Java Reference
In-Depth Information
Chapter 24. The Resource Adapter Example
The
mailconnector
example shows how you can use a resource adapter, a message-
driven bean (MDB), and JavaServer Faces technology to create an application that can send
email messages and browse for messages. This example uses a sample implementation of
the JavaMail API called
mock-javamail
. The resource adapter is deployed separately,
while the MDB and the web application are packaged in an EAR file.
The following topics are addressed here:
• “
The Resource Adapter
”
on page
463
• “
The Message-Driven Bean
”
on page
464
• “
The Web Application
”
on page
464
The Resource Adapter
The
mailconnector
resource adapter enables the MDB to receive email messages that
are delivered to a specific mailbox folder on a mail server. It also provides connection fact-
ory objects clients can use to obtain connection objects that allow them to synchronously
query email servers for new messages in a specific mailbox folder.
In this example, the MDB activates the resource adapter, but it does not receive email mes-
sages. Instead, this example allows users to synchronously query an email server for new
messages.
The components of the resource adapter are as follows:
•
mailconnector.ra
: Base class of the
mailconnector
resource adapter
•
mailconnector.ra/inbound
: Classes that implement the inbound resource
adapter, which supports delivery of JavaMail messages to MDBs
•
mailconnector.ra/outbound
: Classes that implement the outbound re-
source adapter, which supports synchronous queries to email servers
•
mailconnector.api
: Interfaces that are implemented by MDBs associated
with this resource adapter and by the
Connection
and
ConnectionFactory-
interface
s provided by the outbound resource adapter
•
mailconnector.share
: JavaBeans class that implements the
Connec-
tionSpec
interface, allowing properties to be passed to the outbound resource ad-
apter
