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Questions and Answers
What is the primary reason for using a proxy to control access to an object?
What is the primary reason for using a proxy to control access to an object?
- To reduce the object's memory footprint
- To improve the object's performance
- To provide a level of abstraction for the object's clients
- To delay the object's initialization until it's actually needed (correct)
What is a potential drawback of directly implementing deferred initialization code in an object's class?
What is a potential drawback of directly implementing deferred initialization code in an object's class?
- It can reduce the object's performance
- It may limit the object's functionality
- It may lead to code duplication (correct)
- It can make the object more difficult to maintain
What is the benefit of using a proxy to control access to an object, in terms of code maintenance?
What is the benefit of using a proxy to control access to an object, in terms of code maintenance?
- It eliminates the need for deferred initialization code
- It reduces the object's complexity
- It allows for code duplication
- It enables the separation of concerns, reducing maintenance efforts (correct)
What type of object is a prime candidate for using a proxy to control access?
What type of object is a prime candidate for using a proxy to control access?
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What is a scenario where you might not be able to implement deferred initialization code directly in an object's class?
What is a scenario where you might not be able to implement deferred initialization code directly in an object's class?
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Study Notes
Proxy Design Pattern
- Proxy is a structural design pattern that provides a substitute or placeholder for another object.
- A proxy controls access to the original object, allowing you to perform actions before or after the request reaches the original object.
Problem and Motivation
- The need to control access to an object arises when it consumes a vast amount of system resources.
- Example: a massive object that is needed only occasionally.
- Lazy initialization can be implemented to create the object only when it's needed.
- However, this approach can lead to code duplication, as all clients would need to execute deferred initialization code.
Limitations
- In some cases, it's not possible to put the deferred initialization code directly into the object's class, such as when the class is part of a closed 3rd-party library.
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