Overview
Clojure is a passionate language that uses strong mathematical expressions for you to write a code, I think it’s cool. I am not a language expert, in fact in any language, I have a general profile, I decided to create a small banking application for study and testing purposes.
Tools
Dexter’s labs:
I’ve used clojure with Leiningen and use the Emacs editor that perfectly matches with Clojure. For more information check here:
- https://www.braveclojure.com/basic-emacs/
1. Project Design
The idea of the small bank is to create a Rest API using Clojure, where the user can do:
- Create a new account if there is no.
- The user can put money into this account.
- The user can withdraw money from the account.
- The multi-threaded system controls the concurrency of multiple concurrent accesses.
- The operation is using a Rest Api.
- Check account balance.
1.1 Start
I did tests on the FreeBSD / Mac OS and Ubuntu operating systems you can download the project:
1 | git clone https://github.com/edersoncorbari/small-bank.git |
Now you need to raise the HTTP server.
1 | ./launch-app |
By default the server uses port 3000. On another terminal run the curl response test:
1 | ./launch-curl |
You should get the following outputs in response:
001 002 003 004 005 006 007 008 009 010 011 012 013 014 015 016 017 018 019 020 021 022 023 024 025 026 027 028 029 030 031 032 033 034 035 036 037 038 039 040 041 042 043 044 045 046 047 048 049 050 051 052 053 054 055 056 057 058 059 060 061 062 063 064 065 066 067 068 069 070 071 072 073 074 075 076 077 078 079 080 081 082 083 084 085 086 087 088 089 090 091 092 093 094 095 096 097 098 099 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 | -------------------------------------------------------------------------------------*** Simple Rest API to Check/Balance Small-Bank ***Please use the (curl-api-test) script for testing.-------------------------------------------------------------------------------------Add money account: 1 -> Crediting: 316.22776601683793319988:> Successful transactionAdd money account: 2 -> Crediting: 447.21359549995793928183:> Successful transactionAdd money account: 3 -> Crediting: 547.72255750516611345696:> Successful transactionAdd money account: 4 -> Crediting: 632.45553203367586639977:> Successful transactionAdd money account: 5 -> Crediting: 707.10678118654752440084:> Successful transactionAdd money account: 6 -> Crediting: 774.59666924148337703585:> Successful transactionAdd money account: 7 -> Crediting: 836.66002653407554797817:> Successful transactionAdd money account: 8 -> Crediting: 894.42719099991587856366:> Successful transactionAdd money account: 9 -> Crediting: 948.68329805051379959966:> Successful transactionAdd money account: 10 -> Crediting: 1000.00000000000000000000:> Successful transactionAdd money account: 11 -> Crediting: 1048.80884817015154699145:> Successful transactionAdd money account: 12 -> Crediting: 1095.44511501033222691393:> Successful transactionAdd money account: 13 -> Crediting: 1140.17542509913797913604:> Successful transactionAdd money account: 14 -> Crediting: 1183.21595661992320851346:> Successful transactionAdd money account: 15 -> Crediting: 1224.74487139158904909864:> Successful transaction-------------------------------------------------------------------------------------Get balance account: 1{"account":1,"date":"2018-11-04T18:27:18.915-03:00","balance":316.22776601683796}Get balance account: 2{"account":2,"date":"2018-11-04T18:27:18.929-03:00","balance":447.21359549995793}Get balance account: 3{"account":3,"date":"2018-11-04T18:27:18.939-03:00","balance":547.7225575051662}Get balance account: 4{"account":4,"date":"2018-11-04T18:27:18.949-03:00","balance":632.4555320336759}Get balance account: 5{"account":5,"date":"2018-11-04T18:27:18.961-03:00","balance":707.1067811865476}Get balance account: 6{"account":6,"date":"2018-11-04T18:27:18.972-03:00","balance":774.5966692414834}Get balance account: 7{"account":7,"date":"2018-11-04T18:27:18.982-03:00","balance":836.6600265340755}Get balance account: 8{"account":8,"date":"2018-11-04T18:27:18.993-03:00","balance":894.4271909999159}Get balance account: 9{"account":9,"date":"2018-11-04T18:27:19.004-03:00","balance":948.6832980505138}Get balance account: 10{"account":10,"date":"2018-11-04T18:27:19.017-03:00","balance":1000.0}Get balance account: 11{"account":11,"date":"2018-11-04T18:27:19.026-03:00","balance":1048.8088481701516}Get balance account: 12{"account":12,"date":"2018-11-04T18:27:19.041-03:00","balance":1095.4451150103323}Get balance account: 13{"account":13,"date":"2018-11-04T18:27:19.056-03:00","balance":1140.175425099138}Get balance account: 14{"account":14,"date":"2018-11-04T18:27:19.066-03:00","balance":1183.2159566199232}Get balance account: 15{"account":15,"date":"2018-11-04T18:27:19.083-03:00","balance":1224.744871391589}-------------------------------------------------------------------------------------Remove money account: 1 -> Debting: 31.62277660168379331998:> Successful transactionRemove money account: 2 -> Debting: 44.72135954999579392818:> Successful transactionRemove money account: 3 -> Debting: 54.77225575051661134569:> Successful transactionRemove money account: 4 -> Debting: 63.24555320336758663997:> Successful transactionRemove money account: 5 -> Debting: 70.71067811865475244008:> Successful transactionRemove money account: 6 -> Debting: 77.45966692414833770358:> Successful transactionRemove money account: 7 -> Debting: 83.66600265340755479781:> Successful transactionRemove money account: 8 -> Debting: 89.44271909999158785636:> Successful transactionRemove money account: 9 -> Debting: 94.86832980505137995996:> Successful transactionRemove money account: 10 -> Debting: 100.00000000000000000000:> Successful transactionRemove money account: 11 -> Debting: 104.88088481701515469914:> Successful transactionRemove money account: 12 -> Debting: 109.54451150103322269139:> Successful transactionRemove money account: 13 -> Debting: 114.01754250991379791360:> Successful transactionRemove money account: 14 -> Debting: 118.32159566199232085134:> Successful transactionRemove money account: 15 -> Debting: 122.47448713915890490986:> Successful transaction-------------------------------------------------------------------------------------Get balance account: 1{"account":1,"date":"2018-11-04T18:27:19.359-03:00","balance":284.604989415154167}Get balance account: 2{"account":2,"date":"2018-11-04T18:27:19.372-03:00","balance":402.492235949962134}Get balance account: 3{"account":3,"date":"2018-11-04T18:27:19.382-03:00","balance":492.950301754649586}Get balance account: 4{"account":4,"date":"2018-11-04T18:27:19.394-03:00","balance":569.209978830308315}Get balance account: 5{"account":5,"date":"2018-11-04T18:27:19.405-03:00","balance":636.39610306789284}Get balance account: 6{"account":6,"date":"2018-11-04T18:27:19.416-03:00","balance":697.13700231733506}Get balance account: 7{"account":7,"date":"2018-11-04T18:27:19.429-03:00","balance":752.99402388066794}Get balance account: 8{"account":8,"date":"2018-11-04T18:27:19.440-03:00","balance":804.98447189992431}Get balance account: 9{"account":9,"date":"2018-11-04T18:27:19.450-03:00","balance":853.81496824546243}Get balance account: 10{"account":10,"date":"2018-11-04T18:27:19.463-03:00","balance":900.0}Get balance account: 11{"account":11,"date":"2018-11-04T18:27:19.473-03:00","balance":943.92796335313644}Get balance account: 12{"account":12,"date":"2018-11-04T18:27:19.483-03:00","balance":985.90060350929907}Get balance account: 13{"account":13,"date":"2018-11-04T18:27:19.494-03:00","balance":1026.1578825892242}Get balance account: 14{"account":14,"date":"2018-11-04T18:27:19.503-03:00","balance":1064.89436095793088}Get balance account: 15{"account":15,"date":"2018-11-04T18:27:19.513-03:00","balance":1102.27038425243009} |
The above test add new accounts, then checks the balance, and then takes money out of the accounts. You can see more details of the implementation by looking at the project’s README file.
Considerations
This is project is only used for studies using clojure, developed by layman in the subject and perhaps not one of the best implementations, techniques and use of the language.
Published on Java Code Geeks with permission by Ederson Corbari, partner at our JCG program. See the original article here: A small bank application with Clojure Opinions expressed by Java Code Geeks contributors are their own. |
