Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 1 00:00:00,941 --> 00:00:02,599 Alright, so let's go ahead 2 2 00:00:02,599 --> 00:00:04,431 and dive in to Eclipse and we're gonna run 3 3 00:00:04,431 --> 00:00:06,858 some demos here on Bean Scopes. 4 4 00:00:06,858 --> 00:00:08,850 We'll take a look at those singleton scope 5 5 00:00:08,850 --> 00:00:10,726 and a prototype scope and we'll see 6 6 00:00:10,726 --> 00:00:12,471 all of this code running in action 7 7 00:00:12,471 --> 00:00:15,888 and I don't know, just get a good feel for it. 8 8 00:00:15,888 --> 00:00:17,924 The first thing we wanna do is, 9 9 00:00:17,924 --> 00:00:20,753 copy our application context file. 10 10 00:00:20,753 --> 00:00:23,108 We're actually going to create a new version of it, 11 11 00:00:23,108 --> 00:00:26,371 line:15% so we'll take this existing application context, 12 12 00:00:26,371 --> 00:00:29,954 line:15% we'll just do a right click and choose copy 13 13 00:00:33,169 --> 00:00:35,451 and then, we'll simply paste it, 14 14 00:00:35,451 --> 00:00:39,368 so we just do a right click and we choose paste 15 15 00:00:40,997 --> 00:00:43,667 and this new version, we'll give it a new name here. 16 16 00:00:43,667 --> 00:00:47,500 I'll call it, beanScope-applicationContext.xml 17 17 00:00:50,457 --> 00:00:52,643 and so, with these spring config files, 18 18 00:00:52,643 --> 00:00:54,703 you can really give them any name that you want. 19 19 00:00:54,703 --> 00:00:57,313 Your project can actually have multiple config files 20 20 00:00:57,313 --> 00:00:58,986 and here you simply reference the one that you want, 21 21 00:00:58,986 --> 00:01:02,071 so you can call it anything, fubar.xml if you wanted to, 22 22 00:01:02,071 --> 00:01:04,382 as long as you reference it with that name. 23 23 00:01:04,382 --> 00:01:07,912 Anyway, I have my beanScope-applicationContext.xml, 24 24 00:01:07,912 --> 00:01:09,176 now let's go ahead and bean it up, 25 25 00:01:09,176 --> 00:01:11,926 let's go ahead and open this file 26 26 00:01:14,583 --> 00:01:16,318 and what I wanna do is, I just clean it up. 27 27 00:01:16,318 --> 00:01:20,401 There's some lines in here that I want to delete. 28 28 00:01:22,018 --> 00:01:24,711 I'll select lines 10 and 11, I'll highlight those 29 29 00:01:24,711 --> 00:01:26,677 and I'll delete these lines because we're 30 30 00:01:26,677 --> 00:01:30,844 not going to use any of the property placeholder stuff here. 31 31 00:01:31,697 --> 00:01:33,987 I'm moving down a little bit further 32 32 00:01:33,987 --> 00:01:36,509 and I'll also remove that bean for myCricketCoach, 33 33 00:01:36,509 --> 00:01:39,896 so I'll just highlight the lines 24 through 34 34 34 00:01:39,896 --> 00:01:42,923 and I'll actually delete those lines 35 35 00:01:42,923 --> 00:01:45,963 and I'll just clean up some of this white space, 36 36 00:01:45,963 --> 00:01:48,195 move up and let's do a little quick check point, 37 37 00:01:48,195 --> 00:01:50,031 so in this config file that we just created, 38 38 00:01:50,031 --> 00:01:52,969 beanScope-applicationContext.xml, 39 39 00:01:52,969 --> 00:01:55,162 these are the only two entries that we should have 40 40 00:01:55,162 --> 00:01:58,186 inside of here for beans, so we'll have our FortuneService 41 41 00:01:58,186 --> 00:02:02,022 and we'll have our Coach, that points to our TrackCoach 42 42 00:02:02,022 --> 00:02:05,409 and that's all we should have, at this point. 43 43 00:02:05,409 --> 00:02:07,777 Now, by default, since we didn't specify 44 44 00:02:07,777 --> 00:02:10,149 a scope for our track coach, well, what's the scope? 45 45 00:02:10,149 --> 00:02:11,520 Well, it's singleton right? 46 46 00:02:11,520 --> 00:02:13,508 Basic information we've learned so far, 47 47 00:02:13,508 --> 00:02:16,165 so it'll simply be a single bean, 48 48 00:02:16,165 --> 00:02:20,232 now, everyone will reference when we run our application. 49 49 00:02:20,232 --> 00:02:22,356 Let's go ahead and create another main app, 50 50 00:02:22,356 --> 00:02:26,292 I'll call this guy, BeanScopeDemoApp.java, 51 51 00:02:26,292 --> 00:02:30,459 so I'll just do a right click, I'll say, new class 52 52 00:02:31,856 --> 00:02:36,023 and the actual name of the class again, BeanScopeDemoApp 53 53 00:02:37,981 --> 00:02:42,136 and I'll also go down and I'll check the box there 54 54 00:02:42,136 --> 00:02:44,534 for the public static void main, 55 55 00:02:44,534 --> 00:02:45,970 because I'll have a main method, 56 56 00:02:45,970 --> 00:02:48,398 just a little separate demo app that I'll use for 57 57 00:02:48,398 --> 00:02:51,286 testing out this scoping stuff. 58 58 00:02:51,286 --> 00:02:54,373 Alright, okay with all that stuff, hit, finish. 59 59 00:02:54,373 --> 00:02:58,621 Alright, so we have a very simple bean scope demo app. 60 60 00:02:58,621 --> 00:03:00,764 I'll just move in here and I'll just remove the 61 61 00:03:00,764 --> 00:03:03,718 auto-generated stuff and I'll write some quick comments 62 62 00:03:03,718 --> 00:03:05,916 here, as well as what I need to do. 63 63 00:03:05,916 --> 00:03:08,668 This is kinda, you're getting really used to this now, 64 64 00:03:08,668 --> 00:03:09,683 the first thing we need to do is, 65 65 00:03:09,683 --> 00:03:12,457 load the spring configuration file 66 66 00:03:12,457 --> 00:03:16,346 and then, simply retrieve beans from the spring container. 67 67 00:03:16,346 --> 00:03:17,681 Alright, that's kinda the game plan, 68 68 00:03:17,681 --> 00:03:19,477 let's write the code right here 69 69 00:03:19,477 --> 00:03:22,269 and you should probably know most of this now, 70 70 00:03:22,269 --> 00:03:24,107 from memory because you've seen this a lot 71 71 00:03:24,107 --> 00:03:27,069 so this is good practice, this is how you can really learn 72 72 00:03:27,069 --> 00:03:28,777 the technology, just by repeating it 73 73 00:03:28,777 --> 00:03:30,765 over and over again, just like a sport, 74 74 00:03:30,765 --> 00:03:33,182 practice, practice, practice. 75 75 00:03:39,509 --> 00:03:43,054 Let me go ahead and use that ClassPathXmlApplicationContext, 76 76 00:03:43,054 --> 00:03:45,574 I'll just do a copy paste, I say, new 77 77 00:03:45,574 --> 00:03:47,682 and I give the actual name, so this is gonna be 78 78 00:03:47,682 --> 00:03:51,000 the actual name of my new configuration file 79 79 00:03:51,000 --> 00:03:52,711 that we just created, so that's 80 80 00:03:52,711 --> 00:03:54,530 the file that we created called, 81 81 00:03:54,530 --> 00:03:57,280 beanScope-applicationContext.xml, 82 82 00:03:58,771 --> 00:04:01,611 let me go ahead and fix up the imports right here. 83 83 00:04:01,611 --> 00:04:04,671 I'll just hover over and say, import that given class, 84 84 00:04:04,671 --> 00:04:07,671 looks good and there we go, so yeah, 85 85 00:04:09,353 --> 00:04:12,074 that's our new config file that we're reading in here, 86 86 00:04:12,074 --> 00:04:14,741 beanScope-applicationContext.xml 87 87 00:04:15,612 --> 00:04:18,186 so again, you can have as many config files 88 88 00:04:18,186 --> 00:04:19,738 up here as you like for your project, 89 89 00:04:19,738 --> 00:04:21,558 simply load the appropriate one. 90 90 00:04:21,558 --> 00:04:22,969 Also, if you have multiple, you simply give 91 91 00:04:22,969 --> 00:04:24,681 a common denominated list, you can load in 92 92 00:04:24,681 --> 00:04:26,642 multiple configs if you wanted to. 93 93 00:04:26,642 --> 00:04:29,112 Alright, let's keep it simple for now. 94 94 00:04:29,112 --> 00:04:31,751 Now, let's go ahead and get some white space 95 95 00:04:31,751 --> 00:04:35,918 and let's go ahead and retrieve the bean from the container. 96 96 00:04:37,440 --> 00:04:39,316 I'm actually gonna retrieve two beans, 97 97 00:04:39,316 --> 00:04:40,843 so I'll start off with the first one here. 98 98 00:04:40,843 --> 00:04:44,843 I'll say, Coach theCoach = context.getBean, 99 99 00:04:46,631 --> 00:04:50,005 I give the name, which is, myCoach 100 100 00:04:50,005 --> 00:04:53,588 and then I give the interface, Coach.class. 101 101 00:04:54,905 --> 00:04:58,001 Looks good, and also you can just copy paste this line, 102 102 00:04:58,001 --> 00:05:00,751 for the second reference, so I'll 103 103 00:05:01,952 --> 00:05:04,688 just do a paste on that one, instead of the coach, 104 104 00:05:04,688 --> 00:05:07,694 I'll call it alphaCoach and everything 105 105 00:05:07,694 --> 00:05:10,834 else here stays the same, so basically, 106 106 00:05:10,834 --> 00:05:13,094 this is the code here for retrieving 107 107 00:05:13,094 --> 00:05:15,378 the bean from the spring container. 108 108 00:05:15,378 --> 00:05:18,325 Right now, it's a singleton, so 109 109 00:05:18,325 --> 00:05:20,323 we should get the same reference 110 110 00:05:20,323 --> 00:05:22,141 and we'll actually write some code in a second 111 111 00:05:22,141 --> 00:05:25,489 to show us the reference, but I'll kinda pause for now. 112 112 00:05:25,489 --> 00:05:27,790 In the next video, we'll write more code 113 113 00:05:27,790 --> 00:05:30,527 to print out the results of this reference. 114 114 00:05:30,527 --> 00:05:33,110 I'll see you in the next video. 10259