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

javamail usage

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

1st Try

public class Mail {
public void sendEmailWithCsvFile(String from, String to, String subject,
String body, List<String> csvFileLines) {
Properties props = new Properties();
props.put(\"mail.smtp.host\", \"localhost\");
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 + \"\\n\");
part2.setContent(buffer.toString(), \"text/csv\");
part2.setFileName(\"file.csv\");
Multipart mp = new MimeMultipart();
mp.addBodyPart(part1);
mp.addBodyPart(part2);
msg.setContent(mp);
Transport.send(msg); }
}

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

2nd Try

public class Mail {
public void sendEmailWithCsvFile(String from, String to, String subject,
String body, List<String> csvFileLines) {
Properties props = new Properties();
props.put(\"mail.smtp.host\", \"localhost\");
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 + \"\\n\");
Attachment csvFile = new Attachment(\"file.csv\", buffer.toString());
message.attach(csvFile);
mailService.send(message);
}
}

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

3rd Try

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 + \"\\n\");
Properties props = new Properties();
props.put(\"mail.smtp.host\", \"localhost\");
MailService mailService = new MailService(props);
mailService.newMessage()
.from(from)
.to(to)
.subject(subject)
.body(body)
.attachTextFile(\"file3.csv\", buffer.toString())
.send();
}
}

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

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

what just
happened?

Noise Reduction

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

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

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

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

the goal

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

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

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

the techniques

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

“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.

“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.

Thanks
http://fragmental.tw

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