Windows APIã‚’Javaã‹ã‚‰å‘¼ã³å‡ºã™ï¼ˆJNA） - torutkã®ãƒ–ãƒã‚°
昨日ã®æ—¥è¨˜ï¼ˆid:torutk:20121019）ã§ã€nativeメソッドSystem.nanoTime()ã®Windowsã§ã®å®Ÿè£…を調ã¹ã€ãã®å®Ÿè£…ã§ä½¿ç”¨ã—ã¦ã„ã‚‹Windows API QueryPerformanceCounterã‚’C/C++コードã§å‹•ã‹ã™ã“ã¨ã§åˆ†è§£èƒ½ï¼ˆå‘¨æ³¢æ•°ï¼‰ã¨APIã®å‡¦ç†æ™‚é–“ã‚’å–å¾—ã—ã¾ã—ãŸã€‚ ãã®ãŸã‚ã«ã¯ã€Windows APIを呼ã³å‡ºã›ã‚‹C/C++開発環境*1をセットアップã™ã‚‹å¿…è¦ãŒã‚ã‚Šã¾ã™ã€‚ã¾ãŸã€Javaã«ã¯ãƒã‚¤ãƒ†ã‚£ãƒ–コード（C/C++）を呼ã³å‡ºã™ãŸã‚ã®JNIã¨ã„ã†ä»•çµ„ã¿ãŒæ¨™æº–装備ã•ã‚Œã¦ã„ã¾ã™ãŒã€ã“れもC/C++開発環境ãŒå¿…è¦ã¨ãªã‚Šã¾ã™ã€‚ ãã“ã§ã€æ—¢å˜ã®Cライブラリ（Windows APIãªã©ï¼‰ã‚’Javaã‹ã‚‰ç›´æŽ¥å‘¼ã³å‡ºã™ã“ã¨ãŒã§ãã‚‹JNAライブラリを使用ã—ã¦ã¿ã¾ã—ãŸã€‚JNAを使ãˆã°ã€JNIã®ã‚ˆã†ã«C/C++コードを書ã‹ãªãã¦æ¸ˆã¿ã¾ã™ã€‚ JNAライブラリã®å…¥æ‰‹ JN
JNAã§ã¯ã¾ã‚‹ã€ãã®ï¼’。__attribute__((__packed__))ã®ãƒžãƒƒãƒ”ングをã™ã‚‹ã€‚ - StoryEdit 開発日誌
ã•ã‚‰ã«ï¼’時間ã»ã©ã¯ã¾ã£ãŸã€‚。。第一回ã¯ä»¥ä¸‹ã‹ã‚‰ã€‚ JNAã§ã¯ã¾ã‚‹ã€‚Javaã‹ã‚‰epollを使ã„ãŸã„。 - StoryEdit 開発日誌 ã•ã¦ã€ã‚„ã‚ŠãŸã„ã“ã¨ã¯epollã‚’JNAã‹ã‚‰ä½¿ã†ã£ã¦ã“ã¨ã ãŒã€ã„ã‹ã‚“ã›ã‚“ã€JNAåˆå¿ƒè€…ã«ã¯å¦ã¶ã“ã¨ãŒãŠãŠã„。 ãã‚‚ãã‚‚ãƒã‚¤ãƒ³ãƒ‰ã—ãŸã„æ§‹é€ ä½“ã‚’ã¿ã¦ã¿ã‚‹ã€‚ typedef union epoll_data { void *ptr; int fd; uint32_t u32; uint64_t u64; } epoll_data_t; struct epoll_event { uint32_t events; /* Epoll events */ epoll_data_t data; /* User data variable */ } __attribute__ ((__packed__)); 最åˆã¯"union"を見逃ã—ã¦ã„ãŸãŸã‚ã€å¾Œã«è‹¦åŠ´ã—ãŸãŒã€ã“ã®æ§‹é€ 体ã®
JNAã§ã¯ã¾ã‚‹ã€‚ãã®ï¼“。　jna3ã‹ã‚‰jna4ã€Direct mappingã¸ç§»è¡Œã™ã‚‹ã€‚ - StoryEdit 開発日誌
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» JNA vs P/Invoke from a performance perspective coUnity Software Development
Recently, I was asked to help evaluating whether Java (using JNA) or .NET/Mono (using P/Invoke) had the smaller performance overhead for accessing native code from a managed environment. The context The EPICS project is a joint research project of eight European research partnes in the field of sensor networks. The Pervasive Computing Group at the Alpen-Adria Universität Klagenfurt is participati
JNA, JNI and Raw Java Performance - OpenGamma
What was said last In my previous blog post I wrote about sparse matrix support in the OG-Maths library and how we are working on sparse direct decompositions. This is still true, and they are still in the pipeline. Whilst writing these sparse algorithms we found that having a reference implementation of equivalent dense matrix code massively aided debugging. So we wrote dense implementations of L
jna/www/DirectMapping.md at master · java-native-access/jna
JNA supports a direct mapping method which can improve performance substantially, approaching that of custom JNI. Method signatures are the same as they would be in a JNA interface mapping, but they can be any static or object methods. You only need register them within the static initializer of the defining class, as in the example below. The Native.register() method takes the name of your native
JNIã¨JNAã®ãƒ™ãƒ³ãƒãƒžãƒ¼ã‚¯ - maachangã®æ—¥è¨˜
Javaã‹ã‚‰C言語ãªã©ã®ãƒ©ã‚¤ãƒ–ラリã«ã‚¢ã‚¯ã‚»ã‚¹ã™ã‚‹æ–¹æ³•ã¨ã—ã¦ã€JNI(Java-Native-Interface)ãŒã‚る。 最近知ã£ãŸã®ã ãŒã€JNA(Java-Native-Access)ã¨ã„ã†ã‚‚ã®ãŒã‚ã‚Šã€ã¨ã¦ã‚‚便利ã¿ãŸã„。下記ã®ã‚µãƒ³ãƒ—ルソース import com.sun.jna.Library; import com.sun.jna.Native; import com.sun.jna.Platform; /** Simple example of native library declaration and usage. */ public class HelloWorld { public interface CLibrary extends Library { CLibrary INSTANCE = (CLibrary) Native.loadLibrary( (Platform.
Windows64bitã§JNAã§Javaã‹ã‚‰C++コード呼ã³å‡ºãã†ã¨ã—ã¦ãƒãƒžã£ãŸè©± - ãã—ã ã®Hatena
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æ³¥è‡ãJNAã«ãƒãƒ£ãƒ¬ãƒ³ã‚¸ - DO☆KA☆TA ~information technology~
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mono's Tech Blog » JNIよりãšã£ã¨ãŠæ‰‹è»½ãªJNA(Java Native Access)
Javaã§Cã®ãƒ€ã‚¤ãƒŠãƒŸãƒƒã‚¯ãƒªãƒ³ã‚¯ãƒ©ã‚¤ãƒ–ラリã«ã‚¢ã‚¯ã‚»ã‚¹ 僕ã¯æ£ç›´ãªã¨ã“ã‚，C言語ãŒè‹¦æ‰‹ï¼Ž ã©ã†ã—ã¦ã‚‚å¿…è¦ãªã¨ãã§ãªã„é™ã‚Šï¼ŒJavaãªã©ã®ä½¿ã„慣れã¦ã„る言語を使ã„ãŸã„ã¨ã“ã‚． ãŸã ，やã¯ã‚Šã©ã†ã—ã¦ã‚‚Cã®ãƒ©ã‚¤ãƒ–ラリを使ã„ãŸã„ã¨ããŒå‡ºã¦ãるケースもã‚る． ãã†ã„ã†ã¨ãã«ï¼Œ Cã§æ›¸ãã¹ã箇所ãŒã»ã‚“ã®ä¸€éƒ¨ãªã®ã«ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆå…¨ä½“ã‚’Cã§æ›¸ãã®ã¯ãƒŠãƒ³ã‚»ãƒ³ã‚¹ï¼Ž ãã“ã§ï¼ŒJNIãªã©ã®å‡ºç•ªã¨ãªã‚‹ã‚ã‘ã§ãŒï¼Œã“ã‚ŒãŒã‘ã£ã“ã†é¢å€’ã§æ›¸ãコードé‡ã‚‚ãã“ãã“多ã„． 実を言ã†ã¨ï¼Œæ˜”å°‘ã—触れãŸç¨‹åº¦ã§ã‚ˆã分ã‹ã£ã¦ãªã‹ã£ãŸã‚Šâ€¦ ã§ï¼Œè‰²ã€…便利ãªé“å…·ãŒå……実ã—ã¦ã„る昨今，何ã‹ãã‚Œã«å¤‰ã‚ã‚‹ã‚‚ã®ãŒç„¡ã„ã‹æŽ¢ã—ã¦ã„ãŸã¨ã“ã‚，JNA(Java Native Access)ã¨ã„ã†ã‚‚ã®ã‚’発見． Java Native Access (JNA) ã¨ã¯ã€Java プãƒã‚°ãƒ©ãƒ ãŒJava Native Interfaceを用ã„ãšã«ãƒã‚¤ãƒ†ã‚£ãƒ–ã®å…±æœ‰ãƒ©ã‚¤
Javaã§JNAを使ㆠ- 怒涛ã®ã‚ã‚‚ã‚もリンク集
Javaã§JNAを使ㆠJavaã‹ã‚‰OpenCVã‚’JNA (Java Native Access) 経由ã§ä½¿ã†é‡Žæœ›ã®ç¶šã： 以下ã‹ã‚‰ jna.jarã®æœ€æ–°ç‰ˆã‚’入手 Java Native Access (JNA) Download ã“れをé©å½“ãªãƒ©ã‚¤ãƒ–ラリパス（Windows ãªã‚‰ C:\Program Files\Java\JNA\ ãªã©ï¼‰ã«ãŠãã€ç’°å¢ƒå¤‰æ•° CLASSPATH ã« jna.jar ã¾ã§å«ã‚ãŸå½¢ã§C:\Program Files\Java\JNA\jna.jarãªã©ã¨æŒ‡å®šã™ã‚‹ã€‚Windows ã®å ´åˆã¯ã€ã‚³ãƒ³ãƒˆãƒãƒ¼ãƒ«ãƒ‘ãƒãƒ«â†’システム→詳細è¨å®šâ†’環境変数ã§ã€CLASSPATHã‚’æ–°è¦è¿½åŠ ã‚ã‚‹ã„ã¯æ—¢å˜ã®ã‚‚ã®ã‚’編集：
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