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JAVAERO - The Javaero held it’s fourth seminar last November 17, 2006 featuring topics in eclipse framework and performance theory. Oliver Yanto presented to the group how to extend eclipse capabilities using the plugin development tool. On the first part of the presentation he covered on the design of eclipse, the parts of a workbench and the plugin development environment. The second part was spent on a demonstration of an actual plugin which he coded especially for this presentation.

Mr. Yanto called his plugin the ImageViewer. It has the capability to view images on the workspace by right-clicking on the filename and choosing view image.

The plugin will open a new window that will display the image at the center. At the top of this image is arrows that point to the left and right. Below the image is a small region which gives a preview of three images. At the center you will see the current image being viewed, the left and right images correspond to the images that will appear on the image region when you click on the right and left arrows on top.

The second topic of the seminar was presented by Bobby Corpus. He showed the theoretical basis of the 2/3 design rule for computer systems performance. He also showed why performance degrades when utilization approaches 100%. A table of values showed how this degradation is very non-linear. Scaling effect was also demonstrated by comparing the capacity of a given server to a twice-as-fast server. It was shown that you can load the faster server up to 3 times it’s capacity while still maintaining the same level of service provided by the slower server.

The next seminar will discuss the hard-core approach to AJAX and some useful plugins of Maven.

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JAVAERO — Part of the current phase for the Javaero community is the realization and reflection that they have to undergo skills and knowledge sharing break-ins by way of conducting informal, lightweight, and ad-hoc presentation sessions. The objective is to evaluate the readiness to share and measure the depth of its bench with regards to skill-set and knowledge.

Last October 26, 2006, a Thursday, about half of the founding members, organized such a meet and went ahead by assigning two resources to conduct the following topics:

1. Web Services presented by Aurelio Pascual …

Web Services, the core motivation for Service Oriented Architecture (SOA) is driven by 3 underlying technologies, namely SOAP, UDDI, and WSDL also known as WUST.

The presenter gave a brief description of Web Services and then he gave us a live walk-through of how to setup a SOAP stub on one among the many Web Services available in the Internet, in this particular case, he showed us how to interface with the “Who wants to be a millionaire” web service.

Using the Eclipse Open Source IDE for Java made by IBM, on-the-fly he showed his audience how simple it was to plug-in a Eclipse Web Service tool which automatically loaded all the libraries necessary to instantiate the service and use it right away without undergoing low-level plumbing.

The convenience provided by the elegant simplicity of the process was surprising because to do the same thing in PHP it would require the developer to understand and tweak the XML-based envelop — nothing like that was ever observed. Amazing as the technology was, we were already playing the game in no time.

See this link to see more details about this lecture.

2. Performance 101 presented by Bobby Corpus

The second act was a theoretical presentation on how to compute the cost of performance. The simple yet elegant lecture showed that given the rate of an entity, the cost to maintain it and the expected ideal rate how it can impact cost-affectivity and ultimately be used to compare performances between entities. Without the statistical tools in the form of equations (), the analyst would have resorted to guessing the better performing entity.

See article posting of Performanace 101 to appreciate its context.

The ad-hoc break-in presentation session was not without problems. We original agreed to meet at Figaro in Robinsons Galleria where a hot spot is made available free as a marketing come-on, unfortunately their WIFI service was not available at that time. Luckily, one of the founding members, Wendell Encomienda, then volunteered his home where he has a SmartBro subscription and also operating a WIFI service within his premises. This kind of persistence for the group paid-off as we come to realize the value of the presentations to us which made the core Javaero members decide this ad-hoc sessions will be formalized as a regular every Thursday break-in sessions.

Next topic presenter will be Edison Macabebe and Wendell Encomienda.

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