"Unanticipated Partial Behavioral Reflection"
Dynamic, unanticipated adaptation of running systems is of interest in a variety of situations, ranging from functional upgrades to on-the-fly debugging or monitoring of critical applications. In this paper we study a particular form of computational reflection, called unanticipated partial behavioral reflection, which is particularly well-suited for unanticipated adaptation of real-world systems. Our proposal combines the dynamicity of unanticipated reflection, i.e., reflection that does not require preparation of the code of any sort, and the selectivity and efficiency of partial behavioral reflection. First, we propose unanticipated partial behavioral reflection which enables the developer to precisely select the required reifications, to flexibly engineer the metalevel and to introduce the meta behavior dynamically. Second, we present a system supporting unanticipated partial behavioral reflection in Squeak Smalltalk, called Geppetto, and illustrate its use with a concrete example of a Seaside web application. Benchmarks validate the applicability of our proposal as an extension to the standard reflective abilities of Smalltalk.
ESUG, 04.09.2006
The document discusses methods as first-class objects in Squeak and challenges with bytecode-based approaches. It proposes a meta model for methods with an abstract syntax tree representation to address these challenges. This meta model would support annotations, transformations, reflection and other uses in a causally connected way without relying directly on text or bytecode representations.
This document describes the design and implementation of a backward-in-time debugger called Unstuck for the Squeak programming language. Unstuck records the execution history of a program so developers can view and change the program state at any past point. It uses bytecode instrumentation to trace method executions and object state, and provides a graphical user interface to search the trace and view object values over time. The key challenges addressed are efficiently tracing program execution without excessive slowdowns and reconstructing past state.
This document discusses reflective methods as a way to provide sub-method level reflection in Smalltalk. It proposes annotating the AST with metadata to enable various tools to work with and communicate about code at a finer granularity than just methods. Reflective methods would generate bytecode on demand from an annotated persistent AST. This allows things like type information, profiler data, and debugger information to be stored as annotations and shared between tools. The document demonstrates reflective methods and annotations in Smalltalk through examples of invalidating code, asserting values, and adding type annotations to methods. It also discusses using Reflex as a way to implement partial behavioral reflection through annotating hooksets and links to metaobjects on the AST.
The document discusses reflective methods, which are a way to provide structural and behavioral reflection at the sub-method level in Smalltalk. Reflective methods use annotated abstract syntax trees (ASTs) that are compiled to bytecode on demand. This allows tools to access and modify the AST, enabling uses like pluggable type systems, invalidation of code, and partial behavioral reflection through hooksets. Demo examples are shown for code invalidation, assertions, coverage analysis, and behavior modification with Geppetto. Future work areas include optimizing the AST size and enabling contextual reifications.
A tutorial-like technical presentation that covers fundamental approaches for replication along with their advantages, disadvantages, comparisons with each other etc.
The document discusses various approaches for debugging distributed systems, including offline and online methods. Offline methods discussed are logging using libraries like liblog, pervasive debuggers, time travel using virtual machines, and model checking using tools like MaceMC. Online methods discussed are D3S and CrystalBall. The document provides details on how several of these approaches work, including liblog which intercepts system calls to log data, time-travel virtual machines which take checkpoints to replay execution, and how model checkers represent distributed systems as state machines to check properties.
"Unanticipated Partial Behavioral Reflection"
Dynamic, unanticipated adaptation of running systems is of interest in a variety of situations, ranging from functional upgrades to on-the-fly debugging or monitoring of critical applications. In this paper we study a particular form of computational reflection, called unanticipated partial behavioral reflection, which is particularly well-suited for unanticipated adaptation of real-world systems. Our proposal combines the dynamicity of unanticipated reflection, i.e., reflection that does not require preparation of the code of any sort, and the selectivity and efficiency of partial behavioral reflection. First, we propose unanticipated partial behavioral reflection which enables the developer to precisely select the required reifications, to flexibly engineer the metalevel and to introduce the meta behavior dynamically. Second, we present a system supporting unanticipated partial behavioral reflection in Squeak Smalltalk, called Geppetto, and illustrate its use with a concrete example of a Seaside web application. Benchmarks validate the applicability of our proposal as an extension to the standard reflective abilities of Smalltalk.
ESUG, 04.09.2006
The document discusses methods as first-class objects in Squeak and challenges with bytecode-based approaches. It proposes a meta model for methods with an abstract syntax tree representation to address these challenges. This meta model would support annotations, transformations, reflection and other uses in a causally connected way without relying directly on text or bytecode representations.
This document describes the design and implementation of a backward-in-time debugger called Unstuck for the Squeak programming language. Unstuck records the execution history of a program so developers can view and change the program state at any past point. It uses bytecode instrumentation to trace method executions and object state, and provides a graphical user interface to search the trace and view object values over time. The key challenges addressed are efficiently tracing program execution without excessive slowdowns and reconstructing past state.
This document discusses reflective methods as a way to provide sub-method level reflection in Smalltalk. It proposes annotating the AST with metadata to enable various tools to work with and communicate about code at a finer granularity than just methods. Reflective methods would generate bytecode on demand from an annotated persistent AST. This allows things like type information, profiler data, and debugger information to be stored as annotations and shared between tools. The document demonstrates reflective methods and annotations in Smalltalk through examples of invalidating code, asserting values, and adding type annotations to methods. It also discusses using Reflex as a way to implement partial behavioral reflection through annotating hooksets and links to metaobjects on the AST.
The document discusses reflective methods, which are a way to provide structural and behavioral reflection at the sub-method level in Smalltalk. Reflective methods use annotated abstract syntax trees (ASTs) that are compiled to bytecode on demand. This allows tools to access and modify the AST, enabling uses like pluggable type systems, invalidation of code, and partial behavioral reflection through hooksets. Demo examples are shown for code invalidation, assertions, coverage analysis, and behavior modification with Geppetto. Future work areas include optimizing the AST size and enabling contextual reifications.
A tutorial-like technical presentation that covers fundamental approaches for replication along with their advantages, disadvantages, comparisons with each other etc.
The document discusses various approaches for debugging distributed systems, including offline and online methods. Offline methods discussed are logging using libraries like liblog, pervasive debuggers, time travel using virtual machines, and model checking using tools like MaceMC. Online methods discussed are D3S and CrystalBall. The document provides details on how several of these approaches work, including liblog which intercepts system calls to log data, time-travel virtual machines which take checkpoints to replay execution, and how model checkers represent distributed systems as state machines to check properties.
To Get any Project for CSE, IT ECE, EEE Contact Me @ 09849539085, 09966235788 or mail us - ieeefinalsemprojects@gmail.com-Visit Our Website: www.finalyearprojects.org
Error tolerant resource allocation and payment minimization for cloud systemIEEEFINALYEARPROJECTS
To Get any Project for CSE, IT ECE, EEE Contact Me @ 09849539085, 09966235788 or mail us - ieeefinalsemprojects@gmail.co¬m-Visit Our Website: www.finalyearprojects.org
Error tolerant resource allocation and payment minimization for cloud systemJPINFOTECH JAYAPRAKASH
This paper proposes an error-tolerant resource allocation method for cloud systems that minimizes user payments while guaranteeing task deadlines. It formulates the problem and proposes a polynomial-time solution. It also analyzes task execution lengths based on workload predictions to guarantee deadlines. The method is validated on a VM-enabled cluster and shows it can limit tasks to their deadlines with sufficient resources and keep most tasks within deadlines under competition.
This presentation is an overview of the cases that may slow the execution of SQL Server request.
This presentation was held by Valerii Konstantynov (MCP, MCSA, Senior Software Engineer, Consultant, GlobalLogic) at GlobalLogic Kharkiv Career Day on November 24, 2018.
Video: https://youtu.be/MdpjTbhcQFQ
SE-PgSQL is a PostgreSQL extension that caches access control decisions from SELinux to improve performance. It uses an in-memory userspace access vector cache with a hit rate over 99.9%. The document discusses two issues with invalidating this cache when the underlying SELinux policy or mode changes, and proposes using a new /selinux/status pseudo file to allow lightweight monitoring of SELinux status without system calls. Performance tests show this approach improves the speed of 10 million access checks from 65.44 seconds to 4.71 seconds.
Distributed Systems Theory for Mere Mortals - GeeCON Krakow May 2017Ensar Basri Kahveci
This document provides an overview of distributed systems theory for distributed systems engineers. It discusses key concepts like interaction models, failure modes, consensus problems, and the CAP principle. Hazelcast is used as an example throughout to illustrate how these concepts are applied in practice. The document concludes by emphasizing the importance of understanding fundamental distributed systems principles, even though specific technologies will continue to change over time.
Distributed Systems Theory for Mere Mortals - Java Day Istanbul May 2017 Ensar Basri Kahveci
Distributed systems theory can help understand challenges like scalability, fault tolerance, and consistency. Key concepts include interaction models, failure modes, and consensus algorithms. The CAP theorem states that a distributed system cannot achieve both consistency and availability during network partitions. Hazelcast uses an eventually consistent asynchronous replication model, providing sticky availability with the possibility of losing consistency during failures. Understanding fundamental distributed systems principles prepares engineers for an ever-changing landscape of technologies.
Mark Johnson from Instantiations presented on VA Smalltalk Going Forward. Instantiations has a long history with Smalltalk and is committed to continuing development of VA Smalltalk. VA Smalltalk 7 will include VA Assist, WidgetKit/Controls and GF/ST to modernize and extend the IDE. Future versions will focus on standards compliance, IDE enhancements, and migration readiness technologies to help transition to newer platforms. VA Smalltalk 7 is expected to be generally available in late August 2005 and will continue to be supported by Instantiations.
Xtreams is a stream library for Smalltalk that aims to provide more consistency, strict separation between read and write streams, and scalability through transformations and stacking of streams. It defines core classes for read and write streams, terminals, transforms, substreams, and parsing to provide a consistent streaming API. The project aims to address issues with existing stream libraries and provide future directions like XML processing and backward compatibility.
The document discusses the Pomodoro technique, which is a time management method that uses a timer to break down work into intervals, traditionally 25 minutes in length, separated by short breaks. It involves focusing exclusively on a single task until the timer expires, then taking a short break before starting the next interval. Using this technique can help people train themselves to focus, control multitasking and interruptions, and get tedious tasks completed more efficiently.
This document discusses a programming environment called Loop that is designed to support a prototype-based introduction to object-oriented programming (OOP) for students who have only previously learned structured programming. Loop aims to ease the paradigm shift by starting with a custom environment that delays introducing classes and inheritance, instead focusing on messages, objects, and their interactions through a live object diagram and explicit differentiation between objects and references.
- Bruce Badger introduced Slaps, a Smalltalk LDAP server he created for OpenSkills' needs including authentication, authorization, and storing directory information.
- LDAP is a lightweight protocol for accessing directories, with clients and servers implementing the protocol. Data is stored in a tree structure called the Directory Information Tree (DIT).
- While LDAP may seem complex due to its ASN.1 specification, Slaps implements it in Smalltalk to make configuration and use easier than traditional LDAP servers. The goal is to provide LDAP functionality without the challenges of external servers.
This document discusses reflection in the Squeak programming language. It covers sub-method structural reflection using Reflective Methods, which allow annotations and extensibility at the bytecode level. It also discusses partial behavioral reflection using hooksets and metaobjects to selectively reflect on method execution and message sending. Examples are given for implementing a profiler and pluggable type system using these reflective capabilities.
This document discusses reflection in computational systems. It defines reflective systems as systems that incorporate causally connected structures representing themselves. It discusses structural reflection, which is concerned with static structure, and behavioral reflection, which is concerned with execution. It presents sub-method structural reflection as a way to provide a high-level model of elements within methods. It also discusses partial behavioral reflection using hooksets to selectively reify operations and provide a flexible way to define the protocol between base and meta-levels.
This document discusses reflection in programming languages. It covers:
1. Structural reflection, which models program structures like classes and methods as objects, but does not reflect below the method level.
2. The need for sub-method reflection to support tools that work at finer granularities.
3. The author's approach of using reflective methods, which are annotated abstract syntax trees, to enable both structural and behavioral reflection below the method level.
This document provides an overview of reflection in programming languages and systems. It discusses structural reflection, which models program structures like classes and methods as objects, and behavioral reflection, which allows intercepting and modifying program execution. It presents sub-method structural reflection, which provides an abstract syntax tree representation of methods that supports annotations and extensibility. Finally, it discusses partial behavioral reflection frameworks that allow selectively intercepting and modifying execution at a fine-grained level using meta-objects and hooksets.
This document provides an overview of refactoring and reflection. It discusses refactoring basics like typical refactorings. It also covers refactoring tools in Squeak like the Refactoring Browser. The implementation of the Refactoring Engine is explained, including how it uses an abstract syntax tree (AST) and tree rewriter. Finally, it considers the relationship between refactoring and reflection, noting that refactoring builds its own abstraction layer rather than using the system's reflective capabilities.
Reflection has proved to be a powerful feature to support the design of development environments and to extend languages. However, the granularity of structural reflection stops at the method level. This is a problem since without sub-method reflection developers have to duplicate efforts, for example to introduce transparently pluggable type-checkers or fine-grained profilers. In this paper we present Persephone, an efficient implementation of a sub-method meta-object protocol (MOP) based on AST annotations and dual methods (a compiled method and its meta-object) that reconcile AST expressiveness with bytecode execution. We validate the MOP by presenting TreeNurse, a method instrumentation framework and TypePlug, an optional, pluggable type system which is based on Persephone.
Sub-method Structural and Behavioral ReflectionMarcus Denker
This document discusses extending reflection capabilities to support unanticipated behavioral reflection. It proposes adding sub-method structure and context to reflection. Sub-method structure allows reflection at a finer granularity than methods. Context avoids infinite recursion when reflecting on the whole system. The contributions are unanticipated partial reflection, sub-method structural reflection, partial reflection using annotations, and contextual reflection.
To Get any Project for CSE, IT ECE, EEE Contact Me @ 09849539085, 09966235788 or mail us - ieeefinalsemprojects@gmail.com-Visit Our Website: www.finalyearprojects.org
Error tolerant resource allocation and payment minimization for cloud systemIEEEFINALYEARPROJECTS
To Get any Project for CSE, IT ECE, EEE Contact Me @ 09849539085, 09966235788 or mail us - ieeefinalsemprojects@gmail.co¬m-Visit Our Website: www.finalyearprojects.org
Error tolerant resource allocation and payment minimization for cloud systemJPINFOTECH JAYAPRAKASH
This paper proposes an error-tolerant resource allocation method for cloud systems that minimizes user payments while guaranteeing task deadlines. It formulates the problem and proposes a polynomial-time solution. It also analyzes task execution lengths based on workload predictions to guarantee deadlines. The method is validated on a VM-enabled cluster and shows it can limit tasks to their deadlines with sufficient resources and keep most tasks within deadlines under competition.
This presentation is an overview of the cases that may slow the execution of SQL Server request.
This presentation was held by Valerii Konstantynov (MCP, MCSA, Senior Software Engineer, Consultant, GlobalLogic) at GlobalLogic Kharkiv Career Day on November 24, 2018.
Video: https://youtu.be/MdpjTbhcQFQ
SE-PgSQL is a PostgreSQL extension that caches access control decisions from SELinux to improve performance. It uses an in-memory userspace access vector cache with a hit rate over 99.9%. The document discusses two issues with invalidating this cache when the underlying SELinux policy or mode changes, and proposes using a new /selinux/status pseudo file to allow lightweight monitoring of SELinux status without system calls. Performance tests show this approach improves the speed of 10 million access checks from 65.44 seconds to 4.71 seconds.
Distributed Systems Theory for Mere Mortals - GeeCON Krakow May 2017Ensar Basri Kahveci
This document provides an overview of distributed systems theory for distributed systems engineers. It discusses key concepts like interaction models, failure modes, consensus problems, and the CAP principle. Hazelcast is used as an example throughout to illustrate how these concepts are applied in practice. The document concludes by emphasizing the importance of understanding fundamental distributed systems principles, even though specific technologies will continue to change over time.
Distributed Systems Theory for Mere Mortals - Java Day Istanbul May 2017 Ensar Basri Kahveci
Distributed systems theory can help understand challenges like scalability, fault tolerance, and consistency. Key concepts include interaction models, failure modes, and consensus algorithms. The CAP theorem states that a distributed system cannot achieve both consistency and availability during network partitions. Hazelcast uses an eventually consistent asynchronous replication model, providing sticky availability with the possibility of losing consistency during failures. Understanding fundamental distributed systems principles prepares engineers for an ever-changing landscape of technologies.
Mark Johnson from Instantiations presented on VA Smalltalk Going Forward. Instantiations has a long history with Smalltalk and is committed to continuing development of VA Smalltalk. VA Smalltalk 7 will include VA Assist, WidgetKit/Controls and GF/ST to modernize and extend the IDE. Future versions will focus on standards compliance, IDE enhancements, and migration readiness technologies to help transition to newer platforms. VA Smalltalk 7 is expected to be generally available in late August 2005 and will continue to be supported by Instantiations.
Xtreams is a stream library for Smalltalk that aims to provide more consistency, strict separation between read and write streams, and scalability through transformations and stacking of streams. It defines core classes for read and write streams, terminals, transforms, substreams, and parsing to provide a consistent streaming API. The project aims to address issues with existing stream libraries and provide future directions like XML processing and backward compatibility.
The document discusses the Pomodoro technique, which is a time management method that uses a timer to break down work into intervals, traditionally 25 minutes in length, separated by short breaks. It involves focusing exclusively on a single task until the timer expires, then taking a short break before starting the next interval. Using this technique can help people train themselves to focus, control multitasking and interruptions, and get tedious tasks completed more efficiently.
This document discusses a programming environment called Loop that is designed to support a prototype-based introduction to object-oriented programming (OOP) for students who have only previously learned structured programming. Loop aims to ease the paradigm shift by starting with a custom environment that delays introducing classes and inheritance, instead focusing on messages, objects, and their interactions through a live object diagram and explicit differentiation between objects and references.
- Bruce Badger introduced Slaps, a Smalltalk LDAP server he created for OpenSkills' needs including authentication, authorization, and storing directory information.
- LDAP is a lightweight protocol for accessing directories, with clients and servers implementing the protocol. Data is stored in a tree structure called the Directory Information Tree (DIT).
- While LDAP may seem complex due to its ASN.1 specification, Slaps implements it in Smalltalk to make configuration and use easier than traditional LDAP servers. The goal is to provide LDAP functionality without the challenges of external servers.
This document discusses reflection in the Squeak programming language. It covers sub-method structural reflection using Reflective Methods, which allow annotations and extensibility at the bytecode level. It also discusses partial behavioral reflection using hooksets and metaobjects to selectively reflect on method execution and message sending. Examples are given for implementing a profiler and pluggable type system using these reflective capabilities.
This document discusses reflection in computational systems. It defines reflective systems as systems that incorporate causally connected structures representing themselves. It discusses structural reflection, which is concerned with static structure, and behavioral reflection, which is concerned with execution. It presents sub-method structural reflection as a way to provide a high-level model of elements within methods. It also discusses partial behavioral reflection using hooksets to selectively reify operations and provide a flexible way to define the protocol between base and meta-levels.
This document discusses reflection in programming languages. It covers:
1. Structural reflection, which models program structures like classes and methods as objects, but does not reflect below the method level.
2. The need for sub-method reflection to support tools that work at finer granularities.
3. The author's approach of using reflective methods, which are annotated abstract syntax trees, to enable both structural and behavioral reflection below the method level.
This document provides an overview of reflection in programming languages and systems. It discusses structural reflection, which models program structures like classes and methods as objects, and behavioral reflection, which allows intercepting and modifying program execution. It presents sub-method structural reflection, which provides an abstract syntax tree representation of methods that supports annotations and extensibility. Finally, it discusses partial behavioral reflection frameworks that allow selectively intercepting and modifying execution at a fine-grained level using meta-objects and hooksets.
This document provides an overview of refactoring and reflection. It discusses refactoring basics like typical refactorings. It also covers refactoring tools in Squeak like the Refactoring Browser. The implementation of the Refactoring Engine is explained, including how it uses an abstract syntax tree (AST) and tree rewriter. Finally, it considers the relationship between refactoring and reflection, noting that refactoring builds its own abstraction layer rather than using the system's reflective capabilities.
Reflection has proved to be a powerful feature to support the design of development environments and to extend languages. However, the granularity of structural reflection stops at the method level. This is a problem since without sub-method reflection developers have to duplicate efforts, for example to introduce transparently pluggable type-checkers or fine-grained profilers. In this paper we present Persephone, an efficient implementation of a sub-method meta-object protocol (MOP) based on AST annotations and dual methods (a compiled method and its meta-object) that reconcile AST expressiveness with bytecode execution. We validate the MOP by presenting TreeNurse, a method instrumentation framework and TypePlug, an optional, pluggable type system which is based on Persephone.
Sub-method Structural and Behavioral ReflectionMarcus Denker
This document discusses extending reflection capabilities to support unanticipated behavioral reflection. It proposes adding sub-method structure and context to reflection. Sub-method structure allows reflection at a finer granularity than methods. Context avoids infinite recursion when reflecting on the whole system. The contributions are unanticipated partial reflection, sub-method structural reflection, partial reflection using annotations, and contextual reflection.
This document outlines Marcus Denker's research, teaching, and open source involvement. It discusses his research directions in reflective systems, context oriented programming, and virtual machines. It describes his advising of students' projects and teaching of courses. It also covers his contributions to the open source Squeak Smalltalk system as the lead for version 3.9 and as a founding board member of the Squeak Foundation.
Software Evolution from the Field: an Experience ReportMarcus Denker
The document discusses challenges in evolving the Squeak programming language and outlines solutions implemented by its maintainers. It describes issues like tangled old code, dead prototypes, and an "egocentric syndrome" among developers. Solutions included deprecating methods, modularizing the codebase, adding tests, versioning tools, and bug tracking. The maintainers also hope to improve language support for modularity, treating history as first-class data, and managing changes beyond simple deprecation. The goal is enabling safe evolution of the Squeak codebase and language.
The document discusses behavioral reflection and metaprogramming techniques in Smalltalk. It introduces sub-method structures like bytecode, the ByteSurgeon library for bytecode transformation, and Geppetto which enables partial behavioral reflection through hooksets and metaobjects. This allows profiling and caching to be selectively added to applications at runtime without restarting the system. Future work includes improving tool support and integrating with AST representations.
This document discusses reflective methods as a way to provide sub-method level reflection in Smalltalk. It proposes annotating the AST with metadata to enable various tools to work with and communicate about code at a finer granularity than just methods. Reflective methods would generate bytecode on demand from an annotated persistent AST. This allows things like type information, profiler data, and debugger information to be stored as annotations and shared between tools. The document demonstrates reflective methods and annotations in Smalltalk through examples of invalidating code, asserting values, and adding type annotations to methods. It also discusses using Reflex as a way to implement partial behavioral reflection through annotating hooksets and links to metaobjects on the AST.
This document provides an overview of the Seaside web application framework. It discusses key Seaside concepts like components, control flow, composition, and more. The document contains lecture notes on Seaside, including roadmaps, explanations of concepts, code examples, and screenshots.
DDD, CQRS and testing with ASP.Net MVCAndy Butland
This document provides an overview of a presentation on Domain Driven Design (DDD), Command Query Responsibility Segregation (CQRS), and testing with ASP.Net MVC. It introduces the presenter and gives an outline of the topics to be covered, including implementing DDD with ASP.Net MVC and Entity Framework, using a mediator pattern for CQRS, and unit testing models, queries, and commands. References are given to other authors and resources that influenced the approaches and implementations discussed in the presentation.
The Command design pattern encapsulates requests as objects, allowing for the parameterization of clients with different requests, queues of requests, and undo functionality. It decouples the invoker of a request from the receiver that performs it. Some key elements are the Command interface that declares an execute method, ConcreteCommand classes that link Receivers to their actions, and an Invoker that asks Commands to carry out requests. The pattern supports adding new commands without changing existing code but can lead to many command classes cluttering the design. It is used when objects need to issue parameterized requests without coupling to receivers or timing of requests.
Container orchestration from theory to practiceDocker, Inc.
"Join Laura Frank and Stephen Day as they explain and examine technical concepts behind container orchestration systems, like distributed consensus, object models, and node topology. These concepts build the foundation of every modern orchestration system, and each technical explanation will be illustrated using SwarmKit and Kubernetes as a real-world example. Gain a deeper understanding of how orchestration systems work in practice and walk away with more insights into your production applications."
In Apache Cassandra Lunch #41: Apache Cassandra Lunch #41: Cassandra on Kubernetes - Docker/Kubernetes/Helm Part 1, we discuss Cassandra on Kubernetes and give an introduction to Docker, Kubernetes, and Helm.
Accompanying Blog: https://blog.anant.us/apache-cassandra-lunch-41-cassandra-on-kubernetes-docker-kubernetes-helm-part-1/
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How can we quickly tell what an application is about? How can we quickly tell what it does? How can we distinguish business concepts from architecture clutter? How can we quickly find the code we want to change? How can we instinctively know where to add code for new features? Purely looking at unit tests is either not possible or too painful. Looking at higher-level tests can take a long time and still not give us the answers we need. For years, we have all struggled to design and structure projects that reflect the business domain.
In this talk Sandro will be sharing how he designed the last application he worked on, twisting a few concepts from Domain-Driven Design, properly applying MVC, borrowing concepts from CQRS, and structuring packages in non-conventional ways. Sandro will also be touching on SOLID principles, Agile incremental design, modularisation, and testing. By iteratively modifying the project structure to better model the product requirements, he has come up with a design style that helps developers create maintainable and domain-oriented software.
This document discusses TypePlug, a framework for pluggable and optional types in Smalltalk/Squeak. It argues that static types can constrain expressiveness and make programs more brittle, but that pluggable types avoid these issues by making type systems optional and allowing different type systems to be plugged in. TypePlug uses sub-method reflection to allow type annotations and type checking at the sub-method level. It addresses the problem of retrofitting types to existing code through type inference and external type annotations defined separately from source code.
Building an OpenMRS Distribution - Lessons from KenyaEMRrowanseymour
1) Managing large scale OpenMRS implementations with many sites presents challenges around maintaining consistency between sites and enabling simple upgrades and maintenance.
2) One approach is to develop an OpenMRS "distribution" that defines a consistent set of components including OpenMRS version, modules, and metadata for all sites.
3) Key aspects of developing a distribution include using a "distribution module" to define required component versions, continuous integration testing, and managing metadata installation and consistency programmatically rather than relying on users.
Similar to Unanticipated Partial Behavioral Reflection (20)
Workshop: Identifying concept inventories in agile programmingESUG
This document discusses the development of a concept inventory to identify common misconceptions in agile programming and object-oriented development. The project aims to strengthen collaboration between INRIA/Lille and ÉTS/UQAM by creating a concept inventory that can be used to improve teaching of agile development with object-oriented languages like TypeScript, JavaScript, and Pharo. The methodology involves identifying misconceptions, proposing a concept inventory, and validating it in courses by measuring understanding before and after instruction. A workshop will help identify initial misconceptions in Smalltalk/Pharo by capturing them in a collaborative tool.
This document proposes integrating documentation into the Pharo language metamodel and environment to improve documentation support. It suggests making documentation first-class citizens in Pharo by providing built-in support and a minimal API, which would allow tight integration with development tools and future extensions without requiring grammar changes or large efforts. This could improve documentation quality by enabling direct references between code and documentation and automatic logging of documentation usage.
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This document outlines advances and the roadmap for debugging tools in Pharo. It discusses recent improvements to the debugging infrastructure, including architectural changes and new debugging commands. It also describes upcoming work, such as additional infrastructure improvements, an emergency debugger, support for meta-object protocols, a redesigned user experience, a remote debugger, and improved documentation. The document concludes by inviting participants to help evaluate new debugging experiments.
The document describes Sequence, a pipeline modeling and discrete event simulation framework developed in Pharo Smalltalk. Sequence allows describing system resources, building blocks that use those resources, assembling scenarios from blocks, collecting information during simulated runs, and interactively exploring system traces. The framework implements a discrete event simulation engine with event streams that model periodic processes and resources. Sequence provides tools for evaluating system performance through simulation before complete hardware is available.
Migration process from monolithic to micro frontend architecture in mobile ap...ESUG
This document discusses migrating a monolithic mobile application called CARL Touch to a micro frontend architecture. It presents a migration process involving three steps: 1) analysis of the monolithic codebase, 2) identification of potential micro frontends, and 3) transformation of the codebase to implement the identified micro frontends. Previous experiments at Berger-Levrault involving two teams migrating CARL Touch provided insights. The proposed process uses static and dynamic analysis, code visualization and clustering techniques to help identify optimal micro frontends and transform the codebase in a semi-automated manner.
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This document summarizes an analysis of the Dart programming language using tools in the Pharo environment. It describes generating a parser for Dart using SmaCC, which produces an AST. It also details defining a Famix meta-model for Dart and the Chartreuse-D importer that creates a FamixDart model from the AST. Future work is outlined, including improving SmaCCDart, continuing to develop the FamixDart meta-model, and handling dynamic types when importing associations. The goal is to analyze Dart and explore modeling Flutter applications.
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This document summarizes research on transpiling Pharo classes to JavaScript using ECMAScript 5 versus ECMAScript 6. It finds that transpiling to ES6 provides benefits like significantly faster load times, improved benchmark performance up to 43%, and more idiomatic code compared to ES5. However, fully emulating Smalltalk semantics like metaclass inheritance remains challenging when targeting JavaScript.
The document presents an approach for automated test generation from software models and execution traces. Key aspects of the approach include using metamodels to represent the codebase, values, and desired unit test structure. Models are built from the codebase and traces, then transformations are applied to generate unit tests conforming to the test metamodel. Abstract syntax trees are used to export the generated tests to code. The approach aims to generate tests that are relevant, readable and maintainable without relying on existing tests. An example demonstrates generating a JUnit test from an application class.
Genetic programming is used to generate unit tests by evolving test code via genetic algorithms to maximize coverage. Tests are represented as chromosomes of object and message statements. The genetic algorithm selects tests based on coverage, combines tests through crossover, and replaces tests in the population over generations to find optimal test sequences. Future work includes improving path exploration and comparing with other test generation tools.
Threaded-Execution and CPS Provide Smooth Switching Between Execution ModesESUG
Threaded execution and continuation-passing style (CPS) allow for smooth switching between execution modes in Zag Smalltalk. Threaded execution interprets code as a sequence of addresses like bytecode but is 2.3-4.7 times faster, while CPS passes continuations explicitly like in functional languages and is 3-5 times faster than bytecode. Both approaches allow fallback to debugging. The implementation shares context and stack between modes to easily switch with proper object structures.
Exploring GitHub Actions through EGAD: An Experience ReportESUG
This document summarizes an experience report on exploring GitHub Actions through EGAD, a tool for GitHub Action analysis. It discusses three key lessons learned: 1) Composing a story by documenting tasks and linking documentation to code, 2) Navigating custom views to conduct research, and 3) Supporting onboarding of researchers by assigning mentors, scheduling meetings, and encouraging use of resources. EGAD takes workflow YAML files, wraps them in a domain model to provide context, and allows inspecting examples to fully explore the GitHub Actions domain model.
Pharo: a reflective language A first systematic analysis of reflective APIsESUG
This document analyzes the reflective features and APIs in Pharo, a reflective programming language. It presents a catalog of Pharo's reflective APIs and analyzes how they relate to metaobjects. The analysis highlights areas for potential improvement, such as providing solutions for intercession on state reads/writes and addressing constraints when changing an object's class. The document contributes to understanding Pharo's reflective design and its evolution over time.
The document discusses garbage collector tuning for applications with pathological allocation patterns. It begins by explaining the motivation and issues caused by pathological patterns, such as applications taking over an hour and a half to run. It then provides an overview of garbage collection and how allocation patterns can impact performance. The document dives into two specific tuning techniques - increasing the full GC threshold to prevent premature full GCs from being triggered, and increasing the tenuring threshold to avoid large objects residing in the remembered set and slowing down scavenges. These tunings resulted in significant performance improvements for the sample DataFrame application, reducing the run time from over an hour and a half to around seven minutes.
Improving Performance Through Object Lifetime Profiling: the DataFrame CaseESUG
This document discusses improving garbage collection performance in Pharo through object lifetime profiling. It presents Illimani, a lifetime profiler developed for Pharo. Illimani was used to profile the lifetimes of objects created when loading a large DataFrame. The profiling revealed that most objects had short lifetimes, suggesting the garbage collector could be tuned. Tuning the garbage collector parameters based on the lifetime profiles improved the performance of loading the DataFrame.
This document discusses the past, present, and future of Pharo DataFrames. It began as a student project but has evolved into a mature project with dedicated engineers, improving performance and adding functionality. Future plans include further performance enhancements, adding more functionality, better integration with other Pharo projects, and support for big data. Evaluation of DataFrames is also planned.
This document discusses issues with thisContext in the Pharo debugger not correctly representing the execution context and being the DoIt context instead. This was fixed in Pharo12 by making thisContext a variable object that is wrapped in a DoItVariable, so the debugger context is used. When inspecting or doing DoIt, the doIt Variable is pushed and read to provide the proper execution context.
This document proposes using websockets to display fencing scores and a chronometer from an arena server to mobile phones over the internet in real-time. It includes links to video examples of a chronometer display and photos from fencing competitions.
ShowUs: PharoJS.org Develop in Pharo, Run on JavaScriptESUG
This document discusses PharoJS, which allows developers to develop applications in Pharo and then export them to run as JavaScript applications. PharoJS enables 100% of Pharo code to be executed during development, and then 100% of that same code is exported to JavaScript to be executed in production. The document also briefly mentions deployment options for exported PharoJS applications like GitHub Pages and GitHub Actions.
The document contains testimonials from participants of the Pharo MOOC praising its effectiveness at teaching object-oriented design. It also announces an upcoming advanced design MOOC that will have over 60 lectures, slides, videos and an exercise booklet. Finally, it provides links to the course websites and encourages people to stay tuned for the new MOOC.
A New Architecture Reconciling Refactorings and TransformationsESUG
This document discusses reconciling refactorings and transformations in software engineering. It proposes a new architecture where refactorings decorate transformations by checking preconditions and composing multiple transformations. Refactorings ensure transformations are applied safely while transformations focus on model changes. Open questions remain around precondition handling and composition semantics. The goals are to reduce duplication, support custom refactorings/transformations, and provide a modern driver-based user interface.
Ivanti’s Patch Tuesday breakdown goes beyond patching your applications and brings you the intelligence and guidance needed to prioritize where to focus your attention first. Catch early analysis on our Ivanti blog, then join industry expert Chris Goettl for the Patch Tuesday Webinar Event. There we’ll do a deep dive into each of the bulletins and give guidance on the risks associated with the newly-identified vulnerabilities.
Have you ever been confused by the myriad of choices offered by AWS for hosting a website or an API?
Lambda, Elastic Beanstalk, Lightsail, Amplify, S3 (and more!) can each host websites + APIs. But which one should we choose?
Which one is cheapest? Which one is fastest? Which one will scale to meet our needs?
Join me in this session as we dive into each AWS hosting service to determine which one is best for your scenario and explain why!
Full-RAG: A modern architecture for hyper-personalizationZilliz
Mike Del Balso, CEO & Co-Founder at Tecton, presents "Full RAG," a novel approach to AI recommendation systems, aiming to push beyond the limitations of traditional models through a deep integration of contextual insights and real-time data, leveraging the Retrieval-Augmented Generation architecture. This talk will outline Full RAG's potential to significantly enhance personalization, address engineering challenges such as data management and model training, and introduce data enrichment with reranking as a key solution. Attendees will gain crucial insights into the importance of hyperpersonalization in AI, the capabilities of Full RAG for advanced personalization, and strategies for managing complex data integrations for deploying cutting-edge AI solutions.
Building Production Ready Search Pipelines with Spark and MilvusZilliz
Spark is the widely used ETL tool for processing, indexing and ingesting data to serving stack for search. Milvus is the production-ready open-source vector database. In this talk we will show how to use Spark to process unstructured data to extract vector representations, and push the vectors to Milvus vector database for search serving.
Unlocking Productivity: Leveraging the Potential of Copilot in Microsoft 365, a presentation by Christoforos Vlachos, Senior Solutions Manager – Modern Workplace, Uni Systems
Taking AI to the Next Level in Manufacturing.pdfssuserfac0301
Read Taking AI to the Next Level in Manufacturing to gain insights on AI adoption in the manufacturing industry, such as:
1. How quickly AI is being implemented in manufacturing.
2. Which barriers stand in the way of AI adoption.
3. How data quality and governance form the backbone of AI.
4. Organizational processes and structures that may inhibit effective AI adoption.
6. Ideas and approaches to help build your organization's AI strategy.
Best 20 SEO Techniques To Improve Website Visibility In SERPPixlogix Infotech
Boost your website's visibility with proven SEO techniques! Our latest blog dives into essential strategies to enhance your online presence, increase traffic, and rank higher on search engines. From keyword optimization to quality content creation, learn how to make your site stand out in the crowded digital landscape. Discover actionable tips and expert insights to elevate your SEO game.
In his public lecture, Christian Timmerer provides insights into the fascinating history of video streaming, starting from its humble beginnings before YouTube to the groundbreaking technologies that now dominate platforms like Netflix and ORF ON. Timmerer also presents provocative contributions of his own that have significantly influenced the industry. He concludes by looking at future challenges and invites the audience to join in a discussion.
HCL Notes und Domino Lizenzkostenreduzierung in der Welt von DLAUpanagenda
Webinar Recording: https://www.panagenda.com/webinars/hcl-notes-und-domino-lizenzkostenreduzierung-in-der-welt-von-dlau/
DLAU und die Lizenzen nach dem CCB- und CCX-Modell sind für viele in der HCL-Community seit letztem Jahr ein heißes Thema. Als Notes- oder Domino-Kunde haben Sie vielleicht mit unerwartet hohen Benutzerzahlen und Lizenzgebühren zu kämpfen. Sie fragen sich vielleicht, wie diese neue Art der Lizenzierung funktioniert und welchen Nutzen sie Ihnen bringt. Vor allem wollen Sie sicherlich Ihr Budget einhalten und Kosten sparen, wo immer möglich. Das verstehen wir und wir möchten Ihnen dabei helfen!
Wir erklären Ihnen, wie Sie häufige Konfigurationsprobleme lösen können, die dazu führen können, dass mehr Benutzer gezählt werden als nötig, und wie Sie überflüssige oder ungenutzte Konten identifizieren und entfernen können, um Geld zu sparen. Es gibt auch einige Ansätze, die zu unnötigen Ausgaben führen können, z. B. wenn ein Personendokument anstelle eines Mail-Ins für geteilte Mailboxen verwendet wird. Wir zeigen Ihnen solche Fälle und deren Lösungen. Und natürlich erklären wir Ihnen das neue Lizenzmodell.
Nehmen Sie an diesem Webinar teil, bei dem HCL-Ambassador Marc Thomas und Gastredner Franz Walder Ihnen diese neue Welt näherbringen. Es vermittelt Ihnen die Tools und das Know-how, um den Überblick zu bewahren. Sie werden in der Lage sein, Ihre Kosten durch eine optimierte Domino-Konfiguration zu reduzieren und auch in Zukunft gering zu halten.
Diese Themen werden behandelt
- Reduzierung der Lizenzkosten durch Auffinden und Beheben von Fehlkonfigurationen und überflüssigen Konten
- Wie funktionieren CCB- und CCX-Lizenzen wirklich?
- Verstehen des DLAU-Tools und wie man es am besten nutzt
- Tipps für häufige Problembereiche, wie z. B. Team-Postfächer, Funktions-/Testbenutzer usw.
- Praxisbeispiele und Best Practices zum sofortigen Umsetzen
Let's Integrate MuleSoft RPA, COMPOSER, APM with AWS IDP along with Slackshyamraj55
Discover the seamless integration of RPA (Robotic Process Automation), COMPOSER, and APM with AWS IDP enhanced with Slack notifications. Explore how these technologies converge to streamline workflows, optimize performance, and ensure secure access, all while leveraging the power of AWS IDP and real-time communication via Slack notifications.
AI 101: An Introduction to the Basics and Impact of Artificial IntelligenceIndexBug
Imagine a world where machines not only perform tasks but also learn, adapt, and make decisions. This is the promise of Artificial Intelligence (AI), a technology that's not just enhancing our lives but revolutionizing entire industries.
UiPath Test Automation using UiPath Test Suite series, part 6DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 6. In this session, we will cover Test Automation with generative AI and Open AI.
UiPath Test Automation with generative AI and Open AI webinar offers an in-depth exploration of leveraging cutting-edge technologies for test automation within the UiPath platform. Attendees will delve into the integration of generative AI, a test automation solution, with Open AI advanced natural language processing capabilities.
Throughout the session, participants will discover how this synergy empowers testers to automate repetitive tasks, enhance testing accuracy, and expedite the software testing life cycle. Topics covered include the seamless integration process, practical use cases, and the benefits of harnessing AI-driven automation for UiPath testing initiatives. By attending this webinar, testers, and automation professionals can gain valuable insights into harnessing the power of AI to optimize their test automation workflows within the UiPath ecosystem, ultimately driving efficiency and quality in software development processes.
What will you get from this session?
1. Insights into integrating generative AI.
2. Understanding how this integration enhances test automation within the UiPath platform
3. Practical demonstrations
4. Exploration of real-world use cases illustrating the benefits of AI-driven test automation for UiPath
Topics covered:
What is generative AI
Test Automation with generative AI and Open AI.
UiPath integration with generative AI
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP