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Building Real-Time Applications with Ember

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because in the end of the line and I certainly about building a real-time applications the number of 1st you know little moment you do so I and see if
I am instructor at the School of software and design of Denver Colorado We are a not-for-profit 7 months intensive developer training program so if you're interested in mentoring of Young's of aspiring developers please come talk to me after this as a teacher that like teachers also with what we have of so we do something which rails I would use JavaScript and most importantly we December so even if you just get a our you know more than somebody's intuitive adaptive and I really I really advocate for how much you will learn how much your skillful level of working with the side of also also of your is higher in the new development also partly I gotta developers for so I have been working with member of about 18 months I think will how much is change our decision to do it choose Amber as a framework that I want learn came like most things in my life through exhaustive of laborious comprehensive research as you can see the value
of the I did get a favored prominent your inside and that should be no surprise if tweeted anything with word JavaScript and it that you're probably familiar with but I did initially only get 1 hour 1 response the feeling funded by the size of a device or the device and I definitely believe it was the right choice for me there are somebody else did respond there on think you needed of the framework will know it always there's always somebody I series 3 major considerations when choosing a framework to work with other 1st is the the merits of the technology itself that is 1 of the 3 the other 2 are the core team's priorities in a static right does that like jive with my own in this case a debt believe that's true and finally the community is the community of and I think of over from the keynote on yes we've seen that all 3 of these are they really solidly numbers there some very excited to be working with Member so where the little about
building real-time applications the number of and work is a framework for building and this is apps and I will the philosophy that real-time applications Beverly fall under the category of ambitious so on 1 hand this
is a story about WebSockets on the other hand it's not just a story about WebSockets it's a story about any kind of browser functionality 1 integrating to application it's a story about what that is as much as the story about the location as much as a story about user sessions as much as the story about the Web Audio API it's also start working with third-party libraries that expressly written with Amber in mind so in this case we're to going
to be a hero in the in telling the story so we should probably just make sure on the same page with what a WebSocket actually I have a really good question and luckily have very straightforward answer website resonated to be and then about orbitals
is the base all reporting is analyzed another 1 by the idea that our thesis supported by
the majority on the at the new me
more specifically the traditional way that we work with web applications is the request response cycle we make a request to the server does whatever the service that people do we get a response we can work with that response right the problem is that of stuff happens in changes on the server the server does anyway to tell us if it has to wait for another request and then it the send new information so as I said a list by like holding every like 5 10 seconds and like trying to make believe the real-time applications at a website is more like a 2 way to across the Internet where the server can send messages when it has new things to tell the client the kind can then respond to those messages
so what aware that is used for collaboration on documents are analytics dashboards thing movements and yesterday like it to be really useful if your app is actually like out of date and change you 1 like prompt the user to like bring in a new version the application you can send a message over a WebSocket but in this case I think that the whole world and of our real-time applications is the chat on the message the application so we have the will of the other 2 that
the 1st is a kind of a quick demo of wedlock it's an action here we've got
a life if they say given the streaming Twitter API as it hits the server they WebSocket pushes that tweet up to Member which does its thing and brings it into the model and updates the application according so if you ones say like hi mom having a strain as yeah hello world gold so they are they about some fancy are technology is can we actually use it is some kind of of Chrome Canary Firefox Nightly thing or is this widespread available whatever the my user comes the site and I have a website where they can be able to take advantage of that this is the most
part yes with my apologies to the opera many users but I think you used to it at this point it but it in there and you see we have a little red it in some earlier the but brother Luba red is an earlier version of Internet Explorer if you do need to target these older brothers you not actually out of lot others a lot
libraries so actually do backward compatibility is level is also really great because they will give you fall back to you can make a solid website connection will fall back to long polling Bill fall back to FlashSocket that we need to the I O a library for a new our virtual library for both node as well as directly through the applications but this is not like languages because this instance of whatever your server-side language choices there's a library that supports that I've also heard that rail 5 going supported by a gold so now that we are
experts on 1 side of the wall of the resonator is the endorsed each other uh let's actually let's actually go for and begin to implement
these this is ultimately what will gonna build up by the end of the 1st iteration it's a very simple to add application you put in new name right put in any name because and that and the images often of putting in a a message there some Billsus the same thing that pushes to your application of this is
a brief sample of what we start with some boilerplate of the like thousands this is a very lonely chat room right now as you see there's no WebSockets volvió even doing this term now is talk itself which is what I feel like I don't wanna most the time so as not much different also works you can begin to add to this a little bit but before we knew that this is
not a lot of work that it's aware we do what we do is service gonna push those web is so again actually reacted so we start with a very
simple WebSocket server 14 lines i and again a language you want any framework logical but I didn't know that maybe assumption we're all familiar with JavaScript programming language I sold due to acquire
all the website library will observer ETAT on any new connection will bind an event when a message comes from connection will broadcast that message was amended broadcast methods will he is take all the kinetic Alliance awarded ascended to them to their clients over the web so what is this
traditionally look like on the like has had you would normally work of websites I to look at the 2nd I documentation and grab like their Hello world for a of client and the that but it's pretty
straightforward you the readers and dont reversal whereas from an input we're going to get the value that we're going hand a list item and what I believe is another element that you
how the this finding this example it's OK however we sing wheezing were discussed with leads this road leads to the outer most of America
article selector based programming which is less likely develop an application more more like you're running around the damn light tried update stuff and move stuff around often moves that to give the illusion that you have web application we do better within the love
that M R is that allows me to build my application and then the dog becomes a representation of the same application I'll have to run around into all these it's and have to so it's a
totally different approaches of the 1st is
we use a stand-alone controller and that's going to would
assist that with Amber generate controller website and this is going to give us a
new file called AP controllers WebSocket but
in here water will talk to the code despite intensive physical we look at all the on all like in this where Sarah with an array of we will assume some pretty intense that uh we're going to with this like list of callbacks this list of subscribed like functions that we wanna call on every message and what will do is will expose yourself a subscribe function put something or register a callback and loss of an unsubscribe function function that will register of a called In here was only make a connection to a server when a message comes in and will pass that message and will call all the registered callbacks the other thing we did was subscribe unsubscribe Walter give us overnight abstraction to send a message
of sonar Jeroen but actually get from other people here what will do is was that we
need this new website control will say we do we rely on an election make it available to us under control is that WebSocket which we're going user-computer alias to I give ourselves a cleaner interface to but then he will use we can impose ascribed where will actually that we we need to name functions that we can the register it later so will have a function that receives messages which will simply take the message and pop it onto our model starts out you're right we will then use website control and subscriber new function we'll also descending on our on our way out of their controllable clean up after the and finally when a message gets emitted will actually send it to the server over what lastly we just
we we wider of which is needed upon in terms of off are we only have 1 control this obligation but this would be useful we have more than 4 will
simply on a weighing on each other around we'll call that describe method on the sharing controlling and on the way out we will again we that so let's see that
in action this show that here 0
I will do goal so we can say that I I'm getting trolled remotely and so the system works yeah others about a great
years ago that it works somewhat limited right right how words between controllers what happens if we want have a 7 component or whatever the we want to bring our stock into our models right of this approach is isn't isn't well suited for that of
the best thing about being married community is that you share the struggles together right you're not the only 1 that feels some spent time actually I mean oppose about 11 months ago was on the called service which would be kind of a way to bring the functionality in other places in your application so let's
actually refactor our code where factor to take it out of the stand-alone controller all moving into a service are very
similar approach will Amber generate service web that it other to files in amber 0 115 in is I have heard from objective that in 0 . 2 you will not get that 2nd file
which will talk about that here and we will use but what it does is
it takes a service and injects it in this case is injected into every round and so the service would be available in every round we want and there will never controller you that you available in just the charity controller you can do that as well whenever right will actually amber 110 gives a new syntax rated and that I think is a minimum 1 of
so how do we refactor this controller into service that we is inherent now so that we just moved into this you follow generated and we have a member of the I will get rid of the controller only more
and we do need update error-control
and so we you take out the logic that relies on a stand-alone controller and we're going to instead WebSocket is going to be amber inject service of the light among you might notice that I did mention in passing a service that whatever will do in 110 will look at the name of property and say hey you define reflect problem on what the WebSocket server dividing this probably sandwich then I would have to be a little bit more explicit that's also terrible and that that
we've now refactored are similar controller into a service so
let's get right now we're very Panella WebSocket implementation unthinkingly pull another party libraries library right after the walls and will come to think of it as something that has to offer point of interest socket I know
it has all the client side libraries and server-side library news service library in the server was 11 point at the end of separate them
out so what lottery factor a server to
each user and I O on the server side is the edge
of my 41 WebSocket server it is now 9 lines if you only like the 6 lines effectively so I can in various sources like and chatrooms or rooms and channels and all wanted different options as well as like events for connection and disconnection is just so this is an example of different events that you can kind of buying
I will also all that on the client is just so the client side library and all we do is not
while will be imported into Arbil process so when we build a application is included of finally so
you are actually doing a whole bunch of changes to your Services need to bring in this library is simply never have a ring in this upload Client library exposes an I global that you can just kind of use on the show you can be stripped down of service with the hope that the Niger so you have a burning desire in your heart right now to make a real time application maybe you're more interested in geo-location should be like the bare minimum so you can see what that would look like so
here was simply exposing the other 1 socket connection with major so on and on and we actually key that sugary sand method as well as some stuff back over the side OK so
it's going to with for that was something that we could do with this is that we can bind all sorts of
different of events we do have some they connects disconnects if they press the party button because area that is a part of a variety so we're try 1 thing so
in our time together I suspect that more and so
avoid a game called out what is your favorite after pages options on and is not equal man semicolons as a whole are double equals that the type of man is the number the US 4 or else and if you're interested you can play along at home by going to bit
flat jails all and should
should you to the conference Wi-Fi permitting but you should be able to cast a vote I'm about to this should call however some connections weighted by so big programs instance of what
so thank you very much because of the terms of online and the performance of the of the e-mail me and my students thank you of like from the sum of the forces and
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Metadaten

Formale Metadaten

Titel Building Real-Time Applications with Ember
Serientitel Ember Conf 2015
Autor Kinney, Steve
Lizenz CC-Namensnennung - Weitergabe unter gleichen Bedingungen 3.0 Unported:
Sie dürfen das Werk bzw. den Inhalt zu jedem legalen und nicht-kommerziellen Zweck nutzen, verändern und in unveränderter oder veränderter Form vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen und das Werk bzw. diesen Inhalt auch in veränderter Form nur unter den Bedingungen dieser Lizenz weitergeben.
DOI 10.5446/34725
Herausgeber Confreaks, LLC
Erscheinungsjahr 2015
Sprache Englisch

Inhaltliche Metadaten

Fachgebiet Informatik
Abstract In this session, we'll investigate a few strategies for integrating browser features like WebSockets as well as third-party libraries into our ember-cli applications. We'll look at how to structure an application using standalone controllers, initializer objects, and services. Our example application will be a real-time chat application that uses WebSockets to push notification to connect clients. We'll build the application with native WebSockets and talk about how to leverage external libraries like Socket.io and Faye.

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