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Ashraful Alam is a Software Architect, who has 8 years of professional experience in Software Development industry. This Bangladeshi national is involved with project management and development of several US based software projects from his country. Already he has managed and developed several software projects, which are being used by several users of different countries, such as USA, Canada, Australia, and Bangladesh. While developing and managing a team, he contains and maintains a set of well defined engineering practices developed by him and other online developer communities.

Due to his willingness to give effort to improve and share better software development practices, Ashraf has been awarded as “Most Valuable Professional” (MVP) in ASP.NET category by Microsoft since year 2007 multiple times, which is a rare honor and prestigious reorganization among the developers around the world.

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Aggregator Provider Pattern is an extension of Provider Pattern, which enables us to create and utilize multiple instance of the class having the same provider interface. In this pattern, there is an Aggregator class which implements the provider interface and contains a collection of instances of classes having the same provider interface.

The underlying caller class of this aggregator is simply unaware of how many provider instances do the caller Provider Aggregator contains, but all of the provider instances will be utilized with a single invocation from the caller class.


Comparison with Provider Pattern

Provider Aggregator Pattern is fully compatible with the existing Provider Pattern and the power of provider pattern can be easily extended to use multiple providers concurrently without any modification on the caller classes that were using a provider.

In short Provider Pattern is concerned with the utilization of one of the available providers; whereas Aggregator Provider Pattern is concerned with the utilization of all of the available providers at the same time.

Example Demonstration

Aggregator Provider Pattern is useful when we need a configurable framework to add/remove multiple services used by one caller/user. For instance we can have Logger Provider framework, where we need log info to be saved at text files, save to database and sent to email addresses and so on. Having an easy configurable framework along with Aggregator Provider Pattern will enable us to add or remove more services without requiring the code modification in the code that uses this provider.


Regarding the example case that just been described can utilize the Aggregator Provider Pattern, by creating the classes as illustrated above. The code snippet below shows a basic usage of this pattern, where the last line will perform the log operation based in list of log providers loaded in the aggregator class dynamically.


Download the latest white paper and samples from MSDN Code Gallery.


Posted on Friday, April 10, 2009 10:29 PM | Back to top

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