Lecture 11

Question 1

What is Java Enterprise for?

Answer 1

large-scale, multi-tiered, scalable, reliable, and secure network applications

Question 2

What are the two targets of Java Enterprise?

Answer 2

• Large web applications

- Applications for corporations, governments, large institutions

Question 3

How does the Java Enterprise architecture happen?

Answer 3

By a voting committee of industry experts.

Question 4

What are some technical perspectives when considering an enterprise system?

Answer 4

• Component technologies
• Distributed computing
• Framework design
• Security

Question 5

What are the benefits of Java EE?

Answer 5

• Scalability
• Robustness
• Reuse
• Separation of Concerns
• Flexibility

Question 6

What is the façade patter?

Answer 6

A façade is an object that provides a simplified interface to a larger body of code

Question 7

What does ACID stand for?

Answer 7

• Atomicity
• Consistency
• Isolation
• Durability

Question 8

What is ‘Atomicity’ in ACID?

Answer 8

• Comprise a single unit of work

* Not complete unless all operations complete successfully

Question 9

What is ‘Consistency’ in ACID?

Answer 9

• Semantic and referential integrity of data preserved after transaction
• Can be a case for aborting transaction

Question 10

What is ‘Isolation’ in ACID?

Answer 10

• Operations invisible until transaction completed

* Concurrent transactions same as some serial ordering

Question 11

What is ‘Durability’ in ACID?

Answer 11

• A completed transaction is permanent

* Possibly undone by a “compensating transaction”