EMF-IncQuery

EMFxcel: Having Fun with Excel and Eclipse Modeling Tools

In order to be able to do advanced data processing and visualization with technologies I am familiar with, I created a simple tool to process Microsoft Excel® documents using Eclipse Modeling Framework. The solution consists of an Xcore-based Excel domain, and a slightly modified EMF generated editor that is able to open Excel files directly as EMF instance models via Apache POI, and automatically track and propagate changes as the opened file is being simultaneously modified in Excel. I demonstrate live data processing using EMF-IncQuery graph queries, and live data visualization using IncQuery Viewers.

The source code and sample models that belong to this example is found at https://github.com/ujhelyiz/EMF-IncQuery-Examples/tree/master/emfxcel, and it requires the brand new EMF-IncQuery 0.8 release that can be downloaded from the Eclipse Marketplace (among others).

A year's worth of research in retrospect

Submitted by Gábor Bergmann on Sun, 12/29/2013 - 19:17

It's the end of the year according to both the calendar, as well as my research grant. I have spent some of this past year doing research on the connection of OCL and graph queries. I have also tried to explain and illustrate my research topic in previous posts of this very blog, and let the readers keep tabs on what I was up to all this time. Let's do a quick recap.

Measuring up

Submitted by Gábor Bergmann on Fri, 11/29/2013 - 20:00

My previous blog post demonstrated my OCL to EMF-IncQuery transformation OCL2IQ in action. Here I am presenting my first performance measurements to investigate whether this solution fulfills the original promise of my research: delivering efficient, incremental query evaluation for a subset of OCL expressions by transforming them to graph patterns of equivalent semantics, and applying EMF-IncQuery on them.

It is alive!

Submitted by Gábor Bergmann on Thu, 10/31/2013 - 20:46

In one of my earlier blog posts, I have outlined the basic ideas and transformation patterns that accomplish a translation of (a subset of) OCL expressions into graph patterns. The theory was illustrated by running examples from the school case study, where the purpose of querying was to find classmates with the same name. The good news is that I have managed creating an experimental implementation of this translation that maps OCL expressions to equivalent graph patterns.

Xcore meets IncQuery: How the new generation of DSLs are made - talk at EclipseCon Europe 2013

Submitted by István Ráth on Wed, 10/30/2013 - 12:37

The EMF-IncQuery Project is proud to announce our talk at this year's EclipseCon Europe conference titled "Xcore meets IncQuery: How the New Generation of DSLs Are Made".

Have you ever got lost in a complex domain-specific model? Are you familiar with Facebook's Graph Search? Ever wished something like this would be available for your favorite EMF-based tool? It is, it's called EMF-IncQuery. In fact, it can do more than Graph Search, because you can create live queries, meaning you get live updates for your search results as the model is being edited. In the talk, we'll show you some of the most powerful features that this technology can be used for in practice.

See you on 31 October between 14:15 - 14:50 in Seminarräume 1-3!

The technology presented in this talk is the result of a collaboration between Ed Merks, Tamas Szabo (itemis AG) and the EMF-IncQuery team. Read the rest of the blog post below for more information regarding the presentation and the live demos.

Providing incremental updates for queries, part II: expression evaluation

Submitted by Gábor Bergmann on Mon, 09/30/2013 - 19:29

After the overview presented in my previous blog post, I am now going to discuss incremental expression evaluation, a.k.a. the eval() language element, which is my most recent contribution to EMF-IncQuery. The examples continue to rely upon the School metamodel introduced here.

Providing incremental updates for queries, part I

Submitted by Gábor Bergmann on Mon, 08/26/2013 - 19:10

After discussing the importance of modeling and the concept of model queries (with OCL and EMF-IncQuery), one of the introductory blog posts presented the challenge posed by model evolution. Incremental query evluation was suggested then as a solution, without going into the details of how it can be achieved for a query language such as the one of EMF-IncQu

Benchmarking query technologies in EMF based model-validation scenarios

Model Driven Development systems exploit the benefit of instance model validation and model transformation. Ever-growing model sizes used for example in critical embedded systems development require more and more efficient tools. The most time consuming step during model validation or model transformation is the model query step. This benchmark aims to measure batch style query and incremental style query performance of existing EMF based tools. 

Illogical, captain!

Submitted by Gábor Bergmann on Tue, 07/30/2013 - 12:16

After the introductory blog posts on the importance of modeling, the concept of model queries (with OCL and EMF-IncQuery) and model evolution, I demonstrated the translation of OCL expressions into the graph pattern language of EMF-IncQuery, and outlined the general translation patterns in two consecutive posts.

The current post will place the language of EMF-IncQuery in a broader context, show aspects where it its expressive power superior to certain other approaches, and where the current implementation needs to be extended.

Efficient Instance-level Model Validation by Incremental Query Techniques - preliminary

Model Driven Development systems exploit the benefit of instance model validation and model transformation. Ever-growing model sizes used for example in critical embedded systems development require more and more efficient tools. The most time consuming step during model validation or model transformation is the model query step. This benchmark aims to measure batch style query and incremental style query of existing OWL (or RDF) and EMF based tools. 

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