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DotNetNuke 5 Hosting - ASPHostPortal :: Caching in DNN 5

clock July 26, 2011 06:28 by author Jervis

One of the hidden gems in DotNetNuke 5.0 is the new caching support in the CBO (Custom Business Objects) class. During the refactoring of DotNetNuke for the Cambrian release, caching was one of the things that was closely looked at, since caching was starting to cause major issues in the DNN 4.x branch.

Lets take a look at how caching was done in DNN 4:

Public Shared Function GetSecureHostSettings() As HashtableDim h As Hashtable
h = CType(DataCache.GetCache("GetSecureHostSettings"), Hashtable)
If h Is Nothing Then
h = New HashtableDim SettingName As StringDim dr As IDataReader =
DataProvider.Instance().GetHostSettingsWhile dr.Read()

If Not Convert.ToBoolean(dr(2)) Then
SettingName = dr.GetString(0)
If SettingName.ToLower.IndexOf("password") = -1 ThenIf Not dr.IsDBNull(1) Then
h.Add(SettingName, dr.GetString(1))
Else
h.Add(SettingName, "")
End IfEnd IfEnd IfEnd While
dr.Close()
DataCache.SetCache("GetSecureHostSettings", h)
End
IfReturn hEnd Function

This is code from the class DotNetNuke.Entities.Host.HostSettings in DNN 4.9.3. In fact this is a pattern that is used throughout the application in DNN 3.x – 4.x. The problem with this pattern is that it is not completely thread safe, especially if it is used in larger routines, and specifically on large and busy sites. There might be a chance that the object you get from the cache is removed from cache when you want to use it.


In DotNetNuke 5.x, the CBO class was beefed up with a new caching function:

Public
Shared Function GetCachedObject(Of TObject)(ByVal cacheItemArgs As CacheItemArgs, ByVal cacheItemExpired As CacheItemExpiredCallback) As TObjectReturn DataCache.GetCachedData(Of TObject)(cacheItemArgs, cacheItemExpired)
End
Function

which in turn calls a new method of DataCache, GetCachedData. This method looks like this:

Public
Shared Function GetCachedData(Of TObject)(ByVal cacheItemArgs As CacheItemArgs, ByVal cacheItemExpired As CacheItemExpiredCallback) As TObject'Declare Local Variable and try and retieve it from the cacheDim objObject As Object = GetCache(cacheItemArgs.CacheKey)
Dim
timeOut As Integer = cacheItemArgs.CacheTimeOut * Convert.ToInt32(Host.PerformanceSetting)
'If Item is not cachedIf objObject Is Nothing Then'Prevent other threads from entering this block while we regenerate the cacheSyncLock objLock'Try to retrieve object from Cache again (in case another thread loaded the object since we first checked)
objObject = GetCache(cacheItemArgs.CacheKey)
If
objObject Is Nothing Then'Get Object from data Source using Delegate
objObject = cacheItemExpired(cacheItemArgs)
If
objObject IsNot Nothing AndAlso timeOut > 0 Then
DataCache.SetCache(cacheItemArgs.CacheKey, objObject, cacheItemArgs.CacheDependency, Cache.NoAbsoluteExpiration, _

TimeSpan.FromMinutes(timeOut), cacheItemArgs.CachePriority, cacheItemArgs.CacheCallback)
'Check if Item was actually saved in the cacheIf DataCache.GetCache(cacheItemArgs.CacheKey) Is Nothing ThenDim objEventLogInfo As New LogInfo
objEventLogInfo.LogTypeKey = EventLogController.EventLogType.CACHE_ERROR.ToString()
objEventLogInfo.LogProperties.Add(New LogDetailInfo(cacheItemArgs.CacheKey, "Not Created"))
Dim
objEventLog As New EventLogController()
objEventLog.AddLog(objEventLogInfo)
End
IfElseIf objObject Is Nothing ThenReturn NothingEnd IfEnd IfEnd SyncLockEnd IfReturn DirectCast(objObject, TObject)
End
Function

As you can see, this is basically still the same pattern as the “old” pattern in DNN 3.x/4.x, however, with a few enhancements:

- Thread safety. Using Synlock, other threads are prevented to intrude when we are handling the object
- automatic callback is used, that will get called when the object is not found in cache
- check to ensure object was saved to cache correctly

As an example of the usage of the new pattern, let’s see how Host.GetSecureHostSettings was modified in DNN 5:

Public Shared Function GetSecureHostSettingsDictionary() As Dictionary(Of String, String)
Return CBO.GetCachedObject(Of Dictionary(Of String, String))(New CacheItemArgs(DataCache.SecureHostSettingsCacheKey, _
DataCache.HostSettingsCacheTimeOut, _
DataCache.HostSettingsCachePriority), _AddressOf GetSecureHostSettingsDictionaryCallBack)
End Function

And the corresponding callback function:

Private Shared Function GetSecureHostSettingsDictionaryCallBack(ByVal cacheItemArgs As CacheItemArgs) As ObjectDim dicSettings As New Dictionary(Of String, String)
Dim dr As IDataReader = DataProvider.Instance().GetHostSettingsTryWhile dr.Read()
If
Not Convert.ToBoolean(dr(2)) ThenDim settingName As String =
dr.GetString(0)

If settingName.ToLower.IndexOf("password") = -1 ThenIf Not dr.IsDBNull(1) Then
dicSettings.Add(settingName, dr.GetString(1))
Else
dicSettings.Add(settingName, "")
End IfEnd IfEnd IfEnd WhileFinallyIf Not dr Is Nothing Then
dr.Close()
End
IfEnd TryReturn dicSettingsEnd Function

As you can see, the callback function GetSecureHostSettingsDictionaryCallBack is essentially the same as the old method, minus the caching logic. It has become far more easier to use caching in your own module using this pattern. A few lines of code will do the trick.

Reasons why you must trust ASPHostPortal.com

Every provider will tell you how they treat their support, uptime, expertise, guarantees, etc., are. Take a close look. What they’re really offering you is nothing close to what ASPHostPortal does. You will be treated with respect and provided the courtesy and service you would expect from a world-class web hosting business.

You’ll have highly trained, skilled professional technical support people ready, willing, and wanting to help you 24 hours a day. Your web hosting account servers are monitored from three monitoring points, with two alert points, every minute, 24 hours a day, 7 days a week, 365 days a year. The followings are the list of other added- benefits you can find when hosting with us:

-
DELL Hardware
Dell hardware is engineered to keep critical enterprise applications running around the clock with clustered solutions fully tested and certified by Dell and other leading operating system and application providers.
- Recovery Systems
Recovery becomes easy and seamless with our fully managed backup services. We monitor your server to ensure your data is properly backed up and recoverable so when the time comes, you can easily repair or recover your data.
- Control Panel
We provide one of the most comprehensive customer control panels available. Providing maximum control and ease of use, our Control Panel serves as the central management point for your ASPHostPortal account. You’ll use a flexible, powerful hosting control panel that will give you direct control over your web hosting account. Our control panel and systems configuration is fully automated and this means your settings are configured automatically and instantly.
- Excellent Expertise in Technology
The reason we can provide you with a great amount of power, flexibility, and simplicity at such a discounted price is due to incredible efficiencies within our business. We have not just been providing hosting for many clients for years, we have also been researching, developing, and innovating every aspect of our operations, systems, procedures, strategy, management, and teams. Our operations are based on a continual improvement program where we review thousands of systems, operational and management metrics in real-time, to fine-tune every aspect of our operation and activities. We continually train and retrain all people in our teams. We provide all people in our teams with the time, space, and inspiration to research, understand, and explore the Internet in search of greater knowledge. We do this while providing you with the best hosting services for the lowest possible price.
- Data Center
ASPHostPortal modular Tier-3 data center was specifically designed to be a world-class web hosting facility totally dedicated to uncompromised performance and security
- Monitoring Services
From the moment your server is connected to our network it is monitored for connectivity, disk, memory and CPU utilization – as well as hardware failures. Our engineers are alerted to potential issues before they become critical.
- Network
ASPHostPortal has architected its network like no other hosting company. Every facet of our network infrastructure scales to gigabit speeds with no single point of failure.
- Security
Network security and the security of your server are ASPHostPortal’s top priorities. Our security team is constantly monitoring the entire network for unusual or suspicious behavior so that when it is detected we can address the issue before our network or your server is affected.
- Support Services
Engineers staff our data center 24 hours a day, 7 days a week, 365 days a year to manage the network infrastructure and oversee top-of-the-line servers that host our clients’ critical sites and services.



DotNetNuke 5 Hosting - ASPHostPortal :: How to Call Web Service from your DotNetNuke Module

clock July 18, 2011 06:55 by author Jervis

There are times when you’d like to make a call to an external web service from your DotNetNuke module to process or get some data.

Add a Service Reference to your Module Project

In your module solution, right-click on the “References”, folder and select “Add Service Reference…



The “Add Service Reference” dialog will open, paste the URL of the web service you want to access in the Address field and click the “Go” button.  If the service is available, you will see the publicly available services listed in the “Services” list box on the left.



At the bottom of the dialog box, enter a namespace that you will be using to reference the service. In this example, I enter “WeatherService”.  Later on , I will be using that Namespace and the Service name as shown in the dialog to create a client proxy that I can use to execute the functions exposed by the service. Click the “OK” button to have Visual Studio add the reference to your project.



Now, back at our project, you will see the “WeatherService” listed under the “Service References” folder.



Copy the web.config generated settings to the root web.config of your DNN site

You’ll also notice that a new web.config file has been added to your project. Open the web.config file and you’ll see a bunch of settings that your DNN web site needs in order to be able to access the web service. However, these settings need to be in the web.config that resides in the root folder of your DNN web site. So copy the system.serviceModel section from the web.config in your project folder and paste it at the end of the web.config file in your DNN web site root folder, just after the closing </dotnetnuke>  tag, and before the closing </configuration> tag.

If the web.config in your DNN root folder already has a system.serviceModel section, you’ll have to “merge” the tags from your module into the root config file.

NOTICE: In the <client> section, take a look at the client endpoint configuration data, in particular, the “name” property. You’ll need that name later on, so you might want to copy it to your clipboard for later use.

<client>

  <endpoint address=http://www.webservicex.net/WeatherForecast.asmx
    binding="basicHttpBinding"
    bindingConfiguration="WeatherForecastSoap"
    contract="WeatherService.WeatherForecastSoap"
    name="WeatherForecastSoap" />
</client>

Once you’ve pasted the web.config settings into the root web.config, Delete the web.config file from your project folder.

Write the code-behind to access the web service

That’s all we need to do to be able to access a web service from our module. So, for this example, we’ll use the service to lookup a town name based on a zip code. The service exposes a method

At the top of our module, add a using statement and pull in the namespace of the web service

using DNNws.WeatherService;

In this simple example, I have a div named hw_content on my module’s ascx page. In the Page_Load() method, we’ll make a call to the web service, pass in a zip code, and grab the City name (PlaceName) from the results of the service call.

  1: private void Page_Load(object sender, System.EventArgs e)
  2: {
  3:     try
  4:     {
  5:         using (var svc = new WeatherForecastSoapClient("WeatherForecastSoap"))
  6:         {
  7:             var results = svc.GetWeatherByZipCode("07871");
  8:             hw_content.InnerHtml = string.Format("Hello {0}", results.PlaceName);
  9:         }
 10:     }
 11:     catch (Exception exc) //Module failed to load
 12:     {
 13:         Exceptions.ProcessModuleLoadException(this, exc);
 14:     }
 15: }

On line 5, we create a proxy object that we’ll be using to access the service.

When Visual Studio added the service reference to our project, it also created a proxy class named “WeatherForecastSoapClient” that we will use. We need to pass the endpoint “name” that we want to use to access the service, so pass the value of the “name” property from the web.config client tag you copied earlier.

Once we have a service proxy object (svc), we simply call the method “GetWeatherByZipCode” and pass the required zip code parameter.  NOTE: Intellisense makes method discovery very easy, just start typing svc, period and you’ll see a list of the available methods and their signatures.

The call is made on line 7, and on line 8, we take the “PlaceName” property of the result and we create a string and set it inside our div on our ascx file.

Running our DNN site and placing an instance of our module on a page, results in the view being displayed, during Page_Load(), an instance of the web service proxy is created and we use that proxy to connect to the web service, execute the GetWeatherByZipCode method, pass in a zip code and the PlaceName property is used to construct a welcome message, which looks like this…



Reasons why you must trust ASPHostPortal.com

Every provider will tell you how they treat their support, uptime, expertise, guarantees, etc., are. Take a close look. What they’re really offering you is nothing close to what ASPHostPortal does. You will be treated with respect and provided the courtesy and service you would expect from a world-class web hosting business.

You’ll have highly trained, skilled professional technical support people ready, willing, and wanting to help you 24 hours a day. Your web hosting account servers are monitored from three monitoring points, with two alert points, every minute, 24 hours a day, 7 days a week, 365 days a year. The followings are the list of other added- benefits you can find when hosting with us:

-
DELL Hardware
Dell hardware is engineered to keep critical enterprise applications running around the clock with clustered solutions fully tested and certified by Dell and other leading operating system and application providers.
- Recovery Systems
Recovery becomes easy and seamless with our fully managed backup services. We monitor your server to ensure your data is properly backed up and recoverable so when the time comes, you can easily repair or recover your data.
- Control Panel
We provide one of the most comprehensive customer control panels available. Providing maximum control and ease of use, our Control Panel serves as the central management point for your ASPHostPortal account. You’ll use a flexible, powerful hosting control panel that will give you direct control over your web hosting account. Our control panel and systems configuration is fully automated and this means your settings are configured automatically and instantly.
- Excellent Expertise in Technology
The reason we can provide you with a great amount of power, flexibility, and simplicity at such a discounted price is due to incredible efficiencies within our business. We have not just been providing hosting for many clients for years, we have also been researching, developing, and innovating every aspect of our operations, systems, procedures, strategy, management, and teams. Our operations are based on a continual improvement program where we review thousands of systems, operational and management metrics in real-time, to fine-tune every aspect of our operation and activities. We continually train and retrain all people in our teams. We provide all people in our teams with the time, space, and inspiration to research, understand, and explore the Internet in search of greater knowledge. We do this while providing you with the best hosting services for the lowest possible price.
- Data Center
ASPHostPortal modular Tier-3 data center was specifically designed to be a world-class web hosting facility totally dedicated to uncompromised performance and security
- Monitoring Services
From the moment your server is connected to our network it is monitored for connectivity, disk, memory and CPU utilization – as well as hardware failures. Our engineers are alerted to potential issues before they become critical.
- Network
ASPHostPortal has architected its network like no other hosting company. Every facet of our network infrastructure scales to gigabit speeds with no single point of failure.
- Security
Network security and the security of your server are ASPHostPortal’s top priorities. Our security team is constantly monitoring the entire network for unusual or suspicious behavior so that when it is detected we can address the issue before our network or your server is affected.
- Support Services
Engineers staff our data center 24 hours a day, 7 days a week, 365 days a year to manage the network infrastructure and oversee top-of-the-line servers that host our clients’ critical sites and services.



About ASPHostPortal.com

We’re a company that works differently to most. Value is what we output and help our customers achieve, not how much money we put in the bank. It’s not because we are altruistic. It’s based on an even simpler principle. "Do good things, and good things will come to you".

Success for us is something that is continually experienced, not something that is reached. For us it is all about the experience – more than the journey. Life is a continual experience. We see the Internet as being an incredible amplifier to the experience of life for all of us. It can help humanity come together to explode in knowledge exploration and discussion. It is continual enlightenment of new ideas, experiences, and passions


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