Welcome back.
In this step let's get a quick overview of the two micro services we'd be using going forward for Docker and also for other things.
In this course we have two micro services.
One is called Currency conversion service and the other one is called currency exchange service.
The currency exchange service determines what is the value of one currency in another currency.
If you ask the currency exchange service I would want the value of one you as the INR.
It would return a value of sixty.
You can ask what is the value of one you are in INR it would turn 70 over here USD transfer dollars you are stand for euro you these Australian dollars INR is Indian rupees.
So the currency exchange service helps you to convert one currency into another currency.
The currency conversion service on the other hand helps you to convert a basket of currencies.
You can ask the currency conversion service what is the value of 10 USD in INR and it would return 600 back.
So these are two simple macro services which talk to each other to understand the request format and the response format of these specific macro services.
Let's go to the github repository of these codes.
If you go to the repository of course and go to these section projects and oh here if you go into micro services and scroll down a little there's a little bit of documentation about these micro services.
We have intentionally kept these macro services simple because we would want to focus on the tools we want to focus on Docker community CCD and we would want to focus on building the infrastructure needed around these micro services.
That's why these micro services are really really simple.
The currency exchange service as I discussed earlier you can ask it what is the value of 1 USD in INR to return back 60.
The overall pattern looks something like this.
So we can see localised a thousand currency exchange from each one to iron that and the response which comes back is something like this.
So it would return from EU wide liner the conversion multiple is 75.
The currency conditions are based on the other hand is used to convert a basket of currencies.
Here's the URL.
So I would want to do currency conversion from me you are to INR off quantity then what is the response which comes back.
So from each other to INR quantities then it gets back a conversion multiple of 75 so it quality currency exchange service it gets a conversion multiple of 75 back and it calculates the total calculated amount which is 750.
So the currency conversion service if it needs to identify the value of a basket of currencies let's say then USD it would call the currency exchange service and ask what is the value of 1 USD in a specific currency and then it would take that value and multiply it by.
One of the interesting questions is how does currency conversion service note the location of a currency exchange service but only talk about macro services.
One micro service needs to know where the other micro service is present and all here what we have done is we have created and we don't mean variable.
So you can create the environment variable on the currency conversion service specifying what is the location of currency exchange service the details of it are also present in the github repository.
So the environment variable name is currency exchange service host.
So it is need to configure the service to host the host of the currency exchange service as an environment variable in currency conversion and you would be able to talk to the currency exchange.
While this might sound a lot of theory in the next step let's try and get this up and running.
I'll see in the next step.