Lecture 1A

Question 1

What does ORM stand for?

Answer 1

Object relational mapping.

Question 2

Four goals enterprise software needs to meet?

Answer 2

Extensibility
Portability
Reliability
Security

Question 3

Expand on extensibility:

Answer 3

Adding functionality should be easy.
Code should be reusable.
How: separation of concerns via modularization, encapsulation, tiers.

Question 4

Expand o portability and interoperability:

Answer 4

Should not depend on single number of technology vendors.

How: use of portable frameworks, standardized approaches, open source.

Question 5

Expand on reliability and scalability:

Answer 5

How: distributed computing and parallelism - concurrency, ideally non-blocking / asynchronous. Also use of application server hitch provides high availability.

Question 6

Expand on security:

Answer 6

How: Authentication, Authorization, permission and roles, cryptography, logging.

Question 7

What use Java for enterprise?

Answer 7

Widely used, fast virtual machine (JVM), lots of libraries, secure future.

Question 8

Downsides of Java for enterprise?

Answer 8

Many product decisions to make, available frameworks verbose, Java 1.7 behind regards parallel and multi-threaded, can be overkill for small size businesses.

Question 9

Main enterprise architectural feature?

Answer 9

Multi-tier or n-tier architecture.

Question 10

What organize as tiers?

Answer 10

Separation of concerns, scalability, security, extensibility and maintainibility. Same reasons we split programs into modules, packages, classes, libraries.

Question 11

Typical tiers:

Answer 11

Client (presentation)
Web tier (optional)
Business tier (application, business logic and beans)
Data tier (enterprise information tier)

Question 12

Client tier:

Answer 12

Presentation layer, typically multiple clients, receives user input, html,

Question 13

Web tier:

Answer 13

Interface between client tier and business tier, supplies client with content, collects input from client, JSP, servlets

Question 14

Business tier:

Answer 14

Business logic, enterprise Java beans, JNDI

Question 15

Data tier:

Answer 15

Relational database management system or NoSQL, hibernate or other ORMs, JDBC, Java Persistence API and Java Transaction API

Question 16

What is Java EE

Answer 16

Java Enterprise Edition, a bundle of technologies for developing enterprise apps, based on JVM, also require knowledge of html, xml, SQL.

Question 17

What is enterprise software?

Answer 17

Large scale multi-component software aimed at organizations. Typically: client-server arch, multi-threaded and parallel, multiple tiers, database, security, scalability.