From a DDD perspective is a report generating service a domain service or an infrastructure service?
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Published on 2014-05-13T08:21:15Z
Indexed on
2014/05/26
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Let assume we have the following service whose responsibility is to generate Excel reports:
class ExcelReportService{
public String generateReport(String fileFormatFilePath, ResultSet data){
ReportFormat reportFormat = new ReportFormat(fileFormatFilePath);
ExcelDataFormatterService excelDataFormatterService = new ExcelDataFormatterService();
FormattedData formattedData = excelDataFormatterService.format(data);
ExcelFileService excelFileService = new ExcelFileService();
String reportPath= excelFileService.generateReport(reportFormat,formattedData);
return reportPath;
}
}
This is pseudo code for the service I want to design where:
fileFormatFilePath
: path to a configuration file where I'll keep the format of my excel file (headers, column widths, number of columns,..etc)data
: the actual records returned from the database. This data
can't be used directly coz I might need to make further calculations to the data before inserting them to the excel file.ReportFormat
: Value object to hold the report format, has methods
likegetHeaders()
,getColumnWidth()
,...etc.ExcelDataFormatterService
: a service to hold any logic that need to be applied to the data returned from the database before inserting it to the file.FormattedData
: Value object the represents the formatted data to be inserted.ExcelFileService
: a wrapper top the 3rd party library that generates the excel file.
Now how do you determine whether a service is an infrastructure or domain service?
I have the following 3 services here:
ExcelReportService
, ExcelDataFormatterService
and ExcelFileService
?
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