JNR: Java Native Runtime

Transcript of "JNR: Java Native Runtime"

1. 1. J ava N ative R untime Java in the Box Y. Sakuraba
2. 2. Agenda Background JNR How To Use JNR Project Panama
3. 3. Background
4. 4. Standard Interface JaVa to Call Native Code javah Interface Need to Modify C/ C++ Hard to Use
5. 5. JNl rapper Java Native Access Easy to Use No javah Performance . ... ... . . ..
6. 6. _ Two is Too lfiignyg _ One is Not Enough
7. 7. Java Ngtjye Runtime
8. 8. Author: Charles Nutter JRuby Guy
9. 9. Problems in JRuby OS Level: Filesystem, spawn. .. Library: Graphics, Crypto, NoSQL C ext Replacement/ Transition Lang & Runtime: LLVM, Chang, V8
10. 10. Easy to Use Java N ativ e Good Performance Runtime Many Features
11. 11. GitHub https: //github. com/ jnr Java jnr-ffi Main Part » jffi FFl for Java Nalylve jnr-posix POSIX Runtlme jnr-constants Define Constants jnr-unixsoeket UNIX Socket jnr-signal Handle Signal et al.
12. 12. J NI JNR mm: JNI Call Java World Native World JNI lmpl JNI lmpl W Target Lib.
13. 13. Foreign Function Interface Interface to Call C/ C++ for High-Level Language Iibffi
14. 14. Java Foreign Function Interface Iibffi based Low-Level Lib Broad Platform Support Darwin universal Linux x86, X64, ARM, PPC. .. Windows x86, x64 l FreeBSD/ OpenBSD x86,x64 g Solaris x86,x64,Sparc et al.
15. 15. How to Use JNR
16. 16. Getting PID public class GetPidJNI { public static native long getpid(); ‘I’. t’ - - JaVa : gys%erli. load("pid"); load | 'bp'd°s° javah public static void main(String. .. args ) { getpid();
17. 17. <3’: -at: ;til-r. ig i i ‘It i . =.l‘V. /,= .Il“l Ciiisliiicri . 6;‘-or-—*“C: F"'i ciETlIE‘. _ii oii; i.'ifi. i9.~ I-_"i; i 3|}? !-1 l, lllll Iii L r‘. ’i"'i riiC ‘l. 't. k,CZi= <1f'l rr"i . lfl. " it/ 'c ii if i **”** artetti‘“T“ i iii .4 . TIBET/ iiEZ‘CF'Cl: '”‘ iii ‘i. «m; —i TliLI1<f. A. L- r‘ F ‘F TL. ’-. l‘V. /,= .l , Cil§lI'IlC>_, ¢l§~"lIE’”'lCETIMI; if ? Ii[I. jz~'. rry , , f‘i C ‘L. =.: :.; : J g; ‘l _, 'i‘
18. 18. Getting PID | #include "demo_GetPidJNI. h" jlong JNICALL Java_demo_GetPidJNI_ etpid(JNIEnv *env Java g jclass c) {, javah } return getpid(); C/ C++
19. 19. Getting PHD public class GetPidJNR { JdF§ public interface GetF'i { } long getpid(); I public static void main(String. .. args ) { GetPid getpid ‘ = LibraryLoader. create(CetPid. class) . load("c"); F W: x: getpid. getpid();
20. 20. POSIX POSIX posix = POSIXFactory. getPOSIX(); int pid _ . posix. getpid(); int uid posix. getuid(); Enable ta Use Windows
21. 21. UNIX Domain Socket File path = new java. io. File("/ tmp/ tmp-socket"); UnixSocketAddress address = new UnixSocketAddress(path); UnixSocketChannel channel = UnixSocketChannel. open(address); InputStream stream = Channels. newInputStream(channel);
22. 22. Signal Signal s new Signal("HUP"); Signal. handle(s, signal -> { / / Do something });
23. 23. Project Panama
24. 24. Project Pglama lnterconnecting JVM and Native Code Lead: John Rose
25. 25. Project Pglama Array 2.0 Native Method Handle Native Memory Layout JEP 191: FFI
26. 26. User Code If J NR Stub If JNI Ca" I‘ I? :ri: fI V 9 I I liiéifl >-pe'j"J J H JNl {L lmpl mt? ‘ *’* ’_I. gf - jffi I V ,9. . LI . ~_ ’ ‘V. i q ‘W I my ‘: ’/| .?iaI , .:vI‘I@; .:(; Target Libs
27. 27. Conclusion JNI: Hard to Use JNA: Low Performance » JNR Easy to Use Good Performance Many Features I} Panama FFI
28. 28. J ava N ative R untime Java in the Box Y. Sakuraba