Characterising JVM Programming Languages
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Scala: a Functional, Object-Oriented Language COEN 171 Darren Atkinson What Is Scala? Scala Stands for Scalable Language It Was Created in 2004 by Martin Odersky
Scala: A Functional, Object-Oriented Language COEN 171 Darren Atkinson What is Scala? Scala stands for Scalable Language It was created in 2004 by Martin Odersky. It was designed to grow with the demands of its users. It was designed to overcome many criticisms of Java. It is compiled to Java bytecode and is interoperable with existing Java classes and libraries. It is more of a high-level language than Java, having higher- order containers and iteration constructs built-in. It encourages a functional programming style, much like ML and Scheme. It also has advanced object-oriented features, much like Java and C++. Using Scala Using Scala is much like using Python or ML, and is not as unwieldy as using Java. The Scala interpreter can be invoked directly from the command line: $ scala Welcome to Scala 2.11.8 scala> println("Hi!") The Scala interpreter can also be given a file on the command line to execute: $ scala foo.scala Scala Syntax Scala has a Java-like syntax with braces. The assignment operator is simply =. Strings are built-in and use + for concatenation. Indexing is done using ( ) rather than [ ]. The first index is index zero. Parameterized types use [ ] rather than < >. A semicolon is inferred at the end of a line. However, since it is functional, everything is an expression and there are no “statements”. Scala Types In Java, the primitive types are not objects and wrapper classes must be used. Integer for int, Boolean for bool, etc. In Scala, everything is an object including the more “primitive” types. The Scala types are Int, Boolean, String, etc. -
Sun Glassfish Enterprise Server V3 Scripting Framework Guide
Sun GlassFish Enterprise Server v3 Scripting Framework Guide Sun Microsystems, Inc. 4150 Network Circle Santa Clara, CA 95054 U.S.A. Part No: 820–7697–11 December 2009 Copyright 2009 Sun Microsystems, Inc. 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved. Sun Microsystems, Inc. has intellectual property rights relating to technology embodied in the product that is described in this document. In particular, and without limitation, these intellectual property rights may include one or more U.S. patents or pending patent applications in the U.S. and in other countries. U.S. Government Rights – Commercial software. Government users are subject to the Sun Microsystems, Inc. standard license agreement and applicable provisions of the FAR and its supplements. This distribution may include materials developed by third parties. Parts of the product may be derived from Berkeley BSD systems, licensed from the University of California. UNIX is a registered trademark in the U.S. and other countries, exclusively licensed through X/Open Company, Ltd. Sun, Sun Microsystems, the Sun logo, the Solaris logo, the Java Coffee Cup logo, docs.sun.com, Enterprise JavaBeans, EJB, GlassFish, J2EE, J2SE, Java Naming and Directory Interface, JavaBeans, Javadoc, JDBC, JDK, JavaScript, JavaServer, JavaServer Pages, JMX, JRE, JSP,JVM, MySQL, NetBeans, OpenSolaris, SunSolve, Sun GlassFish, ZFS, Java, and Solaris are trademarks or registered trademarks of Sun Microsystems, Inc. or its subsidiaries in the U.S. and other countries. All SPARC trademarks are used under license and are trademarks or registered trademarks of SPARC International, Inc. in the U.S. and other countries. -
(Cont'd) Current Trends
Scripting vs Systems Programming Languages (cont’d) Designed for gluing Designed for building Does application implement complex algorithms and data applications : flexibility applications : efficiency structures? Does application process large data sets (>10,000 items)? Interpreted Compiled Are application functions well-defined, fixed? Dynamic variable creation Variable declaration If yes, consider a system programming language. Data and code integrated : Data and code separated : meta-programming cannot create/run code on Is the main task to connect components, legacy apps? supported the fly Does the application manipulate a variety of things? Does the application have a GUI? Dynamic typing (typeless) Static typing Are the application's functions evolving rapidly? Examples: PERL, Tcl, Examples: PL/1, Ada, Must the application be extensible? Python, Ruby, Scheme, Java, C/C++, C#, etc Does the application do a lot of string manipulation? Visual Basic, etc If yes, consider a scripting language. cs480 (Prasad) LSysVsScipt 1 cs480 (Prasad) LSysVsScipt 2 Current Trends Jython (for convenient access to Java APIs) Hybrid Languages : Scripting + Systems Programming I:\tkprasad\cs480>jython – Recent JVM-based Scripting Languages Jython 2.1 on java1.4.1_02 (JIT: null) Type "copyright", "credits" or "license" for more information. »Jython : Python dialect >>> import javax.swing as swing >>> win = swing.JFrame("Welcome to Jython") »Clojure : LISP dialect >>> win.size = (200, 200) »Scala : OOP +Functional Hybrid >>> win.show() -
Amazon Codeguru Profiler
Amazon CodeGuru Profiler User Guide Amazon CodeGuru Profiler User Guide Amazon CodeGuru Profiler: User Guide Copyright © Amazon Web Services, Inc. and/or its affiliates. All rights reserved. Amazon's trademarks and trade dress may not be used in connection with any product or service that is not Amazon's, in any manner that is likely to cause confusion among customers, or in any manner that disparages or discredits Amazon. All other trademarks not owned by Amazon are the property of their respective owners, who may or may not be affiliated with, connected to, or sponsored by Amazon. Amazon CodeGuru Profiler User Guide Table of Contents What is Amazon CodeGuru Profiler? ..................................................................................................... 1 What can I do with CodeGuru Profiler? ......................................................................................... 1 What languages are supported by CodeGuru Profiler? ..................................................................... 1 How do I get started with CodeGuru Profiler? ................................................................................ 1 Setting up ......................................................................................................................................... 3 Set up in the Lambda console ..................................................................................................... 3 Step 1: Sign up for AWS .................................................................................................... -
Enrico Rubboli
Enrico Rubboli Contact Information Mobile UK: +44 741 4734233 Mobile IT: +39 349 8083244 E-mail: [email protected] Website: http://rubbo.li Personal Citizenship: Italian Information Gender: Male Date of Birth: 1976 October 27th Profile I'm a Senior Software Engineer with experience in several fields of web development. Switched to Ruby few years ago I can now boast several successful projects delivered. I'm currently searching for a new interesting opportunity in the fintech field. • 6 years of experience in Ruby and Rails • 14 years of overall experience as Web Developer • 14 years of experience in UNIX/networking/security • worked for the last 7 years with english speaking companies Technical Skills OS: GNU Linux (debian/arch), FreeBSD, OSX Programming: Ruby, Java, PHP, Perl, Bash/Zsh, C, Go lang Web & frameworks: Ruby on Rails, Sinatra, Symfony (PHP), JBoss (Java) and Torquebox (Jruby) TDD: JUnit, Rspec, Cucumber, Test:Unit Agile: Scrum, Pair Programming, XP Admins: Managing availability, scalability and efficiency of distributed systems, docker Networking: Firewalls (iptables/ipfw), IPsec, SSL, HTTP etc. Professional Experience Bitfinex - iFinex INC, Feb 2016 - present Role: Senior Software Engineer { Working in a very small team. { Different architectures and languages, in particular GoLang - Ruby and NodeJS. { Built the development environment on docker Company info: http://bitfinex.com - Hong Kong Burnside Digital Inc, Nov 2013 - Feb 2016 Role: Senior Software Engineer { Building apps using ruby on rails, nodeJS, AngularJS and Faye. { Assisting the sales team during the estimation process. { Leader of the web team Company info: http://burnsidedigital.com - Portland, OR, USA 1 of 2 Digital Science, Oct 2012 - Nov 2013 Role: Senior Software Engineer { Member of the central team. -
A Post-Apocalyptic Sun.Misc.Unsafe World
A Post-Apocalyptic sun.misc.Unsafe World http://www.superbwallpapers.com/fantasy/post-apocalyptic-tower-bridge-london-26546/ Chris Engelbert Twitter: @noctarius2k Jatumba! 2014, 2015, 2016, … Disclaimer This talk is not going to be negative! Disclaimer But certain things are highly speculative and APIs or ideas might change by tomorrow! sun.misc.Scissors http://www.underwhelmedcomic.com/wp-content/uploads/2012/03/runningdude.jpg sun.misc.Unsafe - What you (don’t) know sun.misc.Unsafe - What you (don’t) know • Internal class (sun.misc Package) sun.misc.Unsafe - What you (don’t) know • Internal class (sun.misc Package) sun.misc.Unsafe - What you (don’t) know • Internal class (sun.misc Package) • Used inside the JVM / JRE sun.misc.Unsafe - What you (don’t) know • Internal class (sun.misc Package) • Used inside the JVM / JRE // Unsafe mechanics private static final sun.misc.Unsafe U; private static final long QBASE; private static final long QLOCK; private static final int ABASE; private static final int ASHIFT; static { try { U = sun.misc.Unsafe.getUnsafe(); Class<?> k = WorkQueue.class; Class<?> ak = ForkJoinTask[].class; example: QBASE = U.objectFieldOffset (k.getDeclaredField("base")); java.util.concurrent.ForkJoinPool QLOCK = U.objectFieldOffset (k.getDeclaredField("qlock")); ABASE = U.arrayBaseOffset(ak); int scale = U.arrayIndexScale(ak); if ((scale & (scale - 1)) != 0) throw new Error("data type scale not a power of two"); ASHIFT = 31 - Integer.numberOfLeadingZeros(scale); } catch (Exception e) { throw new Error(e); } } } sun.misc.Unsafe -
Characteristics of Dynamic JVM Languages
Characteristics of Dynamic JVM Languages Aibek Sarimbekov Andrej Podzimek Lubomir Bulej University of Lugano Charles University in Prague University of Lugano fi[email protected] [email protected]ff.cuni.cz fi[email protected] Yudi Zheng Nathan Ricci Walter Binder University of Lugano Tufts University University of Lugano fi[email protected] [email protected] fi[email protected] Abstract However, since the JVM was originally conceived for The Java Virtual Machine (JVM) has become an execution a statically-typed language, the performance of the JVM platform targeted by many programming languages. How- and its JIT compiler with dynamically-typed languages is ever, unlike with Java, a statically-typed language, the per- often lacking, lagging behind purpose-built language-specific formance of the JVM and its Just-In-Time (JIT) compiler JIT compilers. Making the JVM perform well with various with dynamically-typed languages lags behind purpose-built statically- and dynamically-typed languages clearly requires language-specific JIT compilers. In this paper, we aim to significant effort, not only in optimizing the JVM itself, but contribute to the understanding of the workloads imposed on also, more importantly, in optimizing the bytecode-emitting the JVM by dynamic languages. We use various metrics to language compiler, instead of just relying on the original JIT characterize the dynamic behavior of a variety of programs to gain performance [8]. This in turn requires that developers written in three dynamic languages (Clojure, Python, and of both the language compilers and the JVM understand the Ruby) executing on the JVM. We identify the differences characteristics of the JVM workloads produced by various with respect to Java, and briefly discuss their implications. -
Debian Java Insights and Challenges
Debian Java Insights and challenges Markus Koschany FOSDEM 19 Brussels / Belgium February, 3rd 2019 Markus Koschany Debian Java: Insights and challenges FOSDEM 19 1/7 The importance of Java Source / binary packages maintained by the Java team: 1033 / 1644 (+10,84 % since Debian 9) Source lines of code (Rank 3) : 90,744,884 Popcon value OpenJDK-8 (installed): 78104 / 199604 Popular libraries: apache-commons-*, javamail, xerces2, bouncycastle Popular applications: libreoffice, netbeans, pdfsam, sweethome3d, freeplane, freecol Frequently used for scientific research, medical care and bioinformatics. Markus Koschany Debian Java: Insights and challenges FOSDEM 19 2/7 What is new in Buster? OpenJDK 11 transition completed. (required more than 400! package updates) Build tools: Ant and Maven are up-to-date. Gradle is stuck at the last pre-Kotlin version. SBT is still being worked on. JVM languages: Groovy 2.14, Scala 2.11.12 (2.12 requires SBT), Clojure 1.9, Jython 1.7.1, JRuby 9.1.13 (?), Kotlin is wanted but hard to bootstrap. IDE: Eclipse is gone (lack of maintainers) but there is Netbeans 10 now. Server: Jetty 9.4 and Tomcat 9 fully up-to-date with systemd integration. Reproducibility rate is at 85% (was 75%) https://reproducible-builds.org Markus Koschany Debian Java: Insights and challenges FOSDEM 19 3/7 Packaging challenges “None of the packages in the main archive area require software outside of that area to function” Internet downloads at build time are not allowed No prebuilt jar or class files! Java is version-centric. Every developer has to update every dependency themself in this model. -
Ola Bini Computational Metalinguist [email protected] 698E 2885 C1DE 74E3 2CD5 03AD 295C 7469 84AF 7F0C
JRuby For The Win Ola Bini computational metalinguist [email protected] http://olabini.com/blog 698E 2885 C1DE 74E3 2CD5 03AD 295C 7469 84AF 7F0C onsdag 12 juni 13 Logistics and Demographics onsdag 12 juni 13 LAST MINUTE DEMO onsdag 12 juni 13 JRuby Implementation of the Ruby language Java 1.6+ 1.8.7 and 1.9.3 compatible (experimental 2.0 support) Open Source Created 2001 Embraces testing Current version: 1.7.4 Support from EngineYard, RedHat & ThoughtWorks onsdag 12 juni 13 Why JRuby? Threading Unicode Performance Memory Explicit extension API and OO internals Libraries and legacy systems Politics onsdag 12 juni 13 InvokeDynamic onsdag 12 juni 13 JRuby Differences Most compatible alternative implementation Native threads vs Green threads No C extensions (well, some) No continuations No fork ObjectSpace disabled by default onsdag 12 juni 13 Simple JRuby onsdag 12 juni 13 Java integration Java types == Ruby types Call methods, construct instances Static generation of classes camelCase or snake_case .getFoo(), setFoo(v) becomes .foo and .foo = v Interfaces can be implemented Classes can be inherited from Implicit closure conversion Extra added features to Rubyfy Java onsdag 12 juni 13 Ant+Rake onsdag 12 juni 13 Clojure STM onsdag 12 juni 13 Web onsdag 12 juni 13 Rails onsdag 12 juni 13 Sinatra onsdag 12 juni 13 Trinidad onsdag 12 juni 13 Swing Swing API == large and complex Ruby magic simplifies most of the tricky bits Java is a very verbose language Ruby makes Swing fun (more fun at least) No consistent cross-platform GUI library for Ruby -
Android Geeknight Presentation 2011-03
Android Geek Night 3.0 Per Nymann Jørgensen [email protected] Niels Sthen Hansen [email protected] Android Geek Night 3.0 Android at a glance New features in Gingerbread & Honeycomb Demos & Code Android 101 Operating system targeting mobile devices/Tables devices Linux based - with additions Open source under the Apache License Allows development in Java Share of worldwide 2010 Q4 smartphone sales to end users by Or Scala, JRuby, Groovy .. operating system, according toCanalys.[35] Two new versions just came out.. Android 101 - Dalvik VM Virtual machine developed by Google for mobile devices Uses the Dalvik Executable (.dex) format Designed for limited processing power and memory Register-based architecture as opposed to stack machine Java VMs Class library based on Apache Harmony No AWT, Swing No Java ME Android 101 - SDK Android libraries The SDK and AVD manager, for maintaining the SDK components and creating virtual devices LogCat to capture logs from running device DDMS – Dalvik Debug Monitor Tools to convert Java .class files to Dalvik bytecode and create installable .apk files Plugin for Eclipse - Android Development Tools (ADT) Android 101 - Components Activity GUI Service non-GUI Broadcast Receiver Events Content Provider Exposing data/content across applications An Android application can be seen as a collection of components. Android API 10 New stuff New Sensors / New Sensor APIs Gyroscope Rotation vector Acceleration Linear acceleration (acceleration without gravity) Gravity (gravity without acceleration) Barometer (air pressure) Android API 10 New stuff NFC Short range wireless communication. Do not require discovery or pairing Supported mode as of 2.3.3 (reader/writer/P2P limited) Enable application like Mobile ticketing (dare we say rejsekort), Smart poster, etc. -
Nashorn Architecture and Performance Improvements in the Upcoming JDK 8U40 Release
Oracle Blogs Home Products & Services Downloads Support Partners Communities About Login Oracle Blog Nashorn JavaScript for the JVM. Nashorn architecture and performance improvements in the upcoming JDK 8u40 release By lagergren on Dec 12, 2014 Hello everyone! We've been bad att blogging here for a while. Apologizes for that. I thought it would be prudent to talk a little bit about OpenJDK 8u40 which is now code frozen, and what enhancements we have made for Nashorn. 8u40 includes a total rewrite of the Nashorn code generator, which now contains the optimistic type system. JavaScript, or any dynamic language for that matter, doesn't have enough statically available type information to provide performant code, just by doing compile time analysis. That's why we have designed the new type system to get around this performance bottleneck. While Java bytecode, which is the output of the Nashorn JIT, is strongly typed and JavaScript isn't, there are problems translating the AST to optimal bytecode. Attila Szegedi, Hannes Wallnöfer and myself have spent significant time researching and implementing this the last year. Background: Conservatively, when implementing a JavaScript runtime in Java, anything known to be a number can be represented in Java as a double, and everything else can be represented as an Object. This includes numbers, ints, longs and other primitive types that aren't statically provable. Needless to say, this approach leads to a lot of internal boxing, which is quite a bottleneck for dynamic language execution speed on the JVM. The JVM is very good at optimizing Java-like bytecode, and this is not Java-like bytecode. -
Java in Embedded Linux Systems
Java in Embedded Linux Systems Java in Embedded Linux Systems Thomas Petazzoni / Michael Opdenacker Free Electrons http://free-electrons.com/ Created with OpenOffice.org 2.x Java in Embedded Linux Systems © Copyright 2004-2007, Free Electrons, Creative Commons Attribution-ShareAlike 2.5 license http://free-electrons.com Sep 15, 2009 1 Rights to copy Attribution ± ShareAlike 2.5 © Copyright 2004-2008 You are free Free Electrons to copy, distribute, display, and perform the work [email protected] to make derivative works to make commercial use of the work Document sources, updates and translations: Under the following conditions http://free-electrons.com/articles/java Attribution. You must give the original author credit. Corrections, suggestions, contributions and Share Alike. If you alter, transform, or build upon this work, you may distribute the resulting work only under a license translations are welcome! identical to this one. For any reuse or distribution, you must make clear to others the license terms of this work. Any of these conditions can be waived if you get permission from the copyright holder. Your fair use and other rights are in no way affected by the above. License text: http://creativecommons.org/licenses/by-sa/2.5/legalcode Java in Embedded Linux Systems © Copyright 2004-2007, Free Electrons, Creative Commons Attribution-ShareAlike 2.5 license http://free-electrons.com Sep 15, 2009 2 Best viewed with... This document is best viewed with a recent PDF reader or with OpenOffice.org itself! Take advantage of internal