To display statistic information about processed transactions

The goal of the system is to display statistic information about processed transactions. A transaction record will contain the following fields: ID - A String representing the transaction id Date - The date and time when the transaction took place (format "DD/MM/YYYY hh:mm:ss") Amount - The value of the transaction (dollars and cents) Merchant - The name of the merchant this transaction belongs to Type - The type of the transaction, which could be either PAYMENT or REVERSAL Related Transaction - (Optional) - In the case a REVERSAL transaction, this field will contain the id of the transaction it is reversing.

The system will be initialized with an input file in CSV format containing a list of transaction records. ( org.deb.loader.CSVLoaderImpl )

Once initialized, the system should report the total number of transactions and the average transaction value for a specific merchant in a specific date range. Another requirement is that, if a transaction has a reversing transaction, then it should not be included in the computed statistics, even if the reversing transaction is outside of the requested date range. ( org.deb.analysis.Analysis )

For the sake of simplicity, you can assume that Transaction records are listed in correct time order. The input file is well formed and is not missing data.

mvn clean install 

mvn exec:java -Dexec.mainClass="org.deb.App"

or execute ./run.sh

• org.deb.loader.impl.CSVLoaderImpl - loadTransactions method returns all PAYMENT transactions which are without any REVERSAL from csv file.

• org.deb.analysis.Analysis - Analyze transactions.

• org.deb.loader.CSVLoaderImplTest - to test CSV loading.
• org.deb.analysis.TransactionAnalysisTest - to test Transaction analysis.

• opencsv - to read CSV files.
• org.openjdk.jmh - to do micro benchmark.

java -jar target/benchmarks.jar