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All of the initial setup for our expiration service is complete.

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So I can start to focus on the actual application logic we're going to implement this in kind of a top

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down approach.

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We're going to first focus on creating a listener to watch for the order created event.

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Well then make sure that we start to set up something with bold J.S. then eventually create our publisher

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for the expiration complete event.

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So let's first get started with the order created listener inside of my expiration service in the SLC

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directory.

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I'm gonna make a new folder called events inside.

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They're going to create a new folder of listeners and then inside of that I'll make a new file of order

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created listener dot t yes

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so this listener is going to be very similar to all the listeners we've put together before.

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We're gonna subclass our listener base class we're gonna set up the on message function and then run

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some business logic inside.

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They're pretty straightforward.

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We've gone through this several times so let's just get right to it.

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First off I'm going to get my listener base class from my coming module I'll then exports a new class

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called order created listener.

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That's going to be extending the listener

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and then we can pretty much allow touch script to guide us from there.

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Just in case you forgot how all this stuff comes together.

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So once again immediately we've really been through this.

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No we have to plug in the type of event that we want to listen for so long once you get the order created

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events plug it in as a generic type

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we will then be told that we have to supply on message cougar name and subject.

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Let's take your subject first so I'll get my subjects in enum and then say that subject is going to

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be up type subject stocks order created and its value will be subject stocks order created then our

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Q group name.

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Once again we will create a Q Group Name inside of a separate file just to avoid any typos.

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I don't really expect to have any other listeners but it's still nice to follow the same pattern inside

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the listeners directory.

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I'll make a new folder of Q Group Name that.

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Yes sorry I think I might I said folder meant they file a file of Q group name.

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Yes and then I will export concept you group name and we'll give this one a name of expiration service

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back over and the listener at the very top.

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Let's get our Q Group name

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from that file we just created assign it as a property to the class

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and then define our on message function as usual this thing is gonna receive two arguments so data that

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would be of type order created events specifically the data properties.

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So order created event at data

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and then our message which we have type message and that is coming from the node Nat streaming library

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okay.

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So good start.

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Well that is pretty much it.

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Or step number one right here.

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So from here on out we're going to start to focus on exactly how we work with James and how we're going

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to tell it to remind us to do something in 15 minutes.

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Let's start to get a deeper overview of what's going on with the ball ust library in the next video.