Database Reference
In-Depth Information
head of the queue obtain a reference to the queue head and then listen or wait for messages
to be placed on the queue. As and when a message is placed on the queue, it will be read and
removed from the queue by the listening consumer.
2. Publish and subscribe : This involves the use of topics and supports many-to-many communi-
cation between producers and consumers. Topics are analogous to newsgroups and consum-
ers subscribed to one or more topics. As and when producers publish messages to topics, a
separate copy of a message is sent to each consumer.
11.2.3.4.3.4 JavaMail — JavaMail enables the sending and receiving of e-mail from within a
Java program. It provides APIs that enable creation of MIME message objects that can be sent and
received using the underlying mail protocols like SMTP, POP3, and IMAP4. It is a form of an
asynchronous mail though slower than JMS and is used mainly for interaction between end users.
11.3 Summary
In this chapter, we discussed tools and techniques for custom development in ABAP and Java. For
ABAP custom development, we describe an overview of ABAP, ABAP Objects, Web Applications
Builder, and Business Server Pages application development environment. With regard to Java
custom development, the chapter gives an overview of SAP Java Development Infrastructure
(JDI), NDWS tool and perspectives, and the J2EE platform.
Search WWH ::




Custom Search