D45 General Platform Maintenance

Overview

The Rodin platform versions concerned by this deliverable are:

• 2.1(08.02.2011),
• 2.2(01.06.2011),
• 2.2.2(01.08.2011),
• 2.3(04.10.2011),
• 2.4(31.01.2011),
• 2.5(30.04.2011).

This year, the maintenance carried on fixing identified bugs, although an emphasis was put on correcting usability issues. Indeed, during the annual meeting in Nice, the WP9 members agreed to refocus on the needed tasks to address some specific bugs and issues reported by DEPLOY partners, and wished resolved by the end of DEPLOY. Thus, no new features were implemented but those appearing in the description of work. The tasks to be performed by the WP9 members were then scheduled, prioritized and regularly updated during the WP9 bi-weekly meetings. The updates allowed to capture and integrate rapidly some minor changes to enhance the usability of the platform which were required by the DEPLOY partners. The following paragraphs will give an overview of the the work that has been performed concerning maintenance on the existing platform components (i.e. core platform and plug-ins).

See the Release Notes and the SourceForge databases (bugs and feature requests) for details about the previous and upcoming releases of the Rodin platform.

• General platform maintenance

The maintenance done to overcome Rodin scalability weaknesses and enhance the proving experience will be detailed in a separate chapter. However, some features initially planned and some other which were later added and prioritized are worth to mention:

• Possibility to highlight patterns in the ProverUI,
• A better output providing warnings and errors in case of wrong or missing building configurations,
• The switch to Eclipse 3.7,
• A Handbook to complete and enhance the existing documentation.

• TODO An overview of the contribution about Mathematical extensions / Theory Plug-in (Issam Maamria)

• TODO An overview of the contribution about Plug-in Incompatibilities (All partners)

• TODO An overview of the contribution about Modularisation (Alexei Illiasov)

• TODO An overview of the contribution about Decomposition (Renato Silva)

• TODO An overview of the contribution about Team-based Development (Colin Snook, Vitaly Savicks)

• TODO An overview of the contribution about UML-B (Colin Snook, Vitaly Savicks)

An overview of the contribution about ProR (Michael Jastram)

ProR is a replacement of the original requirements plug-in, which got discontinued in 2010. It is based on the OMG ReqIF standard (), which provides interoperability with industry tools. It evolved into the Eclipse Foundation project "Requirements Modeling Framework" (RMF, ), resulting in significant visibility. ProR is independent from Rodin. Integration is achieved with a separate plug-in that provides support for traceability and model integration.

Motivations

The tasks to solve the issues faced by the DEPLOY partners have been listed and have been assigned to groups according to their priority. A high priority means a high need in the outcome of a given task. The group 1 has the highest priority, the group 2 has an intermediate priority, and the group 3 has the lowest priority. The group 4 concerns topics that could not be resourced during the lifetime of DEPLOY.The prover integrity item, although not being directly covered, has been partially addressed thanks to Isabelle and SMT integration. Unfortunately, the originally planned export of full proofs and integrity check was too ambitious to be fully achieved in the scope of DEPLOY.

Group 1 (highest priority)	Responsible
Performance - Core (large models, etc.) - GUI (incl. prover UI, edition, etc.)	SYSTEREL
Prover Performances - New rewriting rules / inference rules - Automatic tactics (preferences, timeout, etc.)	SYSTEREL
ProB Disprover (incl. counter examples to DLF POs)	Düsseldorf
Stability (crash, corruption, etc.)	SYSTEREL
Editors	SYSTEREL/Düsseldorf

Group 2	Responsible
Prover Performances - SMT provers integration - connection with Isabelle - Mathematical extensions - ProB	SYSTEREL ETH Zürich Southampton/SYSTEREL Düsseldorf
Scalability - Decomposition - Modularisation plug-in - Team-based development	Southampton Newcastle Southampton
Plug-in incompatibilities	Newcastle
Model-based testing	Pitesti/Düsseldorf
ProR	Düsseldorf

Group 3	Responsible
Scalability - Generic instantiation - UML-B maintenance	Southampton ETH Zürich/Southampton
Code Generation	Southampton

Group 4
Prover Integrity
Integrity of Code Generation

Platform maintenance

The platform maintenance, as it can be deduced from the above tables in section Motivations, mainly concerned stability and performance improvement. These topics will be discussed and detailed in a separate chapter about scalability improvements.
However, other improvements of utmost importance were made on the platform. These improvements either came from DEPLOY partners specific needs, or were corresponding to previously identified needs (listed in D32 - Model Construction tools & Analysis III Deliverable). Hence we review below the motivations of some noteworthy implemented features:

• A Possibility to highlight patterns in the Prover UI.

This feature came from a request of DEPLOY partners, often facing the need to find particular patterns such as expressions in long predicates (e.g. long goals). Since Rodin 2.2, and its new Proving UI interface, a nice feature was added, allowing to search and highlight a string pattern into the whole Proving UI views and editors. This function as also been enabled on direct selection of text in this UI.

• A better output providing warnings and errors in case of wrong or missing building configurations.

This issue, often seen as a bug or as a plug-in incompatibility, was raised when a user imports and tries to use a model on a platform with some missing required plug-ins. The user often thought his models corrupted whereas Rodin was not able to build them, and hid this information to the user. This is why, since Rodin 2.3, an output has been provided in such case, taking the form of warnings or errors that any user can understand and review. This is a first answer to Rodin plug-in incompatibilities issues.

• The switch to Eclipse 3.7.

Due to the major improvements made every year in Eclipse releases and the continuously growing number of contributing projects which are for some of them used as basis for Rodin plug-ins, the Rodin platform follows the evolution and is adapted every year quickly to the latest Eclipse version available. This year, Rodin 2.3 originated the switch from Eclipse 3.6 to Eclipse 3.7.

• A Handbook to complete and enhance the existing documentation.

At the DEPLOY Plenary Meeting in Zürich in 2010, it has been stated that the current documentation, in its state at that time, would not support a engineer starting using the tools without significant help of an expert . Significant efforts to improve the documentation were performed and coordinated by Düsseldorf, and took form of a handbook. The Rodin handbook has the aim to minimize the access to an expert, by providing the necessary assistance to an engineer in the need to be productive using Event-B and the Rodin toolset. The contents of the handbook, user oriented, were originated by some contents of the Event-B wiki.

Mathematical extensions / Theory Plug-in

TODO To be completed by Issam Maamria

Plug-in Incompatibilities

By its extensibility nature, the Rodin platform is susceptible to incompatibilities. Indeed, there are many ways in which incompatibilities could occur, and it occurred in the lifetime of DEPLOY. A good example, is the dependency management. Suppose that a bundle x_v1.0 is needed by a plug-in A (i.e. a dependency from A has been defined to x in at most the version 1.0) and installed in Rodin. Then the plug-in x_v1.1 is needed by a plug-in B. The both versions 1.0 and 1.1 of x could not be installed and used at the same time and create thus some usage incompatibility.

Modularisation

TODO To be completed by Alexei Illiasov

Decomposition

TODO To be completed by Renato Silva

Team-based Development

TODO To be completed by Colin Snook, Vitaly Savicks

UML-B

TODO To be completed by Colin Snook, Vitaly Savicks

ProR

While the original requirements plug-in for Rodin was useful as a prototype, a number of shortcomings lead to a new development. In particular, the original plug-in was a traceability tool with externally managed requirements. With ProR, requirements are authored and edited within Eclipse. The original plug-in supported only a limited number of attributes and flat (unstructured) requirements. ProR supports all data structures that the ReqIF standard supports. Further, ReqIF-support for industry tools like Rational DOORS, MKS or IRqA is expected in the near future, while the original plug-in required a custom adaptor for each data format.

ProR is developed independently from Rodin. Dependencies to Rodin exist only in the Rodin integration plug-in. This significantly decreases the maintenance effort for the integration plugin, while increasing the visibility of ProR in the Open Source community. The move of ProR from the University of Düsseldorf to the Eclipse Foundation increases visibility even further. The Rodin integration plug-in is maintained as an independent project at github.

Choices / Decisions

Platform maintenance

• Revisited task priority

This year, the process of giving priority to maintenance tasks was revisited according the the refocus mentioned above. The aim was to address all the major scalability issues before the end of DEPLOY. Thus, the requests coming from DEPLOY partners were given high priorities, and they were also prioritized against the already planned tasks coming from both DEPLOY partners and the Description of Work.

• Keep 32-bit versions of the Rodin platform on linux and windows systems

It was asked by end users to make both 32-bit and 64-bit versions of the Rodin platform available for Linux and Windows platforms. Only a 64-bit version of Rodin is available on Mac platforms as 32-bit Mac (early 2006) platforms are no longer maintained. The request to offer 64-bit was motivated by the possibility to increase for them the available Java heap size for some memory greedy platforms (these before 2.3). However, the drawbacks of assembling and maintaining more platforms (5 platforms instead of 3) and the corrections brought to the database which improved the memory consumption pushed away the limitations of the platform, made this request not relevant for now.

Mathematical extensions / Theory Plug-in

TODO To be completed by Issam Maamria

Plug-in Incompatibilities

It has been decided in cooperation with all the WP9 partners to find better ways to address the plug-in incompatibility issues. First of all, the various partners refined the concept of "plug-in incompatibility". Hence, various aspects could be identified and some specific answers were given to each of them. The user could then defined more clearly the incompatibility faced. Plug-in incompatibilities can be separated in two categories:

• Rodin platform/plug-in incompatibilities, due to some wrong match between Rodin included packages and the plug-in dependencies (i.e. needed packages). These incompatibilities, when reported, allowed the plug-in developers to contact SYSTEREL in charge of managing the packages shipped with a given version of Rodin. It could also allow traceability of incompatibilities and information to the user through a specific and actualized table on each Rodin release notes page on the Wiki.
• Plug-in/plug-in incompatibilities, due to some wrong match between needed/installed packages, or API/resources incompatible usage. A table was created on each release notes wiki page, and a procedure was defined so that identified incompatibilities are listed and corrected by the concerned developers.

It appeared that cases of using a model which references some missing plug-ins were formerly often seen as compatibility issues although they were not.
After the incompatibilities have been identified, the developing counterparts being concerned assigned special tasks and coordination to solve issues the soonest as possible. Incompatibilities are often due to little glitches or desynchronisation and such direct coordination of counterpart appeared appropriate because quick and effective.

Modularisation

TODO To be completed by Alexei Illiasov

Decomposition

TODO To be completed by Renato Silva

Team-based Development

TODO To be completed by Colin Snook, Vitaly Savicks

UML-B

TODO To be completed by Colin Snook, Vitaly Savicks

ProR

The following key decisions were made when developing ProR:

• New development, rather than continuing the original plug-in - the architecture of ProR differs significantly from that of the original plug-in (see D45_General_Platform_Maintenance#ProR. In addition, new technologies like EMF promised a cleaner, more powerful framework for an implementation.

• ReqIF as the underlying data model - the ReqIF standard is gaining traction and promises interoperability with industry tools. In addition, a digital version of the data model was available for free and could serve as the foundation for the model code.

• The Eclipse Modeling Framework (EMF) was identified as a technology that would allow a quick and clean foundation for an implementation. Further, the Rodin EMF-plug-in represents a convenient interface for integrating ProR and ProB. Last, the digital data model from the OMG could be imported directly into EMF and used for generating the model code.

• Keeping ProR independent from Rodin - There is significant interest in ReqIF right now, but this interest is unrelated to formal methods. By providing an implementation that is independent from Rodin, we have a much larger target group of potential users and developers. By carefully designing extension points, we can still provide a powerful Rodin integration.

• Eclipse Foundation Project - we were actively establishing an open source community around ProR. By recruiting engaged partners early on, development progressed faster than anticipated. By becoming an Eclipse Foundation project , we exceeded our goals in this respect.

Available Documentation

• Core platform:

The following pages give useful information about the Rodin platform releases:

• Release notes.
• Bugs.
• Feature requests.

• The Rodin handbook is proposed as a PDF version and a HTML version and a dedicated plug-in makes it available as help within Rodin.

• TODO Links for Mathematical extensions / Theory Plug-in
• TODO Links for Modularisation
• TODO Links for Decomposition
• TODO Links for Team-based Development
• TODO Links for UML-B
• Links for ProR
  • ProR at the Eclipse Foundation
  • ProR Documentation for end users and plugin developers

Status

Platform maintenance

By the end of the project, there are :

• xx bugs reported and open. All with a priority lower or equal to 5.
• xx feature requests expressed and still open.

Mathematical extensions / Theory Plug-in

TODO To be completed by Issam Maamria

Plug-in Incompatibilities

As the time of writing this deliverable, no plug-in incompatibilities are left or known to exist between the platform and plug-ins or between plug-ins.

Modularisation

TODO To be completed by Alexei Illiasov

Decomposition

TODO To be completed by Renato Silva

Team-based Development

TODO To be completed by Colin Snook, Vitaly Savicks

UML-B

TODO To be completed by Colin Snook, Vitaly Savicks

ProR

TODO To be completed by Michael Jastram