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These are the user uploaded subtitles that are being translated: 1 1 00:00:01,170 --> 00:00:02,120 In this video, 2 2 00:00:02,120 --> 00:00:04,880 we're gonna discuss bean lifecycle methods. 3 3 00:00:07,790 --> 00:00:10,140 So when the Spring container first starts 4 4 00:00:10,140 --> 00:00:12,240 there are a couple of things that happens. 5 5 00:00:13,610 --> 00:00:16,720 First off, the beans are instantiated, 6 6 00:00:16,720 --> 00:00:19,410 and then the actual dependencies are injected, 7 7 00:00:21,650 --> 00:00:24,180 next you have some internal Spring processing 8 8 00:00:24,180 --> 00:00:26,080 that occurs with the bean factory, 9 9 00:00:26,980 --> 00:00:28,230 and then you have the option 10 10 00:00:28,230 --> 00:00:31,670 of adding your own custom initialization code, 11 11 00:00:33,460 --> 00:00:35,880 and then at that point the bean is ready for use. 12 12 00:00:35,880 --> 00:00:37,360 So you can call methods on it, 13 13 00:00:37,360 --> 00:00:38,460 do work with the bean, 14 14 00:00:38,460 --> 00:00:39,960 so on and so forth. 15 15 00:00:39,960 --> 00:00:42,330 At a certain point the containers actually shutdown 16 16 00:00:42,330 --> 00:00:44,230 meaning your application is shutdown 17 17 00:00:44,230 --> 00:00:46,340 like what context.close, 18 18 00:00:46,340 --> 00:00:47,880 then you also have a chance 19 19 00:00:47,880 --> 00:00:50,190 to call your custom destroy method, 20 20 00:00:50,190 --> 00:00:53,350 and that code'll execute before the actual application 21 21 00:00:53,350 --> 00:00:57,500 is stopped or before the actual beans lifecycle is over. 22 22 00:00:58,350 --> 00:00:59,500 The one thing you want to take a look 23 23 00:00:59,500 --> 00:01:01,190 at are those two orange sections 24 24 00:01:01,190 --> 00:01:04,410 here adding your own custom methods. 25 25 00:01:06,140 --> 00:01:08,890 What you can do is you can add your own custom code 26 26 00:01:08,890 --> 00:01:12,260 that happens during bean initialization. 27 27 00:01:12,260 --> 00:01:14,300 So you can call custom business logic, 28 28 00:01:14,300 --> 00:01:15,330 you can set up handles, 29 29 00:01:15,330 --> 00:01:18,590 so like databases, or sockets, or whatever. 30 30 00:01:18,590 --> 00:01:20,250 You can also do a similar thing 31 31 00:01:20,250 --> 00:01:23,190 when a bean is actually being destroyed or destructed. 32 32 00:01:23,190 --> 00:01:25,795 So again, you can call any custom business methods, 33 33 00:01:25,795 --> 00:01:28,860 or you can clean up any handles 34 34 00:01:28,860 --> 00:01:30,240 that you may have to resources 35 35 00:01:30,240 --> 00:01:32,370 like databases, sockets, or files. 36 36 00:01:32,370 --> 00:01:34,610 So basically what this provides here 37 37 00:01:34,610 --> 00:01:36,900 is that during the bean lifecycle, 38 38 00:01:36,900 --> 00:01:40,340 Spring allows you to call some of your custom code, 39 39 00:01:40,340 --> 00:01:41,920 and these are what we call hooks, 40 40 00:01:41,920 --> 00:01:43,390 where you can actually hook in codes 41 41 00:01:43,390 --> 00:01:47,810 to execute during bean initialization or bean destruction. 42 42 00:01:50,350 --> 00:01:52,160 All right, so now, how would you do this? 43 43 00:01:52,160 --> 00:01:55,650 Well, you simply make configuration entry in your XML file. 44 44 00:01:55,650 --> 00:01:57,880 So for bean initialization, 45 45 00:01:57,880 --> 00:02:01,260 you make use of this attribute called init-method, 46 46 00:02:01,260 --> 00:02:03,690 and then you give the actual method name 47 47 00:02:03,690 --> 00:02:06,150 that you would like for Spring to call on your bean. 48 48 00:02:06,150 --> 00:02:09,310 Now this method name can be any method name. 49 49 00:02:09,310 --> 00:02:11,040 Here I called doMyStartupStuff. 50 50 00:02:11,040 --> 00:02:13,190 It could be called fubar or whatever, 51 51 00:02:16,970 --> 00:02:20,200 and we can also do a similar thing for the destroy method. 52 52 00:02:20,200 --> 00:02:21,490 So again, you simply make 53 53 00:02:21,490 --> 00:02:24,160 a configuration entry here in your XML file. 54 54 00:02:24,160 --> 00:02:25,580 You simply give the method name 55 55 00:02:25,580 --> 00:02:27,510 you want Spring to call for destroy, 56 56 00:02:27,510 --> 00:02:29,140 and again, it can be any name. 57 57 00:02:31,520 --> 00:02:33,000 All right, so this all looks kinda good. 58 58 00:02:33,000 --> 00:02:34,640 What's the basic development process? 59 59 00:02:34,640 --> 00:02:36,830 So again, I love my step-by-step. 60 60 00:02:36,830 --> 00:02:38,340 So the first thing you do is you simply 61 61 00:02:38,340 --> 00:02:40,720 define your methods for the init and destroy 62 62 00:02:40,720 --> 00:02:43,380 in your bean class, then the next step 63 63 00:02:43,380 --> 00:02:45,229 is you simply configure those method names 64 64 00:02:45,229 --> 00:02:47,630 in the Spring configuration file, 65 65 00:02:47,630 --> 00:02:50,740 and in the next video, we'll dive into Eclipse, 66 66 00:02:50,740 --> 00:02:52,784 and we'll actually walk through this development process, 67 67 00:02:52,784 --> 00:02:54,910 and we'll test out this feature. 68 68 00:02:54,910 --> 00:02:56,780 So I'll see you in the next video. 5834