{"id":90484,"date":"2020-08-01T13:42:39","date_gmt":"2020-08-01T11:42:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obnovlenie-jpype-1-0-2-biblioteki-dlya-dostupa-k-java-klassam-iz-python"},"modified":"2020-08-01T13:42:39","modified_gmt":"2020-08-01T11:42:39","slug":"obnovlenie-jpype-1-0-2-biblioteki-dlya-dostupa-k-java-klassam-iz-python","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/obnovlenie-jpype-1-0-2-biblioteki-dlya-dostupa-k-java-klassam-iz-python","title":{"rendered":"Aktualizace JPype 1.0.2, knihovny pro p\u0159\u00edstup k Java t\u0159\u00edd\u00e1m z Pythonu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/jpype-project\/jpype\/releases\/tag\/1.0.2\">Dostupn\u00e9<\/a><\/noindex> nov\u00e9 vyd\u00e1n\u00ed vrstvy <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/jpype-project\/jpype\/\">JPype 1.0.2<\/a><\/noindex>, kter\u00e1 umo\u017e\u0148uje pln\u00fd p\u0159\u00edstup Python aplikac\u00ed k Java knihovn\u00e1m t\u0159\u00edd. Pomoc\u00ed JPype je mo\u017en\u00e9 vyu\u017e\u00edvat specifick\u00e9 Java knihovny z Pythonu a vytv\u00e1\u0159et hybridn\u00ed aplikace kombinuj\u00edc\u00ed k\u00f3d v Java a Python. Na rozd\u00edl od Jythonu, integrace s Java je dosa\u017eena nikoli vytvo\u0159en\u00edm varianty Pythonu pro JVM, ale interakc\u00ed na \u00farovni obou virtu\u00e1ln\u00edch stroj\u016f s vyu\u017eit\u00edm sd\u00edlen\u00e9 pam\u011bti. Tento p\u0159\u00edstup nejen\u017ee poskytuje dobrou v\u00fdkonnost, ale tak\u00e9 umo\u017e\u0148uje p\u0159\u00edstup ke v\u0161em knihovn\u00e1m CPython a Java. K\u00f3d projektu <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/jpype-project\/jpype\/\">distribuov\u00e1no<\/a><\/noindex> pod licenc\u00ed Apache 2.0.<\/p>\n<p>Hlavn\u00ed zm\u011bny:<\/p>\n<ul>\n<li class=\"l\"> Do vol\u00e1n\u00ed metod byl p\u0159id\u00e1n cache, kter\u00fd umo\u017e\u0148uje vyhnout se rozli\u0161en\u00ed p\u0159et\u00ed\u017een\u00ed, co\u017e v\u00fdrazn\u011b sni\u017euje dopad na v\u00fdkon rozli\u0161en\u00ed metod, zejm\u00e9na pokud je stejn\u00e9 p\u0159et\u00ed\u017een\u00ed vol\u00e1no mnohokr\u00e1t, nap\u0159\u00edklad b\u011bhem b\u011bhu smy\u010dek.\n<li class=\"l\"> P\u0159en\u00e1\u0161en\u00ed seznam\u016f, n-tic a buffer\u016f do pol\u00ed Java primitiv\u016f bylo urychleno od 4 do 100kr\u00e1t, v z\u00e1vislosti na typu dat. Transformace pou\u017e\u00edv\u00e1 optimalizovan\u00e9 zpracov\u00e1n\u00ed buffer\u016f v pam\u011bti, nam\u00edsto API Sequence. Kdy\u017e se naraz\u00ed na buffer Pythonu, kontroluje se pouze prvn\u00ed prvek pro transformaci, proto\u017ee data v bufferech jsou homogenn\u00ed.\n<li class=\"l\"> Zpracov\u00e1n\u00ed operac\u00ed shutdown (realizov\u00e1no ji\u017e v JPype 1.0.0, ale bylo opomenuto p\u0159i p\u0159\u00edprav\u011b seznamu zm\u011bn). JPype nyn\u00ed vol\u00e1 shutdown proceduru JVM, kter\u00e1 se pokou\u0161\u00ed prov\u00e9st ukon\u010den\u00ed v re\u017eimu \u201egracefully\u201c. To vede k n\u011bkolika zm\u011bn\u00e1m v chov\u00e1n\u00ed. Nez\u00e1visl\u00e9 vl\u00e1kna (proxy call) nyn\u00ed mohou dr\u017eet JVM otev\u0159en\u00fd, dokud nejsou ukon\u010dena. Vol\u00e1n\u00ed proxy budou zpracov\u00e1vat shutdown, dokud nebude vol\u00e1n\u00ed ukon\u010deno, ale obdr\u017e\u00ed zpr\u00e1vu o p\u0159eru\u0161en\u00ed. Soubory se nyn\u00ed zav\u00edraj\u00ed spr\u00e1vn\u011b a zapisuj\u00ed data na disk (flush), pokud vl\u00e1kna zpracov\u00e1vaj\u00ed v\u00fdjimku spr\u00e1vn\u00fdm zp\u016fsobem. Prov\u00e1d\u011bj\u00ed se h\u00e1\u010dky pro \u010di\u0161t\u011bn\u00ed prost\u0159edk\u016f a finaliz\u00e1tory. P\u0159i vytv\u00e1\u0159en\u00ed vl\u00e1ken se volaj\u00ed AtExit h\u00e1\u010dky. P\u0159es d\u00e9mon bylo implementov\u00e1no automatick\u00e9 p\u0159ipojen\u00ed vl\u00e1ken p\u0159i pou\u017eit\u00ed JVM z Pythonu. Chybov\u00fd k\u00f3d, kter\u00fd nem\u016f\u017ee spr\u00e1vn\u011b zpracovat \u010di\u0161t\u011bn\u00ed vl\u00e1kna, pravd\u011bpodobn\u011b zamrzne p\u0159i vykon\u00e1v\u00e1n\u00ed shutdown. Dal\u0161\u00ed dokumentace je uvedena v u\u017eivatelsk\u00e9 p\u0159\u00edru\u010dce.\n<li class=\"l\"> Z\u00e1v\u011brka pro Throwable dost\u00e1vala z\u00e1v\u011brku pro Object m\u00edsto o\u010dek\u00e1van\u00e9ho v\u00fdsledku, co\u017e vedlo k podivn\u00fdm transformac\u00edm z Python t\u0159\u00edd.\n<li class=\"l\"> Opraveny p\u0159eklepy v syst\u00e9mu importu, kter\u00e9 vedou k v\u00fdstupu chyby \u201a\u201ejname\u201c not found\u2018.\n<li class=\"l\"> Zaji\u0161t\u011bno spr\u00e1vn\u00e9 propagov\u00e1n\u00ed \u201e^C\u201c v KeyboardInterrupt.\n<li class=\"l\"> Vy\u0159e\u0161en probl\u00e9m se znaky s Python 3.5.3. PySlice_Unpack byl zaveden v n\u00e1sleduj\u00edc\u00ed aktualizaci (3.5.4) a nem\u011bl b\u00fdt pou\u017e\u00edv\u00e1n.\n<li class=\"l\"> Byla vy\u0159e\u0161ena chyba s numpy.linalg.inv, kter\u00e1 vedla k p\u00e1du. Probl\u00e9m byl sledov\u00e1n k interakci vl\u00e1ken mezi JVM a n\u011bkter\u00fdmi variantami numpy. Navr\u017een\u00e9 \u0159e\u0161en\u00ed \u2014 vol\u00e1n\u00ed numpy.linalg.inv p\u0159ed spu\u0161t\u011bn\u00edm JVM.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=53469\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043d\u043e\u0432\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0441\u043b\u043e\u0439\u043a\u0438 JPype 1.0.2, \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u043f\u043e\u043b\u043d\u044b\u0439 \u0434\u043e\u0441\u0442\u0443\u043f Python-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043a \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430\u043c \u043a\u043b\u0430\u0441\u0441\u043e\u0432 \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 Java. \u041f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 JPype \u0438\u0437 Python \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u044b\u0435 \u0434\u043b\u044f Java \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438, \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u044f \u0433\u0438\u0431\u0440\u0438\u0434\u043d\u044b\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f, \u0441\u043e\u0447\u0435\u0442\u0430\u044e\u0449\u0438\u0435 \u043a\u043e\u0434 \u043d\u0430 Java \u0438 Python. \u0412 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 Jython, \u0438\u043d\u0442\u0435\u0433\u0440\u0430\u0446\u0438\u044f \u0441 Java \u0434\u043e\u0441\u0442\u0438\u0433\u0430\u0435\u0442\u0441\u044f \u043d\u0435 \u0447\u0435\u0440\u0435\u0437 \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u0430 Python \u0434\u043b\u044f JVM, \u0430 \u0447\u0435\u0440\u0435\u0437 \u0432\u0437\u0430\u0438\u043c\u043e\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-90484","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043d\u043e\u0432\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0441\u043b\u043e\u0439\u043a\u0438\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" 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