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Counting on Synergy

By Richard Morris, Posted on May 16, 2010 at 9:13 pm

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One of our customers, Ibcos Computers, has used Synergy/DE to develop a web server. It may sound a bit bland, but it’s actually quite cool. In simple terms they have a server program running, written in Synergy, which accepts inbound resource requests. Each request then causes a child processes (again in Synergy) to be created to honour the request and return the required data. That data may be a web page, an image, or data as a result of executing some existing Synergy logic from their application.

Well, so far so good. The web server application works a treat. They can host complete web sites, and execute tried and tested logic from their Synergy application accessing their Synergy DBMS data. However, the way the Synergy/DE licensing works means that every time a child processes is created it consumes a Synergy license. This is a very valid situation – you are running a Synergy process, so you consume a Synergy license. Although you are running a Synergy process, that process may simply be locating and returning a resource associated with a web page, for example an image. When a web browser is loading a page from a web server it will asynchronously request many page resources at the same time. This means for a single page the web server may have many child processes executing, so the page can load quicker. It can be argued that although there are a number of live processes, each consuming a Synergy license, there is actually only one user, or client, which is the web browser.

Ibcos also have additional execution models for their web server. They have client applications that “log-in” to the site, execute Synergy logic to process data, then “log-out”. For this model, each connection does, and should, consume a Synergy runtime.

The challenge here is to reliably and accurately count the number of users actually accessing the web server. From a licence enforcement aspect, each resource is allocating a Synergy runtime license. However, Ibcos require a license entitlement model that would allow them to monitor individual types of connections, and be able to identify when pools of connections actually relate to an individual user.

For a solution Ibcos looked towards Synergex. I wrote a specification and they commissioned us to write the required code to utilise the Synergy/DE Licensing Toolkit to monitor license usage. Ibcos can use the Synergy/DE Licensing Toolkit to create and register licensed products within the Synergy/DE License Manager. As the different user types access the Web server, license slots are allocated and released, as required, around the logic being processed. A background process has been written that monitors license usage every five seconds. This information is stored and a program to report on license usage levels has been created. Synergex can then utilise this information to assist Ibcos with their license entitlement requirements.

Ibcos Computers, based in Poole, England, provides software solutions, written in Synergy, to the Agricultural, Ground Care, Construction, Material Handling, Commercial Vehicle and Industrial Dealer markets. Ibcos Gold, their main Synergy/DE UI Toolkit based application, has an installed base of over 500 customers and utilise the latest version 9.3 capabilities.

If you would like more details about License Enforcement and Entitlement, and the synergy Licensing Toolkit you can comment against this blog, email me at richard.morris@synergex.com, or visit the resource pages at www.synergyde.com.


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