Currency Exchanger Demo

Demonstration of currency exchanger

Developers

• Anatoly Cherkasov

Requirements

• Java 8
• PostgreSQL

Contents

1. Protocol - Definition of the protocol of interaction
2. Proxy CBR - Proxy to interact with a currency provider with Central Bank of Russia (CBR)
3. Currency exchanger - Produces data on currency and its conversion
4. Spring boot admin - Spring Boot Admin is a simple application to manage and monitor your Spring Boot Applications

Preparing for demo

1. Run all applications, they will be available on the URL:
   • http://127.0.0.1:8101 - Proxy CBR
   • http://127.0.0.1:8102 - Proxy NBRB
   • http://127.0.0.1:8090 - Currency exchanger
   • http://127.0.0.1:8300 - Spring boot admin
2. Automatically for the current date for the proxy will take currency rates
3. We go through the links and demonstrate the basic functionality
   • Output of all currencies
   • Output of all suppliers
   • Currency conversion
     • USD -> EUR
     • EUR -> USD
     • RUB -> USD
     • USD -> RUB
     • RUB -> RUB
   • Display currency rates for the current date
   • Show error output
4. Disable the database for an arbitrary currency for a particular vendor and show that it no longer gets
5. We disable in the database of a particular vendor and show that it no longer participates in the exchange rate
6. Turn everything back on
7. Show how to quickly add a new type of currency to the database and bind it to the supplier to get the exchange rate
8. Show how to quickly connect a new exchange rate provider proxy with individual proxy settings and how on the fly you can change the URL (Proxy NBRB)
   • http://127.0.0.1:8102/currency_rates/v1/json
   • http://127.0.0.1:8102/currency_rates/v1/soap
9. We show in the database records for rates tied to specific suppliers
10. Show the status of running applications in a spring boot admin
    • Default access: admin / admin

In conclusion:

• All the interaction of exchange rates with proxies is built on a single protocol in the same data format, which allows you to implement vendor proxy in any language by implementing a single protocol of interaction
• All settings are in the database, which does not require stopping and launching the application
• Integration is possible in any language

What else can be improved

• Add caching
• Think over the protocol of interaction more carefully
• Implement a helper library to work with the date on proxy, so as not to duplicate
• Receiving a currency on a schedule based on the configuration in the database
• Personal cabinet for managing data in the database with access by roles
• Transfer of incoming currency to a minor unit
• Start in the container and check the start of the container
• Prepare a docker-composer
• To work out possible errors and their correct output
• Interact with the database to implement on JDBC
• Beautiful documentation
• Add CI
• And much more

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