1 00:00:01,140 --> 00:00:03,870 Now it's time to have some real fun. 2 00:00:04,060 --> 00:00:12,270 We've been similar user bookmarking process that is use at bookmarking a particular item will be writing 3 00:00:12,270 --> 00:00:17,580 code that touches most of the classes we wrote so far and this simulation. 4 00:00:17,760 --> 00:00:24,210 Each user will be associated with five random bookmarks only user may get associated with duplicate 5 00:00:24,220 --> 00:00:25,120 bookmarks. 6 00:00:25,560 --> 00:00:28,650 But let's not worry about duplications for now. 7 00:00:28,830 --> 00:00:33,100 We will first write a new class code view within com not semantics. 8 00:00:33,120 --> 00:00:37,150 We're not really a package in a real world application. 9 00:00:37,260 --> 00:00:42,240 Dishcloths would correspond to the user interface and that's the reason why we would call this class 10 00:00:42,270 --> 00:00:43,410 as a view. 11 00:00:44,070 --> 00:00:51,300 So the class what similar UI actions taken by a single user that is each method in this class would 12 00:00:51,300 --> 00:00:57,050 correspond to one or more actions that a single user takes within the web browser. 13 00:00:57,720 --> 00:01:05,010 Examples would be a particular user bookmarking few items or an editor marking one or more bookmarks 14 00:01:05,220 --> 00:01:11,430 as kid friendly under Methot in this class would be invoked from the launch class. 15 00:01:11,430 --> 00:01:14,400 So let's get started now and create the Buca us 16 00:01:14,400 --> 00:01:27,990 . 17 00:01:27,990 --> 00:01:30,990 So that's the class in your package. 18 00:01:31,590 --> 00:01:39,460 And first let's create since this is about bookmarking let's create the method called bookmark or block 19 00:01:39,480 --> 00:01:39,550 . 20 00:01:39,700 --> 00:01:43,900 Let's keep all the methods static. 21 00:01:46,380 --> 00:01:51,530 And since this is about a user bookmarking some bookmarks. 22 00:01:51,600 --> 00:01:53,760 So one of the parameters would be user. 23 00:01:54,210 --> 00:02:00,720 And let's just a humor that the user is presented with all the bookmarks in the system and the user 24 00:02:01,050 --> 00:02:06,840 then looks at all those bookmarks and selects five of them. 25 00:02:06,850 --> 00:02:07,490 OK. 26 00:02:07,950 --> 00:02:12,890 But we will be doing it randomly right now. 27 00:02:12,930 --> 00:02:15,240 So that's the bookmark signature. 28 00:02:15,270 --> 00:02:17,010 So let's just import here 29 00:02:20,850 --> 00:02:25,440 now this motard will be invoked from the launch class. 30 00:02:25,560 --> 00:02:33,520 So here let's call this as dark bookmarking So we are just launching the process. 31 00:02:33,600 --> 00:02:39,270 So that's the simulation part of simulation and let's create this matter 32 00:02:43,480 --> 00:02:45,120 Sculpey this over 33 00:02:48,630 --> 00:02:49,770 here. 34 00:02:50,520 --> 00:02:52,560 And so that's the second step. 35 00:02:52,620 --> 00:02:52,870 Right. 36 00:02:52,890 --> 00:02:54,880 The first step is loaded data. 37 00:02:55,260 --> 00:02:56,790 So let's just go with this 38 00:03:04,610 --> 00:03:06,700 and that's him bookmarking. 39 00:03:07,080 --> 00:03:15,330 And from here we will invoke the bookmark method and we will have to do that for all of the users so 40 00:03:15,330 --> 00:03:19,310 the users are maintained and this data structure users we know that. 41 00:03:19,560 --> 00:03:30,090 So let's just iterate over all the users and invoke the method and the view class so to users. 42 00:03:30,120 --> 00:03:42,670 And from here we're going to call view door mark and we're going to pass this user and the bookmarks 43 00:03:42,720 --> 00:03:43,470 . 44 00:03:43,470 --> 00:03:47,580 So that's about start bookmarking matter. 45 00:03:47,610 --> 00:03:50,280 So let's go back here and further this method. 46 00:03:50,850 --> 00:03:56,880 So first let's print who the user is who's who who is the user. 47 00:03:56,880 --> 00:04:05,720 So in a controlled space the new line here can make use of the e-mail motard here 48 00:04:10,080 --> 00:04:15,320 and we can say these bookmarking So this will show up in the output. 49 00:04:16,050 --> 00:04:26,830 Now each user bookmarks five of them five bookmarks and so we can see why less than five. 50 00:04:27,180 --> 00:04:34,410 But indeed a store class we have this method called user bookmarklet which means that a user can bookmark 51 00:04:34,800 --> 00:04:36,640 at most five of them. 52 00:04:36,720 --> 00:04:42,060 So we have this thing here but we need to make it public because it's private and so it's inaccessible 53 00:04:42,150 --> 00:04:45,500 outside that will actually make all of these public 54 00:04:50,910 --> 00:04:52,710 disclose this. 55 00:04:52,860 --> 00:04:54,150 So let's see 56 00:05:03,620 --> 00:05:10,620 so the user is browsing through all the book marks no user selects. 57 00:05:10,640 --> 00:05:12,310 Max FEIBEL Max. 58 00:05:12,700 --> 00:05:21,290 OK so first thing is we need to randomly select five off them and five off 15 bookmarks because there 59 00:05:21,290 --> 00:05:23,670 are three more pipes on each of them have five. 60 00:05:23,870 --> 00:05:27,450 So we need to randomly select one of the bookmarks from here. 61 00:05:27,830 --> 00:05:33,920 So let's we need to randomly select the index. 62 00:05:33,920 --> 00:05:37,250 So we need to indexes your first to get the type. 63 00:05:37,760 --> 00:05:44,100 And second to get the particular bookmark within a particular type. 64 00:05:44,120 --> 00:05:46,630 So first one we call it just type offset. 65 00:05:46,700 --> 00:05:47,440 So we are. 66 00:05:47,480 --> 00:05:49,460 So it's Carlist type offset. 67 00:05:49,730 --> 00:05:54,710 So that way we are going to get one of the bookmark apps and the second one within that particular type 68 00:05:54,720 --> 00:05:54,930 . 69 00:05:55,250 --> 00:06:00,760 We want to select a particular bookmark so we see its bookmark offset. 70 00:06:00,770 --> 00:06:04,990 Now you randomly select We can use the math function here. 71 00:06:05,030 --> 00:06:10,760 So in some mad dog around them which would read return a value between 0 and 1. 72 00:06:10,760 --> 00:06:14,700 So anywhere from zero to point nine now. 73 00:06:15,140 --> 00:06:16,630 So there are three of them. 74 00:06:16,640 --> 00:06:20,170 So or of three we need to get one random value. 75 00:06:20,330 --> 00:06:22,600 So it's a data store dot. 76 00:06:23,140 --> 00:06:25,100 We have more types. 77 00:06:25,160 --> 00:06:27,240 So which is three. 78 00:06:27,740 --> 00:06:30,350 OK so let's just go ahead. 79 00:06:31,100 --> 00:06:37,500 We need to call done I guess here and let's do the same thing here. 80 00:06:37,560 --> 00:06:45,250 And this value will be five you because each type has five round the variables five random bookmarks 81 00:06:45,550 --> 00:06:46,970 bookmarks. 82 00:06:48,410 --> 00:06:50,960 And it could be bookmarks count bar type. 83 00:06:50,960 --> 00:06:52,970 So this is disvalue is fine. 84 00:06:53,330 --> 00:07:01,450 So now we how the nexus we just need to select the bookmark now. 85 00:07:02,000 --> 00:07:16,290 So really when said more marks and the first one is type of said and this is a nice book mark offset 86 00:07:16,300 --> 00:07:16,480 . 87 00:07:16,550 --> 00:07:24,130 So sick so we how randomly selected one and next thing we need to do is so the. 88 00:07:24,190 --> 00:07:31,040 So in real world a user has randomly selected a bookmark and he's going to say Rick and once he's said 89 00:07:31,700 --> 00:07:37,670 that information will be passed to the backend server and it will reset the controller and from the 90 00:07:37,680 --> 00:07:41,460 controller to agree we passed to the book to the service on and so on. 91 00:07:41,690 --> 00:07:46,230 So we need to send this to the controller and we still haven't written any controllers. 92 00:07:46,340 --> 00:07:49,070 So that's right a controller that's introduced a controller now. 93 00:07:49,340 --> 00:07:51,550 So let's create a package for controllers 94 00:07:53,990 --> 00:07:55,280 let's call it as 95 00:07:58,520 --> 00:07:59,530 semantic. 96 00:07:59,570 --> 00:08:04,610 square dot or rollers 97 00:08:07,610 --> 00:08:09,140 and within the controllers. 98 00:08:09,140 --> 00:08:12,320 Let's introduce one called bookmark controller 99 00:08:15,830 --> 00:08:24,230 also controller will be a singleton even framework's NBC even spring for example if you pick up spring 100 00:08:24,530 --> 00:08:31,550 spring has a MVC framework and it has controllers in the framework and all the controllers over there 101 00:08:31,550 --> 00:08:33,900 are also by default singleton. 102 00:08:34,190 --> 00:08:35,830 So lets be consistent with that. 103 00:08:35,850 --> 00:08:38,160 And let's create a single controller. 104 00:08:38,390 --> 00:08:45,580 So for that we need to have a private constructor we know that. 105 00:08:46,920 --> 00:08:48,450 OK. 106 00:08:48,530 --> 00:08:50,090 Now we also need to create 107 00:08:53,030 --> 00:08:56,660 a variable that would hold the instance psycho-BS static 108 00:08:59,240 --> 00:09:03,520 instance. 109 00:09:07,480 --> 00:09:08,650 OK. 110 00:09:09,110 --> 00:09:15,200 Now we need to provide a public global access point. 111 00:09:15,290 --> 00:09:29,750 So it will be static Skop is here see your instance. 112 00:09:30,080 --> 00:09:34,160 So thats the controller related code and we need to 113 00:09:37,520 --> 00:09:40,480 know that. 114 00:09:40,950 --> 00:09:53,860 Also this and car create a method called Save user bookwork because its a user's bookmark and that's 115 00:09:53,870 --> 00:10:00,390 past user and the bookmark that was randomly selected. 116 00:10:02,360 --> 00:10:12,100 But since we don't have that method there will be using the suggestion here not a creation tradition 117 00:10:12,120 --> 00:10:12,170 . 118 00:10:12,190 --> 00:10:16,730 So that's what we have now so the control is in control now. 119 00:10:16,960 --> 00:10:25,350 And from the controller we need to invoke the manager so manager as the service layer part of service 120 00:10:25,510 --> 00:10:25,600 . 121 00:10:25,620 --> 00:10:28,550 And it has a real business logic. 122 00:10:28,690 --> 00:10:29,620 So yes. 123 00:10:29,920 --> 00:10:34,570 And let's go into the same user bookmark. 124 00:10:34,560 --> 00:10:39,130 So same signature as this particular matter and user 125 00:10:41,490 --> 00:10:42,930 bookmark. 126 00:10:43,600 --> 00:10:45,260 So this matter is also not there. 127 00:10:45,280 --> 00:10:50,120 So we're going to auto created now. 128 00:10:50,230 --> 00:10:54,950 So we have this now within bookmark manager. 129 00:10:55,180 --> 00:10:57,470 So we need Guerard the real business logic right. 130 00:10:57,490 --> 00:11:03,910 And if you recall we already have this matter on this entity called user bookmark so it maintains the 131 00:11:03,910 --> 00:11:08,830 association between a user and bookmarks so we're going to instantiate that 132 00:11:12,990 --> 00:11:19,280 gay and user bookmark has a second method called user. 133 00:11:19,300 --> 00:11:31,990 So I'm going to use that and new user bookmark also has a certain method for bookmarks so you are also 134 00:11:31,990 --> 00:11:33,420 using that. 135 00:11:34,360 --> 00:11:39,040 And from here we need to pass this particular object to doll. 136 00:11:39,250 --> 00:11:42,310 So we have the bookmark doll and this class. 137 00:11:42,310 --> 00:11:45,940 Here are the top bookmark down. 138 00:11:46,000 --> 00:11:52,230 So we are just going to pass it to a new method called C.. 139 00:11:52,380 --> 00:11:53,140 Bookmark 140 00:11:55,940 --> 00:11:57,980 Missee user bookmark. 141 00:11:58,600 --> 00:12:05,090 But it will accept this parameter called user bookmark. 142 00:12:05,290 --> 00:12:08,480 So that's the entity. 143 00:12:08,650 --> 00:12:15,340 So let's just use auto create feature once again and discreate has created this method. 144 00:12:15,400 --> 00:12:24,670 Now from here the dollar typically we have some SU l r r r which Q R in higher which is a query language 145 00:12:24,670 --> 00:12:25,480 for hibernate. 146 00:12:25,630 --> 00:12:28,770 So one of those queries to insert into the database. 147 00:12:28,840 --> 00:12:36,070 So since we don't have that we need to use this data storage right and we can either create a new method 148 00:12:36,100 --> 00:12:43,610 call add and we can pass this thing with matter use or bookmark. 149 00:12:43,630 --> 00:12:47,400 So it's like adding to the database inserting in the database. 150 00:12:47,410 --> 00:12:48,550 So and since it's not there. 151 00:12:48,580 --> 00:12:53,050 Once again let's go ahead and nicely auto created. 152 00:12:53,410 --> 00:12:57,940 Now this value will be added can be stored. 153 00:12:58,000 --> 00:13:07,960 And this are they do this optical use or bookmarks but we need to slow the user a particular user will 154 00:13:07,960 --> 00:13:15,490 be will be bookmarking bookmarks and other users will also be bookmarking bookmarks in a similar way 155 00:13:15,500 --> 00:13:15,740 . 156 00:13:15,970 --> 00:13:22,010 So we need to have an index on that index needs to be incremented right with each added bookmark. 157 00:13:22,210 --> 00:13:24,240 So if you need an index over there. 158 00:13:24,250 --> 00:13:27,040 So let's just create an index. 159 00:13:27,060 --> 00:13:36,820 It's a great read static and since it's a bookmark index it's going to just bookmark and next and it's 160 00:13:36,820 --> 00:13:38,860 initialized with zero. 161 00:13:38,860 --> 00:13:51,430 Now let's go back to the matter and let's see user marks and bookmark next. 162 00:13:51,490 --> 00:14:01,690 Now you add this value here user bookmarks are not stored but many do also increment bookmark index 163 00:14:03,340 --> 00:14:06,870 so that it's ready for the next bookmark. 164 00:14:07,240 --> 00:14:10,980 OK so that's all there is to this. 165 00:14:10,990 --> 00:14:16,200 So from controller you're passing to manager from Manager we are passing it or door from door we're 166 00:14:16,220 --> 00:14:17,110 passing it. 167 00:14:17,200 --> 00:14:20,760 We are inserting it in the database now and the view. 168 00:14:20,800 --> 00:14:26,980 Let's actually print this matter let's have six out. 169 00:14:27,590 --> 00:14:36,460 Sorry controlled space and that's read this bookmark which means this user is printing this bookmark 170 00:14:37,570 --> 00:14:44,310 and launches here that sort of code and you line statement here. 171 00:14:44,440 --> 00:14:49,010 So that's it I guess let's just go ahead and run this program launch. 172 00:14:49,010 --> 00:14:50,790 And there you go. 173 00:14:51,790 --> 00:14:53,350 So you have this. 174 00:14:53,380 --> 00:14:56,350 So this is the loading data step. 175 00:14:56,380 --> 00:14:57,640 We have already seen that. 176 00:14:57,640 --> 00:15:02,130 So this is the bookmarking step and user Zillah's bookmarking here. 177 00:15:02,170 --> 00:15:07,810 So these are the firewall marks that are randomly associated assigned to this user. 178 00:15:07,990 --> 00:15:11,080 And here is a rambling book about blink blink blink. 179 00:15:11,170 --> 00:15:13,220 And this is where the second user. 180 00:15:14,080 --> 00:15:17,530 And third for first users. 181 00:15:18,130 --> 00:15:20,830 So that's about it and everything is done randomly. 182 00:15:20,830 --> 00:15:27,670 So if we run this again you'll see that it's a different output because of the randomization that we 183 00:15:27,670 --> 00:15:28,360 are using. 184 00:15:28,360 --> 00:15:32,790 So this time it's two more weeks two books and one movie for the first user. 185 00:15:33,610 --> 00:15:36,470 So that's the thing. 186 00:15:36,550 --> 00:15:39,440 So that's some good functionality that we want. 187 00:15:39,820 --> 00:15:43,000 I hope you implemented it with me in parallel. 188 00:15:43,210 --> 00:15:47,480 If not please go ahead and do it as soon as you get a chance. 189 00:15:47,710 --> 00:15:48,510 OK. 190 00:15:48,820 --> 00:15:53,890 OK then see you in the next lesson and we will continue extending the project.