Red Hat Web Application Framework 6.1 Instrukcja Użytkownika Pobierz pdf (Strona 147)

Chapter 11. Services Tutorials 133

// Attach some content fetched from a URL

URL url = new URL("http://www.yahoo.com/");

MessagePart part = new MessagePart("Yahoo", "Yahoo index page");

part.setDataHandler(new DataHandler(url));

msg.attach(part);

// Attach a simple text document

msg.attach("Some additional text", "file.txt", "description);

// Save the message

msg.save();

// Send the message to the recipient

User to = getRecipient();

Notification n = new Notification(to, msg);

n.save();

11.3.3. Creating an Hourly Digest

Applications that send frequent notiﬁcations to users are often designed to group those messages

into a digest. A common example is a workﬂow application that sends users a summary of new and

completed tasks every hour.

The notiﬁcation service supports using an explicit digest. After creating a digest, you can use it to

send future notiﬁcations by passing the digest to the notiﬁcation constructor. All messages sent to a

user through the same digest will be combined into a single outbound message when the digest is next

processed.

// Party responsible for sending the digest

User from = getDigestSender();

String subject = "my-digest";

String header = "Recent messages";

String footer = "To unsubscribe, visit

http://mysite.net/unsubscribe";

Digest digest = new Digest(from, subject,

header, footer);

digest.setFrequency(Digest.HOURLY);

digest.save();

// Create a couple of notifications and send

// them using the hourly digest

Notification n0 = new Notification(digest, user,

from, "Subject0", "Body0");

n0.save();

Notification n1 = new Notification(digest, user,

from, "Subject1", "Body1");

n1.save();

These two separate notiﬁcations will be composed into a single email message and sent to the user

during the next run of the digest queue manager.

Applications typically create their digests when they are installed, and then use them as part of pro-

cessing alerts for users.

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