The document discusses three methods for importing SQL scripts using Hibernate:
1. Specify the import file in hibernate.cfg.xml using the classpath location
2. Directly specify the file path to import.sql
3. Implement a listener to convert the SQL file to the proper encoding on application startup
Everything you wanted to know about Stack Traces and Heap DumpsAndrei Pangin
Stack traces and heap dumps are not just debugging tools; they open a doorway to the very heart of the Java Virtual Machine. This session is focused on peculiarities of JDK somehow related to heap walking and thread stacks.
• How to create dump in production without side effects?
• What is the performance impact of stack traces?
• How do jmap and jstack work under the hood, and what is special about 'forced' mode?
• Why do all profilers lie, and how to deal with it?
• How to scan heap using JVMTI?
The presentation supported by the live demos will address all these questions. It will also introduce new Java 9 Stack-Walking API (JEP 259) and reveal some useful but little known features of HotSpot JVM.
There is hardly a Senior Java developer who has never heard of sun.misc.Unsafe. Though it has always been a private API intended for JDK internal use only, the popularity of Unsafe has grown too fast, and now it is used in many open-source projects. OK.RU is not an exception: its software also heavily relies on Unsafe APIs.
During this session we'll try to understand what is so attractive about Unsafe. Why do people keep using it regardless the warnings of removal from future JDK releases? Are there any safe alternatives to private API or is it absolutely vital? We will review the typical cases when Java developers prefer to go unsafe and discuss major benefits and the drawbacks of it. The report will be supported by the real examples from OK.RU experience.
Twisted is an event-driven networking engine written in Python. It provides tools for developing asynchronous network applications and services. Some key features of Twisted include an asynchronous reactor framework, support for deferreds/promises, common network protocols and services implemented, and application framework for building services.
Down to Stack Traces, up from Heap DumpsAndrei Pangin
Глубже стек-трейсов, шире хип-дампов
Stack trace и heap dump - не просто инструменты отладки; это потайные дверцы к самым недрам виртуальной Java машины. Доклад будет посвящён малоизвестным особенностям JDK, так или иначе связанным с обоходом хипа и стеками потоков.
Мы разберём:
- как снимать дампы в продакшне без побочных эффектов;
- как работают утилиты jmap и jstack изнутри, и в чём хитрость forced режима;
- почему все профилировщики врут, и как с этим бороться;
- познакомимся с новым Stack-Walking API в Java 9;
- научимся сканировать Heap средствами JVMTI;
- узнаем о недокументированных функциях Хотспота и других интересных штуках.
This document discusses Fork/Join framework in Java 7. It explains that Fork/Join is designed to maximize usage of multiple processors by recursively splitting large tasks into smaller subtasks. It uses work-stealing algorithm where idle workers can steal tasks from busy workers' queues to balance load. An example of calculating Fibonacci numbers using Fork/Join is provided where the task is split recursively until the subproblem size is smaller than threshold, at which point it is computed directly.
Spock is a testing and specification framework for Java and Groovy applications. It allows writing tests in a business-readable style using specifications with setup, expect, when, then blocks. Tests are highly readable and maintainable. Spock supports mocking collaborators, defining mock behavior and interactions, parameterizing tests, and extending tests with annotations. It provides a highly logical way to write well-described and concise tests.
This document summarizes new features introduced in Java 7 and 8. In Java 7, key additions included underscores in numeric literals to improve readability, using strings in switch statements, the diamond operator to reduce generics syntax, multi-catch exception handling, and try-with-resources to automatically close resources. Java 8 focused on lambda expressions to concisely represent interfaces, default methods to add interface methods without breaking existing implementations, and method references to reference methods without executing them.
The document discusses three methods for importing SQL scripts using Hibernate:
1. Specify the import file in hibernate.cfg.xml using the classpath location
2. Directly specify the file path to import.sql
3. Implement a listener to convert the SQL file to the proper encoding on application startup
Everything you wanted to know about Stack Traces and Heap DumpsAndrei Pangin
Stack traces and heap dumps are not just debugging tools; they open a doorway to the very heart of the Java Virtual Machine. This session is focused on peculiarities of JDK somehow related to heap walking and thread stacks.
• How to create dump in production without side effects?
• What is the performance impact of stack traces?
• How do jmap and jstack work under the hood, and what is special about 'forced' mode?
• Why do all profilers lie, and how to deal with it?
• How to scan heap using JVMTI?
The presentation supported by the live demos will address all these questions. It will also introduce new Java 9 Stack-Walking API (JEP 259) and reveal some useful but little known features of HotSpot JVM.
There is hardly a Senior Java developer who has never heard of sun.misc.Unsafe. Though it has always been a private API intended for JDK internal use only, the popularity of Unsafe has grown too fast, and now it is used in many open-source projects. OK.RU is not an exception: its software also heavily relies on Unsafe APIs.
During this session we'll try to understand what is so attractive about Unsafe. Why do people keep using it regardless the warnings of removal from future JDK releases? Are there any safe alternatives to private API or is it absolutely vital? We will review the typical cases when Java developers prefer to go unsafe and discuss major benefits and the drawbacks of it. The report will be supported by the real examples from OK.RU experience.
Twisted is an event-driven networking engine written in Python. It provides tools for developing asynchronous network applications and services. Some key features of Twisted include an asynchronous reactor framework, support for deferreds/promises, common network protocols and services implemented, and application framework for building services.
Down to Stack Traces, up from Heap DumpsAndrei Pangin
Глубже стек-трейсов, шире хип-дампов
Stack trace и heap dump - не просто инструменты отладки; это потайные дверцы к самым недрам виртуальной Java машины. Доклад будет посвящён малоизвестным особенностям JDK, так или иначе связанным с обоходом хипа и стеками потоков.
Мы разберём:
- как снимать дампы в продакшне без побочных эффектов;
- как работают утилиты jmap и jstack изнутри, и в чём хитрость forced режима;
- почему все профилировщики врут, и как с этим бороться;
- познакомимся с новым Stack-Walking API в Java 9;
- научимся сканировать Heap средствами JVMTI;
- узнаем о недокументированных функциях Хотспота и других интересных штуках.
This document discusses Fork/Join framework in Java 7. It explains that Fork/Join is designed to maximize usage of multiple processors by recursively splitting large tasks into smaller subtasks. It uses work-stealing algorithm where idle workers can steal tasks from busy workers' queues to balance load. An example of calculating Fibonacci numbers using Fork/Join is provided where the task is split recursively until the subproblem size is smaller than threshold, at which point it is computed directly.
Spock is a testing and specification framework for Java and Groovy applications. It allows writing tests in a business-readable style using specifications with setup, expect, when, then blocks. Tests are highly readable and maintainable. Spock supports mocking collaborators, defining mock behavior and interactions, parameterizing tests, and extending tests with annotations. It provides a highly logical way to write well-described and concise tests.
This document summarizes new features introduced in Java 7 and 8. In Java 7, key additions included underscores in numeric literals to improve readability, using strings in switch statements, the diamond operator to reduce generics syntax, multi-catch exception handling, and try-with-resources to automatically close resources. Java 8 focused on lambda expressions to concisely represent interfaces, default methods to add interface methods without breaking existing implementations, and method references to reference methods without executing them.
The document discusses Groovy, a dynamic language for the Java Virtual Machine. It has features from Python, Ruby, and Smalltalk, but uses Java-like syntax. Examples show Hello World programs in Java and Groovy. Later sections discuss Grails, a web framework for Groovy, and G*Magazine, a publication about Groovy. The document contains code samples for defining a Book domain class in Grails, implementing services with Spring Security annotations, writing Spock specifications, and Geb tests using the Page Object pattern.
This document provides an overview of new features in NIO 2 and asynchronous I/O in Java. It discusses buffers, channels, selectors, file system APIs, file change notification, and asynchronous operations using futures and completion handlers. The key aspects covered include non-blocking I/O, readiness selection, file locking, memory mapping, and file attributes.
ok.ru is one of top 10 internet sites of the World, according to similarweb.com. Under the hood, it has several thousand servers. Each of those servers own only fraction of the data or business logic. Shared nothing architecture can be hardly applied to social network, due to its nature, so a lot of communication happens between these servers, diverse in kind and volume. This makes ok.ru one of the largest, complicated, yet highly loaded distributed systems in the world.
This talk is about our experience in building always available, resilient to failures distributed systems in Java, their basic and not so basic failure and recovery scenarios, methods of failure testing and diagnostics. We’ll also discuss on possible disasters and how to prevent or get over them.
- Java NIO provides non-blocking and asynchronous network input/output that can help address performance issues with Java IO such as blocking behavior and thread overhead.
- Key aspects of Java NIO include direct buffers to reduce copying, channel-based IO to support scatter/gather operations, and selectors for asynchronous non-blocking IO across multiple channels.
- Channels in Java NIO support operations like file IO, socket IO and transferring data between channels, while buffers are used to store and move data for channels in direct memory without copying.
The document outlines the content of a Java threading module which includes processes, threads, creating threads using the Thread class and Runnable interface, thread priority, and network server thread programming. It provides code examples of defining and starting threads using both Thread and Runnable, setting thread priority, and creating a multi-threaded network server using threads to handle client connections and requests.
Java 7 Launch Event at LyonJUG, Lyon France. Fork / Join framework and Projec...julien.ponge
The document discusses new features in Java SE 7 including the Fork/Join framework for parallel programming, language evolutions through Project Coin such as try-with-resources statements, and diamond syntax for generic types which simplifies generic class instance creation. It also covers varargs syntax simplification and restrictions on using diamond syntax with anonymous inner classes.
This document summarizes new features and enhancements in Java 7 including Project Coin, NIO.2, invokedynamic, Fork/Join framework, and concurrency utilities. It discusses how these features make threads, parallelism, and concurrency easier to work with in Java. Code examples are provided to illustrate the use of ForkJoinPool, Callable, and try-with-resources statements.
NancyFX is a lightweight web framework for .NET. It emphasizes convention over configuration, testability, and customizability. Nancy modules handle requests and responses. The framework uses pipelines to run code before, after, and on errors. Dependency injection can be configured to resolve dependencies. Routing and model binding are supported. Views can be rendered from code or partial views. Authentication and authorization can be added. NancyFX aims to have minimal overhead and be easy to get started with while running on .NET Core.
The document describes a network programming report on a Java chat application. It includes the code for a Server class that implements a threaded server to handle multiple client connections simultaneously. The server opens a port to listen for clients and spins up a new thread for each accepted connection. It then reads and writes data between the server and client over buffered input/output streams. The report notes issues with messages from one client not being visible to others and connection errors that can occur between the client and server.
sizeof(Object): how much memory objects take on JVMs and when this may matterDawid Weiss
The object header contains metadata such as the identity hash, mark, and klass. Hexdumping the memory of a simple object before and after getting the identity hash shows the hash being written to the header. On 64-bit JVMs, the header is 8 bytes, containing unused space, hash, and mark fields. On 32-bit JVMs, the header is 4 bytes, with the hash overwriting unused space after being set.
An introduction on testing Node.js code.
Covers frontend (UI) testing, backend unit tests and code coverage.
Also mentions how to use a Makefile to run frontend and backend tests at the same time.
The document contains code for a client-server chat application written in Java. It defines classes for the client, server, and thread handling client connections. The client and server classes establish sockets to communicate. The server accepts new connections in a loop, passing each to a ServerThread class that handles the communication with that client using input/output streams. The client also uses input/output streams to continuously send user input to the server and receive responses, allowing for a back-and-forth chat.
The document describes a Java program that implements a chat server and client. It includes classes for the server and client frames, with methods for network connections and message handling. The server is capable of accepting multiple simultaneous client connections and running them in separate threads. Methods are provided for tasks like initializing GUI components, sending and receiving messages, and disconnecting clients.
Many projects use at least some of them - the Jakarta Commons libraries. Small reusable libraries simplifying the day-to-day work of thousands of java programmers. But over time the jakarta commons project has grown and the number of components makes it harder and harder to keep track. This session will try to give an overview of the components available and how the Jakarta Commons community is organized.
No dark magic - Byte code engineering in the real worldtcurdt
The document discusses how Java bytecode is executed on a Java Virtual Machine (JVM) and compares the steps of compiling and running a "Hello World" Java program across different platforms and tools. It also summarizes several bytecode manipulation libraries and frameworks and provides examples of how they can be used for tasks like analysis, modification, and runtime weaving of aspects.
Back to the future with Java 7 (Geekout June/2011)Martijn Verburg
This document provides a summary of Martijn Verburg's presentation titled "Back to the Future with Java 7". The presentation covered several new features in Java 7 including Project Coin additions like strings in switch statements, try-with-resources, and diamond syntax. It also discussed NIO.2 improvements to I/O, invokedynamic, Fork/Join framework, and method handles. The presentation noted that while Java the language has been quiet, the community and platform have grown. It predicted the Java SE future looks stable while JEE and Java ME futures are less certain. The document closed with discussions on the Oracle v. Google lawsuit and the future of JavaFX.
Clojure is a LISP-like programming language that runs on the Java Virtual Machine. It was created in 2007 by Rich Hickey and is currently at version 1.1. Clojure is a functional, immutable, and concurrency-oriented language. It features LISP syntax, macros, immutability, functional programming, and easy interoperability with Java. Data structures in Clojure are code, allowing homoiconicity. Clojure also supports lazy sequences, STM-based concurrency without locks, and dynamic behavior via its REPL.
ROracle is an R package that enables connectivity to Oracle Database, allowing users to execute SQL statements from R and interface with Oracle databases. It provides a high-performance Oracle driver based on OCI. ROracle reads and writes data between R and Oracle databases much faster than other R database connectors. It is open source and available on CRAN.
Surgeons are major contributors to the opioid epidemic as they commonly prescribe opioids in the perioperative period. There are no guidelines for outpatient opioid prescribing by surgeons. The Michigan Opioid Prescription Engagement Network aims to address this issue through education of surgeons, measurement of prescribing practices, driving improvement, and community engagement. The goal is to minimize excess opioid prescribing while maintaining adequate pain management, especially for those at high risk of prolonged use.
This quick start guide summarizes how to set up and use the Yealink CP860 IP conference phone. It includes unpacking contents, connecting the phone to the network and power, and instructions for basic call features like placing and answering calls. The guide also provides details on accessing the phone's web user interface and configuring account settings.
The document discusses Groovy, a dynamic language for the Java Virtual Machine. It has features from Python, Ruby, and Smalltalk, but uses Java-like syntax. Examples show Hello World programs in Java and Groovy. Later sections discuss Grails, a web framework for Groovy, and G*Magazine, a publication about Groovy. The document contains code samples for defining a Book domain class in Grails, implementing services with Spring Security annotations, writing Spock specifications, and Geb tests using the Page Object pattern.
This document provides an overview of new features in NIO 2 and asynchronous I/O in Java. It discusses buffers, channels, selectors, file system APIs, file change notification, and asynchronous operations using futures and completion handlers. The key aspects covered include non-blocking I/O, readiness selection, file locking, memory mapping, and file attributes.
ok.ru is one of top 10 internet sites of the World, according to similarweb.com. Under the hood, it has several thousand servers. Each of those servers own only fraction of the data or business logic. Shared nothing architecture can be hardly applied to social network, due to its nature, so a lot of communication happens between these servers, diverse in kind and volume. This makes ok.ru one of the largest, complicated, yet highly loaded distributed systems in the world.
This talk is about our experience in building always available, resilient to failures distributed systems in Java, their basic and not so basic failure and recovery scenarios, methods of failure testing and diagnostics. We’ll also discuss on possible disasters and how to prevent or get over them.
- Java NIO provides non-blocking and asynchronous network input/output that can help address performance issues with Java IO such as blocking behavior and thread overhead.
- Key aspects of Java NIO include direct buffers to reduce copying, channel-based IO to support scatter/gather operations, and selectors for asynchronous non-blocking IO across multiple channels.
- Channels in Java NIO support operations like file IO, socket IO and transferring data between channels, while buffers are used to store and move data for channels in direct memory without copying.
The document outlines the content of a Java threading module which includes processes, threads, creating threads using the Thread class and Runnable interface, thread priority, and network server thread programming. It provides code examples of defining and starting threads using both Thread and Runnable, setting thread priority, and creating a multi-threaded network server using threads to handle client connections and requests.
Java 7 Launch Event at LyonJUG, Lyon France. Fork / Join framework and Projec...julien.ponge
The document discusses new features in Java SE 7 including the Fork/Join framework for parallel programming, language evolutions through Project Coin such as try-with-resources statements, and diamond syntax for generic types which simplifies generic class instance creation. It also covers varargs syntax simplification and restrictions on using diamond syntax with anonymous inner classes.
This document summarizes new features and enhancements in Java 7 including Project Coin, NIO.2, invokedynamic, Fork/Join framework, and concurrency utilities. It discusses how these features make threads, parallelism, and concurrency easier to work with in Java. Code examples are provided to illustrate the use of ForkJoinPool, Callable, and try-with-resources statements.
NancyFX is a lightweight web framework for .NET. It emphasizes convention over configuration, testability, and customizability. Nancy modules handle requests and responses. The framework uses pipelines to run code before, after, and on errors. Dependency injection can be configured to resolve dependencies. Routing and model binding are supported. Views can be rendered from code or partial views. Authentication and authorization can be added. NancyFX aims to have minimal overhead and be easy to get started with while running on .NET Core.
The document describes a network programming report on a Java chat application. It includes the code for a Server class that implements a threaded server to handle multiple client connections simultaneously. The server opens a port to listen for clients and spins up a new thread for each accepted connection. It then reads and writes data between the server and client over buffered input/output streams. The report notes issues with messages from one client not being visible to others and connection errors that can occur between the client and server.
sizeof(Object): how much memory objects take on JVMs and when this may matterDawid Weiss
The object header contains metadata such as the identity hash, mark, and klass. Hexdumping the memory of a simple object before and after getting the identity hash shows the hash being written to the header. On 64-bit JVMs, the header is 8 bytes, containing unused space, hash, and mark fields. On 32-bit JVMs, the header is 4 bytes, with the hash overwriting unused space after being set.
An introduction on testing Node.js code.
Covers frontend (UI) testing, backend unit tests and code coverage.
Also mentions how to use a Makefile to run frontend and backend tests at the same time.
The document contains code for a client-server chat application written in Java. It defines classes for the client, server, and thread handling client connections. The client and server classes establish sockets to communicate. The server accepts new connections in a loop, passing each to a ServerThread class that handles the communication with that client using input/output streams. The client also uses input/output streams to continuously send user input to the server and receive responses, allowing for a back-and-forth chat.
The document describes a Java program that implements a chat server and client. It includes classes for the server and client frames, with methods for network connections and message handling. The server is capable of accepting multiple simultaneous client connections and running them in separate threads. Methods are provided for tasks like initializing GUI components, sending and receiving messages, and disconnecting clients.
Many projects use at least some of them - the Jakarta Commons libraries. Small reusable libraries simplifying the day-to-day work of thousands of java programmers. But over time the jakarta commons project has grown and the number of components makes it harder and harder to keep track. This session will try to give an overview of the components available and how the Jakarta Commons community is organized.
No dark magic - Byte code engineering in the real worldtcurdt
The document discusses how Java bytecode is executed on a Java Virtual Machine (JVM) and compares the steps of compiling and running a "Hello World" Java program across different platforms and tools. It also summarizes several bytecode manipulation libraries and frameworks and provides examples of how they can be used for tasks like analysis, modification, and runtime weaving of aspects.
Back to the future with Java 7 (Geekout June/2011)Martijn Verburg
This document provides a summary of Martijn Verburg's presentation titled "Back to the Future with Java 7". The presentation covered several new features in Java 7 including Project Coin additions like strings in switch statements, try-with-resources, and diamond syntax. It also discussed NIO.2 improvements to I/O, invokedynamic, Fork/Join framework, and method handles. The presentation noted that while Java the language has been quiet, the community and platform have grown. It predicted the Java SE future looks stable while JEE and Java ME futures are less certain. The document closed with discussions on the Oracle v. Google lawsuit and the future of JavaFX.
Clojure is a LISP-like programming language that runs on the Java Virtual Machine. It was created in 2007 by Rich Hickey and is currently at version 1.1. Clojure is a functional, immutable, and concurrency-oriented language. It features LISP syntax, macros, immutability, functional programming, and easy interoperability with Java. Data structures in Clojure are code, allowing homoiconicity. Clojure also supports lazy sequences, STM-based concurrency without locks, and dynamic behavior via its REPL.
ROracle is an R package that enables connectivity to Oracle Database, allowing users to execute SQL statements from R and interface with Oracle databases. It provides a high-performance Oracle driver based on OCI. ROracle reads and writes data between R and Oracle databases much faster than other R database connectors. It is open source and available on CRAN.
Surgeons are major contributors to the opioid epidemic as they commonly prescribe opioids in the perioperative period. There are no guidelines for outpatient opioid prescribing by surgeons. The Michigan Opioid Prescription Engagement Network aims to address this issue through education of surgeons, measurement of prescribing practices, driving improvement, and community engagement. The goal is to minimize excess opioid prescribing while maintaining adequate pain management, especially for those at high risk of prolonged use.
This quick start guide summarizes how to set up and use the Yealink CP860 IP conference phone. It includes unpacking contents, connecting the phone to the network and power, and instructions for basic call features like placing and answering calls. The guide also provides details on accessing the phone's web user interface and configuring account settings.
Comparación entre el mapa curricular del nuevo modelo educativo 2016 y el map...Dolores Navarro Vieyra
El mapa curricular describe la estructura de la educación básica en México. Divide la educación en tres niveles - preescolar, primaria y secundaria. Cada nivel cubre diferentes grados escolares y áreas de aprendizaje como lenguaje, matemáticas, ciencias naturales, formación cívica y desarrollo personal. El mapa también destaca los campos formativos y asignaturas específicas para cada grado, con el objetivo de guiar el desarrollo de habilidades en los estudiantes.
This document provides information on various managerial accounting processes in SAP, including:
1. Manual cost allocation and assessment cycles to allocate costs from one cost center to another.
2. Accrual calculation processes to generate accrual documents in CO for month-end provisions.
3. Creation and use of internal orders for specific tasks and events, including statistical and real orders.
4. Budgeting and activity control processes like maintaining budget profiles and posting budgets to internal orders.
5. Creation and use of real orders to settle costs to other cost objects, along with secondary cost elements and allocation structures.
El documento habla sobre la corrupción en el Perú en los últimos gobiernos, involucrando a las empresas constructoras brasileñas como Odebrecht. Se detalla que Odebrecht pagó sobornos por más de $29 millones entre 2005-2014 para obtener obras en el Perú, comprometiendo a los gobiernos de Toledo, García y Humala. Toledo recibió $20 millones a través de sobornos, mientras que a Nadine Heredia le pagaron $3 millones. Se pide acelerar las investigaciones contra la "Banda
La historia: inicio de nuestro viaje por el tiempo.Gustavo Bolaños
Presentación para la revisión del tema respectivo, para los y las estudiantes de 7º año, del profesor Gustavo Bolaños Ramírez, del Liceo de Atenas, Alajuela, Costa Rica.
Este documento presenta un proyecto de construcción de una casa que consta de 9 tareas. Se proporcionan detalles como la matriz de precedencias, diagrama de red, fechas de inicio temprano y tardío, diagrama de carga de recursos y costos de las tareas. El resumen solicita realizar diversos cálculos y análisis como construir la red, calcular fechas críticas, comprimir el proyecto a 14 días y representarlo mediante notación AoN.
Este documento describe las máquinas síncronas y sus elementos constructivos. Explica que una máquina síncrona tiene dos devanados, uno inductor alimentado por corriente continua en el rotor y uno inducido trifásico en el estator. También cubre los circuitos equivalentes de máquinas síncronas monofásicas y polifásicas, el diagrama fasorial y los sistemas de excitación interna y externa.
프로세서에 대한 내용은 SW개발자가 깊이있게 호기심을 가지지 않을 수도 있습니다. 하지만 하드웨어 세상인 이곳도 사실은 논리적 해법으로 무장한 알고리즘의 세계라는 것을 김민장님의 책을 통해 알게되었습니다. 그래서 관련 책을 읽어보고 같이 공부하는 사람들에게 공유하기 위해 ppt 형태로 정리해보았습니다.
El documento analiza los orígenes, causas y esencia de la guerra desde una perspectiva sociopolítica. Explica que los primeros conflictos armados en las sociedades primitivas tenían una base económica y no eran inevitables. La aparición de las clases sociales y la propiedad privada trajeron la desigualdad y violencia permanente. La guerra surge como manifestación de las contradicciones entre clases y Estados, y la política determina sus objetivos y desarrollo a través de la violencia armada. El capítulo también resume concept
El documento describe las herramientas básicas de Word como la barra de menú, estilos de fuentes, tamaños de letra, apariencia de la letra con negrita, cursiva y subrayado, sangría, tablas y hojas de trabajo, explicando cómo configurar la apariencia del texto y la presentación de la información en un documento.
1) El documento trata sobre conceptos básicos de informática como dirección IP, servidor proxy, red de área local, router, conmutador, banda ancha e Internet.
2) Explica los orígenes de Internet en la década de 1960 con la creación de ARPANET y cómo se popularizó en las décadas siguientes al permitir nuevos servicios como correo electrónico y la World Wide Web.
3) Detalla algunos hitos clave como la primera conexión entre computadoras en 1969 y las primeras demostraciones públicas de ARPANET en 1972.
This document provides installation, operation, and maintenance instructions for barometric condensers. It describes the two main types of condensers and their basic parts. Installation guidelines include inspecting for damage, providing sufficient clearance and supports, and properly orienting piping. Operation involves starting condensing fluid flow before other equipment, regulating flow, and properly shutting down. Troubleshooting focuses on condensing fluid, spray devices, the tailpipe, and vapor inlet. Maintenance is recommended annually and includes inspecting and cleaning strainers and spray devices. Contact information is provided for ordering spare parts.
Este documento describe las principales herramientas de formato en Microsoft Word. Incluye secciones sobre la barra de herramientas de inicio, insertar, diseño de página, tablas de contenido e índices, y la barra de herramientas de formato. Explica funciones como estilos de texto, fuentes, tamaños de fuente, alineación, sangría, color, hipervínculos, tablas, bordes, márgenes y orientación de página.
El documento describe las funciones de la vista Backstage en Microsoft Word, que permite administrar archivos al crear, guardar, inspeccionar y configurar documentos y metadatos. La vista Backstage abre una pantalla diferente del documento y ofrece opciones para abrir, guardar, imprimir y compartir archivos. También explica cómo guardar archivos en la computadora local o en OneDrive y las diferencias entre las opciones "Guardar" y "Guardar como".
El documento describe el proceso de liofilización como un método de secado que involucra la sublimación del hielo de un producto congelado sin pasar por el estado líquido. Explica que la liofilización mantiene mejor la estructura y aspecto original del alimento, inhibe el deterioro y permite una larga conservación. También detalla las etapas del proceso, los equipos industriales utilizados y las ventajas y desventajas de este método de secado.
Este documento presenta información sobre varios temas relacionados con la tecnología de la comunicación como el traductor de Google, el correo electrónico y los teléfonos celulares. Resalta las ventajas y desventajas de cada uno de estos, incluyendo la naturalidad y variedad de idiomas del traductor de Google, la capacidad de enviar archivos a través del correo electrónico y las funciones como las redes sociales y el GPS de los teléfonos.
Java 7 was released in July 2011 with improvements to performance, concurrency, and memory management. Plans for Java 8 include modularity, lambda expressions, and date/time APIs. The Java Community Process is also being improved to increase transparency, participation, and agility through JSR 348. Overall, the Java ecosystem continues to grow with new languages on the JVM and an active community.
This document provides an overview of Maven, Java 8 features, logging, useful libraries, and testing in Java. It discusses how Maven can help solve dependency issues, key Java 8 additions like lambdas, streams and default methods. Logging with SLF4J and Logback is explained. Popular libraries like Lombok, Guava and Apache Commons are mentioned. Finally, unit testing with JUnit and mocking with Mockito is covered at a high level.
Solr provides concise summaries of key points from the document:
1. Solr discusses its search architecture including the use of Thrift for service encapsulation and reduced network traffic. Only IDs are returned from searches to reduce index size and enable easy scaling of primary key lookups.
2. Load balancing is discussed, including an algorithm that hashes the query and number of servers to provide server affinity while distributing load evenly.
3. Replication of the index is covered, including challenges with multicast and an implementation using BitTorrent to efficiently replicate files.
This document summarizes new features in Java 7, including underscores in numeric literals to improve readability, try-with-resource for automatic resource management, multi-catch exceptions, and various improvements to I/O, generics, and garbage collection. Key areas covered are numeric literals, collection initialization, try-with-resource blocks, multi-catch exceptions, final rethrow, strings in switch statements, generic instances, NIO2 file APIs, file change notifications, asynchronous I/O, URLClassLoader closing, JDBC row sets, varargs, the G1 garbage collector, and improved performance.
While most bugs reveal their cause within their stack trace, Java’s OutOfMemoryError is less talkative and therefore regarded as being difficult to debug by a majority of developers. With the right techniques and tools, memory leaks in Java programs can however be tackled like any other programming error. This talks discusses how a JVM stores data, categorizes different types of memory leaks that can occur in a Java program and presents techniques for fixing such errors. Furthermore, we will have a closer look at lambda expressions and their considerable potential of introducing memory leaks when they are used incautiously.
This document summarizes the key new features included in JDK 7. It discusses Project Coin which added features like string switching, binary literals, and the diamond operator. It also covers try-with-resources for improved exception handling, fork/join framework for parallel programming, and NIO.2 features like asynchronous I/O, watch service for monitoring file changes, and pluggable file systems.
The document summarizes an upcoming Java user group meeting to discuss Java 7 features. It will cover new language features in Java 7 like binary literals, string switches, and try-with-resources statements. It will also cover parallel programming enhancements like Fork/Join and NIO.2. The meeting will include hands-on demos of Java 7 features and a discussion of upcoming Java 8 features. Refreshments will be provided by meeting sponsor Ovialis.
Clojure is a Lisp dialect that runs on the Java Virtual Machine (JVM) and provides excellent concurrency support and tight integration with Java. It retains the advantages of Lisp such as being simple, expressive, and flexible while also allowing access to existing Java code and libraries. Clojure makes concurrency easy through features like transactional memory and agents. It can be used to create both Java and Clojure libraries and extends the Java platform.
The JVM JIT compiler and deoptimizer are triggered under certain conditions like method invocation counts, changes in program behavior, and hot spots. The JIT initially compiles code to generate fast machine instructions while the deoptimizer reverts back to interpreted execution if needed.
Introduction
Web Storage
WebSQL
IndexedDB
File System Access
Final Considerations
This presentation has been developed in the context of the Mobile Applications Development course, DISIM, University of L'Aquila (Italy), Spring 2015.
http://www.ivanomalavolta.com
Groovy is a dynamic language for the Java Virtual Machine that aims to provide productivity features like closures, builders, and metaprogramming while leveraging Java's capabilities. The document discusses why developers should use Groovy to build Atlassian plugins, noting features like closures, domain specific languages, and builders that improve productivity. It addresses myths that dynamic typing reduces IDE support and that scripting languages are unprofessional. Code examples demonstrate how Groovy code can be more concise and readable than equivalent Java code.
This has been presented in association with Robosepians for Java concepts. Basic concepts of Java including features, conditional statements, loop statements, arrays, string, primitive datatypes, essentials of Java including oops concepts, classes, objects, polymorphism, advance topics including packages, exception handling, multihtreading and network programming have been discussed.
This document summarizes some of the key enhancements between Java 6 and Java 7, including improved type inference for generics, new syntax for number and string literals, expanded exception handling with multi-catch and try-with-resources, and new concurrency utilities like the Fork/Join framework and NIO watch service. It also covers miscellaneous features like symbolic file links and method handles.
The document discusses various techniques for optimizing web program performance, including improving data structures and algorithms, reducing network, disk, and memory I/O, using NoSQL databases, optimizing frontend resource loading and execution, and testing and refactoring code for performance. It also covers specific optimizations related to caching, content delivery networks, domain name resolution, module loading, code packaging, and handling slower users.
The document discusses several common Java anti-patterns, including:
1) Approving a task by rejecting it in a method called "approve".
2) Avoiding the use of helper libraries to simplify tasks like file name parsing.
3) Using reflection when direct method calls would suffice.
AI Fusion Buddy Review: Brand New, Groundbreaking Gemini-Powered AI AppGoogle
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(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
(4) AI Ebook Suite Review: https://sumonreview.com/ai-ebook-suite-review
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Microservice Teams - How the cloud changes the way we workSven Peters
A lot of technical challenges and complexity come with building a cloud-native and distributed architecture. The way we develop backend software has fundamentally changed in the last ten years. Managing a microservices architecture demands a lot of us to ensure observability and operational resiliency. But did you also change the way you run your development teams?
Sven will talk about Atlassian’s journey from a monolith to a multi-tenanted architecture and how it affected the way the engineering teams work. You will learn how we shifted to service ownership, moved to more autonomous teams (and its challenges), and established platform and enablement teams.
Transform Your Communication with Cloud-Based IVR SolutionsTheSMSPoint
Discover the power of Cloud-Based IVR Solutions to streamline communication processes. Embrace scalability and cost-efficiency while enhancing customer experiences with features like automated call routing and voice recognition. Accessible from anywhere, these solutions integrate seamlessly with existing systems, providing real-time analytics for continuous improvement. Revolutionize your communication strategy today with Cloud-Based IVR Solutions. Learn more at: https://thesmspoint.com/channel/cloud-telephony
Neo4j - Product Vision and Knowledge Graphs - GraphSummit ParisNeo4j
Dr. Jesús Barrasa, Head of Solutions Architecture for EMEA, Neo4j
Découvrez les dernières innovations de Neo4j, et notamment les dernières intégrations cloud et les améliorations produits qui font de Neo4j un choix essentiel pour les développeurs qui créent des applications avec des données interconnectées et de l’IA générative.
Revolutionizing Visual Effects Mastering AI Face Swaps.pdfUndress Baby
The quest for the best AI face swap solution is marked by an amalgamation of technological prowess and artistic finesse, where cutting-edge algorithms seamlessly replace faces in images or videos with striking realism. Leveraging advanced deep learning techniques, the best AI face swap tools meticulously analyze facial features, lighting conditions, and expressions to execute flawless transformations, ensuring natural-looking results that blur the line between reality and illusion, captivating users with their ingenuity and sophistication.
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Utilocate offers a comprehensive solution for locate ticket management by automating and streamlining the entire process. By integrating with Geospatial Information Systems (GIS), it provides accurate mapping and visualization of utility locations, enhancing decision-making and reducing the risk of errors. The system's advanced data analytics tools help identify trends, predict potential issues, and optimize resource allocation, making the locate ticket management process smarter and more efficient. Additionally, automated ticket management ensures consistency and reduces human error, while real-time notifications keep all relevant personnel informed and ready to respond promptly.
The system's ability to streamline workflows and automate ticket routing significantly reduces the time taken to process each ticket, making the process faster and more efficient. Mobile access allows field technicians to update ticket information on the go, ensuring that the latest information is always available and accelerating the locate process. Overall, Utilocate not only enhances the efficiency and accuracy of locate ticket management but also improves safety by minimizing the risk of utility damage through precise and timely locates.
Flutter is a popular open source, cross-platform framework developed by Google. In this webinar we'll explore Flutter and its architecture, delve into the Flutter Embedder and Flutter’s Dart language, discover how to leverage Flutter for embedded device development, learn about Automotive Grade Linux (AGL) and its consortium and understand the rationale behind AGL's choice of Flutter for next-gen IVI systems. Don’t miss this opportunity to discover whether Flutter is right for your project.
Mobile App Development Company In Noida | Drona InfotechDrona Infotech
Looking for a reliable mobile app development company in Noida? Look no further than Drona Infotech. We specialize in creating customized apps for your business needs.
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Odoo ERP software
Odoo ERP software, a leading open-source software for Enterprise Resource Planning (ERP) and business management, has recently launched its latest version, Odoo 17 Community Edition. This update introduces a range of new features and enhancements designed to streamline business operations and support growth.
The Odoo Community serves as a cost-free edition within the Odoo suite of ERP systems. Tailored to accommodate the standard needs of business operations, it provides a robust platform suitable for organisations of different sizes and business sectors. Within the Odoo Community Edition, users can access a variety of essential features and services essential for managing day-to-day tasks efficiently.
This blog presents a detailed overview of the features available within the Odoo 17 Community edition, and the differences between Odoo 17 community and enterprise editions, aiming to equip you with the necessary information to make an informed decision about its suitability for your business.
Neo4j - Product Vision and Knowledge Graphs - GraphSummit ParisNeo4j
Dr. Jesús Barrasa, Head of Solutions Architecture for EMEA, Neo4j
Découvrez les dernières innovations de Neo4j, et notamment les dernières intégrations cloud et les améliorations produits qui font de Neo4j un choix essentiel pour les développeurs qui créent des applications avec des données interconnectées et de l’IA générative.
DDS Security Version 1.2 was adopted in 2024. This revision strengthens support for long runnings systems adding new cryptographic algorithms, certificate revocation, and hardness against DoS attacks.
E-commerce Development Services- Hornet DynamicsHornet Dynamics
For any business hoping to succeed in the digital age, having a strong online presence is crucial. We offer Ecommerce Development Services that are customized according to your business requirements and client preferences, enabling you to create a dynamic, safe, and user-friendly online store.
GraphSummit Paris - The art of the possible with Graph TechnologyNeo4j
Sudhir Hasbe, Chief Product Officer, Neo4j
Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
Need for Speed: Removing speed bumps from your Symfony projects ⚡️Łukasz Chruściel
No one wants their application to drag like a car stuck in the slow lane! Yet it’s all too common to encounter bumpy, pothole-filled solutions that slow the speed of any application. Symfony apps are not an exception.
In this talk, I will take you for a spin around the performance racetrack. We’ll explore common pitfalls - those hidden potholes on your application that can cause unexpected slowdowns. Learn how to spot these performance bumps early, and more importantly, how to navigate around them to keep your application running at top speed.
We will focus in particular on tuning your engine at the application level, making the right adjustments to ensure that your system responds like a well-oiled, high-performance race car.
4. Java 7
• Project Coin
• JDK 7 In Action - Learn With Java Tutorials and Developer Guides
• Using New Core Platform Features In Real Code
5. The Six Coin Features and How They help
Consistency and clarity
– 1. Improved literals
– 2. Strings in switch
Easier to use generics
– 3. SafeVarargs (removing varargs warnings)
– 4. Diamond
More concise error handling
– 5. Multi-catch and precise rethrow
– 6. Try-with-resources
6. Integral Binary Literals
// An 8-bit 'byte' value:
byte aByte = (byte)0b00100001;
// A 16-bit 'short' value:
short aShort = (short)0b1010000101000101;
// Some 32-bit 'int' values:
int anInt1 = 0b10100001010001011010000101000101;
int anInt3 = 0B101; // The B can be upper or lower case.
// A 64-bit 'long' value. Note the "L" suffix:
long aLong =
0b1010000101000101101000010100010110100001010001011010000101000101L;
7. Underscores in Literals
long creditCardNumber = 1234_5678_9012_3456L;
long socialSecurityNumber = 999_99_9999L;
long hexWords = 0xCAFE_BABE;
long maxLong = 0x7fff_ffff_ffff_ffffL;
byte nybbles = 0b0010_0101;
long bytes = 0b11010010_01101001_10010100_10010010;
8.
9. Strings in switch Statements
public String getTypeOfDayWithSwitchStatement(String dayOfWeekArg) {
String typeOfDay;
switch (dayOfWeekArg) {
case "Monday":
typeOfDay = "Start of work week";
break;
case "Tuesday":
case "Wednesday":
case "Thursday":
typeOfDay = "Midweek";
break;
case "Friday":
typeOfDay = "End of work week";
break;
case "Saturday":
case "Sunday":
typeOfDay = "Weekend";
break;
default:
throw new IllegalArgumentException("Invalid day of the week: " + dayOfWeekArg);
}
return typeOfDay;
}
10. Strings in switch Statements
What is there to discuss?
• What does switching on a null do? (NullPointerException)
• Can null be a case label? (No.)
• Case-insensitive comparisons? (No.)
• Implementation
• relies on a particular algorithm be used for String.hashCode
• on average faster than if-else chain with >3 cases
14. Multi-Catch and Precise Rethrow
Multi-catch:
ability to catch multiple exception types in a single catch clause
try {
...
} catch (FirstException | SecondException) { ... }
Precise rethrow:
change in can-throw analysis of a catch clause
16. The try-with-resources Statement
static String readFirstLineFromFile(String path) throws IOException {
try (BufferedReader br = new BufferedReader(new FileReader(path))) {
return br.readLine();
}
}
Prior to Java SE 7
static String readFirstLineFromFileWithFinallyBlock(String path) throws IOException {
BufferedReader br = new BufferedReader(new FileReader(path));
try {
return br.readLine();
} finally {
if (br != null) br.close();
}
}
17. NIO.2 File System API
Background and Motivation
The platform was long overdue something better than java.io.File
• Doesn’t work consistently across platforms
• Lack of useful exceptions when a file operation fails
• Missing basic operations, no file copy, move, ...
• Limited support for symbolic links
• Very limited support for file attributes
• No bulk access to file attributes
• Badly missing features that many applications require
• No way to plug-in other file system implementations
18. New File System API
• Path – used to locate a file in a file system
• Files – defines static methods to operate on files, directories and other types
of files
• FileSystem
• Provides a handle to a file system
• Factory for objects that access the file system
• FileSystems.getDefault returs a reference to the default FileSystem
• FileStore – the underlying storage/volume
20. public class FileSystemExampleV {
public static void main(String[] args) throws Exception {
FileSystem fileSystem = FileSystems.getDefault();
for (FileStore store : fileSystem.getFileStores()) {
System.out.println("드라이버명: " + store.name());
System.out.println("파일시스템: " + store.type());
System.out.println("전체 공간: " + store.getTotalSpace() + " 바이트");
System.out.println("사용 중인 공간: " + (store.getTotalSpace() - store.getUnallocatedSpace()) + " 바이트");
System.out.println("사용 가능한 공간: " + (store.getTotalSpace() - store.getUsableSpace()) + " 바이트");
System.out.println();
}
System.out.println("파일 구분자: " + fileSystem.getSeparator());
System.out.println();
for (Path path : fileSystem.getRootDirectories()) {
System.out.println(path.toString());
}
}
}
드라이버명:
파일시스템: NTFS
전체 공간: 127666221056 바이트
사용 중인 공간: 114883612672 바이트
사용 가능한 공간: 114883612672 바이트
드라이버명: ssd1
파일시스템: NTFS
전체 공간: 256058060800 바이트
사용 중인 공간: 193507590144 바이트
사용 가능한 공간: 193507590144 바이트
드라이버명: ssd2
파일시스템: NTFS
전체 공간: 256058060800 바이트
사용 중인 공간: 114384744448 바이트
사용 가능한 공간: 114384744448 바이트
드라이버명: data
파일시스템: NTFS
전체 공간: 2000396742656 바이트
사용 중인 공간: 953533616128 바이트
사용 가능한 공간: 953533616128 바이트
드라이버명: ssd3
파일시스템: NTFS
전체 공간: 500104687616 바이트
사용 중인 공간: 239441858560 바이트
사용 가능한 공간: 239441858560 바이트
드라이버명: Samsung1TB
파일시스템: NTFS
전체 공간: 1000194011136 바이트
사용 중인 공간: 841152049152 바이트
사용 가능한 공간: 841152049152 바이트
파일 구분자:
C:
D:
E:
F:
G:
H:
I:
21. Java 8
• What’s New in JDK 8
• Lambda
• Default Methods
• Optional
• Type Annotation
• Nashorn
• Concurrency
• Stamped Lock
• Concurrent Addr
• Parallel Sorting
• 그리고 그 외?
• New Date API
• OS Process Control
27. JVM
• 스택 기반의 가상 머신 (NOT Register 기반)
• Dalvik VM은???
• 심볼릭 레퍼런스(NOT Address 기반)
• 가비지 컬렉션
• 기본 자료형을 명확하게 정의해 플랫폼 독립성 보장
• 네트워크 바이트 순서
• Little endian vs Big endian
31. Execution Engine
• Interpreter
• JIT(Just In Time)
• Oracle hotspot VM
• From JDK 1.3 ~
• Dalvik VM from Android 2.2 ~
• IBM AOT(Ahead-Of-Time)
• From JDK6
32. Garbage Collection
• “stop-the-world”
• Young Generation
• Eden
• Survivor(2개)
• Old Generation (JDK 7)
• Serial GC
• Parallel GC
• Parallel Old GC(Parallel Compacting GC)
• Concurrent Mark & Sweep GC
• G1(Garbage First) GC
42. Reorder
class Something {
private int x = 0;
private int y = 0;
public void write() {
x = 100;
y = 50;
}
public void read() {
if (x < y) {
System.out.println("x < y");
}
}
}
public class Reorder {
public static void main(String[] args) {
final Something obj = new Something();
new Thread() { // Thread A
public void run() {
obj.write();
}
}.start();
new Thread() { // Thread B
public void run() {
obj.read();
}
}.start();
}
}
x < y가 출력될 수 있을까?