Object-Oriented Language
: Transaction / Application / Web Servers
Intro
What is an application server? There are really many
aspects to be considered: component technology, communication
protocols, language or platform dependency, reliability,
performance, scalability, security, etc. So it seems that there
are no clear answers at the moment.
"How do objects and middleware fit together?
Middleware is a layer of software that abstracts a
company's business logic from the presentation layer at the client
side, and the data resource at the backend. Objects are a way of
modeling a business and further abstracting the business logic
from the requirements of the client and server. Object-oriented
middleware gives businesses the ability to effectively
model a business problem and deploy and manage a business
solution." (BEA Systems)
"What is an OTM ? An OTM , or Object
Transaction Manager , combines the production-ready runtime
and transaction management environment of TP Monitors with the
programming model and ease of use of object-oriented development
tools. The OTM manages the objects in a distributed
environment so developers can focus on solving business problems."
(BEA Systems)
"The standard Java transaction management interfaces
are defined in two separate standard extensions. (1) Java
Transaction Service (JTS) defines a low-level transaction
management specification intended for vendors who provide the
transaction system infrastructure required to support application
run time environment. (2) Java Transaction API (JTA)
defines a high-level transaction management specification intended
for resource managers and transactional applications in
distributed transaction systems." (Sun Microsystems)
"What is OLE Transactions ? OLE Transactions
is Microsoft's object-oriented protocol for transaction
management. The OLE Transactions protocol defines the
interfaces that applications, resource managers, and transaction
managers use to perform transactions. Applications use OLE
Transaction interfaces to initiate, commit, abort, and inquire
about transactions." (Microsoft)
"What is Enterprise JavaBeans ? Enterprise
JavaBeans is a cross-platform component architecture for the
development and deployment of multi-tier, distributed, scalable,
object-oriented Java applications. Enterprise JavaBeans can
be deployed on top of existing transaction processing systems
including traditional transaction processing monitors, web
servers, database servers, application servers, etc." (Sun
Microsystems)
"What is the difference between a Java application
server and servlets ? Servlets have been used
generically to refer to any server-side Java application code, but
servlets have come to mean HTTP Servlets ---the Java
industry standard for dispatching to server-side Java in HTTP and
for returning HTML responses. A Java application server ,
however, supports Java application partitioning, wherein a Java
application interconnects with another Java application over the
network. So the Java industry defines a standard Java
application server is an integrated server that supports the
range of Java Enterprise APIs." (WebLogic)
"What is a servlet engine ? A servlet engine
provides a portable, Java servlet-based execution environment that
turns Web application servers into Java-enabled Web application
servers. It's the state-of-the art, easy-to-use, and extensible
way of deploying and managing Web applications across your
enterprise networks. A servlet engine is the nucleus of a
scalable Web application platform." (IBM)
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