{"id":34808,"date":"2025-11-22T08:40:55","date_gmt":"2025-11-22T05:40:55","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/?p=34808"},"modified":"2025-11-22T08:40:55","modified_gmt":"2025-11-22T05:40:55","slug":"java-timer-ve-timertask-ile-zamanlanmis-gorevler-kapsamli-bir-rehber","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/java-timer-ve-timertask-ile-zamanlanmis-gorevler-kapsamli-bir-rehber\/","title":{"rendered":"Java Timer ve TimerTask ile Zamanlanm\u0131\u015f G\u00f6revler: Kapsaml\u0131 Bir Rehber"},"content":{"rendered":"

<\/p>\n

Java Timer ve TimerTask ile Zamanlanm\u0131\u015f G\u00f6revler: Kapsaml\u0131 Bir Rehber<\/h2>\n

Zamanlanm\u0131\u015f g\u00f6revler, modern yaz\u0131l\u0131m uygulamalar\u0131n\u0131n ayr\u0131lmaz bir par\u00e7as\u0131d\u0131r. Belirli aral\u0131klarla veya \u00f6nceden tan\u0131mlanm\u0131\u015f bir zamanda otomatik olarak \u00e7al\u0131\u015ft\u0131r\u0131lmas\u0131 gereken i\u015flemler, uygulamalar\u0131n verimlili\u011fini, bak\u0131m\u0131n\u0131 ve kullan\u0131c\u0131 deneyimini \u00f6nemli \u00f6l\u00e7\u00fcde etkiler. Java platformunda, bu t\u00fcr g\u00f6revleri y\u00f6netmek i\u00e7in \u00e7e\u015fitli mekanizmalar bulunur. Bu mekanizmalardan en k\u00f6kl\u00fc ve temel olanlar\u0131ndan ikisi java.util.Timer<\/code> ve java.util.TimerTask<\/code> s\u0131n\u0131flar\u0131d\u0131r. Bu makale, bu iki s\u0131n\u0131f\u0131n derinlemesine incelenmesini, nas\u0131l kullan\u0131ld\u0131klar\u0131n\u0131, sa\u011flad\u0131klar\u0131 faydalar\u0131, s\u0131n\u0131rlamalar\u0131n\u0131 ve modern alternatiflerini kapsaml\u0131 bir \u015fekilde ele alacakt\u0131r.<\/p>\n

Zamanlanm\u0131\u015f G\u00f6revlere Neden \u0130htiya\u00e7 Duyar\u0131z?<\/h3>\n

Uygulamalar geli\u015ftik\u00e7e, manuel m\u00fcdahale gerektirmeyen, arka planda otomatik olarak y\u00fcr\u00fct\u00fclen i\u015flemlere olan ihtiya\u00e7 da artar. Zamanlanm\u0131\u015f g\u00f6revler, bu otomasyonu sa\u011flaman\u0131n temel yollar\u0131ndan biridir. \u0130\u015fte zamanlanm\u0131\u015f g\u00f6revlere neden ihtiya\u00e7 duydu\u011fumuza dair baz\u0131 yayg\u0131n senaryolar:<\/p>\n

* Veritaban\u0131 Bak\u0131m\u0131 ve Yedekleme:<\/strong> Belirli aral\u0131klarla veritaban\u0131 temizli\u011fi yapmak, indeksleri yeniden olu\u015fturmak veya d\u00fczenli yedeklemeler almak, veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc ve sistem performans\u0131n\u0131 korumak i\u00e7in hayati \u00f6neme sahiptir.
\n* Log Y\u00f6netimi:<\/strong> Uygulama log dosyalar\u0131 zamanla b\u00fcy\u00fcyebilir. Eski loglar\u0131 silmek, s\u0131k\u0131\u015ft\u0131rmak veya ar\u015fivlemek, disk alan\u0131n\u0131 y\u00f6netmek ve performans sorunlar\u0131n\u0131 \u00f6nlemek i\u00e7in otomatikle\u015ftirilmelidir.
\n* Rapor Olu\u015fturma ve G\u00f6nderme:<\/strong> G\u00fcnl\u00fck, haftal\u0131k veya ayl\u0131k sat\u0131\u015f raporlar\u0131, sistem durumu raporlar\u0131 gibi bilgilerin belirli zamanlarda otomatik olarak olu\u015fturulup ilgili ki\u015filere e-posta ile g\u00f6nderilmesi i\u015f s\u00fcre\u00e7lerini kolayla\u015ft\u0131r\u0131r.
\n* \u00d6nbellek (Cache) Yenileme:<\/strong> Veritaban\u0131ndan veya harici servislerden gelen verilerin \u00f6nbellekte tutulmas\u0131 performans\u0131 art\u0131r\u0131r. Ancak bu \u00f6nbelleklerin belirli aral\u0131klarla g\u00fcncellenmesi veya temizlenmesi gerekir.
\n* Bildirimler ve Hat\u0131rlat\u0131c\u0131lar:<\/strong> Kullan\u0131c\u0131lara belirli bir olaydan \u00f6nce veya sonra hat\u0131rlat\u0131c\u0131lar g\u00f6ndermek (\u00f6rne\u011fin, randevu hat\u0131rlat\u0131c\u0131lar\u0131, \u00f6deme son tarihleri) veya sistem y\u00f6neticilerine kritik durumlar hakk\u0131nda bildirimler iletmek.
\n* Veri Senkronizasyonu:<\/strong> Farkl\u0131 sistemler veya servisler aras\u0131nda veri senkronizasyonunu belirli aral\u0131klarla ger\u00e7ekle\u015ftirmek.
\n* Durum Kontrol\u00fc (Health Checks):<\/strong> Uygulaman\u0131n veya ba\u011f\u0131ml\u0131 servislerin sa\u011fl\u0131\u011f\u0131n\u0131 d\u00fczenli olarak kontrol etmek ve olas\u0131 sorunlar\u0131 erken tespit etmek.<\/p>\n

Bu senaryolar\u0131n her biri, Java’n\u0131n Timer<\/code> ve TimerTask<\/code> s\u0131n\u0131flar\u0131 kullan\u0131larak veya daha modern alternatiflerle etkin bir \u015fekilde y\u00f6netilebilir.<\/p>\n

java.util.Timer<\/code> ve java.util.TimerTask<\/code> Temelleri<\/h3>\n

Java’da zamanlanm\u0131\u015f g\u00f6revlerin temelini olu\u015fturan Timer<\/code> ve TimerTask<\/code> s\u0131n\u0131flar\u0131, JDK 1.3 s\u00fcr\u00fcm\u00fcnden bu yana mevcuttur. Basit ve tek i\u015f par\u00e7ac\u0131kl\u0131 zamanlama ihtiya\u00e7lar\u0131 i\u00e7in uygun bir \u00e7\u00f6z\u00fcm sunarlar.<\/p>\n

TimerTask<\/code> S\u0131n\u0131f\u0131<\/h4>\n

TimerTask<\/code>, belirli bir zamanda veya tekrarlayan bir \u015fekilde y\u00fcr\u00fct\u00fclmesi gereken bir g\u00f6revi temsil eden soyut bir s\u0131n\u0131ft\u0131r. Runnable<\/code> aray\u00fcz\u00fcn\u00fc uygular, bu da asl\u0131nda bir i\u015f par\u00e7ac\u0131\u011f\u0131 \u00fczerinde \u00e7al\u0131\u015ft\u0131r\u0131labilecek bir g\u00f6rev oldu\u011funu g\u00f6sterir.<\/p>\n

* run()<\/code> Metodu:<\/strong> TimerTask<\/code> s\u0131n\u0131f\u0131n\u0131n en \u00f6nemli metodu run()<\/code> metodudur. Zamanlanm\u0131\u015f g\u00f6revin t\u00fcm mant\u0131\u011f\u0131 bu metodun i\u00e7ine yaz\u0131l\u0131r. Kendi \u00f6zel g\u00f6revinizi olu\u015fturmak i\u00e7in TimerTask<\/code> s\u0131n\u0131f\u0131n\u0131 geni\u015fletmeli ve run()<\/code> metodunu override etmelisiniz.<\/p>\n

\u00d6rnek TimerTask<\/code> Uygulamas\u0131:<\/strong><\/p>\n

import java.util.TimerTask;\nimport java.util.Date;\n\npublic class MyTask extends TimerTask {\n    private String taskName;\n\n    public MyTask(String name) {\n        this.taskName = name;\n    }\n\n    @Override\n    public void run() {\n        System.out.println(taskName + \" g\u00f6revi \u00e7al\u0131\u015ft\u0131! Zaman: \" + new Date());\n        \/\/ G\u00f6revle ilgili yap\u0131lacak i\u015flemler burada yer al\u0131r.\n        \/\/ \u00d6rne\u011fin: veritaban\u0131 yedekleme, log temizleme vb.\n    }\n}<\/code><\/pre>\n
Bu \u00f6rnekte, MyTask<\/code> s\u0131n\u0131f\u0131 TimerTask<\/code>‘\u0131 geni\u015fletir ve run()<\/code> metodunda basit bir mesaj yazd\u0131r\u0131r. Ger\u00e7ek uygulamalarda bu metodun i\u00e7i daha karma\u015f\u0131k i\u015f mant\u0131\u011f\u0131yla doldurulacakt\u0131r.<\/p>\n
Timer<\/code> S\u0131n\u0131f\u0131<\/h4>\n
Timer<\/code> s\u0131n\u0131f\u0131, TimerTask<\/code> nesnelerini zamanlamak ve y\u00fcr\u00fctmek i\u00e7in kullan\u0131lan bir yard\u0131mc\u0131 programd\u0131r. Kendi arka plan i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 (Timer<\/code> i\u015f par\u00e7ac\u0131\u011f\u0131) kullanarak g\u00f6revleri s\u0131ral\u0131 bir \u015fekilde y\u00fcr\u00fct\u00fcr.<\/p>\n
*   Yap\u0131c\u0131 Metotlar:<\/strong>
\n    *   Timer()<\/code>: Varsay\u0131lan bir Timer<\/code> nesnesi olu\u015fturur. Bu Timer<\/code> taraf\u0131ndan olu\u015fturulan i\u015f par\u00e7ac\u0131\u011f\u0131, JVM’in kapanmas\u0131n\u0131 engelleyen bir kullan\u0131c\u0131 i\u015f par\u00e7ac\u0131\u011f\u0131d\u0131r (non-daemon thread).
\n    *   Timer(boolean isDaemon)<\/code>: Bir Timer<\/code> nesnesi olu\u015fturur ve i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131n daemon olup olmad\u0131\u011f\u0131n\u0131 belirtmenizi sa\u011flar. E\u011fer isDaemon<\/code> true<\/code> ise, i\u015f par\u00e7ac\u0131\u011f\u0131 bir daemon i\u015f par\u00e7ac\u0131\u011f\u0131 olur. Daemon i\u015f par\u00e7ac\u0131klar\u0131, JVM’de ba\u015fka kullan\u0131c\u0131 i\u015f par\u00e7ac\u0131\u011f\u0131 kalmad\u0131\u011f\u0131nda JVM’in kapanmas\u0131n\u0131 engellemez. Bu, uygulaman\u0131z\u0131n ana i\u015f par\u00e7ac\u0131klar\u0131 bitti\u011finde otomatik olarak kapanmas\u0131n\u0131 istedi\u011finiz durumlarda kullan\u0131\u015fl\u0131d\u0131r.
\n    *   Timer(String name)<\/code>: Belirtilen isimle bir Timer<\/code> nesnesi olu\u015fturur. \u0130\u015f par\u00e7ac\u0131\u011f\u0131 non-daemon’d\u0131r.
\n    *   Timer(String name, boolean isDaemon)<\/code>: Belirtilen isimle ve daemon durumuyla bir Timer<\/code> nesnesi olu\u015fturur.<\/p>\n
*   Zamanlama Metotlar\u0131:<\/strong> Timer<\/code> s\u0131n\u0131f\u0131, TimerTask<\/code>‘lar\u0131 \u00e7e\u015fitli \u015fekillerde zamanlamak i\u00e7in bir dizi schedule<\/code> metodu sunar:<\/p>\n
       schedule(TimerTask task, long delay)<\/code>: Belirtilen TimerTask<\/code>‘\u0131, belirtilen milisaniye cinsinden gecikmeden sonra <\/em>bir kez* y\u00fcr\u00fct\u00fcr.
\n        *   task<\/code>: Y\u00fcr\u00fct\u00fclecek g\u00f6rev.
\n        *   delay<\/code>: G\u00f6revin ne kadar gecikmeyle ba\u015flayaca\u011f\u0131 (milisaniye).<\/p>\n
       schedule(TimerTask task, Date time)<\/code>: Belirtilen TimerTask<\/code>‘\u0131, belirtilen Date<\/code> nesnesinin temsil etti\u011fi zamanda <\/em>bir kez* y\u00fcr\u00fct\u00fcr.
\n        *   task<\/code>: Y\u00fcr\u00fct\u00fclecek g\u00f6rev.
\n        *   time<\/code>: G\u00f6revin y\u00fcr\u00fct\u00fclece\u011fi kesin zaman.<\/p>\n
       schedule(TimerTask task, long delay, long period)<\/code>: Belirtilen TimerTask<\/code>‘\u0131, belirtilen milisaniye cinsinden gecikmeden sonra ba\u015flat\u0131r ve daha sonra belirtilen period<\/code> milisaniye aral\u0131klarla <\/em>tekrarlayarak* y\u00fcr\u00fct\u00fcr. Bu, sabit gecikmeli (fixed-delay)<\/strong> bir zamanlamad\u0131r. Yani, bir g\u00f6revin tamamlanmas\u0131ndan sonra period<\/code> kadar beklenir ve sonra bir sonraki g\u00f6rev ba\u015flat\u0131l\u0131r.
\n        *   task<\/code>: Y\u00fcr\u00fct\u00fclecek g\u00f6rev.
\n        *   delay<\/code>: \u0130lk g\u00f6revin ne kadar gecikmeyle ba\u015flayaca\u011f\u0131 (milisaniye).
\n        *   period<\/code>: G\u00f6revlerin birbirini takip eden y\u00fcr\u00fctmeleri aras\u0131ndaki gecikme (milisaniye).<\/p>\n
       schedule(TimerTask task, Date firstTime, long period)<\/code>: Belirtilen TimerTask<\/code>‘\u0131, belirtilen firstTime<\/code> tarihinde ba\u015flat\u0131r ve daha sonra belirtilen period<\/code> milisaniye aral\u0131klarla <\/em>tekrarlayarak* y\u00fcr\u00fct\u00fcr. Bu da sabit gecikmeli (fixed-delay)<\/strong> bir zamanlamad\u0131r.
\n        *   task<\/code>: Y\u00fcr\u00fct\u00fclecek g\u00f6rev.
\n        *   firstTime<\/code>: \u0130lk g\u00f6revin y\u00fcr\u00fct\u00fclece\u011fi kesin zaman.
\n        *   period<\/code>: G\u00f6revlerin birbirini takip eden y\u00fcr\u00fctmeleri aras\u0131ndaki gecikme (milisaniye).<\/p>\n
       scheduleAtFixedRate(TimerTask task, long delay, long period)<\/code>: Belirtilen TimerTask<\/code>‘\u0131, belirtilen milisaniye cinsinden gecikmeden sonra ba\u015flat\u0131r ve daha sonra belirtilen period<\/code> milisaniye aral\u0131klarla <\/em>sabit bir oranda* y\u00fcr\u00fct\u00fcr. Bu, sabit oranl\u0131 (fixed-rate)<\/strong> bir zamanlamad\u0131r. Yani, g\u00f6revlerin ba\u015flang\u0131\u00e7 zamanlar\u0131, \u00f6nceki g\u00f6revin ne kadar s\u00fcrd\u00fc\u011f\u00fcnden ba\u011f\u0131ms\u0131z olarak, m\u00fcmk\u00fcn oldu\u011funca d\u00fczenli aral\u0131klarla tutulmaya \u00e7al\u0131\u015f\u0131l\u0131r. E\u011fer bir g\u00f6rev period<\/code>‘dan daha uzun s\u00fcrerse, bir sonraki g\u00f6rev hemen bir \u00f6nceki g\u00f6rev biter bitmez ba\u015flar.
\n        *   task<\/code>: Y\u00fcr\u00fct\u00fclecek g\u00f6rev.
\n        *   delay<\/code>: \u0130lk g\u00f6revin ne kadar gecikmeyle ba\u015flayaca\u011f\u0131 (milisaniye).
\n        *   period<\/code>: G\u00f6revlerin birbirini takip eden ba\u015flang\u0131\u00e7 zamanlar\u0131 aras\u0131ndaki ideal aral\u0131k (milisaniye).<\/p>\n
       scheduleAtFixedRate(TimerTask task, Date firstTime, long period)<\/code>: Belirtilen TimerTask<\/code>‘\u0131, belirtilen firstTime<\/code> tarihinde ba\u015flat\u0131r ve daha sonra belirtilen period<\/code> milisaniye aral\u0131klarla <\/em>sabit bir oranda* y\u00fcr\u00fct\u00fcr. Bu da sabit oranl\u0131 (fixed-rate)<\/strong> bir zamanlamad\u0131r.
\n        *   task<\/code>: Y\u00fcr\u00fct\u00fclecek g\u00f6rev.
\n        *   firstTime<\/code>: \u0130lk g\u00f6revin y\u00fcr\u00fct\u00fclece\u011fi kesin zaman.
\n        *   period<\/code>: G\u00f6revlerin birbirini takip eden ba\u015flang\u0131\u00e7 zamanlar\u0131 aras\u0131ndaki ideal aral\u0131k (milisaniye).<\/p>\n
*   Di\u011fer Metotlar:<\/strong>
\n    *   cancel()<\/code>: Bu Timer<\/code> taraf\u0131ndan zamanlanm\u0131\u015f t\u00fcm g\u00f6revleri sonland\u0131r\u0131r ve Timer<\/code>‘\u0131n i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 sonland\u0131r\u0131r. Timer<\/code>‘\u0131 iptal ettikten sonra yeni g\u00f6revler zamanlanamaz.
\n    *   purge()<\/code>: \u0130ptal edilmi\u015f g\u00f6revleri Timer<\/code>‘\u0131n g\u00f6rev kuyru\u011fundan kald\u0131r\u0131r. Bu, haf\u0131za kullan\u0131m\u0131n\u0131 optimize etmek i\u00e7in kullan\u0131labilir, ancak genellikle otomatik olarak y\u00f6netilir.<\/p>\n
schedule<\/code> ve scheduleAtFixedRate<\/code> Aras\u0131ndaki Farklar<\/h3>\n
Timer<\/code> s\u0131n\u0131f\u0131n\u0131n en s\u0131k kar\u0131\u015ft\u0131r\u0131lan y\u00f6nlerinden biri schedule<\/code> (sabit gecikmeli) ve scheduleAtFixedRate<\/code> (sabit oranl\u0131) metotlar\u0131 aras\u0131ndaki farkt\u0131r. Bu fark, \u00f6zellikle g\u00f6revlerin y\u00fcr\u00fctme s\u00fcresi period<\/code> de\u011ferinden uzun oldu\u011funda kritik hale gelir.<\/p>\n
*   schedule<\/code> (Sabit Gecikmeli – Fixed-Delay):<\/strong>
\n       Bu metodun amac\u0131, <\/em>bir g\u00f6revin tamamlanmas\u0131ndan sonra* belirli bir period<\/code> kadar bekleyip bir sonraki g\u00f6revi ba\u015flatmakt\u0131r.
\n    *   G\u00f6revlerin y\u00fcr\u00fctme s\u00fcreleri ne olursa olsun, bir g\u00f6rev bittikten sonraki gecikme (period<\/code>) sabittir.
\n    *   E\u011fer bir g\u00f6rev period<\/code>‘dan daha uzun s\u00fcrerse, sonraki g\u00f6rev daha ge\u00e7 ba\u015flar. Bu, g\u00f6revlerin “kaymas\u0131na” neden olur; yani, planlanan mutlak zamanlar\u0131ndan daha ge\u00e7 \u00e7al\u0131\u015f\u0131rlar.
\n    *   \u00d6rnek:<\/strong> G\u00f6rev 5 saniye s\u00fcrs\u00fcn, period<\/code> 2 saniye olsun.
\n        1.  G\u00f6rev 0. saniyede ba\u015flar, 5. saniyede biter.
\n        2.  period<\/code> (2 saniye) beklendikten sonra, bir sonraki g\u00f6rev 5 + 2 = 7. saniyede ba\u015flar.
\n        3.  Bu g\u00f6rev de 5 saniye s\u00fcrer, 12. saniyede biter.
\n        4.  Bir sonraki g\u00f6rev 12 + 2 = 14. saniyede ba\u015flar.
\n    *   Kullan\u0131m Senaryosu:<\/strong> Bir g\u00f6revin di\u011ferini belirli bir gecikmeyle takip etmesi gereken durumlar. \u00d6rne\u011fin, her 5 dakikada bir veritaban\u0131n\u0131 kontrol et, ancak kontrol i\u015flemi uzun s\u00fcrerse, bir sonraki kontrol\u00fcn de o uzun i\u015flem bittikten 5 dakika sonra ba\u015flamas\u0131.<\/p>\n
*   scheduleAtFixedRate<\/code> (Sabit Oranl\u0131 – Fixed-Rate):<\/strong>
\n       Bu metodun amac\u0131, g\u00f6revlerin <\/em>planlanan ba\u015flang\u0131\u00e7 zamanlar\u0131 aras\u0131nda* belirli bir period<\/code>‘u korumaya \u00e7al\u0131\u015fmakt\u0131r.
\n    *   E\u011fer bir g\u00f6rev period<\/code>‘dan daha k\u0131sa s\u00fcrerse, bir sonraki g\u00f6rev planlanan zamanda ba\u015flar.
\n       E\u011fer bir g\u00f6rev period<\/code>‘dan daha uzun s\u00fcrerse, bir sonraki g\u00f6rev, bir \u00f6nceki g\u00f6rev biter bitmez hemen ba\u015flar. Bu durumda, period<\/code> de\u011feri g\u00f6revler aras\u0131nda de\u011fil, g\u00f6revlerin <\/em>planlanan ba\u015flang\u0131\u00e7 zamanlar\u0131* aras\u0131nda korunmaya \u00e7al\u0131\u015f\u0131l\u0131r. G\u00f6revler “yakalamaya” \u00e7al\u0131\u015f\u0131r.
\n    *   \u00d6rnek:<\/strong> G\u00f6rev 5 saniye s\u00fcrs\u00fcn, period<\/code> 2 saniye olsun.
\n        1.  G\u00f6rev 0. saniyede ba\u015flar, 5. saniyede biter.
\n        2.  \u0130kinci g\u00f6rev 2. saniyede ba\u015flamal\u0131yd\u0131 (0 + 2). Ancak ilk g\u00f6rev hala \u00e7al\u0131\u015f\u0131yor. \u0130lk g\u00f6rev 5. saniyede biter bitmez, ikinci g\u00f6rev hemen 5. saniyede ba\u015flar.
\n        3.  \u00dc\u00e7\u00fcnc\u00fc g\u00f6rev 4. saniyede ba\u015flamal\u0131yd\u0131 (0 + 2 + 2). Ama ikinci g\u00f6rev 5. saniyede ba\u015flad\u0131 ve 10. saniyede bitti (5+5). Bu durumda \u00fc\u00e7\u00fcnc\u00fc g\u00f6rev 10. saniyede ba\u015flar.
\n    *   Kullan\u0131m Senaryosu:<\/strong> Belirli bir frekansta \u00e7al\u0131\u015fmas\u0131 gereken, ancak her bir g\u00f6revin tamamlanma s\u00fcresinin kesinlikle sabit olmad\u0131\u011f\u0131 durumlar. \u00d6rne\u011fin, her 1 dakikada bir sens\u00f6r verisi oku. Okuma i\u015flemi bazen 30 saniye s\u00fcrer, bazen 70 saniye. E\u011fer 70 saniye s\u00fcrerse, bir sonraki okuma hemen bir \u00f6nceki biter bitmez ba\u015flas\u0131n ki veri kayb\u0131 olmas\u0131n. Ancak dikkatli olunmal\u0131, e\u011fer g\u00f6rev s\u00fcrekli period<\/code>‘dan uzun s\u00fcrerse, g\u00f6revler birikerek sistem kaynaklar\u0131n\u0131 t\u00fcketebilir.<\/p>\n
\u00d6zet Tablo:<\/strong><\/p>\n
| \u00d6zellik                 | schedule<\/code> (Fixed-Delay)                                  | scheduleAtFixedRate<\/code> (Fixed-Rate)                                |
\n| :———————- | :——————————————————– | :—————————————————————- |
\n| Gecikme Referans\u0131<\/strong>   | \u00d6nceki g\u00f6revin tamamlanmas\u0131ndan sonra<\/em> period<\/code> kadar.  | \u00d6nceki g\u00f6revin planlanan ba\u015flang\u0131\u00e7 zaman\u0131ndan sonra<\/em> period<\/code> kadar. |
\n| G\u00f6rev S\u00fcresi > Period<\/strong>| G\u00f6revler planlanan zamanlar\u0131ndan kayar<\/em>.                  | G\u00f6revler, \u00f6nceki g\u00f6rev biter bitmez hemen ba\u015flar<\/em> (yakalamaya \u00e7al\u0131\u015f\u0131r). |
\n| G\u00f6rev S\u00fcresi < Period<\/strong>| G\u00f6rev bittikten sonra period<\/code> kadar beklenir.            | G\u00f6rev planlanan zamanda ba\u015flar.                                   |
\n| Ama\u00e7<\/strong>                | G\u00f6revler aras\u0131 sabit bo\u015fluk sa\u011flamak.                     | G\u00f6revlerin m\u00fcmk\u00fcn oldu\u011funca d\u00fczenli bir frekansta ba\u015flamas\u0131n\u0131 sa\u011flamak. |<\/p>\n
Pratik Uygulama \u00d6rnekleri<\/h3>\n
\u015eimdi Timer<\/code> ve TimerTask<\/code> s\u0131n\u0131flar\u0131n\u0131 kullanarak \u00e7e\u015fitli zamanlama senaryolar\u0131n\u0131 inceleyelim.<\/p>\n
Basit Tek Seferlik G\u00f6rev<\/h4>\n
Bir g\u00f6revin belirli bir gecikmeden sonra veya belirli bir tarihte bir kez \u00e7al\u0131\u015ft\u0131r\u0131lmas\u0131.<\/p>\n
import java.util.Timer;\nimport java.util.TimerTask;\nimport java.util.Date;\nimport java.text.SimpleDateFormat;\n\npublic class OneTimeTaskExample {\n    public static void main(String[] args) {\n        Timer timer = new Timer(); \/\/ Varsay\u0131lan non-daemon timer\n\n        \/\/ 1. Belirli bir gecikmeden sonra tek seferlik g\u00f6rev\n        TimerTask delayedTask = new TimerTask() {\n            @Override\n            public void run() {\n                System.out.println(\"Gecikmeli g\u00f6rev \u00e7al\u0131\u015ft\u0131! \" + new Date());\n                timer.cancel(); \/\/ G\u00f6rev bittikten sonra timer'\u0131 iptal et\n            }\n        };\n        \/\/ 3 saniye (3000 ms) sonra \u00e7al\u0131\u015ft\u0131r\n        timer.schedule(delayedTask, 3000);\n\n        \/\/ 2. Belirli bir tarihte tek seferlik g\u00f6rev\n        Timer timer2 = new Timer(); \/\/ Ba\u015fka bir timer \u00f6rne\u011fi\n\n        \/\/ \u015eimdiki zamandan 5 saniye sonras\u0131 i\u00e7in bir tarih belirleyelim\n        Date futureTime = new Date(System.currentTimeMillis() + 5000);\n        SimpleDateFormat sdf = new SimpleDateFormat(\"HH:mm:ss\");\n\n        TimerTask specificTimeTask = new TimerTask() {\n            @Override\n            public void run() {\n                System.out.println(\"Belirli zamanda g\u00f6rev \u00e7al\u0131\u015ft\u0131! \" + sdf.format(new Date()));\n                timer2.cancel(); \/\/ G\u00f6rev bittikten sonra timer'\u0131 iptal et\n            }\n        };\n        System.out.println(\"Belirli zamanda g\u00f6rev \" + sdf.format(futureTime) + \" i\u00e7in planland\u0131.\");\n        timer2.schedule(specificTimeTask, futureTime);\n\n        System.out.println(\"Ana program devam ediyor...\");\n    }\n}<\/code><\/pre>\n
Bu \u00f6rnekte, delayedTask<\/code> 3 saniye sonra, specificTimeTask<\/code> ise 5 saniye sonra belirlenen mutlak zamanda \u00e7al\u0131\u015facakt\u0131r. Her g\u00f6rev bittikten sonra kendi Timer<\/code> nesnesini iptal ederek JVM’in kapanmas\u0131na izin veriyoruz.<\/p>\n
Tekrarlayan G\u00f6rev (Fixed-Delay)<\/h4>\n
schedule(TimerTask task, long delay, long period)<\/code> kullanarak sabit gecikmeli bir g\u00f6rev planlama.<\/p>\n
import java.util.Timer;\nimport java.util.TimerTask;\nimport java.util.Date;\n\npublic class FixedDelayTaskExample {\n    public static void main(String[] args) {\n        Timer timer = new Timer();\n\n        TimerTask fixedDelayTask = new TimerTask() {\n            private int counter = 0;\n            @Override\n            public void run() {\n                long startTime = System.currentTimeMillis();\n                System.out.println(\"Fixed-Delay g\u00f6rev (\" + (++counter) + \") ba\u015flad\u0131: \" + new Date());\n                try {\n                    \/\/ G\u00f6revin uzun s\u00fcrmesini sim\u00fcle edelim (\u00f6rne\u011fin, 3 saniye)\n                    Thread.sleep(3000);\n                } catch (InterruptedException e) {\n                    Thread.currentThread().interrupt();\n                    System.err.println(\"G\u00f6rev kesintiye u\u011frad\u0131.\");\n                }\n                long endTime = System.currentTimeMillis();\n                System.out.println(\"Fixed-Delay g\u00f6rev (\" + counter + \") bitti: \" + new Date() +\n                                   \", S\u00fcre: \" + (endTime - startTime) + \"ms\");\n\n                if (counter >= 5) { \/\/ 5 kez \u00e7al\u0131\u015ft\u0131ktan sonra g\u00f6revi ve timer'\u0131 iptal et\n                    this.cancel(); \/\/ Sadece bu g\u00f6revi iptal eder\n                    timer.cancel(); \/\/ Timer'daki t\u00fcm g\u00f6revleri ve timer i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 iptal eder\n                    System.out.println(\"Fixed-Delay timer iptal edildi.\");\n                }\n            }\n        };\n\n        \/\/ 1 saniye gecikmeyle ba\u015fla, her 2 saniyede bir (g\u00f6rev bittikten sonra) tekrarla\n        System.out.println(\"Fixed-Delay g\u00f6rev planland\u0131. \u0130lk g\u00f6rev 1 sn sonra, sonraki her g\u00f6rev bir \u00f6nceki bittikten 2 sn sonra ba\u015flayacak.\");\n        timer.schedule(fixedDelayTask, 1000, 2000);\n\n        \/\/ Ana program\u0131n hemen bitmemesi i\u00e7in biraz bekleme\n        try {\n            Thread.sleep(20000); \/\/ 20 saniye bekle\n        } catch (InterruptedException e) {\n            Thread.currentThread().interrupt();\n        }\n    }\n}<\/code><\/pre>\n
Bu \u00f6rnekte, g\u00f6rev 3 saniye s\u00fcrd\u00fc\u011f\u00fc halde, period<\/code> 2 saniye olarak belirlenmi\u015ftir. schedule<\/code> metodu kullan\u0131ld\u0131\u011f\u0131 i\u00e7in, her g\u00f6rev bittikten sonra 2 saniye beklenir ve sonra bir sonraki g\u00f6rev ba\u015flar. Bu, g\u00f6revlerin planlanan mutlak zamanlar\u0131ndan “kaymas\u0131na” neden olacakt\u0131r.<\/p>\n
Tekrarlayan G\u00f6rev (Fixed-Rate)<\/h4>\n
scheduleAtFixedRate(TimerTask task, long delay, long period)<\/code> kullanarak sabit oranl\u0131 bir g\u00f6rev planlama.<\/p>\n
import java.util.Timer;\nimport java.util.TimerTask;\nimport java.util.Date;\n\npublic class FixedRateTaskExample {\n    public static void main(String[] args) {\n        Timer timer = new Timer();\n\n        TimerTask fixedRateTask = new TimerTask() {\n            private int counter = 0;\n            @Override\n            public void run() {\n                long startTime = System.currentTimeMillis();\n                System.out.println(\"Fixed-Rate g\u00f6rev (\" + (++counter) + \") ba\u015flad\u0131: \" + new Date());\n                try {\n                    \/\/ G\u00f6revin uzun s\u00fcrmesini sim\u00fcle edelim (\u00f6rne\u011fin, 3 saniye)\n                    Thread.sleep(3000);\n                } catch (InterruptedException e) {\n                    Thread.currentThread().interrupt();\n                    System.err.println(\"G\u00f6rev kesintiye u\u011frad\u0131.\");\n                }\n                long endTime = System.currentTimeMillis();\n                System.out.println(\"Fixed-Rate g\u00f6rev (\" + counter + \") bitti: \" + new Date() +\n                                   \", S\u00fcre: \" + (endTime - startTime) + \"ms\");\n\n                if (counter >= 5) { \/\/ 5 kez \u00e7al\u0131\u015ft\u0131ktan sonra g\u00f6revi ve timer'\u0131 iptal et\n                    this.cancel();\n                    timer.cancel();\n                    System.out.println(\"Fixed-Rate timer iptal edildi.\");\n                }\n            }\n        };\n\n        \/\/ 1 saniye gecikmeyle ba\u015fla, her 2 saniyede bir (planlanan ba\u015flang\u0131\u00e7) tekrarla\n        System.out.println(\"Fixed-Rate g\u00f6rev planland\u0131. \u0130lk g\u00f6rev 1 sn sonra, sonraki her g\u00f6rev planlanan ba\u015flang\u0131\u00e7tan 2 sn sonra ba\u015flayacak.\");\n        timer.scheduleAtFixedRate(fixedRateTask, 1000, 2000);\n\n        \/\/ Ana program\u0131n hemen bitmemesi i\u00e7in biraz bekleme\n        try {\n            Thread.sleep(20000); \/\/ 20 saniye bekle\n        } catch (InterruptedException e) {\n            Thread.currentThread().interrupt();\n        }\n    }\n}<\/code><\/pre>\n
Bu \u00f6rnekte de g\u00f6rev 3 saniye s\u00fcrerken, period<\/code> 2 saniyedir. scheduleAtFixedRate<\/code> kullan\u0131ld\u0131\u011f\u0131 i\u00e7in, bir g\u00f6rev period<\/code>‘dan daha uzun s\u00fcrd\u00fc\u011f\u00fcnde, bir sonraki g\u00f6rev hemen bir \u00f6nceki biter bitmez ba\u015flar. Bu, g\u00f6revlerin planlanan zaman \u00e7izelgesini “yakalamaya” \u00e7al\u0131\u015ft\u0131\u011f\u0131 anlam\u0131na gelir ve e\u011fer g\u00f6rev s\u00fcrekli period<\/code>‘dan uzun s\u00fcrerse, g\u00f6revler aras\u0131nda neredeyse hi\u00e7 bo\u015fluk kalmaz veya hatta g\u00f6revler kuyrukta birikebilir.<\/p>\n
Timer’\u0131 \u0130ptal Etme<\/h4>\n
timer.cancel()<\/code> metodunun nas\u0131l kullan\u0131laca\u011f\u0131 ve neden \u00f6nemli oldu\u011fu.<\/p>\n
import java.util.Timer;\nimport java.util.TimerTask;\nimport java.util.Date;\n\npublic class CancelTimerExample {\n    public static void main(String[] args) {\n        Timer timer = new Timer();\n\n        TimerTask task1 = new TimerTask() {\n            @Override\n            public void run() {\n                System.out.println(\"G\u00f6rev 1 \u00e7al\u0131\u015ft\u0131: \" + new Date());\n            }\n        };\n\n        TimerTask task2 = new TimerTask() {\n            @Override\n            public void run() {\n                System.out.println(\"G\u00f6rev 2 \u00e7al\u0131\u015ft\u0131: \" + new Date());\n            }\n        };\n\n        timer.schedule(task1, 1000, 1000); \/\/ Her saniye \u00e7al\u0131\u015f\n        timer.schedule(task2, 5000); \/\/ 5 saniye sonra bir kez \u00e7al\u0131\u015f\n\n        System.out.println(\"Timer ba\u015flad\u0131. 7 saniye sonra iptal edilecek.\");\n\n        try {\n            Thread.sleep(7000); \/\/ 7 saniye bekle\n        } catch (InterruptedException e) {\n            Thread.currentThread().interrupt();\n        }\n\n        timer.cancel(); \/\/ Timer'\u0131 ve t\u00fcm zamanlanm\u0131\u015f g\u00f6revleri iptal et\n        System.out.println(\"Timer iptal edildi. Daha fazla g\u00f6rev \u00e7al\u0131\u015fmayacak.\");\n\n        \/\/ \u0130ptal edilmi\u015f bir timer'a yeni g\u00f6rev eklemeye \u00e7al\u0131\u015fmak IllegalStateException f\u0131rlat\u0131r\n        try {\n            timer.schedule(new TimerTask() {\n                @Override\n                public void run() {\n                    System.out.println(\"Bu g\u00f6rev asla \u00e7al\u0131\u015fmayacak.\");\n                }\n            }, 1000);\n        } catch (IllegalStateException e) {\n            System.out.println(\"Hata: \u0130ptal edilmi\u015f bir timer'a g\u00f6rev eklenemez.\");\n        }\n    }\n}<\/code><\/pre>\n
timer.cancel()<\/code> \u00e7a\u011fr\u0131s\u0131, Timer<\/code> taraf\u0131ndan zamanlanm\u0131\u015f t\u00fcm g\u00f6revlerin y\u00fcr\u00fct\u00fclmesini durdurur ve Timer<\/code>‘\u0131n arka plan i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 sonland\u0131r\u0131r. Bu, \u00f6zellikle uygulaman\u0131z kapan\u0131rken veya art\u0131k zamanlanm\u0131\u015f g\u00f6revlere ihtiyac\u0131n\u0131z kalmad\u0131\u011f\u0131nda kaynak s\u0131z\u0131nt\u0131lar\u0131n\u0131 \u00f6nlemek i\u00e7in \u00f6nemlidir. \u0130ptal edilmi\u015f bir Timer<\/code> nesnesine yeni g\u00f6revler zamanlamaya \u00e7al\u0131\u015fmak IllegalStateException<\/code> ile sonu\u00e7lan\u0131r.<\/p>\n
Daemon Timer Kullan\u0131m\u0131<\/h4>\n
Daemon Timer<\/code>‘\u0131n JVM kapan\u0131\u015f\u0131 \u00fczerindeki etkisini g\u00f6sterme.<\/p>\n
import java.util.Timer;\nimport java.util.TimerTask;\nimport java.util.Date;\n\npublic class DaemonTimerExample {\n    public static void main(String[] args) {\n        \/\/ Daemon Timer: Ana i\u015f par\u00e7ac\u0131\u011f\u0131 bitti\u011finde JVM kapan\u0131r, timer g\u00f6revleri yar\u0131m kalabilir.\n        Timer daemonTimer = new Timer(true); \/\/ true = daemon thread\n\n        TimerTask daemonTask = new TimerTask() {\n            private int counter = 0;\n            @Override\n            public void run() {\n                System.out.println(\"Daemon g\u00f6rev (\" + (++counter) + \") \u00e7al\u0131\u015ft\u0131: \" + new Date());\n                try {\n                    Thread.sleep(2000); \/\/ Uzun s\u00fcren bir g\u00f6rev sim\u00fclasyonu\n                } catch (InterruptedException e) {\n                    Thread.currentThread().interrupt();\n                }\n            }\n        };\n\n        daemonTimer.schedule(daemonTask, 0, 1000); \/\/ Hemen ba\u015fla, her saniye \u00e7al\u0131\u015f\n\n        System.out.println(\"Ana i\u015f par\u00e7ac\u0131\u011f\u0131 ba\u015flad\u0131. 3 saniye sonra bitecek.\");\n        try {\n            Thread.sleep(3000); \/\/ Ana i\u015f par\u00e7ac\u0131\u011f\u0131 3 saniye \u00e7al\u0131\u015fs\u0131n\n        } catch (InterruptedException e) {\n            Thread.currentThread().interrupt();\n        }\n        System.out.println(\"Ana i\u015f par\u00e7ac\u0131\u011f\u0131 sona erdi.\");\n        \/\/ Daemon timer oldu\u011fu i\u00e7in, ana i\u015f par\u00e7ac\u0131\u011f\u0131 bitti\u011finde JVM kapan\u0131r,\n        \/\/ daemonTask muhtemelen tamamlanmadan durur.\n\n        \/\/ E\u011fer non-daemon bir timer olsayd\u0131 (Timer timer = new Timer();),\n        \/\/ JVM, timer'\u0131 iptal edene veya t\u00fcm g\u00f6revler bitene kadar kapanmazd\u0131.\n    }\n}<\/code><\/pre>\n
Bu \u00f6rnekte, daemonTimer<\/code> bir daemon i\u015f par\u00e7ac\u0131\u011f\u0131 olarak olu\u015fturulur. Ana i\u015f par\u00e7ac\u0131\u011f\u0131 3 saniye sonra bitti\u011finde, JVM kapan\u0131r ve daemonTask<\/code>‘\u0131n \u00e7al\u0131\u015fmas\u0131 kesintiye u\u011frar. E\u011fer Timer(true)<\/code> yerine new Timer()<\/code> kullan\u0131lsayd\u0131, ana i\u015f par\u00e7ac\u0131\u011f\u0131 bitse bile JVM, daemonTimer<\/code>‘\u0131 a\u00e7\u0131k tutan non-daemon i\u015f par\u00e7ac\u0131\u011f\u0131 nedeniyle kapanmazd\u0131. Bu, sunucu uygulamalar\u0131nda veya arka plan servislerinde, uygulaman\u0131n d\u00fczg\u00fcn bir \u015fekilde kapanmas\u0131n\u0131 sa\u011flamak i\u00e7in \u00f6nemlidir.<\/p>\n
Timer<\/code> ve TimerTask<\/code> Kullan\u0131m\u0131nda Dikkat Edilmesi Gerekenler ve S\u0131n\u0131rlamalar<\/h3>\n
Timer<\/code> ve TimerTask<\/code> basit zamanlama ihtiya\u00e7lar\u0131 i\u00e7in yeterli olsa da, \u00f6zellikle daha karma\u015f\u0131k veya \u00fcretim ortamlar\u0131nda kullan\u0131lacak uygulamalar i\u00e7in baz\u0131 \u00f6nemli s\u0131n\u0131rlamalara ve dikkat edilmesi gereken noktalara sahiptir.<\/p>\n
Tek \u0130\u015f Par\u00e7ac\u0131\u011f\u0131 (Single Thread)<\/h4>\n
Bu, Timer<\/code> s\u0131n\u0131f\u0131n\u0131n en \u00f6nemli s\u0131n\u0131rlamas\u0131d\u0131r. Bir Timer<\/code> nesnesi, zamanlanm\u0131\u015f t\u00fcm g\u00f6revleri y\u00fcr\u00fctmek i\u00e7in tek bir arka plan i\u015f par\u00e7ac\u0131\u011f\u0131<\/em> kullan\u0131r.<\/p>\n
*   Etkisi:<\/strong> E\u011fer bir TimerTask<\/code> uzun s\u00fcrerse veya bir bloklama i\u015flemi (\u00f6rne\u011fin, a\u011f \u00e7a\u011fr\u0131s\u0131, veritaban\u0131 sorgusu) yaparsa, o Timer<\/code> \u00f6rne\u011fi taraf\u0131ndan zamanlanm\u0131\u015f di\u011fer t\u00fcm g\u00f6revler gecikecektir. Bu, uygulaman\u0131z\u0131n performans\u0131n\u0131 ve zamanlama do\u011frulu\u011funu ciddi \u015fekilde etkileyebilir.
\n*   \u00c7\u00f6z\u00fcm:<\/strong> Farkl\u0131 ba\u011f\u0131ms\u0131z g\u00f6revler i\u00e7in birden fazla Timer<\/code> nesnesi olu\u015fturulabilir, ancak bu da her Timer<\/code> i\u00e7in yeni bir i\u015f par\u00e7ac\u0131\u011f\u0131 anlam\u0131na gelir ve i\u015f par\u00e7ac\u0131\u011f\u0131 y\u00f6netimini karma\u015f\u0131kla\u015ft\u0131r\u0131r.<\/p>\n
\u0130stisna Y\u00f6netimi<\/h4>\n
TimerTask<\/code>‘\u0131n run()<\/code> metodunda f\u0131rlat\u0131lan yakalanmam\u0131\u015f bir istisna, Timer<\/code>‘\u0131n arka plan i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 sonland\u0131r\u0131r.<\/p>\n
*   Etkisi:<\/strong> Timer<\/code> i\u015f par\u00e7ac\u0131\u011f\u0131 sonland\u0131\u011f\u0131nda, o Timer<\/code> nesnesi taraf\u0131ndan zamanlanm\u0131\u015f hi\u00e7bir g\u00f6rev bir daha \u00e7al\u0131\u015ft\u0131r\u0131lmaz. Bu, uygulaman\u0131zda sessizce g\u00f6revlerin durmas\u0131na ve kritik i\u015flevlerin aksamas\u0131na neden olabilir.
\n*   \u00c7\u00f6z\u00fcm:<\/strong> Her zaman TimerTask<\/code>‘\u0131n run()<\/code> metodunun i\u00e7indeki kodu kapsaml\u0131 try-catch<\/code> bloklar\u0131 ile sarmalamak esast\u0131r. Bu, istisnalar\u0131n i\u015f par\u00e7ac\u0131\u011f\u0131n\u0131 sonland\u0131rmas\u0131n\u0131 engeller ve g\u00f6revin hatay\u0131 loglay\u0131p devam etmesini veya uygun bir \u015fekilde ba\u015far\u0131s\u0131z olmas\u0131n\u0131 sa\u011flar.<\/p>\n
public class RobustTask extends TimerTask {\n    @Override\n    public void run() {\n        try {\n            System.out.println(\"G\u00f6rev \u00e7al\u0131\u015f\u0131yor... \" + new Date());\n            \/\/ Hata f\u0131rlatabilecek bir i\u015flem\n            if (Math.random() > 0.5) {\n                throw new RuntimeException(\"Rastgele bir hata olu\u015ftu!\");\n            }\n            System.out.println(\"G\u00f6rev ba\u015far\u0131yla tamamland\u0131.\");\n        } catch (Exception e) {\n            System.err.println(\"G\u00f6rev s\u0131ras\u0131nda hata olu\u015ftu: \" + e.getMessage());\n            \/\/ Hatan\u0131n detaylar\u0131n\u0131 loglay\u0131n veya bildirim g\u00f6nderin\n        }\n    }\n}<\/code><\/pre>\n
Zamanlama Do\u011frulu\u011fu<\/h4>\n
Timer<\/code> ve TimerTask<\/code>, i\u015fletim sisteminin zamanlama yeteneklerine ve sistem y\u00fck\u00fcne ba\u011fl\u0131 olarak en iyi \u00e7aba (best-effort) zamanlama sunar.<\/p>\n
*   Etkisi:<\/strong> G\u00f6revlerin tam olarak planlanan milisaniyede ba\u015flamas\u0131 garanti edilmez. \u00d6zellikle yo\u011fun sistemlerde veya JVM’in \u00e7\u00f6p toplay\u0131c\u0131s\u0131 \u00e7al\u0131\u015ft\u0131\u011f\u0131nda gecikmeler ya\u015fanabilir.
\n*   Date<\/code> Kullan\u0131m\u0131:<\/strong> Date<\/code> nesneleri ile zamanlama yaparken, sistem saatinin de\u011fi\u015fmesi (\u00f6rne\u011fin, yaz saati uygulamas\u0131) planlanan g\u00f6revlerin zaman\u0131n\u0131 etkileyebilir.<\/p>\n
JVM Kapan\u0131\u015f\u0131<\/h4>\n
Varsay\u0131lan olarak, Timer<\/code> taraf\u0131ndan olu\u015fturulan i\u015f par\u00e7ac\u0131\u011f\u0131 bir non-daemon i\u015f par\u00e7ac\u0131\u011f\u0131d\u0131r.<\/p>\n
*   Etkisi:<\/strong> E\u011fer uygulaman\u0131zdaki t\u00fcm kullan\u0131c\u0131 i\u015f par\u00e7ac\u0131klar\u0131 (main thread dahil) sona erse bile, a\u00e7\u0131k bir Timer<\/code> i\u015f par\u00e7ac\u0131\u011f\u0131 varsa JVM kapanmayacakt\u0131r. Bu, uygulaman\u0131z\u0131n beklenenden daha uzun s\u00fcre \u00e7al\u0131\u015fmas\u0131na veya “as\u0131l\u0131 kalmas\u0131na” neden olabilir.
\n*   \u00c7\u00f6z\u00fcm:<\/strong> Uygulama kapan\u0131rken timer.cancel()<\/code> metodunu \u00e7a\u011f\u0131rmak veya Timer<\/code>‘\u0131 bir daemon i\u015f par\u00e7ac\u0131\u011f\u0131 olarak (new Timer(true)<\/code>) olu\u015fturmak gerekir. Daemon i\u015f par\u00e7ac\u0131klar\u0131 JVM’in kapanmas\u0131n\u0131 engellemez, ancak bu da g\u00f6revlerin yar\u0131m kalabilece\u011fi anlam\u0131na gelir.<\/p>\n
Alternatifler: ScheduledExecutorService<\/code><\/h3>\n
Java 5 ile birlikte tan\u0131t\u0131lan java.util.concurrent<\/code> paketi, e\u015fzamanl\u0131 programlama i\u00e7in \u00e7ok daha g\u00fc\u00e7l\u00fc ve esnek ara\u00e7lar sunar. Zamanlanm\u0131\u015f g\u00f6revler i\u00e7in ScheduledExecutorService<\/code>, Timer<\/code> ve TimerTask<\/code>‘a modern ve tercih edilen bir alternatiftir.<\/p>\n
ScheduledExecutorService<\/code>‘in temel avantajlar\u0131 \u015funlard\u0131r:<\/p>\n
*   \u0130\u015f Par\u00e7ac\u0131\u011f\u0131 Havuzu (Thread Pool):<\/strong> ScheduledExecutorService<\/code>, bir i\u015f par\u00e7ac\u0131\u011f\u0131 havuzu kullan\u0131r. Bu, ayn\u0131 anda birden fazla g\u00f6revin \u00e7al\u0131\u015ft\u0131r\u0131labilece\u011fi anlam\u0131na gelir. Bir g\u00f6revin uzun s\u00fcrmesi, di\u011fer g\u00f6revlerin zamanlamas\u0131n\u0131 etkilemez.
\n    *   Executors.newSingleThreadScheduledExecutor()<\/code>: Tek i\u015f par\u00e7ac\u0131kl\u0131 bir havuz olu\u015fturur, Timer<\/code>‘a benzer davran\u0131\u015f g\u00f6sterir ancak daha iyi istisna y\u00f6netimi sunar.
\n    *   Executors.newScheduledThreadPool(int corePoolSize)<\/code>: Belirtilen say\u0131da i\u015f par\u00e7ac\u0131\u011f\u0131na sahip bir havuz olu\u015fturur.<\/p>\n
*   Daha \u0130yi \u0130stisna Y\u00f6netimi:<\/strong> ScheduledExecutorService<\/code>‘deki bir g\u00f6revde yakalanmam\u0131\u015f bir istisna, sadece o g\u00f6revi etkiler ve havuzdaki di\u011fer g\u00f6revlerin \u00e7al\u0131\u015fmas\u0131n\u0131 durdurmaz.<\/p>\n
*   Future<\/code> Nesneleri:<\/strong> schedule<\/code> metotlar\u0131 bir ScheduledFuture<\/code> nesnesi d\u00f6nd\u00fcr\u00fcr. Bu, g\u00f6revin durumunu kontrol etmenize, iptal etmenize ve hatta g\u00f6revin d\u00f6n\u00fc\u015f de\u011ferini alman\u0131za olanak tan\u0131r.<\/p>\n
*   Esnek Zamanlama Metotlar\u0131:<\/strong> ScheduledExecutorService<\/code> de Timer<\/code>‘a benzer zamanlama metotlar\u0131na sahiptir, ancak daha g\u00fcvenilirdir:
\n    *   schedule(Runnable command, long delay, TimeUnit unit)<\/code>: Belirtilen gecikmeden sonra bir kez \u00e7al\u0131\u015ft\u0131r\u0131r.
\n    *   schedule(Callable callable, long delay, TimeUnit unit)<\/code>: Belirtilen gecikmeden sonra bir kez \u00e7al\u0131\u015ft\u0131r\u0131r ve bir sonu\u00e7 d\u00f6nd\u00fcr\u00fcr.
\n    *   scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit)<\/code>: Sabit oranl\u0131 tekrarlayan g\u00f6revler i\u00e7in.
\n    *   scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit)<\/code>: Sabit gecikmeli tekrarlayan g\u00f6revler i\u00e7in. (Buradaki delay<\/code> parametresi, Timer<\/code>‘daki period<\/code> parametresinin schedule<\/code> metoduyla ayn\u0131 mant\u0131kta \u00e7al\u0131\u015f\u0131r.)<\/p>\n
Basit ScheduledExecutorService<\/code> \u00d6rne\u011fi:<\/strong><\/p>\n
import java.util.concurrent.Executors;\nimport java.util.concurrent.ScheduledExecutorService;\nimport java.util.concurrent.TimeUnit;\nimport java.util.Date;\n\npublic class ScheduledExecutorServiceExample {\n    public static void main(String[] args) {\n        \/\/ 2 i\u015f par\u00e7ac\u0131kl\u0131 bir zamanlanm\u0131\u015f havuz olu\u015ftur\n        ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(2);\n\n        Runnable task1 = () -> {\n            long startTime = System.currentTimeMillis();\n            System.out.println(\"G\u00f6rev 1 ba\u015flad\u0131: \" + new Date());\n            try {\n                Thread.sleep(4000); \/\/ Uzun s\u00fcren bir g\u00f6rev\n            } catch (InterruptedException e) {\n                Thread.currentThread().interrupt();\n            }\n            long endTime = System.currentTimeMillis();\n            System.out.println(\"G\u00f6rev 1 bitti: \" + new Date() + \", S\u00fcre: \" + (endTime - startTime) + \"ms\");\n        };\n\n        Runnable task2 = () -> {\n            System.out.println(\"G\u00f6rev 2 \u00e7al\u0131\u015ft\u0131: \" + new Date());\n        };\n\n        \/\/ G\u00f6rev 1'i 1 saniye gecikmeyle ba\u015flat, her 5 saniyede bir sabit gecikmeyle tekrarla\n        scheduler.scheduleWithFixedDelay(task1, 1, 5, TimeUnit.SECONDS);\n\n        \/\/ G\u00f6rev 2'yi 2 saniye gecikmeyle ba\u015flat, her 2 saniyede bir sabit oranla tekrarla\n        scheduler.scheduleAtFixedRate(task2, 2, 2, TimeUnit.SECONDS);\n\n        System.out.println(\"Scheduler ba\u015flad\u0131. 20 saniye sonra kapanacak.\");\n\n        try {\n            Thread.sleep(20000); \/\/ Ana program\u0131n biraz \u00e7al\u0131\u015fmas\u0131na izin ver\n        } catch (InterruptedException e) {\n            Thread.currentThread().interrupt();\n        }\n\n        \/\/ Scheduler'\u0131 kapat\n        scheduler.shutdown();\n        try {\n            if (!scheduler.awaitTermination(5, TimeUnit.SECONDS)) {\n                scheduler.shutdownNow(); \/\/ E\u011fer g\u00f6revler 5 saniyede bitmezse zorla kapat\n            }\n        } catch (InterruptedException e) {\n            scheduler.shutdownNow();\n            Thread.currentThread().interrupt();\n        }\n        System.out.println(\"Scheduler kapat\u0131ld\u0131.\");\n    }\n}<\/code><\/pre>\n
Bu \u00f6rnekte, task1<\/code> uzun s\u00fcrse bile, task2<\/code> kendi zamanlamas\u0131na g\u00f6re \u00e7al\u0131\u015fmaya devam eder \u00e7\u00fcnk\u00fc ScheduledExecutorService<\/code> bir i\u015f par\u00e7ac\u0131\u011f\u0131 havuzu kullan\u0131r. shutdown()<\/code> ve awaitTermination()<\/code> metotlar\u0131, uygulaman\u0131n d\u00fczg\u00fcn bir \u015fekilde kapanmas\u0131n\u0131 ve zamanlanm\u0131\u015f g\u00f6revlerin tamamlanmas\u0131n\u0131 veya uygun bir \u015fekilde sonland\u0131r\u0131lmas\u0131n\u0131 sa\u011flar.<\/p>\n
Yeni Java uygulamalar\u0131nda veya karma\u015f\u0131k zamanlama ihtiya\u00e7lar\u0131nda, ScheduledExecutorService<\/code> genellikle Timer<\/code> ve TimerTask<\/code>‘a g\u00f6re daha g\u00fc\u00e7l\u00fc, esnek ve g\u00fcvenilir bir se\u00e7imdir.<\/p>\n
Sonu\u00e7<\/h3>\n
java.util.Timer<\/code> ve java.util.TimerTask<\/code> s\u0131n\u0131flar\u0131, Java’da zamanlanm\u0131\u015f g\u00f6revleri y\u00f6netmek i\u00e7in basit ve anla\u015f\u0131l\u0131r bir mekanizma sunar. Tek seferlik veya tekrarlayan g\u00f6revleri belirli gecikmelerle veya sabit oranlarla planlamak i\u00e7in kullan\u0131labilirler. \u00d6zellikle k\u00fc\u00e7\u00fck \u00f6l\u00e7ekli uygulamalar veya tek i\u015f par\u00e7ac\u0131kl\u0131, basit zamanlama ihtiya\u00e7lar\u0131 i\u00e7in hala ge\u00e7erli bir \u00e7\u00f6z\u00fcm olabilirler.<\/p>\n
Ancak, Timer<\/code>‘\u0131n tek i\u015f par\u00e7ac\u0131kl\u0131 yap\u0131s\u0131, istisna y\u00f6netimindeki hassasiyeti ve zamanlama do\u011frulu\u011fu \u00fczerindeki s\u0131n\u0131rlamalar\u0131, onu b\u00fcy\u00fck \u00f6l\u00e7ekli, y\u00fcksek performansl\u0131 veya kritik uygulamalar i\u00e7in yetersiz k\u0131lar. Bir g\u00f6revdeki uzun s\u00fcreli bloklama veya yakalanmam\u0131\u015f bir istisna, t\u00fcm zamanlanm\u0131\u015f g\u00f6revlerin durmas\u0131na neden olabilir, bu da \u00fcretim ortamlar\u0131nda ciddi sorunlara yol a\u00e7abilir.<\/p>\n
Java 5 ile tan\u0131t\u0131lan java.util.concurrent.ScheduledExecutorService<\/code>, Timer<\/code>‘\u0131n t\u00fcm s\u0131n\u0131rlamalar\u0131n\u0131 gideren modern, \u00e7ok i\u015f par\u00e7ac\u0131kl\u0131 ve daha sa\u011flam bir alternatiftir. \u0130\u015f par\u00e7ac\u0131\u011f\u0131 havuzlar\u0131, geli\u015fmi\u015f istisna y\u00f6netimi ve Future<\/code> nesneleri arac\u0131l\u0131\u011f\u0131yla g\u00f6rev y\u00f6netimi gibi \u00f6zellikler sunarak, zamanlanm\u0131\u015f g\u00f6revlerin daha g\u00fcvenilir ve verimli bir \u015fekilde y\u00fcr\u00fct\u00fclmesini sa\u011flar.<\/p>\n
\u00d6zetle, basit senaryolar i\u00e7in Timer<\/code> ve TimerTask<\/code> yeterli olabilirken, yeni geli\u015ftirilen uygulamalar ve karma\u015f\u0131k zamanlama gereksinimleri i\u00e7in ScheduledExecutorService<\/code> tercih edilmesi gereken \u00e7\u00f6z\u00fcmd\u00fcr. Do\u011fru arac\u0131 se\u00e7mek, uygulaman\u0131z\u0131n performans\u0131n\u0131, g\u00fcvenilirli\u011fini ve s\u00fcrd\u00fcr\u00fclebilirli\u011fini do\u011frudan etkileyecektir.<\/body><\/p>\n","protected":false},"excerpt":{"rendered":"Java Timer ve TimerTask ile Zamanlanm\u0131\u015f G\u00f6revler: Kapsaml\u0131 Bir Rehber\nZamanlanm\u0131\u015f g\u00f6revler, modern yaz\u0131l\u0131m uygulamalar\u0131n\u0131n ayr\u0131lmaz bir p","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1408],"tags":[],"class_list":{"0":"post-34808","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-java","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"\nJava Timer ve TimerTask ile Zamanlanm\u0131\u015f G\u00f6revler: Kapsaml\u0131 Bir Rehber - 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