens on every request I thought it would be a waste of resources to
create a new object just to provide the cookie method, so I made it
static. But then I thought if two different requests come into the
application milliseconds apart and two different threads request the same
static cookie method it could cause problems. The method is fast so it is
unlikely multiple threads will have a synchronization problem, but it
could happen (right?) and I do have other static methods take longer to
execute.
I'm not spawing a new thread to do any asynchronous processing, but it is
my understanding that IIS and ASP.Net are inherently multi-threaded when
dealing with page requests from different browsers/computers.
I've googled and searched all over the place but I can't find a clear
answer on if, when or how to use a lock statement in shared methods
specifically with web applications.
What are the general guidelines for using shared methods in web
applications?
Are there better methods for preventing synchronization problems than
using the lock statement?
Any pointers or tips are appreciated.
Dan 5 1954
It's not necessary to lock static methods.
--
HTH,
Kevin Spencer
..Net Developer
Microsoft MVP
Big things are made up
of lots of little things.
"blah, blah, blah" <d@someone.co m> wrote in message
news:Xn******** *************@1 67.206.3.3... I'm developing a .Net web application and created many helper classes often using static (shared in VB.Net) methods. Do I need to use the lock (SyncLock) statement in these methods to prevent multiple web application threads from using the same method at the same time?
For example, I have a static method that extracts information from a page request cookie for use by other parts of the application. Since this happens on every request I thought it would be a waste of resources to create a new object just to provide the cookie method, so I made it static. But then I thought if two different requests come into the application milliseconds apart and two different threads request the same static cookie method it could cause problems. The method is fast so it is unlikely multiple threads will have a synchronization problem, but it could happen (right?) and I do have other static methods take longer to execute.
I'm not spawing a new thread to do any asynchronous processing, but it is my understanding that IIS and ASP.Net are inherently multi-threaded when dealing with page requests from different browsers/computers.
I've googled and searched all over the place but I can't find a clear answer on if, when or how to use a lock statement in shared methods specifically with web applications.
What are the general guidelines for using shared methods in web applications?
Are there better methods for preventing synchronization problems than using the lock statement?
Any pointers or tips are appreciated. Dan
It's hard to say yes or no without knowing exactly what you are doing.
If you posted some code that would be helpful.
I'd disagree with Kevin and say there are certainly static method
scenarios where you need locks to keep the application well behaved.
If each thread operates on data specific to the thread, then no locks
are needed. For example:
public static string GetCookieName(C ookie c)
{
return c.Name;
}
If, on the other hand, multiple threads can access a shared object,
you need to be very careful:
static ArrayList cookieList = new ArrayList();
public static void AddToCookieList (Cookie c)
{
cookieList.Add( c);
}
No matter how fast the above method looks, the chance of corruption
exists because it doesn't prevent multiple threads from getting inside
the Add method.
--
Scott http://www.OdeToCode.com
On Mon, 21 Jun 2004 12:23:55 GMT, "blah, blah, blah" <d@someone.co m>
wrote: I'm developing a .Net web application and created many helper classes often using static (shared in VB.Net) methods. Do I need to use the lock (SyncLock) statement in these methods to prevent multiple web application threads from using the same method at the same time?
For example, I have a static method that extracts information from a page request cookie for use by other parts of the application. Since this happens on every request I thought it would be a waste of resources to create a new object just to provide the cookie method, so I made it static. But then I thought if two different requests come into the application milliseconds apart and two different threads request the same static cookie method it could cause problems. The method is fast so it is unlikely multiple threads will have a synchronization problem, but it could happen (right?) and I do have other static methods take longer to execute.
I'm not spawing a new thread to do any asynchronous processing, but it is my understanding that IIS and ASP.Net are inherently multi-threaded when dealing with page requests from different browsers/computers.
I've googled and searched all over the place but I can't find a clear answer on if, when or how to use a lock statement in shared methods specifically with web applications.
What are the general guidelines for using shared methods in web applications ?
Are there better methods for preventing synchronization problems than using the lock statement?
Any pointers or tips are appreciated. Dan
Well, Scott, you're not really disagreeing with me, but clarifying my
remarks. You are correct, in that, if the static method accesses and
modifies external static data, yes, that data would have to be locked. I
just didn't point that out. Thanks for the clarification.
--
HTH,
Kevin Spencer
..Net Developer
Microsoft MVP
Big things are made up
of lots of little things.
"Scott Allen" <bitmask@[nospam].fred.net> wrote in message
news:7k******** *************** *********@4ax.c om... It's hard to say yes or no without knowing exactly what you are doing. If you posted some code that would be helpful.
I'd disagree with Kevin and say there are certainly static method scenarios where you need locks to keep the application well behaved.
If each thread operates on data specific to the thread, then no locks are needed. For example:
public static string GetCookieName(C ookie c) { return c.Name; }
If, on the other hand, multiple threads can access a shared object, you need to be very careful:
static ArrayList cookieList = new ArrayList();
public static void AddToCookieList (Cookie c) { cookieList.Add( c); }
No matter how fast the above method looks, the chance of corruption exists because it doesn't prevent multiple threads from getting inside the Add method.
-- Scott http://www.OdeToCode.com
On Mon, 21 Jun 2004 12:23:55 GMT, "blah, blah, blah" <d@someone.co m> wrote:
I'm developing a .Net web application and created many helper classes often using static (shared in VB.Net) methods. Do I need to use the lock (SyncLock) statement in these methods to prevent multiple web application threads from using the same method at the same time?
For example, I have a static method that extracts information from a page request cookie for use by other parts of the application. Since this happens on every request I thought it would be a waste of resources to create a new object just to provide the cookie method, so I made it static. But then I thought if two different requests come into the application milliseconds apart and two different threads request the same static cookie method it could cause problems. The method is fast so it is unlikely multiple threads will have a synchronization problem, but it could happen (right?) and I do have other static methods take longer to execute.
I'm not spawing a new thread to do any asynchronous processing, but it is my understanding that IIS and ASP.Net are inherently multi-threaded when dealing with page requests from different browsers/computers.
I've googled and searched all over the place but I can't find a clear answer on if, when or how to use a lock statement in shared methods specifically with web applications.
What are the general guidelines for using shared methods in web applications ?
Are there better methods for preventing synchronization problems than using the lock statement?
Any pointers or tips are appreciated. Dan
Scott,
I assumed the warnings about threading synchronization when using the
static keyword automatically extended to methods as well as variables and
objects. Now it is clear(er) to me how things work. The variables and
parameters used by a method are thread safe unless those variables are
marked as static. Only then do you need to wrap the relevant code in a
lock statement.
Thanks for the explination.
Dan
Scott Allen <bitmask@[nospam].fred.net> wrote in
news:7k******** *************** *********@4ax.c om: It's hard to say yes or no without knowing exactly what you are doing. If you posted some code that would be helpful.
I'd disagree with Kevin and say there are certainly static method scenarios where you need locks to keep the application well behaved.
If each thread operates on data specific to the thread, then no locks are needed. For example:
public static string GetCookieName(C ookie c) { return c.Name; }
If, on the other hand, multiple threads can access a shared object, you need to be very careful:
static ArrayList cookieList = new ArrayList();
public static void AddToCookieList (Cookie c) { cookieList.Add( c); }
No matter how fast the above method looks, the chance of corruption exists because it doesn't prevent multiple threads from getting inside the Add method.
-- Scott http://www.OdeToCode.com
Another approach is to pass immutable data objects or structures to the
static method.
Regards,
Jeff Are there better methods for preventing synchronization problems than
using the lock statement?<
*** Sent via Devdex http://www.devdex.com ***
Don't just participate in USENET...get rewarded for it! This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Axehelm |
last post by:
Okay, I'm in a debate over whether or not static methods are a good idea in
a general domain class.
I'm personally not a fan of static methods but we seem to be using them to
load an object. For example if you have an Employee class rather then
instantiating an instance you call a static method 'GetEmployees' and it
returns a List of Employee objects.
I'm looking for what other people are doing and if you feel this is a good
or bad...
|
by: Neil Zanella |
last post by:
Hello,
I would like to know whether it is possible to define static class methods
and data members in Python (similar to the way it can be done in C++ or Java).
These do not seem to be mentioned in "Learning Python" by Mark Lutz and David
Ascher. It seems like they are a relatively new feature... It seems to me that
any truly OO programming language should support these so I'm sure that Python
is no exception, but how can these be...
|
by: Steven D'Aprano |
last post by:
I've been doing a lot of reading about static methods in Python, and I'm
not exactly sure what they are useful for or why they were introduced.
Here is a typical description of them, this one from Guido:
"The new descriptor API makes it possible to add static methods and class
methods. Static methods are easy to describe: they behave pretty much like
static methods in C++ or Java."
http://www.python.org/2.2.3/descrintro.html
|
by: baylor |
last post by:
In C#, an interface cannot mark any method as static. i'm told the ILASM
supports it but i've never tested that
Two questions. First, why? OK, i've heard the reason about interfaces being
allocated on the stack but that's not a real reason. Which is OK because this
isn't a real question, it's just a complaint dressed up to look like a reason
Second question. If a language doesn't support a fairly obvious feature, one
has to wonder if...
|
by: Steven Livingstone |
last post by:
Anyone able to explain to me why you cannot define an interface that can
then be implemented using static methods?
I understand the C# CLS states this, but just interested in the reasons
behind it.
thanks,
Steven
| |
by: Mauzi |
last post by:
hi,
this may sound odd and noob like, but what is the 'big' difference
between static and non-static funcitons ?
is there any performace differnce?
what is the best way to use them ?
thnx
mauzi
|
by: Jay |
last post by:
Why are there static methods in C#. In C++ static was applied to data only
(I believe) and it meant that the static piece of data was not a part of the
object but only a part of the class (one copy of data as opposed to multiple
instances of the class)
C# is now applying the static concept to methods. Why?, I thought that only
one copy of the methods were loaded into memory not matter how many
instances were created. Is this different...
|
by: Fernando Lopes |
last post by:
Hi there!
Someone has some code sample about when is recommend use a statis method?
I know this methos don't want to be initialized and all but I want to know
when I need to use it.
Tks.
Fernando
|
by: chandu |
last post by:
hello,
i want to know usage of static methods in a class.
is it advantageous or disadvantage to use more static methods in a class.
thank u
|
by: Steve Richter |
last post by:
in a generic class, can I code the class so that I can call a static
method of the generic class T?
In the ConvertFrom method of the generic TypeConvert class I want to
write, I have a call to the static Parse method of the conversion
class.
if (InValue is string)
return T.Parse((string)InValue);
else
return base.ConvertFrom(context, culture, InValue);
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
| |
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
| |
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
|
by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
| |