This is a small sample of Java code I've written for anyone who is interested in learning about my coding style/idioms/etc. The application is a command-line order fulfillment system which accepts orders in JSON format. For simplicity and to keep the application self-contained I have not included data storage; all data is in-memory.
On starting the application listens on stdin for orders. The orders are newline-separated JSON objects with the following fields:
- orderId
- updateId
- status (one of NEW, PROCESSING, ENROUTE, RECEIVED, RETURNED, CANCELED)
- amount (only required for new orders)
| FROM | TO |
|---|---|
| NEW | PROCESSING |
| PROCESSING | ENROUTE |
| ENROUTE | RECEIVED |
| RECEIVED | RETURNED |
| (any state except RECEIVED or RETURNED) | CANCELLED |
- All orders must begin in NEW state
- Orders specifying an invalid state transition are ignored
If you want to build the project you will need apache Ant http://ant.apache.org/bindownload.cgi
Set ANT_HOME variable to wherever Ant is, and in the project root directory (the same same directory as this file) run
$> $ANT_HOME/ant clean
$> $ANT_HOME/ant
This will rebuild the executable jar from source.
When the program reads an EOF, it prints a summary of all of the orders currently in memory.
For convenience I've included an executable jar file if you don't have ANT.
To run the application you will need a Java runtime installation version 1.6 or higher.
Easiest approach is to just run:
$> java -jar order-app.jar
I've included the sample input in a text file so you can pipe the input if you like:
$> cat input | java -jar order-app.jar
The default behavior is to silently ignore malformed or invalid requests, however if you add the command line argument -Ddebug=true the failures will appear in stderr as stack traces.
The entry point for the java application is in src/org/bendra/yelptest/petespizza/Console.java main[] method
Most of the work is in a singleton class, which uses an in-memory collection to store orders and updates as they are processed: /src/org/bendra/yelptest/petespizza/service/OrderService.java
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- Gson is licensed under the Apache License, version 2.0
- JUnit is licensed under the Eclipse Public License version 1.0
- Hamcrest is licensed under the New BSD License