Distributed Objects & Components: 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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