TY  - JOUR
A1  - Steinert, Bastian
A1  - Thamsen, Lauritz
A1  - Felgentreff, Tim
A1  - Hirschfeld, Robert
T1  - Object Versioning to Support Recovery Needs Using Proxies to Preserve Previous Development States in Lively
JF  - ACM SIGPLAN notices
N2  - We present object versioning as a generic approach to preserve access to previous development and application states. Version-aware references can manage the modifications made to the target object and record versions as desired. Such references can be provided without modifications to the virtual machine. We used proxies to implement the proposed concepts and demonstrate the Lively Kernel running on top of this object versioning layer. This enables Lively users to undo the effects of direct manipulation and other programming actions.
KW  - Programming Environments
KW  - Object Versioning
KW  - CoExist
KW  - JavaScript
KW  - Lively Kernel
Y1  - 2015
U6  - https://doi.org/10.1145/2661088.2661093
SN  - 0362-1340
SN  - 1558-1160
VL  - 50
IS  - 2
SP  - 113
EP  - 124
PB  - Association for Computing Machinery
CY  - New York
ER  - 
TY  - JOUR
A1  - Steinert, Bastian
A1  - Cassou, Damien
A1  - Hirschfeld, Robert
T1  - CoExist overcoming aversion to change preserving immediate access to source code and run-time information of previous development states
JF  - ACM SIGPLAN notices
N2  - Programmers make many changes to the program to eventually find a good solution for a given task. In this course of change, every intermediate development state can of value, when, for example, a promising ideas suddenly turn out inappropriate or the interplay of objects turns out more complex than initially expected before making changes. Programmers would benefit from tool support that provides immediate access to source code and run-time of previous development states of interest. We present IDE extensions, implemented for Squeak/Smalltalk, to preserve, retrieve, and work with this information. With such tool support, programmers can work without worries because they can rely on tools that help them with whatever their explorations will reveal. They no longer have to follow certain best practices only to avoid undesired consequences of changing code.
KW  - Design
KW  - Experimentation
KW  - Human Factors
KW  - Continuous Testing
KW  - Continuous Versioning
KW  - Debugging
KW  - Evolution
KW  - Explore-first Programming
KW  - Fault Localization
KW  - Prototyping
Y1  - 2013
U6  - https://doi.org/10.1145/2480360.2384591
SN  - 0362-1340
VL  - 48
IS  - 2
SP  - 107
EP  - 117
PB  - Association for Computing Machinery
CY  - New York
ER  - 
TY  - JOUR
A1  - Steinert, Bastian
A1  - Hirschfeld, Robert
T1  - Applying design knowledge to programming
Y1  - 2012
ER  - 
TY  - JOUR
A1  - Hirschfeld, Robert
A1  - Steinert, Bastian
A1  - Lincke, Jens
T1  - Agile software development in virtual collaboration environments
Y1  - 2011
SN  - 978-3-642-13756-3
ER  - 
TY  - JOUR
A1  - Lincke, Jens
A1  - Appeltauer, Malte
A1  - Steinert, Bastian
A1  - Hirschfeld, Robert
T1  - An open implementation for context-oriented layer composition in ContextJS
JF  - Science of computer programming
N2  - Context-oriented programming (COP) provides dedicated support for defining and composing variations to a basic program behavior. A variation, which is defined within a layer, can be de-/activated for the dynamic extent of a code block. While this mechanism allows for control flow-specific scoping, expressing behavior adaptations can demand alternative scopes. For instance, adaptations can depend on dynamic object structure rather than control flow. We present scenarios for behavior adaptation and identify the need for new scoping mechanisms. The increasing number of scoping mechanisms calls for new language abstractions representing them. We suggest to open the implementation of scoping mechanisms so that developers can extend the COP language core according to their specific needs. Our open implementation moves layer composition into objects to be affected and with that closer to the method dispatch to be changed. We discuss the implementation of established COP scoping mechanisms using our approach and present new scoping mechanisms developed for our enhancements to Lively Kernel.
KW  - ContextJS
KW  - Context-oriented programming
KW  - Open implementations
KW  - Dynamic adaptation
KW  - Scope
Y1  - 2011
U6  - https://doi.org/10.1016/j.scico.2010.11.013
SN  - 0167-6423
VL  - 76
IS  - 12
SP  - 1194
EP  - 1209
PB  - Elsevier
CY  - Amsterdam
ER  -