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These are the user uploaded subtitles that are being translated: 1 1 00:00:01,286 --> 00:00:02,119 All right, so we're making 2 2 00:00:02,119 --> 00:00:03,647 some good progress now. 3 3 00:00:03,647 --> 00:00:05,928 So we just completed step one of defining 4 4 00:00:05,928 --> 00:00:08,960 the dependency interface and the class. 5 5 00:00:08,960 --> 00:00:11,760 Now let's go ahead and focus in on step two, 6 6 00:00:11,760 --> 00:00:15,927 creating a constructor in our class for the injections. 7 7 00:00:20,336 --> 00:00:22,079 All right, so back into Eclipse. 8 8 00:00:22,079 --> 00:00:24,410 I need to actually create a constructor in my class 9 9 00:00:24,410 --> 00:00:25,470 for injections. 10 10 00:00:25,470 --> 00:00:28,174 So in my BaseballCoach class, 11 11 00:00:28,174 --> 00:00:30,073 I need to do two things actually. 12 12 00:00:30,073 --> 00:00:32,139 One is define a private field, 13 13 00:00:32,139 --> 00:00:33,765 and then, two, define a constructor. 14 14 00:00:33,765 --> 00:00:34,976 So let's go ahead and just write 15 15 00:00:34,976 --> 00:00:37,258 some quick comments here in the file. 16 16 00:00:37,258 --> 00:00:39,309 So here I'm gonna set up a 17 17 00:00:39,309 --> 00:00:41,709 private field for FortuneService. 18 18 00:00:41,709 --> 00:00:43,831 I'm also gonna give the variable name fortuneService 19 19 00:00:43,831 --> 00:00:46,119 with a lowercase f. 20 20 00:00:46,119 --> 00:00:48,710 Okay, so the capital F is the actual interface name. 21 21 00:00:48,710 --> 00:00:52,314 The lowercase f version is our variable or field. 22 22 00:00:52,314 --> 00:00:54,791 And then I define a constructor 23 23 00:00:54,791 --> 00:00:57,208 for the dependency injection. 24 24 00:00:58,495 --> 00:01:00,537 All these fancy buzz words here. 25 25 00:01:00,537 --> 00:01:04,198 We're actually doing it, which is pretty cool. 26 26 00:01:04,198 --> 00:01:05,952 So, creating a constructor, right? 27 27 00:01:05,952 --> 00:01:08,702 Nothing fancy, the same name as the class, 28 28 00:01:08,702 --> 00:01:09,831 BaseballCoach. 29 29 00:01:09,831 --> 00:01:11,157 And now for the argument, 30 30 00:01:11,157 --> 00:01:13,897 you simple set up the actual interface name here. 31 31 00:01:13,897 --> 00:01:17,180 So FortuneService, I'll call it theFortuneService, 32 32 00:01:17,180 --> 00:01:18,602 and then I simply make an assignment here 33 33 00:01:18,602 --> 00:01:20,170 inside of this constructor. 34 34 00:01:20,170 --> 00:01:24,337 So I say FortuneService, our field equals theFortuneService, 35 35 00:01:25,391 --> 00:01:29,284 the actual parameter being passed in. 36 36 00:01:29,284 --> 00:01:32,175 So Spring will actually construct our object, 37 37 00:01:32,175 --> 00:01:34,070 they'll pass in a dependency, 38 38 00:01:34,070 --> 00:01:35,719 and then we accept it, 39 39 00:01:35,719 --> 00:01:37,223 and then we simply assign it. 40 40 00:01:37,223 --> 00:01:39,112 And that's basically dependency injection. 41 41 00:01:39,112 --> 00:01:43,834 So our class is ready to accept dependency injection 42 42 00:01:43,834 --> 00:01:45,834 from the spring framework. 43 43 00:01:45,834 --> 00:01:48,584 So we're in good shape right now. 44 44 00:01:51,143 --> 00:01:52,382 All right, so we're making progress here 45 45 00:01:52,382 --> 00:01:54,143 with this dependency injection. 46 46 00:01:54,143 --> 00:01:57,858 Now let's go ahead and use this new FortuneService. 47 47 00:01:57,858 --> 00:02:01,199 So down in that getDailyFortune method, 48 48 00:02:01,199 --> 00:02:05,339 let me remove all of that auto generated stuff, 49 49 00:02:05,339 --> 00:02:07,688 and I'll write a quick comment here to myself. 50 50 00:02:07,688 --> 00:02:08,967 Actually, give me some white space. 51 51 00:02:08,967 --> 00:02:10,800 I need to stretch out. 52 52 00:02:12,829 --> 00:02:14,475 Okay, now here's my comment. 53 53 00:02:14,475 --> 00:02:18,428 I'm gonna use my fortuneService to give the fortune, right? 54 54 00:02:18,428 --> 00:02:21,008 So the coach can do daily workouts on his own. 55 55 00:02:21,008 --> 00:02:24,122 But for fortunes, he actually needs a helper. 56 56 00:02:24,122 --> 00:02:26,577 We're gonna use that dependency that was passed in. 57 57 00:02:26,577 --> 00:02:29,602 So you all say fortuneService.getFortune 58 58 00:02:29,602 --> 00:02:30,736 and that's what I return. 59 59 00:02:30,736 --> 00:02:32,573 So I'm basically helping out the coach 60 60 00:02:32,573 --> 00:02:34,442 by making use of this little helper class 61 61 00:02:34,442 --> 00:02:36,901 or like an assistant to help the coach out. 62 62 00:02:36,901 --> 00:02:38,556 We always wanna help the coach, right? 63 63 00:02:38,556 --> 00:02:39,958 Helping well. 64 64 00:02:39,958 --> 00:02:40,814 So that's basically it. 65 65 00:02:40,814 --> 00:02:43,176 So we're making use of our dependency 66 66 00:02:43,176 --> 00:02:45,343 in our actual application. 67 67 00:02:46,328 --> 00:02:47,161 So this is cool. 68 68 00:02:47,161 --> 00:02:49,693 We're doing some good dependency injection stuff here. 69 69 00:02:49,693 --> 00:02:50,526 Getting excited. 70 70 00:02:50,526 --> 00:02:53,036 We can probably go brag to our friends now that 71 71 00:02:53,036 --> 00:02:55,183 we're doing some dependency injection. 72 72 00:02:55,183 --> 00:02:56,850 We're doing some DI. 73 73 00:02:58,348 --> 00:03:01,926 We can now one up our friends at the water cooler 74 74 00:03:01,926 --> 00:03:03,835 when we talk again. 75 75 00:03:03,835 --> 00:03:08,002 Yeah, man, I'm doing some screen dependency injection. 76 76 00:03:09,064 --> 00:03:12,397 All right, so there we go, looking good. 77 77 00:03:13,981 --> 00:03:16,134 So now the next step here is configuring 78 78 00:03:16,134 --> 00:03:19,385 the dependency injection in our spring configuration file. 79 79 00:03:19,385 --> 00:03:21,730 So we need to set this up in our spring config file 80 80 00:03:21,730 --> 00:03:24,147 that application context.xml. 81 81 00:03:28,060 --> 00:03:30,074 So I'm going to just get some white space here. 82 82 00:03:30,074 --> 00:03:34,241 So I need to first define a bean here for that dependency. 83 83 00:03:37,326 --> 00:03:39,392 And that dependency of course is our fortune teller, 84 84 00:03:39,392 --> 00:03:42,493 our little helper, our assistant coach or whatever. 85 85 00:03:42,493 --> 00:03:44,956 So here I'll set up this bean. 86 86 00:03:44,956 --> 00:03:47,539 I give the id equals myFortune, 87 87 00:03:48,879 --> 00:03:50,875 and then class. 88 88 00:03:50,875 --> 00:03:52,220 I'll just set some double quotes here. 89 89 00:03:52,220 --> 00:03:54,530 I'll make it empty for right now. 90 90 00:03:54,530 --> 00:03:55,937 And what I need to do for classes, 91 91 00:03:55,937 --> 00:03:58,244 I need to get the fully qualified class name. 92 92 00:03:58,244 --> 00:04:01,020 So I'm gonna show you this really cool Eclipse trick 93 93 00:04:01,020 --> 00:04:02,520 on how to do this. 94 94 00:04:04,313 --> 00:04:06,693 So you can go back over to your HappyFortuneService, 95 95 00:04:06,693 --> 00:04:08,189 that's the one that we want. 96 96 00:04:08,189 --> 00:04:11,011 And you can simply click on the class name, 97 97 00:04:11,011 --> 00:04:12,595 HappyFortuneService, 98 98 00:04:12,595 --> 00:04:15,968 then you can right click and you can choose 99 99 00:04:15,968 --> 00:04:17,635 Copy Qualified Name. 100 100 00:04:18,667 --> 00:04:19,750 So what this will do is it'll give you 101 101 00:04:19,750 --> 00:04:21,529 the fully qualified name, 102 102 00:04:21,529 --> 00:04:25,196 meaning the package name dot the class name. 103 103 00:04:26,539 --> 00:04:30,258 So I can move back over to my application context.xml. 104 104 00:04:30,258 --> 00:04:34,425 I can right click on class=, and I can hit paste. 105 105 00:04:36,217 --> 00:04:37,760 And then booyah! 106 106 00:04:37,760 --> 00:04:38,641 All right, good. 107 107 00:04:38,641 --> 00:04:40,673 So we have the fully qualified class name, 108 108 00:04:40,673 --> 00:04:42,946 the package and the actual classes up. 109 109 00:04:42,946 --> 00:04:45,720 This is very useful if you have a very long, 110 110 00:04:45,720 --> 00:04:48,719 a very verbose package structure. 111 111 00:04:48,719 --> 00:04:50,502 This is an easy way to get it in there 112 112 00:04:50,502 --> 00:04:52,315 without having any typos or whatever, 113 113 00:04:52,315 --> 00:04:56,038 because we always make mistakes when we hand type stuff. 114 114 00:04:56,038 --> 00:04:57,567 All right, so that's a dependency. 115 115 00:04:57,567 --> 00:04:59,400 Now let's go ahead and 116 116 00:05:00,329 --> 00:05:03,079 set up the constructor injection. 117 117 00:05:05,180 --> 00:05:06,272 Ooh fancy term. 118 118 00:05:06,272 --> 00:05:08,116 I tell you, you'll really be able 119 119 00:05:08,116 --> 00:05:10,088 to brag to your friends here. 120 120 00:05:10,088 --> 00:05:12,508 So constructor injection. 121 121 00:05:12,508 --> 00:05:14,338 Now, to use constructor injection, 122 122 00:05:14,338 --> 00:05:17,005 you make use of constructor-arg, 123 123 00:05:18,294 --> 00:05:19,588 and it gave me an end element. 124 124 00:05:19,588 --> 00:05:23,669 Tell you what, I'm gonna just say space />. 125 125 00:05:23,669 --> 00:05:25,614 Yeah, because I don't that extra thing there. 126 126 00:05:25,614 --> 00:05:27,659 All right, and then I say ref=. 127 127 00:05:27,659 --> 00:05:30,674 And now for ref=, I give the actual ID 128 128 00:05:30,674 --> 00:05:34,211 of the bean that I'm gonna inject, the ID. 129 129 00:05:34,211 --> 00:05:36,425 So that myFortune up there, 130 130 00:05:36,425 --> 00:05:37,805 copy that bean name, 131 131 00:05:37,805 --> 00:05:38,698 and then I'm gonna move it down here 132 132 00:05:38,698 --> 00:05:40,106 and choose Paste. 133 133 00:05:40,106 --> 00:05:41,546 You can hand pick it if you want, 134 134 00:05:41,546 --> 00:05:42,914 but I like to kind of copy paste, 135 135 00:05:42,914 --> 00:05:45,497 'cos I save some typing errors. 136 136 00:05:46,421 --> 00:05:47,254 So that's it. 137 137 00:05:47,254 --> 00:05:48,841 So they're going to... 138 138 00:05:48,841 --> 00:05:50,527 What they're gonna do here is they're going to... 139 139 00:05:50,527 --> 00:05:51,963 When I say they, meaning spring, 140 140 00:05:51,963 --> 00:05:53,571 the spring framework or factory, 141 141 00:05:53,571 --> 00:05:56,096 they're gonna create our coach object, 142 142 00:05:56,096 --> 00:05:57,662 call the constructor, 143 143 00:05:57,662 --> 00:06:00,908 and they're gonna pass in that fortune reference, 144 144 00:06:00,908 --> 00:06:04,540 myFortune, which is effectively HappyFortuneService. 145 145 00:06:04,540 --> 00:06:07,035 So again, this car factory, 146 146 00:06:07,035 --> 00:06:09,081 they're actually gonna build a car for you. 147 147 00:06:09,081 --> 00:06:09,914 So spring, 148 148 00:06:09,914 --> 00:06:11,904 they're actually gonna construct the object for you, 149 149 00:06:11,904 --> 00:06:15,237 and inject the appropriate dependencies. 12451