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Fast as C: How to Write Really Terrible Java
For years we’ve been told that the JVM’s amazing optimizers can take your running code and make it “fast” or “as fast as C++” or “as fast as C”…or sometimes “faster than C”. And yet we don’t often see this happen in practice, due in large part to (good and bad) development patterns that have taken hold in the Java world.
In this talk, we’ll explore the main reasons why Java code rarely runs as fast as C or C++ and how you can write really bad Java code that the JVM will do a better job of optimizing. We’ll take some popular microbenchmarks and burn them to the ground, monitoring JIT logs and assembly dumps along the way.
Morel, a Functional Query Language
Is it easier to add functional programming features to a query language, or to add query capabilities to a functional language? In Morel, we have done the latter.
Functional and query languages have much in common, and yet much to learn from each other. Functional languages have a rich type system that includes polymorphism and functions-as-values and Turing-complete expressiveness; query languages have optimization techniques that can make programs several orders of magnitude faster, and runtimes that can use thousands of nodes to execute queries over terabytes of data.
Morel is an implementation of Standard ML on the JVM, with language extensions to allow relational expressions. Its compiler can translate programs to relational algebra and, via Apache Calcite’s query optimizer, run those programs on relational backends.
In this talk, we describe the principles that drove Morel’s design, the problems that we had to solve in order to implement a hybrid functional/relational language, and how Morel can be applied to implement data-intensive systems.
(A talk given by Julian Hyde at Strange Loop 2021, St. Louis, MO, on October 1st, 2021.)
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Developer and team leader focused on improving performance and usability in Odoo. Key changes included optimizing computed fields, caches, and recomputations to reduce queries and batch operations. Multi-company support was also enhanced through new context and environment attributes to control record visibility and target company.
The Functional Programmer's Toolkit (NDC London 2019)
(slides and video at https://fsharpforfunandprofit.com/fptoolkit)
The functional programming community has a number of patterns with strange names such as monads, monoids, functors, and catamorphisms.
In this beginner-friendly talk, we'll demystify these techniques and see how they all fit together into a small but versatile "tool kit".
We'll then see how the tools in this tool kit can be applied to a wide variety of programming problems, such as handling missing data, working with lists, and implementing the functional equivalent of dependency injection.
Dts x dicoding #2 memulai pemrograman kotlin
This document provides tips and tricks for installing Kotlin programming tools and covers fundamental Kotlin concepts like data types, variables, functions, control flow structures, and loops. It discusses installing Kotlin and resolving common errors. It introduces basic Kotlin syntax for strings, numbers, Booleans, arrays, and more. It also covers if/else expressions, when expressions, enums, loops like while, for, and for-each, and break/continue functionality. The document encourages practicing exercises to continue learning Kotlin.
Recommended
Fast as C: How to Write Really Terrible Java
For years we’ve been told that the JVM’s amazing optimizers can take your running code and make it “fast” or “as fast as C++” or “as fast as C”…or sometimes “faster than C”. And yet we don’t often see this happen in practice, due in large part to (good and bad) development patterns that have taken hold in the Java world.
In this talk, we’ll explore the main reasons why Java code rarely runs as fast as C or C++ and how you can write really bad Java code that the JVM will do a better job of optimizing. We’ll take some popular microbenchmarks and burn them to the ground, monitoring JIT logs and assembly dumps along the way.
Morel, a Functional Query Language
Is it easier to add functional programming features to a query language, or to add query capabilities to a functional language? In Morel, we have done the latter.
Functional and query languages have much in common, and yet much to learn from each other. Functional languages have a rich type system that includes polymorphism and functions-as-values and Turing-complete expressiveness; query languages have optimization techniques that can make programs several orders of magnitude faster, and runtimes that can use thousands of nodes to execute queries over terabytes of data.
Morel is an implementation of Standard ML on the JVM, with language extensions to allow relational expressions. Its compiler can translate programs to relational algebra and, via Apache Calcite’s query optimizer, run those programs on relational backends.
In this talk, we describe the principles that drove Morel’s design, the problems that we had to solve in order to implement a hybrid functional/relational language, and how Morel can be applied to implement data-intensive systems.
(A talk given by Julian Hyde at Strange Loop 2021, St. Louis, MO, on October 1st, 2021.)
Impact of the New ORM on Your Modules
Developer and team leader focused on improving performance and usability in Odoo. Key changes included optimizing computed fields, caches, and recomputations to reduce queries and batch operations. Multi-company support was also enhanced through new context and environment attributes to control record visibility and target company.
The Functional Programmer's Toolkit (NDC London 2019)
(slides and video at https://fsharpforfunandprofit.com/fptoolkit)
The functional programming community has a number of patterns with strange names such as monads, monoids, functors, and catamorphisms.
In this beginner-friendly talk, we'll demystify these techniques and see how they all fit together into a small but versatile "tool kit".
We'll then see how the tools in this tool kit can be applied to a wide variety of programming problems, such as handling missing data, working with lists, and implementing the functional equivalent of dependency injection.
Dts x dicoding #2 memulai pemrograman kotlin
This document provides tips and tricks for installing Kotlin programming tools and covers fundamental Kotlin concepts like data types, variables, functions, control flow structures, and loops. It discusses installing Kotlin and resolving common errors. It introduces basic Kotlin syntax for strings, numbers, Booleans, arrays, and more. It also covers if/else expressions, when expressions, enums, loops like while, for, and for-each, and break/continue functionality. The document encourages practicing exercises to continue learning Kotlin.
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MySQL 8 introduces support for ANSI SQL recursive queries with common table expressions, a powerful method for working with recursive data references. Until now, MySQL application developers have had to use workarounds for hierarchical data relationships. It's time to write SQL queries in a more standardized way, and be compatible with other brands of SQL implementations. But as always, the bottom line is: how does it perform? This presentation will briefly describe how to use recursive queries, and then test the performance and scalability of those queries against other solutions for hierarchical queries.
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We are all familiar with example-based testing, as typified by TDD and BDD, where each test is hand-crafted.
But there's another approach to writing tests. In the "property-based testing" approach, a single test is run hundreds of times with randomly generated inputs. Property-based testing is a great way to find edge cases, and also helps you to understand and document the behavior of your code under all conditions.
This talk will introduce property-based testing, show you how it works, and demonstrate why you should consider adding this powerful technique to your toolbelt.
자바에서 null을 안전하게 다루는 방법
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Microservices-DDD-Telosys-Devoxx-FR-2022
Conférence Devoxx FR 2022
"Microservices, DDD et bootstrapping pour faire un départ lancé"
Résumé de la présentation :
Associer microservices et conception DDD (Domain-Driven Design) semble une évidence. Le découpage en contextes et les différentes couches d’architecture constituent un cadre séduisant pour bâtir des microservices avec une structure stéréotypée. Mais si on souhaite respecter les fondamentaux du DDD et garantir l’isolation des différentes couches on arrive rapidement à une structure de projet basée sur plusieurs modules qui peuvent devenir complexes à gérer et qui risquent de ralentir le cycle de développement, en particulier lors de la phase de démarrage.
Cette présentation est un retour d’expérience d’un grand projet dans lequel le générateur de code Telosys a été utilisé pour automatiser la phase d’amorçage de chaque microservice.
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Applied category theory: the emerging science of compositionality
What do programming, quantum physics, chemistry, neuroscience, systems biology, natural language parsing, causality, network theory, game theory, dynamical systems and database theory have in common?
As functional programmers, we know how useful category theory can be for our work - or perhaps how abstruse and distant it can seem. What is less well known is that applying category theory to the real world is an exciting field of study that has really taken off in just the last few years. It turns out that we share something big with other fields and industries - we want to make big things out of little things without everything going to hell! The key is compositionality, the central idea of category theory.
This talk will introduce the emerging field of applied category theory, with the aims of:
- Giving attendees a broad overview of cutting-edge applications of category theory
- Building an understanding of a small number of the most important core concepts
- Getting attendees excited, inspired to learn more, and equipped to apply some basic concepts to their work
Railway Oriented Programming
(Video of these slides here http://fsharpforfunandprofit.com/rop)
(My response to "this is just Either" here: http://fsharpforfunandprofit.com/rop/#monads)
Many examples in functional programming assume that you are always on the "happy path". But to create a robust real world application you must deal with validation, logging, network and service errors, and other annoyances.
So, how do you handle all this in a clean functional way? This talk will provide a brief introduction to this topic, using a fun and easy-to-understand railway analogy.
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This document summarizes a presentation about OAuth 2.0, OpenID Connect, and single sign-on (SSO) using IdentityServer4. It discusses the differences between authorization and authentication, provides an overview of OAuth 2.0 authorization grant types and how IdentityServer4 can implement OAuth 2.0 and OpenID Connect protocols to secure APIs, web, and mobile applications. It also lists some demos and helpful links related to implementing OAuth 2.0 and OpenID Connect with IdentityServer4.
Speed Up Your APEX Apps with JSON and Handlebars
The document discusses various methods for generating JSON from SQL queries in Oracle APEX applications. It compares manually concatenating strings, using the apex_util.json_from_* procedures, the PL/JSON library, the APEX_JSON API package, and Oracle REST Data Services (ORDS). The APEX_JSON package is recommended for most cases as it supports generation and parsing, can be used standalone, has a light footprint, and makes conversion from XML easy. Using a templating engine like Handlebars.js with JSON is also presented as a way to dynamically render HTML from database queries.
JSON Array Indexes in MySQL
MySQL 8.0.17 has the ability to create indexes over JSON arrays to speed up your queries. This presentation shows examples and explain all you need to know about this new feature: How are array indexes created? How do they work? When are they used? Are there any limitations?
서버 개발자가 바라 본 Functional Reactive Programming with RxJava - SpringCamp2015
youtube : https://youtu.be/E_Bgv9upahI
비동기 이벤트 기반의 라이브러리로만 생각 했던 RxJava가 지금 이 시대 프로그래머에게 닥쳐 올 커다란 메시지라는 사실을 알게 된 지금. 현장에서 직접 느낀 RxJava의 본질인 Function Reactive Programming(FRP)에 대해 우리가 잘 아는 Java 이야기로 풀어 보고 ReactiveX(RxJava) 개발을 위한 서버 환경에 대한 이해와 SpringFramework, Netty에서의 RxJava를 어떻게 이용 하고 개발 했는지 공유 하고자 합니다.
Dts x dicoding #1 memulai pemrograman kotlin
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Sql Injection Myths and Fallacies
The most massive crime of identity theft in history was perpetrated in 2007 by exploiting an SQL Injection vulnerability. This issue is one of the most common and most serious threats to web application security. In this presentation, you'll see some common myths busted and you'll get a better understanding of defending against SQL injection.
Modul Praktek Java OOP
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Cryptography 101 provides an introduction to basic cryptography concepts such as hashing, symmetric encryption, asymmetric encryption, and digital signatures. It explains how these concepts are implemented in Java using APIs like the Java Cryptography Architecture (JCA) and Java Cryptography Extension (JCE). Code examples are provided to demonstrate generating keys, encrypting/decrypting data, signing/verifying signatures, and more. The document aims to provide developers with a basic understanding of cryptographic techniques and how they are applied in Java.
MongoDB .local Toronto 2019: MongoDB Atlas Search Deep Dive
Come and hear more about our new full-text search operator for MongoDB Atlas. This is a significant enhancement to MongoDB search features and is the easiest and most powerful full-text search solution for databases on MongoDB Atlas.
This talk is important for anyone who has implemented search or is considering a search feature in their MongoDB application.
You will see a demo of $searchBeta, learn about how it works, discover specific features to help you deliver relevant search results, and learn how you can start using full-text search in your application today.
JSON WEB TOKEN
The document discusses JSON Web Tokens (JWT), including how they work and how they provide authorization. It explains that JWTs contain encoded JSON objects with a header, payload, and signature. The payload contains claims about the user's identity. JWTs can be used instead of session tokens to authorize API requests since they allow stateless authentication by including all necessary information in the token itself. The document also discusses potential security issues with JWTs and when they are an appropriate authorization mechanism.
Charles
An introduction to the Charles Debugging Proxy. This presentation was given at Melbourne Web Developers' Meetup on July 25, 2012.
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Recursive Query Throwdown
MySQL 8 introduces support for ANSI SQL recursive queries with common table expressions, a powerful method for working with recursive data references. Until now, MySQL application developers have had to use workarounds for hierarchical data relationships. It's time to write SQL queries in a more standardized way, and be compatible with other brands of SQL implementations. But as always, the bottom line is: how does it perform? This presentation will briefly describe how to use recursive queries, and then test the performance and scalability of those queries against other solutions for hierarchical queries.
A2Z gift shop
This document outlines an online gift shop project for A2Z Gift Shop that was developed using Visual Basic 2010 and SQL Server to allow customers to purchase products and view product information online
The lazy programmer's guide to writing thousands of tests
We are all familiar with example-based testing, as typified by TDD and BDD, where each test is hand-crafted.
But there's another approach to writing tests. In the "property-based testing" approach, a single test is run hundreds of times with randomly generated inputs. Property-based testing is a great way to find edge cases, and also helps you to understand and document the behavior of your code under all conditions.
This talk will introduce property-based testing, show you how it works, and demonstrate why you should consider adding this powerful technique to your toolbelt.
자바에서 null을 안전하게 다루는 방법
여러 언어에서 null 안전성을 주요 마케팅 쟁점으로 내세우면서 null 안전성이 관심을 많이 받고 있습니다.
자바에서도 null을 잘 다루어야 소프트웨어 결함을 줄이고 견고하게 만들 수 있는데 null의 위협에서 코드를 안전하게 지키는 설계 지침을 정리하고 안전하다고 확인하는데 도움이 되는 도구를 소개합니다.
Microservices-DDD-Telosys-Devoxx-FR-2022
Conférence Devoxx FR 2022
"Microservices, DDD et bootstrapping pour faire un départ lancé"
Résumé de la présentation :
Associer microservices et conception DDD (Domain-Driven Design) semble une évidence. Le découpage en contextes et les différentes couches d’architecture constituent un cadre séduisant pour bâtir des microservices avec une structure stéréotypée. Mais si on souhaite respecter les fondamentaux du DDD et garantir l’isolation des différentes couches on arrive rapidement à une structure de projet basée sur plusieurs modules qui peuvent devenir complexes à gérer et qui risquent de ralentir le cycle de développement, en particulier lors de la phase de démarrage.
Cette présentation est un retour d’expérience d’un grand projet dans lequel le générateur de code Telosys a été utilisé pour automatiser la phase d’amorçage de chaque microservice.
Environnement technique : Java, SpringBoot, Telosys
Applied category theory: the emerging science of compositionality
What do programming, quantum physics, chemistry, neuroscience, systems biology, natural language parsing, causality, network theory, game theory, dynamical systems and database theory have in common?
As functional programmers, we know how useful category theory can be for our work - or perhaps how abstruse and distant it can seem. What is less well known is that applying category theory to the real world is an exciting field of study that has really taken off in just the last few years. It turns out that we share something big with other fields and industries - we want to make big things out of little things without everything going to hell! The key is compositionality, the central idea of category theory.
This talk will introduce the emerging field of applied category theory, with the aims of:
- Giving attendees a broad overview of cutting-edge applications of category theory
- Building an understanding of a small number of the most important core concepts
- Getting attendees excited, inspired to learn more, and equipped to apply some basic concepts to their work
Railway Oriented Programming
(Video of these slides here http://fsharpforfunandprofit.com/rop)
(My response to "this is just Either" here: http://fsharpforfunandprofit.com/rop/#monads)
Many examples in functional programming assume that you are always on the "happy path". But to create a robust real world application you must deal with validation, logging, network and service errors, and other annoyances.
So, how do you handle all this in a clean functional way? This talk will provide a brief introduction to this topic, using a fun and easy-to-understand railway analogy.
Authorization and Authentication using IdentityServer4
This document summarizes a presentation about OAuth 2.0, OpenID Connect, and single sign-on (SSO) using IdentityServer4. It discusses the differences between authorization and authentication, provides an overview of OAuth 2.0 authorization grant types and how IdentityServer4 can implement OAuth 2.0 and OpenID Connect protocols to secure APIs, web, and mobile applications. It also lists some demos and helpful links related to implementing OAuth 2.0 and OpenID Connect with IdentityServer4.
Speed Up Your APEX Apps with JSON and Handlebars
The document discusses various methods for generating JSON from SQL queries in Oracle APEX applications. It compares manually concatenating strings, using the apex_util.json_from_* procedures, the PL/JSON library, the APEX_JSON API package, and Oracle REST Data Services (ORDS). The APEX_JSON package is recommended for most cases as it supports generation and parsing, can be used standalone, has a light footprint, and makes conversion from XML easy. Using a templating engine like Handlebars.js with JSON is also presented as a way to dynamically render HTML from database queries.
JSON Array Indexes in MySQL
MySQL 8.0.17 has the ability to create indexes over JSON arrays to speed up your queries. This presentation shows examples and explain all you need to know about this new feature: How are array indexes created? How do they work? When are they used? Are there any limitations?
서버 개발자가 바라 본 Functional Reactive Programming with RxJava - SpringCamp2015
youtube : https://youtu.be/E_Bgv9upahI
비동기 이벤트 기반의 라이브러리로만 생각 했던 RxJava가 지금 이 시대 프로그래머에게 닥쳐 올 커다란 메시지라는 사실을 알게 된 지금. 현장에서 직접 느낀 RxJava의 본질인 Function Reactive Programming(FRP)에 대해 우리가 잘 아는 Java 이야기로 풀어 보고 ReactiveX(RxJava) 개발을 위한 서버 환경에 대한 이해와 SpringFramework, Netty에서의 RxJava를 어떻게 이용 하고 개발 했는지 공유 하고자 합니다.
Dts x dicoding #1 memulai pemrograman kotlin
Dokumen tersebut membahas tentang pembelajaran dasar bahasa pemrograman Kotlin, mulai dari sejarah, karakteristik, dan cara instalasi lingkungan pengembangannya. Kotlin adalah bahasa pemrograman multiplatform dan multiparadigma yang dikembangkan oleh JetBrains dan didukung oleh Google untuk pengembangan aplikasi Android."
Sql Injection Myths and Fallacies
The most massive crime of identity theft in history was perpetrated in 2007 by exploiting an SQL Injection vulnerability. This issue is one of the most common and most serious threats to web application security. In this presentation, you'll see some common myths busted and you'll get a better understanding of defending against SQL injection.
Modul Praktek Java OOP
Modul untuk Praktikum Pengolahan Database di Java dengan menggunakan konsep OOP Mata Pelajaran Pemrograman Internet dengan Java-JSP SMK Telkom Sandhy Putra Malang
Cryptography 101 for Java Developers - JavaZone2019
Cryptography 101 provides an introduction to basic cryptography concepts such as hashing, symmetric encryption, asymmetric encryption, and digital signatures. It explains how these concepts are implemented in Java using APIs like the Java Cryptography Architecture (JCA) and Java Cryptography Extension (JCE). Code examples are provided to demonstrate generating keys, encrypting/decrypting data, signing/verifying signatures, and more. The document aims to provide developers with a basic understanding of cryptographic techniques and how they are applied in Java.
MongoDB .local Toronto 2019: MongoDB Atlas Search Deep Dive
Come and hear more about our new full-text search operator for MongoDB Atlas. This is a significant enhancement to MongoDB search features and is the easiest and most powerful full-text search solution for databases on MongoDB Atlas.
This talk is important for anyone who has implemented search or is considering a search feature in their MongoDB application.
You will see a demo of $searchBeta, learn about how it works, discover specific features to help you deliver relevant search results, and learn how you can start using full-text search in your application today.
JSON WEB TOKEN
The document discusses JSON Web Tokens (JWT), including how they work and how they provide authorization. It explains that JWTs contain encoded JSON objects with a header, payload, and signature. The payload contains claims about the user's identity. JWTs can be used instead of session tokens to authorize API requests since they allow stateless authentication by including all necessary information in the token itself. The document also discusses potential security issues with JWTs and when they are an appropriate authorization mechanism.
Charles
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The lazy programmer's guide to writing thousands of tests
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Authorization and Authentication using IdentityServer4
서버 개발자가 바라 본 Functional Reactive Programming with RxJava - SpringCamp2015
서버 개발자가 바라 본 Functional Reactive Programming with RxJava - SpringCamp2015
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Cryptography 101 for Java Developers - JavaZone2019
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MongoDB .local Toronto 2019: MongoDB Atlas Search Deep Dive
채팅프로그램
- 1. Team FK5D) 김찬호(Team Leader) 김순환, 이성한, 박준규, 강인석 Together
- 2. • 목차 • 개발과정(Development STEP)
- 3. 톡 투게더 기본 구조
- 5. 5 | 42 ` Success ! Sign Up Login Success [My page]
- 6. Profile 6 | 42 ` Chatting Add friends 01025454545 [My page]
- 7. 데이터베이스 구조
- 8. DataBase 구조 외래 키(Foreign Key) 유일 키(Primary Key)
- 10. Profile 10 | 42 서버 소켓 생성 클라이언트 접속 요청 데이터 서버 측의 소켓을 생성 기능
- 11. Profile 11 | 42 유지보수성
- 12. Profile 12 | 42 DB와 연동시켜 Member table의 Phone 컬럼에 동일한 핸드폰 번호가 있을 경우에 로그인을 허가, 동일한 핸드폰 번호가 없을 경우 혹은 비밀번호가 다 를 경우 “해당 유저가 이미 접속 중입니다“ 메시지 로드.
- 13. Profile 13 | 42 이름 핸드폰 번호 비밀번호 이메일 Member Table
- 14. Profile 14 | 42 메인 패널 상단 패널에 친구 정보를 담아 패널을 추가
- 15. Profile 15 | 42 친구추가를 진행하였을 때, 핸드폰 번호로 멤버 테이 블 DB를 검색하여 나온 결과값을 프렌드 테이블 DB에 FK 로 주어 입력. 내 친구 목록은 서버 작동을 종료시켜도 DB에 남아 로그인 할 때 불러오도록 함.
- 16. 친구 삭제 프렌드 테이블(Friend table) 로우(Row) Profile 16 | 42
- 17. Profile 17 | 42 친구 추가 후, 친구 패널 체크박스를 클릭. “채팅하기” 버튼 을 누르면 상대 유저와 사용자 화면에 각각 채팅 화면이 오픈된 다. 하단 텍스트 필드에 글을 작성하고 확인을 누르면(엔터도 가능) 상대와 함께 채팅을 할 수 있다. 하단의 지우개를 누르 면 채팅창을 초기화해준다..