{"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\/it\/blog\/news\/obnovlenie-jpype-1-0-2-biblioteki-dlya-dostupa-k-java-klassam-iz-python","title":{"rendered":"Aggiornamento di JPype 1.0.2, una libreria per accedere a classi Java da Python.","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\">\u00c8 disponibile<\/a><\/noindex> nuovo rilascio del layer <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/jpype-project\/jpype\/\">JPype 1.0.2<\/a><\/noindex>, che consente l'accesso completo delle applicazioni Python alle librerie di classi in Java. Grazie a JPype, da Python \u00e8 possibile utilizzare librerie specifiche per Java, creando applicazioni ibride che combinano codice Java e Python. A differenza di Jython, l'integrazione con Java avviene non attraverso la creazione di una variante di Python per la JVM, ma attraverso l'interazione a livello di entrambe le macchine virtuali, utilizzando memoria condivisa. L'approccio proposto consente non solo di ottenere buone prestazioni, ma fornisce anche accesso a tutte le librerie CPython e Java. Il codice del progetto <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/jpype-project\/jpype\/\">\u00e8 distribuito<\/a><\/noindex> sotto licenza Apache 2.0.<\/p>\n<p>Variazioni principali:<\/p>\n<ul>\n<li class=\"l\"> \u00c8 stata aggiunta una cache alle chiamate ai metodi per evitare la risoluzione dei sovraccarichi, il che riduce notevolmente l'impatto sulle prestazioni della risoluzione dei metodi, specialmente se lo stesso sovraccarico viene chiamato molte volte, come durante l'esecuzione dei cicli.\n<li class=\"l\"> La trasmissione di liste, tuple e buffer in array di primitive Java \u00e8 stata accelerata da 4 a 100 volte, a seconda del tipo di dati. La conversione utilizza un'elaborazione ottimizzata dei buffer in memoria, invece del Sequence API. Quando si incontra un buffer Python, solo il primo elemento viene verificato per la conversione, poich\u00e9 i buffer di dati sono omogenei.\n<li class=\"l\"> Gestione delle operazioni di shutdown (implementata gi\u00e0 in JPype 1.0.0, ma omessa nella preparazione della lista delle modifiche). JPype ora chiama la procedura di shutdown della JVM, che cerca di uscire in modo &#171;graceful&#187;. Questo comporta alcuni cambiamenti nel comportamento. I thread non in background (chiamata proxy) possono ora mantenere aperta la JVM fino a quando non vengono completati. Le chiamate Proxy gestiranno lo shutdown fino a quando la chiamata non \u00e8 completata, ma riceveranno un messaggio di interruzione. I file vengono ora chiusi correttamente e i dati vengono scritti su disco (flush) se i thread gestiscono le eccezioni in modo appropriato. Vengono eseguiti gli hook di pulizia delle risorse e i finalizzatori. Durante la generazione dei thread vengono chiamati gli hook AtExit. C'\u00e8 un'auto-aggregazione dei thread attraverso il demone quando si utilizza la JVM da Python. Codice difettoso che non riesce a gestire correttamente la pulizia del thread potrebbe bloccarsi durante l'esecuzione dello shutdown. Ulteriore documentazione \u00e8 disponibile nel manuale dell'utente.\n<li class=\"l\"> Il wrapper per Throwable riceveva un wrapper per Object invece del risultato atteso, portando a strane conversioni da classi Python.\n<li class=\"l\"> Correzioni di errori di battitura nel sistema di importazione, che portano all'errore &#8216;&#187;jname&#187; not found&#8217;.\n<li class=\"l\"> Assicurato il corretto passaggio del &#171;^C&#187; in KeyboardInterrupt.\n<li class=\"l\"> Risolto un problema con i simboli da Python 3.5.3. PySlice_Unpack \u00e8 stato introdotto nella successiva versione patch (3.5.4) e non doveva essere utilizzato.\n<li class=\"l\"> Risolta un'errore con numpy.linalg.inv che portava al crash. Il problema \u00e8 stato tracciato all'interazione dei thread tra la JVM e alcune versioni di numpy. La soluzione proposta \u00e8 di chiamare numpy.linalg.inv prima di avviare la JVM.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <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 5.0.1.1 - 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\" \/>\n\t<meta name=\"author\" content=\"Yuri 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