The document discusses different approaches to sending a CSV report as an email attachment using Java. It shows three attempts using different Java email libraries and techniques: 1. The first try uses JavaMail API classes like MimeMessage and MimeBodyPart to attach the CSV file. 2. The second try introduces a MailService class and uses an Attachment class to simplify the process. 3. The third try uses a fluent interface pattern with the MailService to further streamline attaching the CSV file. The document then compares the techniques and discusses using an idiomatic versus domain-driven design approach when modeling domains with programming languages.

1. Expressive
Design
(in 20 minutes)
phillip calçado
http://fragmental.tw

2. javamail usage

3. I want this CSV
report delivered
as an e-mail
attachment

4. 1st Try

5. public class Mail {
public void sendEmailWithCsvFile(String from, String to, String subject,
String body, List<String> csvFileLines) {
Properties props = new Properties();
props.put(quot;mail.smtp.hostquot;, quot;localhostquot;);
Session session = Session.getDefaultInstance(props);
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(from));
InternetAddress[] address = { new InternetAddress(to) };
msg.setRecipients(Message.RecipientType.TO, address);
msg.setSubject(subject);
msg.setSentDate(new Date());
MimeBodyPart part1 = new MimeBodyPart();
part1.setText(body);
MimeBodyPart part2 = new MimeBodyPart();
StringBuffer buffer = new StringBuffer();
for (String line : csvFileLines)
buffer.append(line + quot;nquot;);
part2.setContent(buffer.toString(), quot;text/csvquot;);
part2.setFileName(quot;file.csvquot;);
Multipart mp = new MimeMultipart();
mp.addBodyPart(part1);
mp.addBodyPart(part2);
msg.setContent(mp);
Transport.send(msg); }
}

6. Message.RecipientType
I want this CSV
report delivered InternetAddress Multipart
as an e-mail
attachment
MimeMessage MimeBodyPart
Session Properties

7. 2nd Try

8. public class Mail {
public void sendEmailWithCsvFile(String from, String to, String subject,
String body, List<String> csvFileLines) {
Properties props = new Properties();
props.put(quot;mail.smtp.hostquot;, quot;localhostquot;);
MailService mailService = new MailService(props);
MailMessage message = mailService.newMessage();
message.setFrom(from);
message.setTo(to);
message.setSubject(subject);
message.setBody(body);
StringBuffer buffer = new StringBuffer();
for (String line : csvFileLines)
buffer.append(line + quot;nquot;);
Attachment csvFile = new Attachment(quot;file.csvquot;, buffer.toString());
message.attach(csvFile);
mailService.send(message);
}
}

9. I want this CSV MailMessage Attachment
report delivered
as an e-mail
MailService Properties
attachment

10. 3rd Try

11. public class Mail {
public void sendEmailWithCsvFile(String from, String to, String subject,
String body, List<String> csvFileLines) {
StringBuffer buffer = new StringBuffer();
for (String line : csvFileLines)
buffer.append(line + quot;nquot;);
Properties props = new Properties();
props.put(quot;mail.smtp.hostquot;, quot;localhostquot;);
MailService mailService = new MailService(props);
mailService.newMessage()
.from(from)
.to(to)
.subject(subject)
.body(body)
.attachTextFile(quot;file3.csvquot;, buffer.toString())
.send();
}
}

12. send_email do
to 'pcalcado@gmail.com'
from 'bemaia@fragmental.tw'
subject 'Testing via Ruby'
body %{
Hi,
Please do not forget the milk.
Bye!
}
attachment('file4.csv') << lines
end

13. I want this CSV E-mail
report delivered
as an e-mail
Attachment
attachment

14. what just
happened?

15. Noise Reduction

16. Noise
the difference between
I want this CSV E-mail
report delivered
as an e-mail
Attachment
attachment

17. Noise
the difference between
I want this CSV E-mail
report delivered
This
as an e-mail
Attachment
attachment

18. Noise
the difference between
I want this CSV E-mail
report delivered
This That
as an e-mail
Attachment
attachment

19. Noise
the difference between
Business Analysis Design Implementation
public class Something{
Class Name Class Name
Attribute Attribute
Attribute Attribute
private String name;
Operation Operation
Operation Operation
public boolean doS(){
}
Class Name
Attribute
}
Attribute
Operation
Operation
This That

20. the goal

21. I want this CSV
report delivered
as an e-mail
attachment

22. I want this CSV
report delivered
as an e-mail
E-mail
attachment

23. I want this CSV
report delivered
as an e-mailE-mail
attachment
Attachment

24. the techniques

25. Noise
Idiomatic”
Java
Domain-Driven
Design
Internal DSL
External DSL?

26. “Idiomatic”: Focus on how to use
technical tools to solve the
problem in an efficient way.
Domain-Driven: Language is only a
tool to model the domain.
Internal DSL: Language is only an
:internal {
extensible tool to model the
DSL
domain.
}
External DSL: Language is created
based on the domain.

27. “Idiomatic”: TFocus on how to use
DO: a
O e
e d r n am
technical toolsr thato solve the
Ne te
be t t
fo
problem in an efficient way.
Domain-Driven: Language is only a
tool to model the domain.
Internal DSL: Language is only an
:internal {
extensible tool to model the
DSL
domain.
}
External DSL: Language is created
based on the domain.

28. Thanks
http://fragmental.tw

29. pics
• http://www.flickr.com/photos/bitzi/293673587/
• http://www.flickr.com/photos/sage/2143086954/
• http://www.flickr.com/photos/brianmitchell/2113553867/
• http://www.flickr.com/photos/kamaski/186266747/
• http://www.flickr.com/photos/tosawyer/43691981/
• http://www.flickr.com/photos/helderfontenele/2134684620/
• http://www.flickr.com/photos/sotto1/808195510/