1 00:00:01,220 --> 00:00:01,910 Hello and welcome back. 2 00:00:01,910 --> 00:00:08,420 So let's talk about Italy just clammed up when to use it and the building blocks of the several less 3 00:00:08,450 --> 00:00:14,040 applications so someone should I use an enabling slander. 4 00:00:14,090 --> 00:00:18,570 This is an ideal compute platform for many applications in areas. 5 00:00:18,620 --> 00:00:21,760 So here is what you need to do to use the database lambda. 6 00:00:21,890 --> 00:00:28,610 You need to write your own code so you are responsible for your own code in a language that is supported 7 00:00:28,610 --> 00:00:30,780 by lambda and you said that is not jazz. 8 00:00:30,800 --> 00:00:34,020 Java C sharp and Python. 9 00:00:34,450 --> 00:00:41,680 The second thing is you should be able to run your code or be able to build the code that runs within 10 00:00:41,680 --> 00:00:46,650 database lambda standard runtime environment and resources provided by Lambda as well. 11 00:00:46,870 --> 00:00:49,150 Let's look at there are several applications. 12 00:00:49,150 --> 00:00:49,740 A little bit. 13 00:00:49,780 --> 00:00:53,110 So a typical several this application what would it consist of. 14 00:00:53,110 --> 00:00:55,510 It would consist of one or more lambda functions. 15 00:00:55,510 --> 00:01:03,670 So this is the code that you write one or more functions that are uploaded or deployed to Lambda. 16 00:01:03,760 --> 00:01:10,510 The these codes or these functions will be triggered by events events such as words such as object uploads 17 00:01:10,510 --> 00:01:16,170 to an S3 an Amazon S.A. notification an API actions. 18 00:01:16,250 --> 00:01:17,850 Is this a conclusive list long. 19 00:01:17,960 --> 00:01:24,170 There are many more services that can trigger a Lambda Lambda function and there are also manual you 20 00:01:24,170 --> 00:01:28,890 can write your own code to call API I's and to trigger a lambda function. 21 00:01:29,030 --> 00:01:32,730 You can do scheduled events for that as well. 22 00:01:32,930 --> 00:01:40,100 OK so several this application is one or more lambda functions and means to trigger them to run these 23 00:01:40,100 --> 00:01:45,740 functions or to trigger the functions to run the code and of course the code would be to serve the purpose 24 00:01:45,740 --> 00:01:46,740 of the application. 25 00:01:47,070 --> 00:01:53,720 Okay so the whole point about server lists or lambda based applications is you don't have to p provision 26 00:01:53,750 --> 00:01:58,850 and infrastructure and administer it and run it by yourself in order to run your code and applications. 27 00:01:58,940 --> 00:02:05,450 You can have lambda run that for you when needed by a trigger and the trigger is either as we mentioned 28 00:02:05,450 --> 00:02:10,370 it could be an established service could be an alarm the function triggering another lambda function 29 00:02:10,430 --> 00:02:17,540 and it could be as we mentioned a custom code or custom application that you you run could be in while 30 00:02:17,540 --> 00:02:22,570 application and computer based application that runs does API calls. 31 00:02:22,610 --> 00:02:29,600 This how we invoke the lambda functions so the lambda functions can stand alone or leverage other resources 32 00:02:29,600 --> 00:02:33,050 such as dynamic tables or Amazon S three buckets. 33 00:02:33,050 --> 00:02:39,390 The example that we just saw now the user was launching an object to an S3 bucket. 34 00:02:39,430 --> 00:02:45,890 There's three bucket triggered S3 and S3 based on the unification and configuration and it knew exactly 35 00:02:45,890 --> 00:02:49,430 which lambda function to trigger and that's how it worked. 36 00:02:49,460 --> 00:02:51,990 So S3 you were used for that. 37 00:02:52,010 --> 00:02:58,790 Now the action itself and the lambda function runs it can generate something else that will be stored 38 00:02:58,790 --> 00:03:04,610 in a dynamic DV table or it will be stored in another S3 Buckets so that that's possible as well. 39 00:03:05,150 --> 00:03:11,120 So the functions when they run they can stand alone so they could have the whole thing or leverage other 40 00:03:11,120 --> 00:03:17,060 resources from IT areas such as dynamic DB tables or is 3 buckets. 41 00:03:17,090 --> 00:03:24,050 The most basic server this application is a lambda function that's the most basic one that does not 42 00:03:24,050 --> 00:03:28,630 depend on anything around it a code that learning trans that it. 43 00:03:28,760 --> 00:03:33,040 Let's look at the building blocks of lambda application or lambda based application. 44 00:03:33,050 --> 00:03:36,620 So the first thing and the cool component is the lambda function. 45 00:03:36,620 --> 00:03:38,250 So what is the lambda function. 46 00:03:38,420 --> 00:03:39,300 It is code. 47 00:03:39,380 --> 00:03:44,480 So it is comprised of your custom code and any independent libraries required for this code. 48 00:03:44,480 --> 00:03:47,900 So it's the foundation of the lambda service. 49 00:03:47,900 --> 00:03:50,860 The second one is the event source I need to trigger that code. 50 00:03:50,870 --> 00:03:56,840 I need an event or a reason or a timing or something happens that goes and triggers the code because 51 00:03:56,870 --> 00:04:00,890 otherwise if you are not dependent on an event what will happen. 52 00:04:00,890 --> 00:04:06,140 That means either you will not have a computer at all or you will have compute all the time sitting 53 00:04:06,170 --> 00:04:08,360 idle waiting for the processing. 54 00:04:08,360 --> 00:04:08,930 Right. 55 00:04:08,960 --> 00:04:14,570 So now we are back to the easy to instance side when if we launch an easy to instance and it is running 56 00:04:14,630 --> 00:04:17,010 you're paying for it even if it's not you. 57 00:04:17,060 --> 00:04:22,340 So an Italy a service such as Amazon S.A. or custom service that could be an application that triggers 58 00:04:22,340 --> 00:04:26,180 that trigger your function and executes its logic. 59 00:04:26,180 --> 00:04:33,320 The third component is the downstream resources now an intelligence service such as dynamic DV S3 bucket 60 00:04:33,350 --> 00:04:36,050 that lambda function calls once it is triggered. 61 00:04:36,200 --> 00:04:42,680 So it could be writing information in a diamond table or saving the output into as an object into an 62 00:04:42,680 --> 00:04:43,490 S3 bucket. 63 00:04:43,490 --> 00:04:50,720 The fourth component of the lambda based applications or the several applications is the log streams. 64 00:04:50,720 --> 00:04:52,580 So what are the log streams we're talking about. 65 00:04:52,580 --> 00:04:58,670 This is when the lambda service will automatically monitor your function or function invocations or 66 00:04:58,670 --> 00:05:02,410 functions invocations and report metrics to cloud watch. 67 00:05:02,510 --> 00:05:02,930 Oh nice. 68 00:05:02,930 --> 00:05:09,350 So that means I can through the logs streams I can monitor and know what's going on with my functions 69 00:05:09,390 --> 00:05:13,780 their invocations who had requested the invocation and so on and so forth. 70 00:05:13,820 --> 00:05:20,090 And you can embed some function code within some functions or subpart part of the code in order to do 71 00:05:20,090 --> 00:05:21,750 custom logging statements as well. 72 00:05:22,290 --> 00:05:28,640 OK so it content an execution of the code at some point when everything has been done properly then 73 00:05:28,640 --> 00:05:35,000 it will say that this function was was executed at such and such read the time date and put that exactly 74 00:05:35,090 --> 00:05:40,670 that allows you to analyze the execution flow and performance of your lambda function to ensure it is 75 00:05:40,670 --> 00:05:41,610 working properly. 76 00:05:41,750 --> 00:05:47,120 So not only are launching code but your code if it is intelligent and it has same kind of functions 77 00:05:47,120 --> 00:05:49,510 you can even see the performance. 78 00:05:49,520 --> 00:05:55,550 How long did it take for that step to happen how long that step waited until the next one was executed 79 00:05:55,550 --> 00:05:56,820 and so on and so forth. 80 00:05:56,870 --> 00:06:02,980 The last one is the model itself the framework around which the several applications in enabling is 81 00:06:02,990 --> 00:06:07,450 run and this is called the several lists application model or a WSM. 82 00:06:07,460 --> 00:06:13,790 This is a model of to define several applications that we assume is natively supported by Italy s cloud 83 00:06:13,870 --> 00:06:19,450 formation and define simplified syntax for expressing several lists resources. 84 00:06:19,480 --> 00:06:25,510 OK so let's take a quick break and I will see you again and to discuss lambda function configurations 85 00:06:25,570 --> 00:06:26,670 and implications. 86 00:06:26,680 --> 00:06:27,240 I'll see you shortly.